https://onelinestudio.us/blog/ Plain-English articles on solar permits, NEC code, rapid shutdown, system sizing and getting a residential PV/ESS design approved the first time. en-us Wed, 29 Jul 2026 03:29:34 GMT https://onelinestudio.us/blog/how-to-size-a-residential-solar-system.html https://onelinestudio.us/blog/how-to-size-a-residential-solar-system.html A simple, honest method to size a home solar system from your electricity bill — the annual-kWh formula, peak sun hours by region, how many panels you need, offset percentage and battery basics. Tue, 28 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-12-rapid-shutdown-explained.html https://onelinestudio.us/blog/nec-690-12-rapid-shutdown-explained.html What NEC 690.12 rapid shutdown actually requires — the array-boundary and controlled-conductor limits, module-level vs array-level, how the 2017, 2020 and 2023 editions differ, and how to comply with microinverters, optimizers or a listed PVRSS. Tue, 28 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/string-vs-central-inverter.html https://onelinestudio.us/blog/string-vs-central-inverter.html How string inverters and central inverters differ in scale, wiring, and redundancy, and why residential solar uses strings while large commercial arrays use central units. Tue, 28 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-in-a-solar-permit-set.html https://onelinestudio.us/blog/what-is-in-a-solar-permit-set.html A sheet-by-sheet checklist of a complete residential solar + battery permit set — cover sheet, site/plot plan, structural, three-line diagram, labels, load calc, interconnection and manufacturer datasheets — and what each one has to show. Tue, 28 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/why-solar-permits-get-rejected.html https://onelinestudio.us/blog/why-solar-permits-get-rejected.html The 8 most common reasons a residential solar permit gets kicked back at plan check — rapid shutdown, the 120% busbar rule, string voltage, conductor sizing, grounding, site plans, datasheets and labels — and how to clear each one. Tue, 28 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-consumption-monitoring-cts.html https://onelinestudio.us/blog/solar-consumption-monitoring-cts.html How current transformers (CTs) enable whole-home solar consumption monitoring, what production-versus-consumption data reveals, and where CTs clamp in the panel. Mon, 27 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/surge-protection-spd-for-solar.html https://onelinestudio.us/blog/surge-protection-spd-for-solar.html What surge protective devices do in a solar system, the difference between Type 1 and Type 2 SPDs, and where they belong on the AC and DC sides of the array. Sun, 26 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/transfer-switches-for-solar-ats-mts.html https://onelinestudio.us/blog/transfer-switches-for-solar-ats-mts.html How automatic and manual transfer switches work in solar-plus-storage systems, why they prevent backfeeding the grid, and where each type is used in a backup design. Sat, 25 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/bifacial-solar-panels-explained.html https://onelinestudio.us/blog/bifacial-solar-panels-explained.html How bifacial solar panels capture light on both sides, how albedo and mounting height drive rear-side gain, and what bifaciality means for residential rooftop use. Fri, 24 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/how-solar-rapid-shutdown-protects-firefighters.html https://onelinestudio.us/blog/how-solar-rapid-shutdown-protects-firefighters.html Solar rapid shutdown exists to keep firefighters safe on a burning roof. Learn why NEC 690.12 requires it and how it de-energizes rooftop wiring fast. Fri, 24 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-meters-production-vs-net.html https://onelinestudio.us/blog/solar-meters-production-vs-net.html What a production meter measures versus a bidirectional net meter, why utilities use each, and how they show up on a residential solar interconnection. Fri, 24 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-roof-attachments-and-flashing.html https://onelinestudio.us/blog/solar-roof-attachments-and-flashing.html How solar roof attachments waterproof penetrations with flashing, why lag screws must hit the rafter, and how attachment spacing carries wind and snow loads. Thu, 23 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-a-200-amp-service.html https://onelinestudio.us/blog/what-is-a-200-amp-service.html Your electrical service size shapes how much solar your panel can accept. Learn what a 200-amp service is and how the NEC busbar rule limits solar. Thu, 23 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-a-smart-electrical-panel.html https://onelinestudio.us/blog/what-is-a-smart-electrical-panel.html How smart electrical panels like SPAN and Lumin manage circuit-level loads, enable