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If you have a 200A main panel with a 100A feeder to the Gateway, then you have to meet one of these two limits: (a) the other breakers (excluding...
Vines correctly predicted the problem when he said: You have a SC2040M200C panel, which hasn't been tested with a 200A 4 position plug-in...
Ask them "why?" and to see the one line diagram. Earlier comments on info on your meter/main still apply. Cheers, Wayne
If money is your limiting resource, then that's not an efficient choice. Go with the smaller inverters. If roof space is your limiting resource,...
Don't just agree without an explanation. Wait to hear from Tesla. Or post the make and model of your meter/main and a picture, maybe we can...
To avoid that scenario, typically the interconnection application is submitted, and conditional approval from PG&E obtained, before the work...
P&GE gets to review the design before they grant PTO. Part of applying for the interconnect includes submitting a 1 line diagram of the...
That's right, and that's the safety reasoning behind the requirement. Experienced electricians at the time the requirement was passed often had...
Yes, the requirement for common manual disconnect on breakers serving a MWBC (where two circuits on opposite legs share a common neutral) is less...
Just to clarify, common trip is an internal connection and implies common disconnect when manually operated. The purpose of a handle tie is to...
While a 3.8 kW and 7.6 kW units might share some labeling, one would expect an inverter unit to have an additional label clarifying if it's the...
That part is correct (under the 2017 NEC). That part is also correct, if you use a configuration of service equipment that includes a panel that...
For what it's worth, that's actually correct, as far as the 2017 NEC, in force in California. It is only with 2020 NEC and its recognition of...
There's no question those are normal breakers subject to the 125% continuous load factor. There are special breakers called "100% rated" where...
That's not correct. See NEC sections 215.2(A)(1)(a) (minimum feeder size), 215.3 (overcurrent protection), and 230.42(A)(1) (service-entrance...
That's only true for continuous loads. In the above tally, only the EVSE is a continuous load. And while it makes sense for the EVSE to be...
Don't forget the personal utility of avoiding the unpriced externalities caused by using grid power. The utility (as in utility function) payback...
California has not yet adopted the 2020 NEC. The 2017 NEC was adopted January 1, 2020, so I'm guessing the 2020 NEC will be adopted at the...
No exactly, but it's a reasonable proxy. I believe LRA is literally what the current would be if the driven load suddenly locks up and the motor...
OK, a few points: - Consider spending some money on air sealing and insulating to allow for a smaller A/C unit. - Consider a heat pump to...
Not following this thread, but I just wanted to be clear that I don't have a construction company. I'm a full time owner-builder-designer-etc...
This. Find an electrician who will install the HPWC on the panel in the OP. Apparently that means finding someone sufficiently educated about PV...
Looks good. A minor point that may have been taken care of later, but was not in the photos posted: the conduits that go through the wall from...
They have? I'm not aware of that. I'm under the impression that you are allowed to charge from the grid, or discharge to the grid, but not both....
That's absolutely true, and a person knowledgeable with simple electronics could easily spoof the CTs to get the Powerwalls to export to the grid....
I don't quite follow--the hardware is capable of exporting to the grid. The only thing stopping it from doing so is software. Cheers, Wayne
So, I'm not following this thread very closely. But a little reading of Rule 21 and the NEM2 tariff tells me the following (where I may be...
The information a PG&E representative gave me 2.5 years ago, and which may not be accurate, was that NEM-MT vs NEM-PS was a billing issue, not a...
I have only 2 Powerwalls. The interconnection agreement I signed 2.5 years ago was Form 79-1193 "Agreement and Customer Authorization Net Energy...
That proposal also requires upsizing 3 feeder segments (unless they happen to oversize them already), so it is definitely more work than getting a...
If I recall, your current plan is to have one 200A service with (1) 11.4 kW inverter and (3) Powerwalls, and another service with (1) 11.4 kW...
Yeah, so if the AHJ won't allow Tesla to use 2020 705.13 early, then Tesla will have to choose one of the two solutions I described. That may be...
Likely it was an existing meter main, they pulled all the loads out, and using a 100A branch breaker was the easiest way to connect to the panel...
The drawing as shown, with a 7.6 kW inverter on a 40A breaker, is NEC compliant. You have a 100A feeder, with three connections: 80A continuous...
You could totally add additional current through the solar CTs, and spoof the Gateway into thinking there is more solar production than there is....
I don't believe that's correct. Per the Interconnection Agreement I signed with PG&E for NEM with Paired Storage not more than 10kW, the only...
That's plausible, if the Gateways have some way of communicating with each other. When grid connected "charging from solar" just means deciding...
Right now it looks like all your loads are supplied from (2) 200A panels, no other loads? Have you considered the following option: - Set a new...
I'm saying two things: 3 years ago regular SGIP didn't care about how the batteries were charged, just that they are sufficiently frequently...
Yeah, that is what I suggested. How did you go from "SGIP and non-SGIP batteries have to be segregate for reporting purposes" to "all solar needs...
I'm not super familiar with the terminology, so I just meant a module that would lock out a heavy load when there's no grid power, to avoid...
FWIW, that may be true, but you are the only source I have for that. On the other hand, I haven't considered the question before. At least under...
Well, the load shedding modules may be used to reduce the calculated carried load to under 96A. And the requirement for sizing generators on an...
With an ATS, you need a load calc to show that the connected load does not exceed the available alternate source power. A manual transfer switch...
I haven't proposed that. I'm not sure why, it's the idea I like best so far (if load calc works out). Cheers, Wayne
2 homes? Do you mean (2) 200A feeders from your meter? With 5 Powerwalls behind one Gateway on one 200A feeder, you could still use the transfer...
Have you considered just having the 5 SGIP Powerwalls? That would be much simpler. I haven't heard of this need to segregate, I wasn't aware...
I assume the automatic transfer switch has a delay for the generator to start up? If your load calc is under 200A, then you could do the...
Can you clarify a couple things for me: - Are the existing transfer switches for the generator automatic or manual? - You're generator is 22 kW,...
Then your inverter is clearly connected to the grid, and Rule 21 requires you to get a new interconnection agreement with PG&E. You would be...