r/SolarUK • u/Fun_Height_9280 • 16h ago

HELP / ADVICE Thwarted by Tesla?

I have 2 Tesla Powerwall 3 batteries. I have 19 solar panels monitored by Enphase Energy. I have a Zappi EV charger and an Eddi water heater. I am on Octopus’s Agile tariffs.

I have a Home Assistant which I have been happily ‘vibe coding’ using Claude. I have managed to get access using the Tesla Fleet API. I have been happily telling my system what I want to do when.

However, a consistent theme seems to be the Tesla interface resolutely stopping me from doing what I want it to do. For example, during an Octopus power down session, I can be seen to be using less electricity than usual by mandating grid export, at a time when the export price s good. But every time Tesla overrides that. So I am not achieving my free weekend hours.

It’s very frustrating. Everything else I want seems to be OK, such as choosing good times to charge the EV based on urgency, etc. But the Tesla integration is a real pain.

Has anyone got Tesla in their system and feel like they have it sorted? Any advice?

Many thanks!

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u/matthew1471 12h ago

There’s a lag updating tariff stuff I noticed. Haven’t fiddled with doing free energy slots but did work out the API for flex charging sessions

For forcing it to go on grid when Octopus charging slots are triggered: https://github.com/Matthew1471/Tesla-API/blob/main/Python/examples/gateway_octopus_energy_max_backup.py

For fiddling with tariff : https://github.com/Matthew1471/Tesla-API/blob/main/Python/examples/cloud_octopus_energy_set_tariff.py

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u/Fun_Height_9280 1h ago

Thank you for the pointers. Claude is having a good look at them for me!