Daily Power Usage Calculator
Work out your approximate daily amp hour (Ah) consumption so you can size the right battery bank, solar array and inverter for your off-grid setup. Select your fridge, add the 230V and 12V appliances you use, and the calculator totals everything - including a 10% inverter loss on AC items.
All figures are estimates at moderate ambient temperatures. For real-world accuracy, a battery monitor is always the best way to track actual consumption once your system is installed.
Fridge / Freezer
Tap to select — tap again to deselect. Select multiple if you run more than one. Figures are average 24hr consumption at moderate ambient temps.
Appliances that run through your inverter. A 10% conversion loss is already included. Set Uses/day to add an appliance to your total.
Custom AC: Ah is calculated per hour of use (includes 10% inverter loss). For partial-hour use, enter a decimal in the Qty column — 0.25 = 15 min, 0.5 = 30 min, 0.75 = 45 min.
Appliances running directly from your 12V battery — no inverter losses. Set Uses/day to add an appliance to your total.
Formula: Watts ÷ 12V ÷ 60 × minutes per use = Ah per use. No inverter loss applied.
Estimated daily usage
0
Ah per day
Use this figure in the Off-Grid System Sizer to calculate the solar and battery bank you need.
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