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Battery Backup Calculator
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Frequently Asked Questions
How do I calculate my total load power?
Add up the wattage of all devices you want to power simultaneously. Check device labels or manuals for wattage information. For devices that list amps instead of watts, multiply amps by voltage (usually 120V in the US) to get watts.
What’s the difference between lead-acid and lithium batteries?
Lithium batteries are more expensive but last longer, are more efficient (85% vs 50%), lighter, and can be discharged more deeply. Lead-acid batteries are cheaper but require more maintenance and have shorter lifespans.
Why is depth of discharge important?
Depth of discharge (DoD) affects battery lifespan. Regularly discharging beyond recommended DoD can significantly reduce battery life. Lithium batteries typically allow 80-100% DoD, while lead-acid should only be discharged to 50%.
How does battery voltage affect my system?
Higher voltage systems (24V or 48V) are more efficient for larger loads as they reduce current, allowing smaller wires and less energy loss. 12V systems are common for small applications like RVs or small solar setups.
What safety factor should I use?
A 10-20% safety factor is recommended to account for battery aging, unexpected load increases, or efficiency losses. In critical applications, you might use an even higher safety margin.