Estimate an off-grid solar system size, solar panel array, number of panels, battery bank size, inverter size, backup days, generator support, and total system cost. Use this calculator for cabins, tiny homes, RVs, sheds, farms, remote buildings, and full off-grid power systems.
Daily use mode:
The calculator starts with daily kWh use and sizes the solar array, panel count, battery bank, inverter, and estimated cost.
Loads mode:
The calculator multiplies average load watts by hours per day to estimate daily kWh, then sizes the system from that load.
Budget mode:
The calculator estimates how much solar array capacity may fit within the entered budget after battery and equipment costs.
Full estimate mode:
The calculator includes solar panels, batteries, inverter equipment, backup days, losses, generator share, and installation costs.
An off-grid solar calculator helps estimate whether a solar power system can support daily loads without relying on the utility grid.
It can help compare solar array size, number of panels, battery bank kWh, amp-hours, inverter size, generator support, system losses, backup days, and estimated off-grid system cost.
Your result shows estimated daily energy use, required solar array size, number of solar panels, daily solar production, required battery bank size, battery count, battery amp-hours, inverter size, generator-supported energy, and estimated off-grid system cost.
Start with daily energy use in kWh, divide by peak sun hours and system efficiency to size the solar array, then size the battery bank for the desired number of backup days.
Divide the required solar array watts by the wattage of each panel. For example, a 4,000-watt solar array using 400-watt panels needs about 10 panels.
Multiply daily kWh use by backup days, then adjust for depth of discharge and battery efficiency. More cloudy-day backup requires a larger battery bank.
Not always, but many off-grid systems use a generator as backup during long cloudy periods, high winter loads, or unexpected battery depletion.
No. This is an estimate. Actual off-grid solar sizing can vary based on location, weather, seasonal sun hours, appliance usage, surge loads, battery chemistry, inverter limits, shading, wiring losses, and local electrical code.