Guides — United States
Every guide answers its question in the first two sentences, dates every price, and names every source. 434 published, grouped into the questions buyers actually ask.
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Start with your question
What should I buy, and how do I not get cheated?
29 guides
FixesWhy is my inverter beeping?
5 guides
SystemsHow do I size it, and what changed with net billing?
86 guides
ElectricShould I go electric, and what will it really cost per km?
21 guides
MoneySchemes, instalments, loans — what can I actually get?
288 guides
ReportsWhat do the numbers say?
5 guides
All guides — page 8 of 19
Money
Schemes, instalments, loans — what can I actually get?
California NEM 3.0 Net Billing Tariff: Rules for Solar Customers (August 2026)
Understand California's Net Billing Tariff (NEM 3.0) rules for solar customers, effective April 15, 2023. Learn about export compensation, battery sto
California Rule 21 Smart Inverter Interconnection Guide
Master California CPUC Rule 21 smart inverter interconnection. Learn UL 1741-SB mandates, Fast-Track review, Volt-Var grid response, and PTO requirements.
CAN Cows Graze Under Solar Panels? Agrivoltaics, Explained
Yes — solar grazing is a working industry: sheep are its stars, cattle need taller steel, crops share light by design. How farms stack two harvests.
Can Solar Run a Refrigerator? The Easiest Yes in Solar
A modern fridge sips 1-1.5 kWh a day, one panel's output, making it solar's easiest customer. The outage math and the compressor-start footnote.
Can Solar Run a Space Heater? Resistive Heat's Hard Math
A 1,500W space heater devours a panel's whole day in an hour — resistive heat is solar's worst customer. The heat-pump escape hatch, and winter's cruel timing.
Can Solar Run a Well Pump? Surge Is the Whole Story
A well pump's daily energy is tiny — its starting surge is the tyrant. Why grid-tied solar ignores it, why off-grid designs around it, and the soft-start fix.
Can Solar Run Your Air Conditioning? The Load That Decides
Central AC draws 3-5 kW and doubles a summer bill — and peaks exactly when panels produce. Grid-tied solar handles it; the panel math, the off-grid asterisk.
Can You Claim the Solar Tax Credit Twice? Final-Year Rules
The residential solar credit never had a lifetime limit: you could claim it every year you added equipment through 2025. Carryforwards and amended returns too.
Can Your HOA Block Solar Panels? Access Laws, Explained
Most states have solar access laws stopping HOAs from banning panels — but 'reasonable restrictions' on placement are the live fight. Your rights and theirs.
Clean Energy Tax Credits: Section 25D vs. Section 48 Guide
Compare Section 25D residential and Section 48 commercial clean energy tax credits. Learn 30% rates, prevailing wage rules, energy adders, and direct pay.
Colorado EV Tax Credit in 2026: What's Left and How It Works
Colorado's innovative motor vehicle credit dropped to $750 for 2026, with a $2,500 bonus under $35,000 MSRP. Amounts by year, eligibility, how to claim.
Colorado Net Metering Rules And Xcel Energy 200 Percent Sizing Guide
How do CPUC Rule 3664 and Xcel Energy tariffs allow 200% system sizing and 1:1 retail rate credits for residential solar in Colorado?
Colorado PUC Level 1, Level 2, and Level 3 Solar Interconnection Guide
Understand Colorado's PUC interconnection rules (4 CCR 723-3 Rule 3850 et seq.) for solar systems up to 10 MW, including Level 1 (25 kW-AC), Level 2 fast-tra...
Colorado Res Clean Energy Srecs And Rooftop Fire Code Setbacks Guide
How do IFC 2021 3-foot rooftop ridge setbacks, UL 1741-SB standards, and Colorado RES rules govern residential solar installations?
ComEd and Ameren Illinois Solar Net Metering Guide
Master ComEd and Ameren Illinois net metering. Learn 1:1 retail credits, DG smart inverter rebates, UL 1741-SB standards, and PTO approval steps.
Commercial Solar Tax Credit in 2026: The 48E Deadline Race
Section 48E still pays 30%+ for business solar, but only for projects in service by end-2027 or safely under construction. Deadlines, FEOC, the vacated notice.
Community Solar Explained: Solar Without a Roof
Subscribe to a share of an off-site array, take credits on your utility bill, own nothing. The answer for renters and shaded roofs — read the exit clause first.
Configuring Victron GX Devices for Exide Lithium Batteries
Victron compatibility and configuration settings.
Connecticut CHEAPR Rebate in 2026: Amounts and Adders
CHEAPR pays $1,000 on battery EVs and $500 on plug-in hybrids, with income-qualified adders on top. Connecticut's live program, minus the dealership gloss.
Connecticut Eversource And Ui Solar Interconnection Guide
How do Eversource and United Illuminating fast-track review rules, portal filings, and PTO approvals govern solar interconnection in Connecticut?
Connecticut Pura Residential Renewable Energy Solutions Rres Guide
How do Connecticut PURA RRES netting tariffs, buy-all sell-all options, and quarterly REC incentive payments compensate residential solar?
Delaware PSC Net Metering and Delmarva Power: Interconnection Guide
Understand Delaware's 26 DE Admin. Code 3012 net metering rules for Delmarva Power customers, including capacity limits, 110% sizing, and credit valua...
Delaware PSC Regulation 3008 Renewable Energy Portfolio Standard and SREC Guide
Delaware PSC Regulation 3008 guide covering RPS targets, SREC generation, PJM-EIS GATS tracking, compliance lifespans, and customer multipliers.
Do Solar Panels Damage Your Roof? The Honest Answer
Correctly installed panels protect the roof beneath them more than they threaten it. The failure mode is workmanship — what leaks, and how to contract for it.