But having 2 power walls with a single 7 or 7.6kW inverter shouldn’t have been a problem, but the OP of that thread said that their power still went out even when they only had a single inverter on.
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
Can I have 1 powerwall with a 11.4kW PV system?
- Thread starter s.kuo
- Start date
That would depend on what the max generation for that 7.6 inverter is. Most people assume that it wont generate that much because all the panels dont point one way, etc. If their 7.6 inverter is hooked up to enough panels to produce >5kW continuous (which I believe it is, as I believe they have a ground mounted array), its the same issue.
PV generation >5kW continuous per powerwall is the issue. Its entirely possible for someone to have a 7.6kW inverter that never peaks above 5kW continuous for any appreciable amount of time.. that would be normal for a roof mounted system. It would be pretty unusual for a 11.4kW sized system to never generate more than 5kW continuous, though (the OP in this thread).
The max generation for a 7.6kW inverter isn’t going to be above 10kW, which is why I’m saying that something else must have been going on as well in the thread you linked if that OP’s power shut off when only using one of their inverters and 2 PWs.
I 100% agree with your second paragraph and am in agreement that 2+ PWs would be required for 11+ kW inverters.
Thats a good point, I just remember that specific thread for the issue. Maybe tag the OP of that thread for more info on it.
@zƬesla did you ever get a root cause as to why your power was dropping out when only running on one inverter and 2 PWs in the below thread? Or did no one dive into the root cause as adding a third PW solved the symptoms?
This thread has a TMC members experience with this. It was not 1 powerwall, but the situation was the exact same ("not enough powerwalls for amount of PV").
New PowerWall install woes
We just had had a 17.5kW PV array with 2 inverters (7.0 and 7.7) installed plus 2 PowerWalls. In testing off-grid/self-powered mode, we are seeing issues with the PWs. With both inverters on (14.7 total) and peak sun, the PWs keep shutting the inverters off. Even with just one inverter on and...teslamotorsclub.com
charlesj
Active Member
From his post 1
" the PWs keep shutting the inverters off. Even with just one inverter on and PWs mostly charged, we sometimes see the whole house lose power (clocks reset/etc) for a several seconds"
Power lost for a few seconds, not completely even though the app showed no power flow. Not sure what to make of that as he didn't say house power down until grid was back on.
No definitive answer. As the installer owned up to mis-designing our system and put in the third PW at no cost to us, we didn't push for an answer. Haven't seen the issue pop up again with the third PW, although there have only been a couple of outages since.
Similar threads
