https://kilowattledger.docsanddeadlines.com Run the numbers on solar, batteries, and heat pumps before a salesperson does. en Sat, 03 Oct 2026 16:30:51 +0000 https://kilowattledger.docsanddeadlines.com/payback/solar-payback-without-federal-credit-inputs/ https://kilowattledger.docsanddeadlines.com/payback/solar-payback-without-federal-credit-inputs/ The credit was 30% of the sticker price and 58% of the amount you were actually earning back. Nine inputs, one formula, and a 7.7 kW roof carried to a year. Sun, 27 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/tariffs/residential-demand-charges-solar-payback/ https://kilowattledger.docsanddeadlines.com/tariffs/residential-demand-charges-solar-payback/ Georgia Power charges $12.44 for the highest 60-minute kW in any month, on-peak or not. Find that clause in your own tariff before you trust a payback figure. Sat, 26 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/solar/solar-tilt-azimuth-shade-kwh-cost/ https://kilowattledger.docsanddeadlines.com/solar/solar-tilt-azimuth-shade-kwh-cost/ A roof modeled at 225 degrees instead of 180 loses 657 kWh a year on paper alone. PVWatts numbers for azimuth, tilt, and shade, run on one roof, math shown. Fri, 25 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/payback/solar-loan-lease-ppa-cash-total-cost/ https://kilowattledger.docsanddeadlines.com/payback/solar-loan-lease-ppa-cash-total-cost/ One $24,000 roof, four contracts, 25 years. The year a 2.9% lease escalator overtakes your bill savings, and the numbers to copy from your own paperwork. Tue, 22 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/tariffs/solar-interconnection-application-tariff/ https://kilowattledger.docsanddeadlines.com/tariffs/solar-interconnection-application-tariff/ PG&E's Rule 21 runs 290 sheets and prices the same paperwork at $145 or $800 depending on one row. Find your utility's version and the clauses that bind it. Sun, 20 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/payback/solar-loan-dealer-fees-cash-price/ https://kilowattledger.docsanddeadlines.com/payback/solar-loan-dealer-fees-cash-price/ One system, $28,700 in cash or $38,818 financed. How a solar loan dealer fee hides outside the APR, and the payoff month where it stops costing you. Sat, 19 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/solar/solar-panel-removal-reinstall-roof-age/ https://kilowattledger.docsanddeadlines.com/solar/solar-panel-removal-reinstall-roof-age/ Contracts say 'competitive price' and cost guides disagree by 2x. Price a future removal and reinstall into payback, and find when to reroof first. Sat, 19 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/heatpump/cold-climate-heat-pump-cop-backup-heat/ https://kilowattledger.docsanddeadlines.com/heatpump/cold-climate-heat-pump-cop-backup-heat/ The 5 degree test point moved behind a paywall, the label HSPF2 was rated for a milder climate, and one thermostat setting multiplied backup kWh by six. Mon, 14 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/proposals/solar-production-guarantee-shortfall-payment/ https://kilowattledger.docsanddeadlines.com/proposals/solar-production-guarantee-shortfall-payment/ A filed 20-year contract pays $39.93 for a system running a fifth below its own estimate. Work out the deadband, the agreed price, and who reads the meter. Thu, 10 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/batteries/home-battery-installation-requirements-permit/ https://kilowattledger.docsanddeadlines.com/batteries/home-battery-installation-requirements-permit/ The room you picked has a kilowatt-hour ceiling written into the building code, and your quote never checked it. Read the section before you pay a deposit. Tue, 08 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/tariffs/nem-3-export-credits-hourly-california/ https://kilowattledger.docsanddeadlines.com/tariffs/nem-3-export-credits-hourly-california/ PG&E pays $0.00001 for a kilowatt-hour exported at 3 p.m. on a May weekend and $1.19289 at 7 p.m. on an August one. Same roof, same meter, one price sheet. Sat, 05 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/solar/microinverter-string-optimizer-roof/ https://kilowattledger.docsanddeadlines.com/solar/microinverter-string-optimizer-roof/ The 25-35% in microinverter pitches is a share of your shade loss, not extra output. NREL's testbed report, NEC 690.12, and the kWh math for one roof. Wed, 02 Sep 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/proposals/degradation-escalator-inflation-payback-dials/ https://kilowattledger.docsanddeadlines.com/proposals/degradation-escalator-inflation-payback-dials/ One $24,000 system, six defensible dial settings, paybacks from 8.3 to 11.3 years. Rebuild the three assumptions your proposal buried in fine print. Mon, 31 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/payback/pvwatts-by-hand-production-estimate/ https://kilowattledger.docsanddeadlines.com/payback/pvwatts-by-hand-production-estimate/ Five multiplications take a 7.2 kW roof from sunlight to 11,473 kWh a year. Run them on your address and see whether a quote's kWh was modelled or typed. Sun, 30 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/incentives/state-utility-rebate-funding-check/ https://kilowattledger.docsanddeadlines.com/incentives/state-utility-rebate-funding-check/ A rebate in a quote is a claim on someone else's budget. Trace it to a federal award, a charge on your bill, or an auction, then go check the balance. Sat, 29 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/heatpump/therms-to-kwh-heat-pump-operating-cost-worksheet/ https://kilowattledger.docsanddeadlines.com/heatpump/therms-to-kwh-heat-pump-operating-cost-worksheet/ A gas bill's therms are not all heating. Split them, convert at 29.31 kWh a therm, price them at your own block rate, and the answer arrives in dollars a year. Fri, 28 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/envelope/blower-door-ach50-cfm50-audit-report/ https://kilowattledger.docsanddeadlines.com/envelope/blower-door-ach50-cfm50-audit-report/ A blower door report shows two numbers and only one came off the gauge. What volume, the one-point 1.1 factor, and your climate zone do to the other. Sun, 23 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/tariffs/net-metering-net-billing-buy-all-sell-all/ https://kilowattledger.docsanddeadlines.com/tariffs/net-metering-net-billing-buy-all-sell-all/ One 8,000 kWh array on one Arizona tariff is worth $1,189, $763, or $778 a year depending only on which export structure the meter is wired for. Find yours. Sat, 22 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/solar/panel-inverter-warranty-three-layers/ https://kilowattledger.docsanddeadlines.com/solar/panel-inverter-warranty-three-layers/ The line that says 25-year warranty is three contracts signed by two companies. What each one pays for, and where each one lands when the installer folds. Sat, 22 Aug 2026 00:00:00 +0000 https://kilowattledger.docsanddeadlines.com/proposals/solar-proposal-12-required-items/ https://kilowattledger.docsanddeadlines.com/proposals/solar-proposal-12-required-items/ A proposal quoting 11,900 kWh from 8.40 kW claims 1,417 kWh per kW-DC. Twelve items decide whether that number survives contact with your own tariff sheet. Fri, 21 Aug 2026 00:00:00 +0000