partial-home backup with less battery, and where they fit in a solar-plus-storage design. Thu, 23 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-conductor-types-pv-wire-thwn.html https://onelinestudio.us/blog/solar-conductor-types-pv-wire-thwn.html Where PV Wire, THWN-2, and USE-2 conductors are used in a residential solar install, how their ratings differ, and why exposed DC runs need sunlight-rated wire. Wed, 22 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-panel-degradation-and-warranties.html https://onelinestudio.us/blog/solar-panel-degradation-and-warranties.html Solar panels slowly lose output over time. Learn what degradation rates mean and how product warranties differ from performance warranties before you buy. Wed, 22 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-racking-systems-explained.html https://onelinestudio.us/blog/solar-racking-systems-explained.html How rail-based and rail-less solar racking systems differ, the roof attachments they use, and why UL 2703 listing and the flush-mount design matter for permits. Wed, 22 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/reading-a-solar-proposal.html https://onelinestudio.us/blog/reading-a-solar-proposal.html A solar proposal is full of numbers that hide big assumptions. Learn how to check system size, equipment, and production estimates before you sign. Tue, 21 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-a-microinverter.html https://onelinestudio.us/blog/what-is-a-microinverter.html How microinverters convert DC to AC at each module, why that satisfies rapid shutdown, and the practical pros and cons versus a central string inverter. Tue, 21 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-a-power-optimizer.html https://onelinestudio.us/blog/what-is-a-power-optimizer.html How DC power optimizers work as module-level power electronics (MLPE), why they improve output under shade and mismatch, and how they support rapid shutdown. Tue, 21 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-monitoring-explained.html https://onelinestudio.us/blog/solar-monitoring-explained.html Solar monitoring shows how your system performs day to day. Learn the difference between production and consumption monitoring and what alerts really matter. Mon, 20 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/temperature-coefficient-solar-panels.html https://onelinestudio.us/blog/temperature-coefficient-solar-panels.html Why hot solar panels lose output, how the temperature coefficient of power and Voc work, and why the Voc side drives cold-weather string sizing under the NEC. Mon, 20 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/ul-1741-and-1741-sb-explained.html https://onelinestudio.us/blog/ul-1741-and-1741-sb-explained.html What UL 1741 certifies for grid-tied solar inverters, how the SB supplement adds grid-support functions and IEEE 1547-2018 compliance, and why utilities require it. Mon, 20 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-and-heat-pumps-electrification.html https://onelinestudio.us/blog/solar-and-heat-pumps-electrification.html Electrifying your home with heat pumps and EVs raises your electric load. Learn how to size solar for a bigger all-electric future and plan your panel. Sun, 19 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-panel-efficiency-explained.html https://onelinestudio.us/blog/solar-panel-efficiency-explained.html What solar panel efficiency actually measures, why higher efficiency matters most on tight roofs, and how to read the efficiency number on a module datasheet. Sun, 19 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/ul-9540-and-9540a-explained.html https://onelinestudio.us/blog/ul-9540-and-9540a-explained.html What UL 9540 and UL 9540A certify for energy storage systems, how the two differ, and why AHJs and fire codes require them for residential solar batteries. Sun, 19 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/lfp-vs-nmc-solar-batteries.html https://onelinestudio.us/blog/lfp-vs-nmc-solar-batteries.html How LFP (lithium iron phosphate) and NMC solar battery chemistries compare on safety, thermal behavior, cycle life, and energy density for residential energy storage. Sat, 18 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-net-metering-for-homeowners.html https://onelinestudio.us/blog/solar-net-metering-for-homeowners.html Understand how solar net metering works, how credits and true-up settlements are calculated, and why NEM rules keep changing across the United States. Sat, 18 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/adding-a-battery-to-existing-solar.html https://onelinestudio.us/blog/adding-a-battery-to-existing-solar.html Thinking about adding storage to solar you already own? Learn how AC-coupling works, what a retrofit involves, and how it affects your permit and design. Fri, 17 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-a-hybrid-inverter.html