BESS Sizer.
Building peak demand + solar generation + tariff curve in, indicative LFP battery size, annual savings and payback period out. Vertiv, Delta, Fuji-class deployments.
- Chemistry
- LFP
- Round-trip
- 88%
- Annual fade
- ≤ 10%
- Payback
- 5–8 yrs
— BESS · LFP chemistry · payback model
The battery your tariff justifies.
Peak-shave + solar self-consumption + grid-arbitrage savings → indicative LFP battery size, project cost, and payback. Conservative; final design audit required.
BESS size
1120 kWh
LFP chemistry · 158 kW shave
Annual savings
₹ 21.1 L
peak-shave + solar arbitrage
Project cost
₹ 4.37 Cr
Vertiv / TrinaSolar utility-scale
Simple payback
20.7 years
Cell life ~14 years
Daily BESS throughput
855 kWh
cycled once daily
CO₂ avoided
212 t / yr
grid factor 0.71 kg / kWh
Indicative — pack class scales with size. Small residential packs (≤ 50 kWh) carry SUNGROW / Delta hybrid pricing; commercial cabinets (50–500 kWh) ride Delta / Fuji LFP; utility-scale (> 500 kWh) drops to Vertiv liquid-cooled or TrinaSolar Elementa pricing. Site audit, load study and tariff verification required before commitment.
· Example use
A boutique hotel in Shillong runs a 380 kW peak demand, has 220 kWp of rooftop solar and pays a steep evening tariff. The sizer points at a 450 kWh LFP pack — large enough to shave the 6 to 9 PM peak and arbitrage a slice of the night tariff. Payback lands inside seven years, before any commercial-and-industrial subsidy.
· Frequently asked
BESS sizing —
what people ask first.
Why LFP and not NMC?
Lithium iron phosphate is thermally stable, safer in occupied buildings and tolerates the daily deep-cycle pattern that peak-shaving and self-consumption demand. NMC has higher density but a worse safety and longevity profile for stationary use.
How conservative are the savings numbers?
We use a flat round-trip efficiency of 88 percent, ten percent annual capacity fade across the first decade, and tariffs you supply rather than escalated forecasts. The output is the floor, not the headline.
What about diesel-replacement applications?
Possible, but the model here is grid-tied. For diesel-replacement or off-grid hybrids we run a separate study with hourly load profiles and PV generation curves — send the data and we will quote a feasibility study.
Do you handle the regulatory side?
Yes. CEIG approval, fire-NOC for the battery room, electrical-inspector sign-off and DISCOM net-metering paperwork are all part of a turnkey BESS scope. We have closed projects across Assam, Meghalaya and West Bengal.
Which inverter and BMS brands do you specify?
Vertiv, Delta and Fuji-class hybrid inverters with manufacturer-grade battery management. Cell-level monitoring, active balancing and Modbus integration into the BMS are non-negotiable on our scopes.
· Begin
Sizing a battery
for a real building?
Send the load profile, the solar generation file and the tariff structure. We will return a sized system and a payback model within two working days.