6 calculators in this category
- Solar Panel Array Sizing CalculatorNREL PVWatts methodologyEnter what you use — a monthly bill figure works fine — along with the peak sun hours at your site, a system loss allowance and…
- Solar String Voltage CalculatorNEC 2023 (NFPA 70) Article 690.7A photovoltaic module's open-circuit voltage rises as it gets colder, and the coldest morning of the year is when a string is…
- Battery Bank Sizing CalculatorIEEE 1013 sizing practiceEnter what you use in a day, how many days you want to ride through without charging, and how deeply you are willing to…
- Battery Runtime CalculatorPeukert's law (IEC 61056 hour-rate basis)Give this calculator a battery's amp-hour rating, its voltage, and the load in watts, and it returns the runtime in hours along…
- Inverter Sizing CalculatorNEC 2023 Table 310.16 for DC conductor ampacityAn inverter fails in one of two ways: it overheats and shuts down on a load it could not sustain, or it trips instantly on a…
- Generator Sizing CalculatorNEC Art. 445/702, NEMA code lettersEnter your total running load, the horsepower of the largest motor that starts across the line, the supply voltage and phase…
Which one do you need?
- Solar Panel Array Sizing Calculator
- Size a solar array in kW and panels from your kWh use, peak sun hours, system losses and offset target, with annual production and roof area.
- Solar String Voltage Calculator
- Check maximum and minimum PV string voltage against inverter limits using temperature-corrected Voc and Vmp, and find how many modules a string may hold.
- Battery Bank Sizing Calculator
- Size an off-grid battery bank in amp-hours and kWh from daily load, days of autonomy, depth of discharge and inverter losses. Includes wiring counts.
- Battery Runtime Calculator
- Work out how long a battery or bank will run a load in hours, with depth of discharge, inverter losses and the Peukert effect on lead-acid capacity.
- Inverter Sizing Calculator
- Size an inverter from your running load list, power factor and motor starting surge, then get the DC input current and the battery cable size it demands.
- Generator Sizing Calculator
- Size a standby or portable generator in kW and kVA from your running load, the largest motor's starting kVA, power factor and a reserve margin.