Frequently Asked Questions
How many days of autonomy are enough for an off-grid system?
Off-grid systems typically use 2 to 3 days in sunny climates and up to 5 days in regions with long cloudy winter stretches. More days means a larger, more expensive bank, so trade autonomy against generator hours and cost.
Should I use 100 percent of the battery nameplate capacity?
No. Lead-acid batteries should not be discharged past 50 percent to protect cycle life. Lithium tolerates 80 to 90 percent depth of discharge. The calculator applies the correct DoD automatically based on the chemistry you select.
How does temperature affect battery autonomy?
Cold temperatures cut lead-acid effective capacity by 20 to 50 percent. Install the bank in a protected, insulated space and apply a temperature correction factor when sizing for cold climates - lithium handles cold far better than lead-acid.
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Estimates for informational purposes only.
Important Disclaimer: Estimates for informational purposes only.
This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.