This shows that SC12L200S panel with 6 spaces to be a Main Lug Only panel which I do not recommend for a service panel.
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400A main panel recommendations?
- Thread starter victir
- Start date
This shows that SC12L200S panel with 6 spaces to be a Main Lug Only panel which I do not recommend for a service panel.
It's almost as if I don't know what I'm talking about...
I'm certainly ok with that. Nor do I mind paying more for a meter breaker only panel like the CQRA200 Wayne pointed to. I just want to do things right.
To recap:
Stick with the SC816F200PS chosen by my electrician, put a HOM2200BB on the distribution bus for the subpanel and put nothing else in there to meet the 100% rule. That should be effectively the same as having a meter breaker only panel and should allow for easy upgrade to PV/batteries in the future by putting something like a Backup Gateway (or whatever) between the meter and the subpanel.
Is that all correct? I don't want to garble this up and relay poor information to my electrician...
You got it, that leaves all your options open, it's quite a flexible panel.
Just looking again, and the panel selected is solar ready with a 225A bus, so you have a small headroom to put a non-backup circuit or 2 in the main panel up to 25A on each phase.
If using the backup switch, you might want a few more slots down the road in that main service panel.
With the backup switch, there is no need to reconfigure the service panel and relocate loads. All the loads and all the generation sources land right into the main panel. This is why you may need more slots for a design with the backup switch, though you could always add another subpanel from the breaker or subfeed lugs to capture these additional loads.
Not following you, the Backup Switch (vs the Gateway) makes it easy to backup up all the loads on the service, but it doesn't change any of the interconnection limitations in (2017) 705.12(B). So I don't see how it has any bearing on any of the prior discussion.
Cheers, Wayne
Ok, but all my loads are already in a subpanel, would I need to move them to the main panel if I got the backup switch?
The subfeed that feeds the subpanel where your loads are located, needs to land in the main panel. This is effectively the same as landing directly in the main panel.
Sorry I didn't catch that most of your loads were already in a subpanel not near the MSP.
What I was trying to say was that when a backup switch is used in the MSP, the MSP loads to be backed up can stay just as they are, assuming whole home backup.
When using the GW2 approach, you have to reconfigure the MSP to relocate backup loads to another panel unless the MSP is already a main breaker only combo panel, or a separate meter socket only with separate main distribution panel.
Only if the generation can be landed in that MSP in compliance with 705.12(B).
So for the case of a 200A bus MSP (Main Service Panel) with a 200A main breaker, that only allows 32A (continuous) of on-grid inverter current to land in the MSP. Which works for one PW+, or one PW plus up to 8A of PV inverter. If you want to interconnect more, you either need a larger MSP bus or a smaller main breaker.
Cheers, Wayne
I dont disagree with anything you said.
I suspect by the time this comes to fruition the 2020 NEC is adopted and with it PCS control over the backfeed.
I’m not PG&E but this is exactly how Tesla installed my Powerwalls with whole house backup. There are times when my car is charging, the clothes dryer is running, the oven is going, and the AC is going full blast. This is more than 110 A and there’s plenty more capacity left on the panel. I’m on a 100 kVA subsurface transformer shared with 10 other homes but at this point the bottleneck would be the distribution transformer and not the panel.
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