https://onelinestudio.us/blog/what-is-a-hybrid-inverter.html How a hybrid solar inverter combines PV conversion, battery charging, and backup in one unit — plus how it differs from string, micro, and AC-coupled battery setups. Fri, 17 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/n-type-vs-p-type-solar-cells.html https://onelinestudio.us/blog/n-type-vs-p-type-solar-cells.html How N-type and P-type solar cells differ in light-induced degradation, temperature coefficient, efficiency, and long-term output — a factual equipment guide for residential PV. Thu, 16 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-battery-backup-for-homeowners.html https://onelinestudio.us/blog/solar-battery-backup-for-homeowners.html Learn how solar battery backup really works, the difference between whole-home and partial backup, and what it takes to keep the lights on during an outage. Thu, 16 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/do-solar-panels-work-in-cold-weather.html https://onelinestudio.us/blog/do-solar-panels-work-in-cold-weather.html Cold weather does not stop solar panels. It can boost efficiency, but freezing temperatures raise voltage in ways your solar design has to account for. Wed, 15 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-panel-types-explained.html https://onelinestudio.us/blog/solar-panel-types-explained.html How monocrystalline, polycrystalline, and thin-film solar panels differ in efficiency, temperature behavior, appearance, and typical residential use — a plain-English equipment guide. Wed, 15 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-happens-to-solar-during-an-outage.html https://onelinestudio.us/blog/what-happens-to-solar-during-an-outage.html Why grid-tied solar shuts off in a blackout, the safety reason behind it, and what backup actually requires — batteries, hybrid inverters, and critical-load panels. Tue, 14 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/homeowners-guide-to-solar-permits.html https://onelinestudio.us/blog/homeowners-guide-to-solar-permits.html What to expect from the solar permit process start to finish — the plan set, submission, plan review, inspections, utility interconnection, and how to avoid rejections. Mon, 13 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-size-solar-system-do-i-need.html https://onelinestudio.us/blog/what-size-solar-system-do-i-need.html A homeowner's walkthrough to sizing a solar system — from your annual kWh to kilowatts and panel count, plus how sun hours, offset goals and roof space shape the answer. Sun, 12 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-and-your-electrical-panel.html https://onelinestudio.us/blog/solar-and-your-electrical-panel.html The 120% rule explained for homeowners — how solar connects to your electrical panel, why busbar capacity matters, and the options if your panel is too small. Sat, 11 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/expedited-solar-permitting-explained.html https://onelinestudio.us/blog/expedited-solar-permitting-explained.html How expedited solar permitting works, from the California solar permitting guidebook to SolarAPP+ automated approvals and over-the-counter review for standard systems. Fri, 10 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/is-my-roof-good-for-solar.html https://onelinestudio.us/blog/is-my-roof-good-for-solar.html How to tell if your roof suits solar — orientation, tilt, shading, condition and age, and how much usable space you really have after setbacks and obstructions. Fri, 10 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-read-your-electric-bill-for-solar.html https://onelinestudio.us/blog/how-to-read-your-electric-bill-for-solar.html How to read your electric bill before going solar — find your kWh usage, understand your rate, spot demand charges and fees, and pull the numbers that size a solar system. Thu, 09 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-permit-checklist-for-installers.html https://onelinestudio.us/blog/solar-permit-checklist-for-installers.html A sheet-by-sheet solar permit submittal checklist for installers, covering the complete plan set, datasheets, and application items AHJs expect on first submittal. Thu, 09 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/common-solar-structural-corrections.html https://onelinestudio.us/blog/common-solar-structural-corrections.html The most common structural corrections on a residential solar permit, from attachment spacing and rafter capacity to wind and snow loads, and how to fix each one. Wed, 08 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/off-grid-vs-grid-tied-solar.html https://onelinestudio.us/blog/off-grid-vs-grid-tied-solar.html Off-grid versus grid-tied solar for a home — how each works, the real cost and reliability differences, when off-grid makes sense, and why most homeowners choose