Hi,
I am in a similar situation just up the road in Walnut Creek. I would like to have a system with panels, an EV level 2 charger (preferably the Tesla charger but I’ll settle for my existing 30a dryer outlet) and a powerwall.
My contractor is telling me that PG&E will refuse to install any size system with both elements on my existing service because the battery alone is more than my 100a service can handle (requires a 30a breaker and PG$E limits a 100a service to a 20a breaker for backflow.) I could switch to the LG batter but still could not have an EV charger. They tell me PG$E will not allow an upsized subpanel/bus with a derated main as in your diagram.
How did you get this through?
FWIW- My original system was 25 Panasonic 330w panels with the powerwall. This was oversized for my needs but the max I could fit on the roof. It was estimated to produce about 11-12K kWh/yr. I currently use about 7-8K/yr and added a model 3 on top which I fully charge twice a week so I estimated about 3K kWh/yr for that.
Add the new EV TOU pricing and I wanted some head room. EV-A is going away soon to be replaced by EV-2a. Which will look like this: peak 4-9pm= $.46/kWh, part peak 3-4p and 9-12p = $.35/kWh and the faceslap: off peak 12a-3p =$.15/kWh...
Good news for EV drivers who work from home and are without solar, but seems specifically targeted to harm solar producers... 3:1 cost ratio between production hours and evening use. Thus my interest in the battery.
So currently choosing between paying for the trenching and getting the full system, or downsizing panels and finding a way to have a smaller system while keeping the battery and a 50a breaker for the Tesla charger.
So
@who177e: do you mind sharing any permit #s, correspondence with PGE for approving this system, or system drawings? It my help me prove my case to the AHJs to show prior approval.
Also, I take it that you did NOT do the trenching, but did PG$E give you any indication of what they would pay for? We’re they prepared to do the conduit and feeder?
Does anyone have a link to the CPUC regarding PG$E providing these service upgrades? A link to the language of the decision or something other than the vague description on PG$E’s website would be handy.
Thanks!