This guide answers "Best solar size for 2 EVs at home" for Indian homes and apartments with a direct answer first, then a practical example, action steps, safety checks, cost logic and related ChargeWise tools.
The Core Answer (No Fluff)
For two EVs, solar size should be based on combined monthly kilometres, not vehicle count alone. Two heavy-use EVs may need several extra kW of rooftop capacity.
Use the answer for planning, then verify the final electrical design, DISCOM process and society condition locally before installation.
Simple Indian Example
Example: two EVs using 300 kWh/month together may need roughly 2 to 3 kW of extra solar capacity depending on local solar generation.
Step-by-Step Action Plan
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1
Step 1
Estimate monthly km for both EVs.
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2
Step 2
Convert to kWh with losses.
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3
Step 3
Add household units.
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4
Step 4
Check roof space, inverter size and net metering limits.
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5
Step 5
Consider load management if both cars charge together.
Safety Note
Do not improvise EV charging with extension cords, shared wiring or unknown earthing. EV charging runs for hours, so final wiring, protection devices and weatherproofing should be checked by a qualified electrician.
Cost or Calculation
Extra solar kW = combined EV monthly units / monthly units generated per solar kW.
Practical Field Notes for India
Use this solar plus ev charging guide as a working note for EV owners considering rooftop solar and Homeowners sizing solar for EV charging. The quick answer is useful, but the final choice should be tied to your meter, parking bay, wiring route, charger datasheet, tariff category and written approvals.
Solar economics depend on local generation, net metering rules and self-consumption. EV charging can improve solar payback when it increases useful household consumption.
Take photos of the meter room, parking bay and cable route before requesting quotes.
Before you finalize Best solar size for 2 EVs at home, make one small comparison table for your own case: current setup, desired setup, approval needed, electrical change, one-time cost and monthly running cost. This keeps the decision practical and makes it easier for a family member, society manager or electrician to review without re-reading the full article.
Site note
Record the real-world constraint
For Best solar size for 2 EVs at home, start by writing down the site condition that can block the decision: EV monthly units. Compare it with the practical signal "Monthly km divided by efficiency" before you spend money.
Approval
Convert the answer into evidence
If a society, installer, landlord or DISCOM is involved, turn the guide into a short evidence pack. Include photos, bill inputs, route length, charger rating and the local check linked to "Solar generation".
Safety
Do the electrical review before routine charging
The safe version of this decision depends on earthing, protected cable routing, correct breaker coordination and residual-current protection. The mistake to avoid is: Using a temporary extension cord as a permanent solution.
Cost
Use a personal number, not an average
For Indian bills, the final cost often changes with slab tariff, sanctioned load, fixed charges, cable length or apartment billing method. Prefer a smaller safe charger over a faster charger that overloads the connection.
Next step
Turn the page into an action
After reading, use "Open solar EV calculator" with your own tariff, parking, charger power, monthly kilometres and approval status. Avoid this second common error: Choosing charger power before checking sanctioned load.
Who This Page Is For
- EV owners considering rooftop solar
- Homeowners sizing solar for EV charging
- RWAs comparing common-area solar and EV load
Technical and Contextual Deep Dive
| Sizing input | Practical range | Why it matters |
|---|---|---|
| EV monthly units | Monthly km divided by efficiency | Decides extra solar capacity. |
| Solar generation | Local units per kW per month | Varies by state, shade and season. |
| Charging timing | Daytime or night | Daytime charging improves self-consumption. |
| Net metering rule | DISCOM/state policy | Controls export credit value. |
Technical notes
- Use real site measurements instead of brochure assumptions.
- Document the result so future residents, electricians or society managers can inspect it.
- When rules or tariffs affect the answer, verify the latest DISCOM or society requirement before payment.
India-Specific Context
- Solar economics depend on local generation, net metering rules and self-consumption.
- EV charging can improve solar payback when it increases useful household consumption.
- Hybrid solar should be chosen for backup needs, not only for bill savings.
Expert Pro-Tips for India
- Take photos of the meter room, parking bay and cable route before requesting quotes.
- Prefer a smaller safe charger over a faster charger that overloads the connection.
- Keep bills, approval letters, installation invoices and test reports in one folder.
- Review the setup after the first few charging sessions for heat, tripping or cable damage.
Common Mistakes
- Using a temporary extension cord as a permanent solution.
- Choosing charger power before checking sanctioned load.
- Submitting an approval request without route photos or safety details.
- Ignoring charging losses or slab tariffs in monthly cost estimates.
Frequently Asked Questions
Best solar size for 2 EVs at home?
For two EVs, solar size should be based on combined monthly kilometres, not vehicle count alone. Two heavy-use EVs may need several extra kW of rooftop capacity.
What should I check first?
Start with the practical blocker: parking and permission for apartment topics, sanctioned load for charger topics, wiring and protection for safety topics, and effective tariff for cost topics.
What is the safest default approach?
Use a dedicated circuit, proper earthing, correctly selected MCB and RCCB/RCBO, protected cable route, and written documentation from a qualified electrician.
Which ChargeWise tool should I use next?
Use the home charging calculator for cost, the sanctioned load checker for load headroom, and the apartment feasibility checker when a society or RWA approval is involved.
Should I verify this with my DISCOM or society before installation?
Yes. Use this page for planning, then verify the latest tariff category, connection process, sanctioned load, and RWA requirements with your local DISCOM or society office.
Can this guide replace an electrician or engineer?
No. EV charging is a continuous electrical load. Final wire size, protection devices, earthing, breaker rating, and installation method should be confirmed by a qualified electrician or licensed electrical contractor.
Next Step
Use the calculator with your tariff, parking, charger power and monthly kilometres to turn this guide into a personal estimate.
Open solar EV calculator