V2H Home Backup Calculator
Vehicle-to-home: how long an EV pack can back up your house, and the value per outage.
An EV in the driveway is the biggest battery most homes will ever own — a 40 kWh pack runs a 1 kW essential load for a day and a half. Model the energy economics here (buy night kWh, use them in an outage or evening peak); for pure backup, treat 'sell rate' as the diesel-genset cost you avoid (₹25–35/kWh).
V2G pays only when the price spread beats round-trip losses plus battery wear. LFP packs (4,000+ cycles) wear ~half as fast per kWh as NMC — chemistry decides whether the same spread is profit or loss.
Indicative estimates only, not financial or investment advice. Tariffs, subsidies and net-metering rules change — verify with your DISCOM, utility or installer before committing.
Use the free V2H Home Backup Calculator online — Vehicle-to-home: how long an EV pack can back up your house, and the value per outage. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About V2H Home Backup Calculator
An EV in the driveway is the biggest battery most homes will ever own — a 40 kWh pack runs a 1 kW essential load for a day and a half. Model the energy economics here (buy night kWh, use them in an outage or evening peak); for pure backup, treat 'sell rate' as the diesel-genset cost you avoid (₹25–35/kWh).
How to use V2H Home Backup Calculator
- 1Enter pack size and the daily energy you'd export.
- 2Set buy and sell rates from your tariff/program.
- 3Read gross revenue, energy cost, wear cost and the honest net.
Why use V2H Home Backup Calculator?
- ✓Honest three-line accounting: revenue, buy-back energy, battery wear
- ✓Cycle-wear cost priced per exported kWh — the line most V2G pitches omit
- ✓Market presets for spreads and programs that actually exist
- ✓Net annual value, positive or negative, in one number
Frequently asked questions
Is vehicle-to-grid actually profitable?+
Only when the price spread beats round-trip losses plus battery wear. With an LFP pack, 88% RTE and a ₹5+/kWh spread, modest daily exports net a real profit; with NMC wear costs and thin spreads, V2G loses money politely. This calculator's three-line accounting shows your case.
How much does V2G wear out the battery?+
Each exported kWh adds throughput: cost ≈ pack value ÷ lifetime throughput. For a ₹12k/kWh LFP pack rated 4,000 cycles, wear runs ~₹0.7–1/kWh exported; NMC roughly doubles that. Wear cost is the gatekeeper — chemistry decides whether the same spread is profit or loss.
What's the difference between V2G and V2H?+
V2G sells into the grid/market and needs utility programs plus a bidirectional charger; V2H powers your own home during peaks or outages — no program needed, and the 'sell rate' is your retail tariff or the diesel-genset cost you avoid. V2H usually pencils first.
Does V2G void EV battery warranties?+
Historically many OEMs excluded it; that's shifting — several now warrant approved bidirectional use. Check your warranty's language on 'external discharge' before enrolling, and keep exports within any stated envelope. The wear math here helps you decide if it's worth even asking.
Embed V2H Home Backup Calculator on your website
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