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EGC Size Checker
Grounding screening per NEC 250.122; AHJ governs.
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Solar calculators
Sizing, production, cost, payback, batteries and incentives, each with the formula shown.
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Home Value Uplift Estimator
Resale premium via LBNL dollars per W; appraisal governs.
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ITC Carryforward Planner
Years to absorb credit from annual liability. See CPA.
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Panel Add-On Headroom Calculator
Extra panels allowed by inverter headroom.
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Degradation Year Picker
Output in any year from year-1 and rate.
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Inverter Loss Calculator
Yearly loss from CEC efficiency.
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Usage Benchmark vs US Average
Your usage vs EIA 877 kWh average.
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Heat Pump Solar Adder Calculator
Extra PV kWh and kW for heating load via COP.
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TOU Solar Value Calculator
Yearly solar value under flat vs TOU blended rate.
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Commercial Demand Savings Calculator
Yearly demand savings from coincident solar kW.
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