Can't you just set the site export limit based on the loop impedance test? Then it would just be an issue for exporting and doing TOU arbitrage.
Cheers, Wayne
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- Thread starter jf64k
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Cheers, Wayne
OK, do you know if there is a technical reason for that? Possibly related to the "open loop response time" that the PCS has, which will briefly allow export in excess of the limit?
Cheers, Wayne
what are their instructions? my inverter (non-tesla, pre dating my powerwalls) has a nameplate power output of 5kw, so that's apparently why tesla set my export limit to 5kw. there was a brief time where i was exporting 10kw but after a few days i found that it was clamped at 5kw.
CrazyRabbit
Active Member
I’m good for +20 on impedance test
I’m guessing this is due to tesla using your transformer as a auto transformer when on grid!
Interesting note from this is PW supply/capacity is now finally available for 3rd party installers en mass. I agree that install labor will be high if any installer that already isn't busy enough already dealing with NEM3.0 orders and hooking all this up. Just not worth their time probably right now and NEM deadlines in CA at least.
btownalset
Member
Just a Powerwall. I already have the gateway and 2 batteries installed. Just adding a third. It is expensive but there is a 30% tax credit.
does adding additional storage require interfacing with PGE again? or is this something that can just be added in to an existing PW system?
trying to figure out if the electricians that did my main panel upgrade for tesla could just install one more PW. maybe they would know how to file the paperwork (if needed) even though technically they are not solar installers.
trying to figure out if the electricians that did my main panel upgrade for tesla could just install one more PW. maybe they would know how to file the paperwork (if needed) even though technically they are not solar installers.
Got to get another permit, which depending on what one wants to do , may no longer be legal!!
I thought my last 2 also had to get a PGE PTO, since I assume back feeding into the transformer needs to be verified is not
a safety issue, right ?
I would be surprised if you don't since an additional PW would increase the grid backfeed capacity significantly.
100% yes, if you add grid tied interactive inverters including powerwall they need to have permission to operate through PGE. The physical installation can be performed regardless but your utility needs to check the transformer capacity.
The reason is that after they are installed nothing stopping the homeowner from participating in a VPP program, and then all your battery inverters start pushing to the grid.
CrazyRabbit
Active Member
you know you want another powerwall!
are you still going down to one gateway? when will that be done?
I will be going with a permit and interconnection with PGE. I want to go that route because I am also on the VPP program, Adding batteries to existing solar doesn't push you out of your current NEM program.
Nope, still gateway. Could not get installer to make the change, even though I did all the technical work to prove it works. This is why do it right up front since adding or modifying after the fact might be impossible
Actually, from watching my Powerwalls being installed, it's just a matter of jumping the AC wires and control wires from the internal connectors to the other Powerwalls.
I put an order in to expand my 2 Powerwalls to 4. I'm already on whole home backup so I'm hoping install costs will be reasonable. I figure I might as well get ahead of the game here in NJ seeing what's happening to the rules and rates in other states.
but this is what i was trying to say in my other reply - i currently have two powerwalls and although that is capable of 10kw, during VPP events and normal "export everything" days my system only exports 5kw. i assume this is because it's what my solar inverter can export, and what was originally approved by PGE. if solar is still producing while the PWs are exporting, the sum of the two never exceeds 5kw.
i don't doubt that PGE would want some paperwork as all that's standing between me and overloading local transformers is software, but for whatever reason they signed off on 10kw of powerwall capacity and i'm still limited to 5kw max.