grid-tied. Wed, 08 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/common-solar-electrical-corrections.html https://onelinestudio.us/blog/common-solar-electrical-corrections.html The most common electrical corrections a residential solar permit gets at plan check, from busbar and conductor sizing to rapid shutdown and grounding, and how to fix each. Tue, 07 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/do-i-need-a-battery-with-solar.html https://onelinestudio.us/blog/do-i-need-a-battery-with-solar.html Whether you need a solar battery — backup power versus bill offset, when a battery actually pays off, rough sizing for essentials, and the honest trade-offs for homeowners. Tue, 07 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/can-i-install-solar-myself.html https://onelinestudio.us/blog/can-i-install-solar-myself.html An honest look at DIY solar — what a homeowner can legally do, what needs a licensed electrician or PE, the permit and code hurdles, and where DIY effort actually pays off. Mon, 06 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-as-built-drawings.html https://onelinestudio.us/blog/solar-as-built-drawings.html What solar as-built drawings are, when an AHJ or utility requires them, and how they differ from the original permit set that was submitted for approval. Mon, 06 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/how-many-solar-panels-to-power-a-house.html https://onelinestudio.us/blog/how-many-solar-panels-to-power-a-house.html How many solar panels a home needs, worked from your annual kWh and panel wattage — a simple formula, a real example, roof-space check, and what to know before you buy. Sun, 05 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-submit-a-solar-permit.html https://onelinestudio.us/blog/how-to-submit-a-solar-permit.html A step-by-step guide to submitting a residential solar permit, whether through an online portal or at the counter, and what goes in the submittal package. Sun, 05 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-an-ahj.html https://onelinestudio.us/blog/what-is-an-ahj.html What an AHJ is, who enforces electrical and building code on a solar project, and why code adoption and local amendments vary so much between jurisdictions. Sat, 04 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/net-metering-explained.html https://onelinestudio.us/blog/net-metering-explained.html How net metering credits your solar production against your electric bill, why the rules vary by state and utility, and what NEM 3.0-style changes mean. Fri, 03 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/utility-interconnection-requirements.html https://onelinestudio.us/blog/utility-interconnection-requirements.html What utilities require to connect a residential solar system to the grid: export limits, listed equipment, meters, disconnects, and the interconnection application. Thu, 02 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/what-inspectors-check-on-solar.html https://onelinestudio.us/blog/what-inspectors-check-on-solar.html A field guide to what a building and electrical inspector actually looks at during rough and final solar inspections, and how to pass on the first visit. Wed, 01 Jul 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-prepare-for-a-solar-inspection.html https://onelinestudio.us/blog/how-to-prepare-for-a-solar-inspection.html A solar inspection verifies your install matches the approved permit. Learn what the rough and final inspections check and how to pass on the first visit. Tue, 30 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/residential-vs-commercial-solar-permits.html https://onelinestudio.us/blog/residential-vs-commercial-solar-permits.html Residential and commercial solar permits differ in review depth, structural rules, electrical thresholds, and fire code. Here's how the two compare. Mon, 29 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/do-i-need-a-permit-for-solar.html https://onelinestudio.us/blog/do-i-need-a-permit-for-solar.html Almost every grid-tied residential solar system needs a building permit and utility approval. Learn why permits are required and what the process involves. Sun, 28 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-long-does-a-solar-permit-take.html https://onelinestudio.us/blog/how-long-does-a-solar-permit-take.html Solar permit timelines range from same-day to several weeks depending on your AHJ, the queue, and how clean your design is. Here's what drives the wait. Sat, 27 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/fire-setbacks-rooftop-solar-ifc-605.html https://onelinestudio.us/blog/fire-setbacks-rooftop-solar-ifc-605.html IFC 605 sets fire access pathways and ridge setbacks for rooftop solar so firefighters can work safely. Learn the layout rules and how to show them. Fri, 26 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-structural-review-explained.html