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Solar & Electricity Calculator
Planning estimates, reviewed October 2026 — flat-rate math on your figures, not DISCOM slabs or a site survey. Confirm tariffs and sizing with your bill and vendor.
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The suggested VA is total running watts × a safety factor: 2000 W at 1.2 needs a 2400 VA inverter. The headroom covers power-factor difference between VA and watts plus brief start-up surges, so the inverter never runs flat out on an ordinary evening.
Add up every appliance that may run together — not the house total, the simultaneous peak — and keep the default 1.2–1.3 factor for electronic loads. Pumps, compressors, and washing machines surge several times their running watts on start: size those generously or keep them off the inverter, and confirm motor starting with the vendor.
It does not model individual motor surges, battery capacity, or wiring and earthing — a VA starting point, with the vendor sizing the system around your actual load profile.
VA starting point — vendor sizes around your load profile.
Because power factor and start-up surges mean the inverter must supply more VA than the running watts suggest. The safety factor covers that gap.
A common allowance is around 1.2–1.3; increase it if you run motor-driven loads that surge on start.
Only if the inverter and battery are sized for its running watts plus compressor surge — most small backup systems exclude heavy cooling loads by design.
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