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BTU to Tonnage Converter
Convert BTU/hr to tons of cooling and watts.
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Electrical calculators
Battery sizing, backup runtime, payback, plus solar, rates, circuits, and load, each with visible math.
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Solar Loan Payment Calculator
Monthly payment and interest for financed solar.
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Net Metering Bill Calculator
Monthly bill with imports, exports, and fixed fees.
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Solar String Voltage Calculator
String voltage at STC and on cold mornings.
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Solar Panel Tilt Angle Calculator
Best fixed and seasonal tilt for your latitude.
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Solar Panel Cost Calculator
Gross, credit, and net cost of a solar install.
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Solar Panel Output Calculator
Real daily and yearly energy from one panel.
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Solar Energy Production Calculator
Daily, monthly, and yearly kWh your array will produce.
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Battery Cost per kWh Comparison
Upfront vs lifetime $/kWh of two battery options.
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Battery Inverter Size Calculator
Inverter kW rating with headroom and surge coverage.
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