Battery, Generator And Backup Power
Battery amp-hours, backup runtime, inverter watts, generator kW, UPS runtime, and fuel cost calculators.
Solar And Backup Power
Battery capacity, runtime, inverter size, UPS capacity, generator load, fuel use, and backup power planning.
Subcategories
EV Charging And Electrical Infrastructure
EV charger load, EVSE circuit size, charging energy, shared charging allocation, and service impact calculators.
Published Calculators
UPS Battery Size Calculator (Ah, Wh, kWh)
Provide a preliminary UPS battery energy and amp-hour estimate from load power, target runtime, conversion efficiency, usable capacity, and battery voltage.
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UPS Runtime Calculator (Battery Backup Hours)
Calculate UPS runtime and battery backup duration from usable battery energy, load power, conversion efficiency, and reserved energy before checking the manufacturer runtime curve.
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Solar Battery Runtime Calculator
Estimate usable battery energy and runtime from battery capacity, system voltage, load, depth of discharge, and system efficiency.
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Off Grid Load Calculator
Estimate daily energy, autonomy energy, average current, and amp-hours from an entered off-grid load, runtime, autonomy period, and system voltage.
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Inverter Efficiency Calculator
Estimate inverter efficiency, loss power, and loss percent from matching DC input and AC output power values.
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Generator Transfer Load Calculator
Estimate transfer load, usable generator capacity, reserve margin, and utilization from entered ratings and load assumptions.
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EV Solar Charging Calculator
Calculate allocated PV energy, EV-delivered energy, driving miles, and remaining grid energy from entered solar and EV assumptions.
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Battery Discharge Current Calculator
Calculate battery-side current from a stated load, nominal battery voltage, and conversion efficiency.
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Backup Load Priority Calculator
Compare critical and essential backup loads with reserved source capacity to identify supportable optional load.
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Backup Generator Sizing Calculator
Calculate backup generator running load, starting contribution, reserve, and planning kVA from entered load conditions and power factor.
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Residential Sump Pump Backup Runtime Calculator
Review an intermittent sump-pump backup scenario using named pump and backup-equipment data. The result does not guarantee flood protection or emergency runtime.
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Residential EV Daily Energy and Charger Power Calculator
Convert daily driving, vehicle efficiency, charging efficiency, and available home-charging time into an average EV charging-power requirement.
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Residential EV Group Power Sharing Calculator
Allocate a fixed power cap across two or more EVSE or vehicle requests under an explicit sharing policy. The model does not infer product behavior.
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Residential EV Circuit Sharing Capacity Calculator
Review a named shared-circuit rule with an entered circuit limit, EVSE cap, appliance schedule, and battery-energy requirement.
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Generator Fuel Runtime Calculator
Estimates generator fuel burn and runtime from rated output, average load, usable tank volume, and a documented fuel-rate basis.
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Battery Charge Time Calculator
Estimates battery charging time from nominal capacity, starting state of charge, effective charge current, and charging efficiency.
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Battery Bank Series Parallel Calculator
Models nominal battery-bank voltage, amp-hour capacity, and stored energy from identical batteries arranged in series and parallel.
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Solar Battery Size Calculator (kWh, Wh, Ah)
Estimate solar battery-bank capacity in kWh, Wh, and Ah from load, autonomy, efficiency, and usable depth of discharge.
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Inverter Size Calculator
Estimates preliminary inverter capacity from running load, surge load, power factor, planning margin, and efficiency. It does not select a model or approve installation details.
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EV Charger Circuit Size Calculator
Estimate EVSE circuit ampacity and apparent load from entered charger current, voltage, phase, continuous-load factor, conductor ampacity, and OCPD values.
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EV Charging Time Calculator
Estimates EV charging time, grid energy, and miles added from battery capacity, state-of-charge window, charger power, efficiency, and vehicle efficiency.
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Battery Capacity Calculator (Wh, kWh, Ah)
Estimate battery backup capacity in Wh, kWh, and Ah from load power, runtime, system voltage, usable depth of discharge, and efficiency.
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Battery Runtime Calculator
Estimate battery runtime by converting nominal amp-hour capacity to usable watt-hours and dividing by load power. Battery chemistry, discharge behavior, temperature, BMS limits, and inverter performance require separate review.
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