Battery Sizing Tool

How much battery do you actually need?

Pick the appliances you want to keep running during a power cut and how long you need backup. We'll size the battery so you're not paying for unused capacity.

Choose your appliances

Use +/− to set how many of each you want on backup

LED Lights 20W each

Ceiling Fans 75W each

TV (LED) 120W each

Refrigerator 150W each

WiFi Router 10W each

Laptop / Computer 150W each

Mixer / Grinder 600W each

Washing Machine 500W each

Microwave 1200W each

Water Pump 750W each

AC 1 Ton 1000W each

AC 1.5 Ton 1500W each

Backup hours required 4 hrs

1h6h12h

Recommended battery

3.0 kWh

Lithium-ion · 80% DoD usable · 10-yr warranty

Connected load 0 W

Avg running load (65%) 0 W

Energy needed (4h) 0 Wh

Indicative battery cost ₹0

Brand: Luminous · Livguard · BYD · Waaree · Cellcronics · DEYE IP65 outdoor-safe

Get a Quote for this Battery

* Sizing assumes 65% concurrent use & 80% depth-of-discharge. Final size confirmed after a site survey.

Rooftop vs Hybrid

Same panels. Very different outcome during a power cut.

Standard Rooftop Solar

Cuts monthly bill 40–80%
Net metering with DISCOM
Shuts down during outages
No night-time power from solar
Still need inverter/genset for backup

Hybrid

Hybrid Solar (this page)

Cuts monthly bill 50–90%
Keeps running during power cuts
Powers your home at night from stored energy
Smart load prioritisation (essentials first)
Replaces your inverter & UPS — one box

What's actually included

A complete energy system. Not just solar with a battery taped on.

Included in your price

Tier-1 panels — TATA, Adani or Waaree
True hybrid inverter (single unit, not retrofit)
Lithium-ion battery bank (LFP chemistry)
Auto changeover & islanding controller
Smart load prioritisation panel
Mobile app — live SOC, generation, load split
First-year AMC + battery health calibration

Handled by us — at no extra cost

Site survey + 7-day load profile audit
Battery sizing from your actual usage data
PM Surya Ghar subsidy filing (on solar portion)
DISCOM net-metering paperwork
Critical-load circuit segregation
Bank loan referral (if needed)
25-year solar + 10-year battery warranty registration

How it works

From load audit to "power cut? what power cut?" in 35–50 days.

01

Load audit & site survey Day 1–7

We log your actual consumption for a week — peak loads, night usage, outage duration — and design battery + panel size around real data, not guesswork.
02

System design & quote Day 7–10

Fixed-price proposal with exact panel kW, battery kWh, backup hours per critical load, and break-up of every line item.
03

Subsidy & DISCOM filing Day 10-25

We submit your PM Surya Ghar application (solar component) and net-metering forms to your DISCOM in parallel with installation.
04

Installation & load wiring Day 25-40

Certified crew installs panels, inverter and battery bank, segregates critical-load circuits and configures auto changeover. 5–10 days for homes, 14–21 for commercial.
05

Commissioning & battery calibration day 40-60+

Full charge-discharge cycle to calibrate battery management, app onboarding, and DISCOM meter swap. Subsidy lands. Ongoing AMC begins.

Why Vermson

Right-sized batteries. Not "buy the biggest one we sell".

Sized from real usage

A week of actual load logging — not a 5-minute walk-through. Battery and inverter are sized for your outages, not a brochure.

Critical-load wiring

We separate essentials (fridge, lights, fans, router, medical) from heavy loads (AC, geyser, motors) so your battery lasts when it matters.

Lifetime monitoring

Mobile app shows generation, battery SOC, load split and outage backup time — live. AMC plans cover panel cleaning + battery health checks for 25 years.

5,000+

Solar rooftops powered

25 MW

Clean energy installed

25+ yrs

Of solar expertise

₹78k

Subsidy filed for you

Get your hybrid solar quote

Tell us your bill and outage hours — we'll send a fixed-price proposal in 24 hours.

or call us directly 1800 889 0253

Other solar services

FAQ

What people ask before going hybrid

Answers to the questions we hear most. Have a different one? Drop us a message and we'll write you back.

01.How long does the battery last during a power cut?

Depends on battery size vs. load. A typical 5 kWh LFP battery runs critical loads (lights, fans, fridge, router, TV) for 6–10 hours. We size from your actual outage duration — if you average 3 hours of cuts, we won't sell you a 12-hour battery.

We install Lithium LFP by default — 10-year warranty, 6,000+ cycles, fits in a small wall-mounted box, no maintenance. Lead-acid is cheaper upfront but lasts 3–5 years, needs ventilation and water top-up. Over 10 years, lithium is meaningfully cheaper.

Yes. We retrofit existing rooftop systems with an AC-coupled or DC-coupled battery + hybrid inverter, depending on your current inverter. The economics work best if your inverter is <5 years old. Free site assessment will tell you which retrofit path fits.

The solar component qualifies — you get the same central subsidy (up to ₹78,000) as a standard rooftop system. The battery isn't currently subsidised but qualifies for accelerated depreciation if you're a business. We file all eligible claims for you.

Lithium LFP batteries last 10–12 years (6,000+ deep cycles) at 80%+ capacity. Most users replace once during the panel's 25-year life. Battery technology is also getting cheaper every year — by replacement time, you'll likely pay 40–60% less for double the capacity.

Hybrid wins almost every time. A 5 kVA diesel genset costs ₹1.5–2 lakh and burns ₹15–25/hour in fuel. A hybrid system pays for itself in 4–6 years through bill savings alone — and gives you silent, automatic backup with zero fuel cost.

Power cuts? Not your problem anymore.

You need hybrid (not just rooftop) if…