Net metering is the billing arrangement that decides what your exported solar power is worth. Under full net metering, every kilowatt-hour you send to the grid offsets one you buy later, so the grid works like a free battery. Where exports are paid at a lower rate than imports, charging your car from your own panels is usually worth more than exporting the power and buying it back at night.
Key Takeaways
- Net metering sets the price of your exported solar, and that price decides your best charging time.
- With full retail credit, timing hardly matters; with low export credit, charge from the sun when you can.
- Export terms change over time, so recheck your bill before relying on them.
How Net Metering Works
A bidirectional meter records power flowing in both directions. At the end of the billing period, the utility settles the difference. The detail that matters is the credit rate for exports, and it is set by your utility and your state, not by your solar installer.
| Arrangement | Export credit | What it means for EV charging |
|---|---|---|
| Full net metering | 1 kWh exported offsets 1 kWh imported | Timing matters less; night charging on the grid costs no more than daytime solar charging |
| Net billing | Exports paid below the retail price | Self-consumption wins; charge while the sun shines whenever you can |
| No export credit | Exports unpaid or not allowed | Every exported kilowatt-hour is lost value; matching charging to solar output matters most |
Many utilities have moved from full net metering toward net billing in recent years, and terms keep changing. Before you plan charging around an assumed credit, check the current export rate on your electricity bill or your utility’s website.
What It Means for When You Charge
If your exports earn the full retail rate, the cheapest strategy is simple: charge whenever it is convenient, because the grid settles the difference. If exports earn much less than the import price, the order flips. Using the U.S. average residential price of 18.31 cents per kWh as an illustration, a kilowatt-hour you export might be credited at only a few cents, while the same kilowatt-hour bought back at night costs the full retail price. Charging the car directly from the panels avoids that gap entirely.
This is the same trade-off described in our guide to charging an EV from solar panels: daytime charging uses your own generation, and overnight charging leans on the grid. Net metering decides which side of that trade-off is worth more at your address.
How to Get Charging Working With Your Tariff
- Read your bill first. Find the export or “distributed generation” line and note the credit per kWh.
- Match charge timing to the credit. Low export credit means daytime or surplus charging; full credit means timing is flexible.
- Use scheduling. A smart charger can hold charging for the hours you choose, as explained in our guide to smart charging and time-of-use tariffs.
- Review once a year. Export terms change, and a strategy that was right last year may not be now.
A Charger That Can Follow the Sun
Whatever your export arrangement, a charger with adjustable current and scheduling gives you the choice. The EV-ACS3210T portable charger adjusts from 10 A to 32 A in six steps, so it can draw less when solar output is low. The EV-ACT3204E wallbox adds app control and RFID for a fixed home setup. Neither changes your tariff; both let you act on it.
Frequently Asked Questions
Does net metering mean my EV charges for free?
No. Net metering credits exports against imports on your bill. You still pay connection charges and any usage beyond what you export, and charging from the grid at night is billed at the retail rate before credits are applied.
Can my utility change my net metering terms?
Yes. Utilities and regulators revise export rates and eligibility, and some existing customers keep older terms while new solar installations get newer ones. Check your current terms before making decisions based on them.
Does net metering apply if I have a home battery?
Generally yes: the meter settles whatever crosses it, whether the power came from panels or a battery. How battery exports are treated varies by utility, so confirm the details for your plan.
Related Reading
- Solar Panels and EV Chargers: How to Charge Your Car With Sunshine
- Smart Charging and Time-of-Use Tariffs: How Scheduling Cuts EV Charging Costs
- How Do Smart EV Chargers Work?