https://onelinestudio.us/blog/solar-structural-review-explained.html Solar structural review checks that your roof can carry the array. Learn about dead load, attachment spacing, uplift, and when a PE stamp is required. Thu, 25 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-pto-permission-to-operate.html https://onelinestudio.us/blog/what-is-pto-permission-to-operate.html PTO, or permission to operate, is the utility's final sign-off that lets you legally turn on a grid-tied solar system. Here's what it is and how to get it. Wed, 24 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-interconnection-application-explained.html https://onelinestudio.us/blog/solar-interconnection-application-explained.html The interconnection application is how your utility approves a grid-tied solar system. Learn the forms, export vs non-export, and how it fits with permitting. Tue, 23 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-read-a-plan-check-correction.html https://onelinestudio.us/blog/how-to-read-a-plan-check-correction.html A plan-check correction letter lists exactly what to fix before your solar permit is approved. Learn how to decode each item and respond fast. Mon, 22 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-solarapp-plus.html https://onelinestudio.us/blog/what-is-solarapp-plus.html SolarAPP+ is an automated online tool that issues residential solar permits instantly when a system meets code. Here's how it works and who's eligible. Sun, 21 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/generator-and-solar-interconnection.html https://onelinestudio.us/blog/generator-and-solar-interconnection.html How generators and solar coexist safely — the role of automatic and manual transfer switches, hybrid inverters, and the code rules that keep the two sources apart. Sat, 20 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/ev-charger-solar-load-management.html https://onelinestudio.us/blog/ev-charger-solar-load-management.html How adding an EV charger interacts with solar interconnection under NEC 705.12, when your service panel is the limit, and how load-management devices avoid a costly upgrade. Fri, 19 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/critical-loads-panel-explained.html https://onelinestudio.us/blog/critical-loads-panel-explained.html What a critical-loads panel is, how partial-home battery backup works, how to pick which circuits to protect, and where the subpanel fits in a solar-plus-storage design. Thu, 18 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/estimating-solar-production-kwh.html https://onelinestudio.us/blog/estimating-solar-production-kwh.html A simple, honest method to estimate annual solar production in kWh using peak sun hours and a system derate factor, plus what each loss in the derate actually represents. Wed, 17 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/dc-vs-ac-disconnects-solar.html https://onelinestudio.us/blog/dc-vs-ac-disconnects-solar.html Understand DC vs AC disconnects in a residential solar system — where each one goes, how they are rated, why load-break matters, and what an AHJ expects to see. Tue, 16 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/what-is-a-solar-combiner-box.html https://onelinestudio.us/blog/what-is-a-solar-combiner-box.html Learn what a solar combiner box does, how source-circuit fusing protects PV strings, and when a residential system actually needs one versus when it can be skipped. Mon, 15 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-choose-a-solar-inverter.html https://onelinestudio.us/blog/how-to-choose-a-solar-inverter.html Compare string, micro, and hybrid inverters, learn what the DC-to-AC ratio means, and see which features matter for a residential solar system that will pass permitting. Sun, 14 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/solar-panel-tilt-and-azimuth.html https://onelinestudio.us/blog/solar-panel-tilt-and-azimuth.html A plain-English guide to solar panel tilt and azimuth — how orientation and angle change annual yield, why true south and latitude-tilt are rules of thumb, not laws. Sat, 13 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/shading-and-solar-production.html https://onelinestudio.us/blog/shading-and-solar-production.html Understand how shade cuts solar output, why a single shaded cell drags a whole string, and how module-level electronics like microinverters and optimizers limit the loss. Fri, 12 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-calculate-solar-offset.html https://onelinestudio.us/blog/how-to-calculate-solar-offset.html Learn how to calculate solar offset by comparing annual PV production to annual home usage, why 100% offset isn't always the goal, and how utility and AHJ rules shape it. Thu, 11 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/rapid-shutdown-devices-compared.html