An EV plugged into India's grid runs on 75% fossil fuel. Solar + storage is the only way to make electric mobility genuinely zero-emission.
India's electricity grid has a carbon intensity of approximately 700–720 g CO₂/kWh (CEA 2024 data). Every kilowatt-hour drawn from the grid carries that embedded carbon — regardless of whether it powers a light bulb or charges an EV.
An EV consuming 15 kWh/100 km charged entirely from the grid produces roughly 105–110 g CO₂/km. A modern petrol car emitting 120–140 g CO₂/km isn't far behind. The EV wins — but by a thin margin, not the "zero emission" claim that marketing suggests.
| Charging Source | g CO₂/kWh | g CO₂/km (EV @ 15 kWh/100 km) | Reduction vs Petrol |
|---|---|---|---|
| Indian Grid (avg) | 710 | 106 | ~23% |
| Grid (evening peak, coal-heavy) | 820–900 | 123–135 | ~3–10% |
| Grid (midday, high solar mix) | 500–550 | 75–82 | ~40% |
| Rooftop Solar (direct) | 25–40* | 4–6 | ~96% |
| Solar + Battery | 40–60* | 6–9 | ~94% |
*Lifecycle emissions including panel manufacturing, transport, and installation. Operational emissions are zero.
The timing matters enormously. Evening grid electricity is dirtier than the daily average because peaking plants — typically coal or gas — ramp up to meet demand. Charging your EV at 8 PM from the grid produces more carbon per kilometre than the average grid figure suggests.
For EV charging to be genuinely zero-emission, three conditions must be met simultaneously:
A common misconception: "I export solar energy during the day and import the same amount at night for my EV — net zero." This is an accounting trick, not a physics fact. The electrons you exported were consumed by a neighbour immediately. The electrons you import at night come from coal plants that are running to meet evening demand. You haven't stored sunshine — you've traded daytime credits for nighttime coal power. The grid's carbon intensity at 8 PM is 820–900 g CO₂/kWh regardless of your net metering balance.
The simplest configuration: solar panels → charge controller → EV charger. Works only during sun hours. Practical for home-based EVs that are parked during the day (work-from-home, retired owners, second vehicles). No battery cost. Charging rate varies with irradiance — a cloud dropping generation from 3 kW to 800 W means the charge slows significantly, and some EV onboard chargers have minimum current thresholds below which they stop charging entirely.
Solar panels charge a battery bank during the day. The EV charges from the battery whenever the owner plugs in — evening, night, or early morning. The battery acts as a time-shifter. This is the only configuration that delivers true green charging at any hour.
| Component | Specification | Purpose |
|---|---|---|
| Solar Array | 3–5 kWp (for 10–15 kWh daily EV demand) | Primary energy source |
| Battery Bank | 10–15 kWh LFP | Store solar for evening charging |
| Inverter/Charger | 3–5 kW pure sine wave | DC-AC conversion, load management |
| EV Charger (EVSE) | 3.3 kW (Type 2) or 7.4 kW | Deliver power to EV safely |
| Charge Controller | Distributed MPPT, matched to array | Maximum harvest from panels |
A typical Indian EV (Tata Nexon EV, MG ZS EV, or Ather 450X) driven 30–50 km daily consumes 6–12 kWh. In Bangalore with 5.0 peak sun hours:
These are the additional solar and battery capacities on top of what your home loads already need. A home consuming 15 kWh/day with a Nexon EV doing 40 km/day needs a total system of approximately 5 kWp solar and 20+ kWh battery for complete grid independence.
Cost comparison for an EV driven 40 km/day (~7 kWh charging) in BESCOM jurisdiction:
| Parameter | Grid Charging | Solar + Battery Charging |
|---|---|---|
| Daily energy for EV | 7 kWh | 7 kWh |
| Cost per kWh | ₹7.5–8.5 (slab 4+) | ₹2.8–3.5 (LCOE over 15 years) |
| Daily charging cost | ₹52–60 | ₹20–25 |
| Annual charging cost | ₹19,000–22,000 | ₹7,300–9,100 |
| 10-year charging cost | ₹2.5–3.5 lakh* | ₹73,000–91,000 |
| CO₂ per year | 1,820 kg | ~0 kg (operational) |
*Grid tariffs assumed to escalate 5–7% annually (BESCOM historical trend). Solar LCOE is fixed at installation.
The key economic advantage: grid tariffs escalate. BESCOM residential rates have risen from ₹4.15/kWh to ₹8.15/kWh for high-consumption slabs over the past decade. Solar's levelised cost is locked at installation. Over 10 years, the gap widens significantly. Adding EV charging to your home load also pushes you into higher BESCOM tariff slabs — every additional kWh from the grid costs more than the last.
Alloy Charge systems are designed for EV charging loads. The FreedomVolt inverter handles the sustained 3.3 kW draw of a Level 2 EV charger without voltage sag or thermal throttling. The PowerVault LFP battery supports daily deep cycling at 1C discharge rates — essential when a 10 kWh battery is delivering 3.3 kW for 3 hours to charge an EV. The SunXtractor distributed MPPT controllers harvest maximum solar even from partially shaded arrays, ensuring the battery is fully charged before your evening EV charging session begins.
Commercial EV charging stations face a different calculus. A station with four 7.4 kW AC chargers and one 50 kW DC fast charger has a peak demand of ~80 kW — equivalent to a small factory. Grid connection at this capacity requires HT (High Tension) supply, demand charges, and sanctioned load approval — a process that takes 3–6 months and costs ₹5–10 lakh in infrastructure charges alone.
Solar + battery can serve a portion of this load, reducing grid dependency and demand charges. A 30 kWp solar array with 100 kWh battery storage can handle the AC chargers entirely during daylight and buffer 2–3 DC fast charge sessions. This reduces the required sanctioned load, cuts demand charges, and provides backup when the grid goes down — which in many Indian locations happens daily.
Bidirectional EV charging allows the car's battery to power the home during grid outages or evening peaks. A Nexon EV with a 40.5 kWh battery can power a typical Indian home (1.5 kW average load) for over 20 hours. This transforms the EV from a pure consumer of energy into a mobile battery bank — but requires a bidirectional charger and an inverter that supports external battery input. V2H is emerging in India but currently limited by charger availability and vehicle compatibility (the BYD Atto 3 and MG ZS EV support V2G/V2H in some markets; Indian-spec vehicles are catching up).
We design solar + storage systems sized for your home loads and your EV. True zero-emission driving starts on your rooftop.
Design My Solar EV System