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Battery Backup Runtime Calculator

Use average running watts and target runtime to estimate the battery capacity you need. These are planning estimates, not physical test claims.

Runtime Planner

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This page assumes 85% usable efficiency to account for conversion losses and real-world overhead.

2,000 WhRequired usable energy
2,353 WhRecommended nominal capacity
1.7 hrsEstimated runtime for 1,000Wh

Suggested Starting Models

BLUETTI Apex 300

BLUETTI Apex 300

Verified product page for runtime planning and spec review.

2764.8Wh • 3840W

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EcoFlow DELTA 3 Ultra

EcoFlow DELTA 3 Ultra

large portable home backup

3072Wh • 3600W

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EcoFlow DELTA 3 Ultra Plus

EcoFlow DELTA 3 Ultra Plus

Verified product page for runtime planning and spec review.

3072Wh

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