https://onelinestudio.us/blog/rapid-shutdown-devices-compared.html Compare the ways to meet NEC 690.12 rapid shutdown — microinverters, DC optimizers, and listed PVRSS — on how each de-energizes the array, monitoring, and best-fit design. Wed, 10 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/roof-mount-vs-ground-mount-solar.html https://onelinestudio.us/blog/roof-mount-vs-ground-mount-solar.html Compare roof-mount and ground-mount solar on the things that drive design and permitting — fire setbacks, rapid shutdown, structural loads, wiring runs, and cost. Tue, 09 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/grounding-and-bonding-a-pv-system.html https://onelinestudio.us/blog/grounding-and-bonding-a-pv-system.html A practical guide to grounding and bonding a residential PV system — the grounding electrode, GEC, equipment grounding conductors, and array bonding under NEC 690 and 250. Mon, 08 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/sizing-solar-conductors-and-breakers.html https://onelinestudio.us/blog/sizing-solar-conductors-and-breakers.html A worked NEC example for sizing PV conductors and breakers — from 690.8 maximum currents through 310.16 ampacity and temperature and fill corrections to the right OCPD. Sun, 07 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-read-a-solar-one-line-diagram.html https://onelinestudio.us/blog/how-to-read-a-solar-one-line-diagram.html Learn to read a residential solar one-line diagram — array, inverter, conductors, disconnects, overcurrent protection, and the point of interconnection, symbol by symbol. Sat, 06 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/main-panel-upgrade-vs-supply-side-tap.html https://onelinestudio.us/blog/main-panel-upgrade-vs-supply-side-tap.html When solar overloads your busbar, you choose between a main panel upgrade, a lower main breaker, or a supply-side tap. Here is the 120% busbar rule decision, worked plainly. Fri, 05 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/dc-coupled-vs-ac-coupled-storage.html https://onelinestudio.us/blog/dc-coupled-vs-ac-coupled-storage.html Understand DC-coupled versus AC-coupled solar battery storage — how each wires in, round-trip efficiency, retrofit versus new build, and which fits your inverter and roof. Thu, 04 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-size-a-solar-battery-backup.html https://onelinestudio.us/blog/how-to-size-a-solar-battery-backup.html Size a home solar battery for backup the right way — pick critical loads, estimate kWh per day, choose days of autonomy, and account for depth of discharge and inverter limits. Wed, 03 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/microinverters-vs-string-vs-optimizers.html https://onelinestudio.us/blog/microinverters-vs-string-vs-optimizers.html Compare the three residential solar inverter architectures — microinverters, string inverters, and DC optimizers — on rapid shutdown, shade tolerance, cost, and best-fit use cases. Tue, 02 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/how-to-size-pv-strings-step-by-step.html https://onelinestudio.us/blog/how-to-size-pv-strings-step-by-step.html A worked NEC 690.7 method for sizing PV strings — max modules per string from cold-weather Voc, min modules from hot-weather Vmp, staying inside the inverter MPPT window. Mon, 01 Jun 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-13-pv-system-disconnect.html https://onelinestudio.us/blog/nec-690-13-pv-system-disconnect.html NEC 690.13 requires a PV system disconnect that opens all conductors from the array. Learn where it goes, the 690.13(B) marking, and how it differs from rapid shutdown. Sun, 31 May 2026 12:00:00 GMT https://onelinestudio.us/blog/three-ampacity-checks-pv-circuit.html https://onelinestudio.us/blog/three-ampacity-checks-pv-circuit.html Every PV conductor must clear three tests: the 690.8 minimum current, the temperature and conduit-fill derate, and the 110.14 termination cap. Here is the order to run them. Sat, 30 May 2026 12:00:00 GMT https://onelinestudio.us/blog/egc-vs-gec-difference-solar.html https://onelinestudio.us/blog/egc-vs-gec-difference-solar.html EGC vs GEC confuses many solar designers. Learn what each conductor does, how NEC 250.122 and 250.66 size them, and where each one lands in a PV install. Fri, 29 May 2026 12:00:00 GMT https://onelinestudio.us/blog/conductor-ampacity-derating-explained.html https://onelinestudio.us/blog/conductor-ampacity-derating-explained.html How to derate PV conductor ampacity for ambient temperature and conduit fill, then check the 110.14 termination rating. The two derates plus the terminal check, explained. Thu, 28 May 2026 12:00:00 GMT https://onelinestudio.us/blog/cold-temperature-voc-correction.html https://onelinestudio.us/blog/cold-temperature-voc-correction.html Why cold weather raises module Voc and how NEC 690.7 corrects for it. Learn the temperature-coefficient method, the