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 17 of 19
Money
Schemes, instalments, loans — what can I actually get?
US IRS 26 USC 48 Energy Property and Investment Credit Election Guide
Understand the US IRS 26 USC 48 Energy Credit, including the 30% ITC, 5kWh storage minimum, 5MW interconnection limit, and election process.
US IRS 26 USC 48E Clean Electricity Investment Credit Guide
Guide to IRS 26 USC 48E Clean Electricity Investment Credit: 6% base vs 30% bonus rates, zero-emission standards, and 10% domestic content adders.
US IRS Notice 2023-29 Energy Community Bonus Credit Guide
Understand IRS Notice 2023-29 for the Energy Community Bonus Credit. Learn qualification criteria for brownfield, statistical, and coal closure areas to clai...
US IRS Notice 2023-38: Domestic Content Bonus Credit Guide
Understand IRS Notice 2023-38 for the Domestic Content Bonus Credit, including 100% steel/iron and 40-55% manufactured product rules.
US PURPA 18 CFR 292 Qualifying Facility Solar Purchase Rules Guide
Understand US PURPA 18 CFR 292 rules for solar qualifying facilities, including utility purchase obligations and avoided cost rates (August 2026).
US PURPA 18 CFR 292 Solar Interconnection and Backup Rates Guide
This guide details US PURPA 18 CFR 292 regulations for solar qualifying facility interconnection, parallel operation, and backup power rates (August 2026).
US PURPA 18 CFR 292.601: Qualifying Facility Regulatory Exemptions Guide
Understand US PURPA 18 CFR 292.601 and 292.602 exemptions for solar QFs from Federal Power Act, PUHCA 2005, and state utility laws (August 2026).
USDA REAP 7 CFR § 4280.117: Technical Merit Determination Guide
Compliance guide for USDA REAP 7 CFR § 4280.117 (August 2026). Master project cost tiers, technical reports, and pass/conditional/fail ratings.
USDA REAP 7 CFR § 4280.118: Large Solar Grant Application Guide
Compliance guide for USDA REAP 7 CFR § 4280.118 (August 2026). Master large solar grant applications ($200k+), technical reports, and feasibility studies.
USDA REAP 7 CFR 4280.115: Grant Funding and Cost-Share Limits
Compliance guide for USDA REAP 7 CFR 4280.115 (August 2026). Master federal solar grant limits, 25% cost-share, third-party equity, and eligible costs.
USDA REAP 7 CFR 4280.121: Grant Application Scoring Criteria
Compliance guide for USDA REAP 7 CFR 4280.121 (August 2026). Master the 100-point federal grant rubric, BTU yield per dollar, and solar sizing rules.
Used EV Battery Health: How to Check Before You Buy
A used EV's pack health is checkable in an afternoon: the car's readouts, charged range against original EPA, an OBD scan, and the warranty behind it all.
Utah Rocky Mountain Power Schedule 136 Export Credit Guide
Understand how Rocky Mountain Power Schedule 136 structures hourly export netting under UPSC Docket No. 17-035-61 and Section 25D tax credit rules.
Utah Rocky Mountain Power Schedule 137 Net Billing Guide
Utah PSC Rocky Mountain Power Schedule 137 net billing export credit rates (transitional tariff), 15-minute netting, and annual March expiration.
Utah Rocky Mountain Power Solar Interconnection Guide
Rocky Mountain Power Utah Level 1 and Level 2 interconnection technical requirements, accessible external AC disconnect, and net meter swap.
Utah Rooftop Solar Fire Setbacks And Permitting Guide
Learn Utah rooftop solar permitting requirements, including IFC 2021 Section 1205 fire setbacks, NEC 690.12 rapid shutdown, and AHJ inspection steps.
Vermont Green Mountain Power (GMP) Solar Interconnection: Rule 5.500 Screens, Timelines and Fees
GMP solar interconnection under Vermont PUC Rule 5.500: the 15 kW export screen, day-15 and day-31 deadlines, and the $37/kW TGFOV fee (September 2026).
Vermont PUC Rule 5100 Net Metering And Adjusters Guide
Understand how Vermont PUC Rule 5.100 structures blended rate net metering credits, siting and REC adjusters, and CPG registration requirements.
Victron and Panasonic DCB-105 Battery Compatibility and Setup Guide
Victron compatibility and configuration settings.
Victron and Pylontech Battery Compatibility Guide
Victron VE.Bus and VE.Can network configuration settings.
Victron BSLBATT LiFePO4 Battery CAN-Bus Setup Guide
Configure your Victron inverter/charger with BSLBATT LiFePO4 batteries using CAN-bus. Learn required settings for VEConfigure and ESS.
Victron BYD Battery Compatibility: Setup Guide and Firmware Requirements
Victron VE.Bus and VE.Can network configuration settings.
Victron Discover Battery Compatibility Guide
Victron compatibility and configuration settings.
Victron Fronius AC Coupling: Microgrid Setup Guide
Learn how to AC couple Victron Multi/Quattro inverters with Fronius PV inverters for a stable microgrid. Configure settings for frequency shifting and ...