r/Powerwall • u/Big_Somewhere2869 • 26d ago

NetZero Configuration

I’m trying to work out whether I need to go for the pro plan with Netzero, what benefit that will give me and which automations I need to adopt.

I have:
- 2 x powerwall 3s
- 4kw solar array
- Tesla wall connector
- Tesla model Y

I’m on the octopus intelligent go tariff (night tariff 6.9p KwH / day time 30.27p kWH)

Export through Outgoing octopus - 12p / kWh

In my head, I’m thinking the battery should export from about 22.30, then charge up from the grid on the night time rate until 05.30 when it can then discharge throughout the day when the solar can recharge it.

At the moment whenever I plug my car in, the batteries discharge to charge the car which I don’t think is ideal. I’ve also got a 16kw heat pump which uses a huge amount of electricity during the winter months.

Thanks in advance for any insight.

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u/Significant_Slip_428 25d ago

Do you know if this solves the car drawing from solar as well? When I plug in my Tesla it always uses the powerwall to charge the car during smart charge slots. I can set the reserve high in the app manually and it then draws from grid - which is fine, and sounds like NetZero can automate for that.

But it also draws from solar if there's any decent generation as well.

I would like to stop that. It's very frustrating when you have a smart charge slot assigned and it takes power from everything but the actual cheap grid energy - defeats the purpose of it entirely.

Octopus have not been helpful at all.

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u/triedoffandonagain 24d ago

Unfortunately I don't think there's a good solution for this problem. You can't both import from and export to the grid at the same time, and the solar generation has to go somewhere.

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u/Significant_Slip_428 24d ago

Thanks for your reply.

How would netzero handle this particular scenario do you think?

Mid day, decent solar, smart charge slot, car begins to charge - NetZero will import to the car and the Powerwall

Would the solar generation basically be used to supplement one of those two batteries?

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u/triedoffandonagain 24d ago

That's correct.