Images from inside a Tesla Powerwall 2

Images are care of Chris Topher on DIYPowerwalls on Facebook

Looks close to the Tesla Powerwall two with twice as many batteries

Its seems to include a 3phase transformer - for AC charging? Doesn't make much sense to me as it should be powered by PV. If there's AC why should i charge it with it - losing energy on inefficiency?

paddy72 said:

Its seems to include a 3phase transformer - for AC charging? Doesn't make much sense to me as it should be powered by PV. If there's AC why should i charge it with it - losing energy on inefficiency?

Click to expand...

I am guessing it's an inline inverter, aka a hybrid inverter. So the AC mains comes into the unit, and if the power goes out, it switches over to battery <10ms. When restored, switches back.
Or, you can use this for load balancing between PV/Mains. 10% mains, 50% PV, 40% to charge battery

paddy72 said:

Its seems to include a 3phase transformer - for AC charging? Doesn't make much sense to me as it should be powered by PV. If there's AC why should i charge it with it - losing energy on inefficiency?

Click to expand...

yes it is what is called an AC coupled battery. The idea behind it is that the battery charges off the AC(from solar or grid) and then can run the house during a power outage or during high price times. The main use case I see for this type of system over a hybrid string inverter is when solar has been installed using microinverters as is very common here in the USA due to fire safety rules when panels are on roofs. Yes there is some extra efficiency loss so I don't plan to use it personally

Hi

wonder if anyone could help me out ... need inverter from one of these

View: https://www.reddit.com/r/Powerwall/comments/yt1i24/faulty_powerwall2_parts_needed/


thanks
Rudi