Free Off-Grid Calculators
Stop guessing. These tools do the actual math for your specific situation. All calculations run in your browser — no signup, no data collected.
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Solar Panel Sizing Calculator
Enter your daily energy use and peak sun hours — get the exact number of panels, wattage, and system size you need.
Inputs
· Daily kWh
· Peak sun hours
· System efficiency
Outputs
· Panel count
· Total watts
· Array size
Takes ~2 min
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Battery Bank Sizing Calculator
Calculate the Ah capacity, number of batteries, and recommended voltage for your off-grid system.
Inputs
· Daily kWh
· Days autonomy
· Depth of discharge
Outputs
· Total Ah needed
· Battery count
· Buffered recommendation
Takes ~2 min
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Generator Sizing Calculator
Find the minimum wattage generator you need based on your running loads and motor surge requirements.
Inputs
· Running watts
· Motor surge watts
Outputs
· Minimum size
· Recommended size
· Fuel estimate
Takes ~2 min
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Water Storage Tank Sizing
Calculate the right water tank size based on your household size, daily use, and backup days needed.
Inputs
· People count
· Gallons/person/day
· Backup days
Outputs
· Min tank size
· Recommended size
· Tank to buy
Takes ~1 min
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More calculators coming soon
Load calculation tool, solar + battery combo planner, heating BTU calculator, and more.