Charge your car on sunshine.
Sundial watches your solar production in real time and steers that surplus into your EV — instead of selling it to the grid for pennies. Automatic, hands-off, built for NEM 3.0.
Keep ~$50/mo of solar in your car — and your Powerwall full.
Sundial routes surplus solar to your Tesla instead of exporting it for 3¢, and never raids your battery. You set the floor; it coordinates the rest.
illustrative — your utility's rates set your real number
- Tesla · Powerwall · Enphase · SolarEdge · Wallbox · Emporia · ChargePoint · any OCPP charger
- Free to start · no card required
- New Every EV, not just Tesla — via your OCPP wall charger
Built in California to help EV owners with their Net Metering energy plans. Cancel in-app, anytime.
Charging on solar
1.5 kW
61% · on solar
Live in the app — solar-only charging, in real time
- ✓ Surplus solar goes to your car instead of being exported for pennies
- ✓ The car won't drain your Powerwall — stored energy stays reserved for your home, for the evening peak and outages
- ✓ You set how full the Powerwall charges before the car starts
- ✓ It coordinates automatically — set it once
Selling solar back to the grid is now the worst trade in your house.
Sundial closes the gap by burning your sunlight at home — into the car — instead of selling it for pennies.
Three connections. One automation. Zero new hardware.
Add the gear you already own. That's it.
Sundial connects through manufacturer APIs — Tesla Fleet, SolarEdge Monitoring, Enphase Enlighten. Nothing to wire, nothing to drill, nothing to call an electrician for. Drive something other than a Tesla? Sundial speaks OCPP — the open standard your smart wall charger already uses — so it manages charging at the charger instead of the car.
- ✓ Tesla EVs, Wall Connectors, and Powerwalls
- ✓ SolarEdge & Enphase inverters
- ✓ OCPP wall chargers — Wallbox, Emporia, ChargePoint, and more — for any EV brand
- ✓ More integrations shipping monthly
The car connects in three taps.
Tesla? Sign in with your Tesla account, pick the car, flip the toggle — Sundial sees the EV, solar, grid, and battery through one connection. Anything else? Point your OCPP wall charger at Sundial from its settings app and it's managed the same way — no car account needed.
If you have it, we probably talk to it.
Sundial works through manufacturer APIs over the cloud. No new metering hardware, no new wall connector, no firmware fights with your installer.
Solar-first, never solar-stranded.
Live energy status
One glance, whole home. Solar, battery, home, grid, and car — live kilowatts on one card, with idle devices dimmed so the numbers that matter stand out.
See where your solar went
Hour by hour, watt by watt. The energy flow chart splits every hour of production between your EV, your home, and your battery — plus a forecast curve for the rest of today.
Every EV, not just Tesla
Drive a Rivian, Ioniq, Bolt, or anything else? Sundial controls OCPP wall chargers like Wallbox, Emporia, and ChargePoint directly — no car account needed. Tesla drivers keep full vehicle-level control.
Charge scheduling
Cheap-hours insurance. Set weekly grid top-up windows (say, 12–4 AM at 32A) so the car is never short on a cloudy week — Sundial shows exactly how many kWh each window adds.
Sell solar when it pays most
Two windows, your rules. Avoid-hours pauses grid charging when rates spike (4–9 PM), and Sell-at-peak pauses solar charging so your surplus exports to the grid during your best sell-rate hours. Sundial charges around both.
Charge now, when you need it
Road trip in an hour? One tap overrides everything and fills the battery at full speed. Flip back to Auto when you're done — Sundial takes it from there.
Things people ask before signing up.
Do I need to install anything?
No. Sundial connects through APIs to your existing Tesla, SolarEdge, or Enphase setup. There's no extra meter, no extra wall connector, and no electrician call. If your gear can talk to its native app, it can talk to Sundial. If you're connecting an OCPP wall charger instead of a Tesla, you'll point the charger at Sundial from its settings app — a few minutes, no hardware changes.
How much will I actually save?
Most users save about $50 a month. Your number scales with how much you drive, your TOU rate, and how much daytime solar you currently export — an EV owner in PG&E or SCE territory exporting 60%+ of their daytime solar lands around there. Savings are computed against your actual utility tariff — NEM 3.0 export rates, not hand-waving — and projected on your dashboard once we have a few days of data.
Does this work without a Powerwall?
Yes. Powerwall makes the math richer — but you can use Sundial with just solar + EV. The app simply skips the battery-priority logic and routes everything to the car when there's surplus.
Do I need a Tesla?
No. Tesla vehicles get direct control, and every other EV works through an OCPP-compliant wall charger (Wallbox Pulsar Plus, Emporia, ChargePoint, and others). Sundial manages the charger itself — no car account needed.
Which chargers are supported?
Any OCPP-compliant smart wall charger. The Wallbox Pulsar Plus is our most-tested model, with Emporia and ChargePoint chargers also supported — Sundial starts, stops, and adjusts charging power to track your surplus solar. See the full list under Compatibility.
What happened to ChargeHQ?
ChargeHQ shuts down on September 7, 2026. Sundial is a US-built alternative — solar-surplus charging for Tesla and OCPP wall chargers, with NEM 3.0 savings tracking. See our migration guide.
What if I'm grandfathered into NEM 2.0?
Honest answer: the savings are smaller, because your export rate is closer to retail. You'll still come out ahead — Sundial avoids round-trip losses and lets you control charging during peak windows — but the killer math is for NEM 3.0 customers.
Is Sundial free?
Yes — Sundial is free to use. Connect your car or charger, set your charging policy once, and start keeping more of your own solar. No credit card, and no charges of any kind.
Is my Tesla data safe?
We use Tesla's official Fleet API with OAuth — same security model as the Tesla app. We never store your Tesla password (we never see it). You can revoke access anytime from your Tesla account.
Keep every kilowatt you make.
Connect your car — Tesla directly, or any EV through your wall charger. We'll link your gear, project your savings, and start the automation.
Start free →