The Last Inverter Battery You'll Ever Buy.
Pure sine wave inverter + LFP battery + MPPT solar controller. One system. ₹26,000. Zero maintenance for 10 years. The lead-acid replacement that finally makes financial sense.
Every 3 Years, the Same ₹14,000 Mistake.
The battery dies — always in May, always during a cut. You call the shop. They send a guy. He hauls out the old box, leaves a trail of acid on your floor, and installs a new one. You put it out of your mind.
Until the next time.
The Water Ritual
Distilled water top-ups every 6 months. Corroded terminals. Chemical smell.
Skymin: Sealed. Zero maintenance. Ever.
The 3-Year Replacement
Lead-acid lasts 3–4 years. You're on a billing cycle — for your battery.
Skymin: 3,000+ cycles. 8–10 years of daily use.
The Square-Wave Problem
Budget inverters send choppy power to your appliances. Your fridge runs hotter. Your motor wears faster. You won't notice until it's too late.
Skymin: Pure sine wave. Grid-quality power.
The 50% Illusion
Lead-acid degrades permanently if discharged below 50%. A "150Ah" battery only gives you 75Ah of actual usable power before the lead plates sulfate.
Skymin: 90% Depth of Discharge. You actually get what you pay for.
Stop Paying the Lead-Acid Tax.
Most people think they're buying cheap. They're not. They're buying cheap upfront — which is the most expensive kind of cheap there is.
The Lead-Acid Tax
10-Year Costs
The Skymin System
10-Year Costs
You save ₹50,000 over 10 years.
That's not marketing. That's subtraction.
Numbers assume current battery pricing. Actual savings increase as lead-acid prices rise.
"But ₹26,000 upfront feels steep."
It is. We'll be honest. But you're not paying ₹26,000 for a battery — you're paying ₹26,000 to never buy another battery again. That's a different purchase.
One Box. Everything Inside.
The Skymin System — a complete inverter system with the MPPT solar controller already built in. Not an add-on. Not an upgrade. Standard.
LFP Chemistry
The safest lithium chemistry. No acid, no explosive gas, no thermal runaway. Cleared for indoor installation.
Pure Sine Wave Inverter
Grid-quality power for every appliance. Your fridge, your AC, your laptop — none of them know the grid is out.
Built-in MPPT Controller
When you're ready to add solar panels, you plug them in. No new hardware. No compatibility questions.
Smart BMS
The battery monitors and protects itself from overcharge, over-discharge, and short circuits. Set it up once, forget it exists.
3× Faster Charging
Short power cuts? You still get full backup. Two hours of grid charges the battery meaningfully. Lead-acid can't say that.
No New Wiring
It replaces your old inverter and battery setup entirely. Same plug, same connections. We deliver and install it directly at your doorstep in Chennai.
Which Skymin Are You?
Three buyer types. One system. Pick the path that fits your situation.
The last battery replacement you'll ever make.
You've replaced your lead-acid at least once. You want zero maintenance, lower lifetime costs, and to never call a battery shop again.
- Sine wave inverter
- 1.28kWh LFP battery
- MPPT controller (built in)
₹26,000
Installed. 7-year warranty. Chennai delivery.
Replace My Setup →Multi-day backup. Even when the grid's out for days.
You have roof or balcony access. You remember Cyclone Michaung. You don't want to ration phone charge on day three.
- Everything in Core
- 500W solar panel
- Mounting hardware
₹26,000 + panel
Panel pricing varies by roof/balcony setup. Get a quote.
Build My Storm System →Your electricity bill — smaller. Every month.
You're paying ₹6–11/unit. Your consumption is punishingly high. You want the expensive units replaced first by solar, automatically.
- Everything in Core
- 500W solar panel
- ~2 units/day offset
- Payback in 2–5 years
₹26,000 + panel
Off-grid setup. No DISCOM approval. No paperwork. No inspector.
Calculate My Bill Savings →A Balcony Works. You Don't Need a Roof.
Most Chennai apartments have a south or west-facing balcony that gets 4–5 hours of direct sun. That's enough for a 500W panel to generate 1.5–2.5 units a day — straight into your Skymin system.
No DISCOM approval. No net metering application. No inspector visit. No subsidy paperwork. An off-grid system connects panel to battery to home, and TANGEDCO has nothing to do with it.
You can set this up in an afternoon.
During storms
Even overcast Chennai skies generate 100–200W of input. Your battery recharges while your neighbours wait.
Every regular day
~2 units/day offset from your most expensive power tier. At ₹8/unit, that's ₹5,840/year. Payback in under 3 years.
Questions We'd Ask Too.
Yes. The MPPT controller is built in, but using solar is completely optional. Most of our customers buy this purely as a lead-acid replacement. Solar is there when you're ready. There's no obligation.
That's lithium cobalt oxide — the chemistry in phones and some EV packs. LFP (lithium iron phosphate) is completely different. It's used in commercial EVs specifically because it doesn't catch fire. It's the safest lithium chemistry available.
We provide a 7-year warranty with doorstep service in Chennai. You won't need a local shop. You have us — and a BMS that catches issues before they become problems.
The 1.28kWh Skymin system handles lights, fans, routers, TVs, and refrigerators comfortably. Running a 1.5-ton AC continuously requires a larger system. WhatsApp us your load list — we'll recommend the right configuration and be honest if this isn't the fit.
For a straight replacement (same inverter, new battery): no. It's a direct swap. For panel installation we recommend a professional, and we can arrange that as part of the package.
Skymin LFP System
LiFePO4 · 3,000+ Cycles · Smart BMS
Trusted inverter chemistry. Not new, not experimental — the same cells in commercial electric vehicles.
Skymin — skym.in
Chennai-based · D2C pricing
No middlemen, no markup chain. You buy directly. We deliver, install, and support.
7-Year Warranty
Doorstep service in Chennai
If something's wrong, we fix it. No shop visits. No third parties. Just call us.
Power You Can Rely On.
Chennai summers demand reliable backup. Why worry about your old lead-acid battery failing when you can upgrade to a system designed to last a decade?
You can keep replacing it the old way — ₹14,000 every three years — or
you can make the smart choice and make this the last time.
The maths is already done.
Free delivery in Chennai · 7-year warranty · Compatibility confirmed before you pay