ASHRAE low-temp input, and why it caps string length. Wed, 27 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-2017-vs-2020-solar-changes.html https://onelinestudio.us/blog/nec-2017-vs-2020-solar-changes.html The 2017-to-2020 NEC jump reshaped solar: module-level rapid shutdown, a reorganized Article 690, new Article 706 for storage, and clarified disconnect rules. Tue, 26 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-2020-vs-2023-solar-changes.html https://onelinestudio.us/blog/nec-2020-vs-2023-solar-changes.html What changed for PV and energy storage between the 2020 and 2023 NEC — Article 690 updates, the new 2023 emphasis, and the growing role of Article 706 for batteries. Mon, 25 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-56-solar-labels-placards.html https://onelinestudio.us/blog/nec-690-56-solar-labels-placards.html The labels a solar permit reviewer checks: NEC 690.56 rapid-shutdown and system markings plus the 705.10 directory. Learn required wording, placement, and durability. Sun, 24 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-250-4-grounding-bonding-basics.html https://onelinestudio.us/blog/nec-250-4-grounding-bonding-basics.html NEC 250.4 sets the goals of grounding and bonding. Learn the difference between grounded, grounding, and bonding conductors and why each matters in a PV install. Sat, 23 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-8-vs-690-9-currents-ocpd.html https://onelinestudio.us/blog/nec-690-8-vs-690-9-currents-ocpd.html NEC 690.8 sets PV circuit currents and conductor ampacity; 690.9 sizes the overcurrent device. See how the 1.25 factors stack to 156% and where each one applies. Fri, 22 May 2026 12:00:00 GMT https://onelinestudio.us/blog/voltage-drop-in-solar-circuits.html https://onelinestudio.us/blog/voltage-drop-in-solar-circuits.html Why voltage drop matters in PV circuits, how to calculate it on the AC and DC sides, why the 2 percent design target exists, and the Vmp basis for DC drop. Thu, 21 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-chapter-9-conduit-fill-solar.html https://onelinestudio.us/blog/nec-chapter-9-conduit-fill-solar.html How NEC Chapter 9 conduit fill works for solar — the 40% fill rule, counting the equipment grounding conductor, and a worked EMT example for a PV circuit. Wed, 20 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-110-14-termination-temperature.html https://onelinestudio.us/blog/nec-110-14-termination-temperature.html Why NEC 110.14(C) caps conductor ampacity at the 60C or 75C termination rating, how the 90C column is really used, and what it means for solar conductor sizing. Tue, 19 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-706-energy-storage-explained.html https://onelinestudio.us/blog/nec-706-energy-storage-explained.html What NEC Article 706 requires for residential battery energy storage: disconnecting means, listing, working space, and how ESS ties into the PV interconnect. Mon, 18 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-705-30-interconnection-overcurrent.html https://onelinestudio.us/blog/nec-705-30-interconnection-overcurrent.html How NEC 705.30 sets overcurrent protection for PV interconnection conductors, the 125% continuous-output basis, and how it works with the 705.12 busbar rule. Sun, 17 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-705-11-supply-side-connection.html https://onelinestudio.us/blog/nec-705-11-supply-side-connection.html When to use a NEC 705.11 supply-side connection instead of a load-side backfeed, the conductor and fused-disconnect rules, and how it avoids the 120% rule. Sat, 16 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-47-pv-grounding-electrode.html https://onelinestudio.us/blog/nec-690-47-pv-grounding-electrode.html How NEC 690.47 handles PV grounding — bonding the array, the grounding electrode system, and when auxiliary electrodes are optional versus required by the AHJ. Fri, 15 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-31-pv-wiring-methods.html https://onelinestudio.us/blog/nec-690-31-pv-wiring-methods.html NEC 690.31 wiring methods for PV — PV Wire vs THWN-2, when conduit is required, the readily-accessible rule, and the marking that keeps a permit clean. Thu, 14 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-15-pv-disconnecting-means.html https://onelinestudio.us/blog/nec-690-15-pv-disconnecting-means.html How NEC 690.15 governs PV disconnecting means — ratings, load-break capability, grouping, and where the disconnect must be located so a reviewer approves it. Wed, 13 May 2026 12:00:00 GMT https://onelinestudio.us/blog/nec-690-11-dc-arc-fault-explained.html https://onelinestudio.us/blog/nec-690-11-dc-arc-fault-explained.html What NEC 690.11 DC arc-fault protection requires on PV, which circuits need AFCI, and how microinverters and optimizers change where the detection lives. Tue, 12 May 2026 12:00:00 GMT