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Click categories to add appliancesThis is how much electricity your appliances use in a typical day. A kilowatt-hour (kWh) is the same unit on your electric bill. For example, a 100-watt light bulb running for 10 hours uses 1 kWh.
The number of 300-watt solar panels needed to generate your daily electricity. We calculate this based on approximately 5 peak sun hours per day and add 15% extra to account for system losses.
Total energy storage capacity needed. This equals your daily use multiplied by the number of backup days you selected. More backup days = larger battery bank = higher cost, but more security during cloudy weather.
Batteries are often sold by amp-hours (Ah) at a specific voltage. To convert: Ah = kWh × 1000 ÷ Voltage. Higher voltage systems (24V or 48V) use thinner wires and are more efficient for larger setups.
12V — Good for small systems, RVs, and boats.
24V — Popular for medium-sized off-grid homes.
48V — Best for larger homes. Most efficient.
A rough estimate based on average 2024 prices: ~$200 per solar panel, ~$400 per kWh of battery storage, plus inverter and hardware costs. Actual prices vary by brand and location.