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Solar System Runtime Estimator
Calculate how long your solar battery system will last during power outages
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Frequently Asked Questions
How accurate is this solar runtime calculator?
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Our calculator provides estimates based on standard solar system calculations. Actual runtime may vary depending on factors like battery age, temperature, and actual power consumption patterns. For precise planning, consult with a solar professional.
What’s the difference between lead-acid and lithium batteries?
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Lead-acid batteries are more affordable but have shorter lifespans and lower depth of discharge (typically 50%). Lithium batteries (LiFePO4) are more expensive upfront but last longer, allow deeper discharges (80-90%), and are lighter weight.
How can I extend my solar system’s runtime?
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You can extend runtime by: 1) Adding more battery capacity, 2) Reducing your power consumption, 3) Using more efficient appliances, 4) Adding solar panels to recharge batteries during daylight, or 5) Using a generator as backup.
Why does inverter efficiency matter?
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Inverters convert DC battery power to AC power for your appliances, and some energy is lost in this process. Higher efficiency inverters (90-95%) waste less power, giving you more usable energy from your batteries.
Can I use this calculator for off-grid systems?
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Yes, this calculator works for both off-grid and backup power systems. For off-grid systems, you’ll also need to consider solar panel output to ensure your batteries recharge adequately during daylight hours.