For EV owners with rooftop solar

Stop selling your sunshine back to the grid for pennies.

Under NEM 3.0, the value of selling your excess solar back to the grid collapsed by roughly 95%. The price you pay to buy it back at night didn't budge. If your EV is charging from the grid while your solar is running, you're losing money — every sunny day.

Start free See how it works →

✓ No card needed · See your savings free

Go unlimited for $7.99/mo · Cancel anytime

$15–$60/mo Typical NEM 3.0 savings

4 min Setup, no installer

Savings

$1.53

Today

$47.39

Savings

Charging from solar

17A → 16A 4.0 kW

Why it exists

Selling solar back to the grid is now the worst trade in your house.

NEM 2.0 export

~$0.30/kWh

What you used to get for excess solar.

NEM 3.0 export

$0.02–0.05/kWh

What the grid pays now. Down ~95%.

PG&E / SCE peak rate

~$0.50/kWh

What you pay to buy it back at night.

Sundial closes the gap by burning your sunlight at home — into the car — instead of selling it for pennies.

How Sundial fixes it

Three connections. One automation. Zero new hardware.

Connect your gear

Pick a policy

Drag two handles. That's the policy.

Charge range

Always charges50%

Excess solar90%

0%20%50%80%100%

Watch the bill drop

Savings update live on the dashboard. Cancel anytime if the math doesn't work.

$47.39 savings. Tracked to the cent, projected forward, and posted to your dashboard before you finish your coffee.

The control

One slider replaces your charging strategy.

Most apps ask you to set seven schedules. Sundial asks for two numbers. The slider is the policy.

Blue zone — Always charges A floor your car never drops below, no matter the weather.
Amber zone — Excess solar only Only charges when the sun is paying for it. Stops the instant surplus runs out.

Charge range

Always charges50%

Excess solar90%

0%20%50%80%100%

Max savings

Setup, in plain English

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.

✓ Tesla EVs, Wall Connectors, and Powerwalls
✓ SolarEdge & Enphase inverters
✓ More integrations shipping monthly

Sundial Connect Your Devices screen on the Solar step, showing Tesla connected and Connect buttons for SolarEdge and Enphase

Compatibility

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.

Cars

TESLA

Solar & Battery

TESLA POWERWALL

solaredge

enphase

Coming soon

HYUNDAI

KIA

Ford

RIVIAN

Wallbox

Emporia

Common questions

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.

How much will I actually save?

It depends on how much you drive, your TOU rate, and how much solar you currently export. A typical Tesla owner in PG&E or SCE territory who's currently exporting 60%+ of their daytime solar tends to recover 10–20× the $7.99 subscription in the first month. We project your specific number on the 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.

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.

How does the free plan work?

Sundial is free for the first 10 smart-charging sessions every month — enough to see the dollars start adding up. Past that, the dashboard keeps working but your car charges however Tesla would have charged it. Upgrade to Sundial Pro at $7.99/month or $79.99/year to lift the cap. Cancel anytime in the app — no calls, no retention scripts. If we're not saving you more than the subscription cost, we don't deserve it.

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.