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Disconnect from grid and power up system before interconnection?

DrLegoHair

Member
Jun 16, 2017
92
520
Orlando, FL
My utility is taking forever to approve my interconnection application and I am dying to test out my system (solar+pw). Is there any problem with disconnecting from the grid (turn off main breaker on meter) and powering up the system? I don’t see why there would be but perhaps my exuberance is clouding my judgment
 

power.saver

Grid Specialist
Supporting Member
Mar 4, 2018
603
637
Arcadia, CA
It probably won't start if you disconnect the grid first, then turn it on. You would have to turn it on first, then disconnect the grid so it goes into island mode. Make sure you have enough solar production to cover your house loads and charge the batteries. If the batteries are at a low state of charge, it may shutdown as soon as you disconnect.
 

DrLegoHair

Member
Jun 16, 2017
92
520
Orlando, FL
It probably won't start if you disconnect the grid first, then turn it on. You would have to turn it on first, then disconnect the grid so it goes into island mode. Make sure you have enough solar production to cover your house loads and charge the batteries. If the batteries are at a low state of charge, it may shutdown as soon as you disconnect.

I actually went ahead and did this. I made sure the batteries were on, then disconnected the grid and finally powered up the inverter.

Been running great all day!
 

charlesj

Active Member
Oct 22, 2019
1,230
267
Monterey, CA
Did Tesla install the solar panels and the PW at the same time? Did you already have a smart net meter that runs backward and just waiting for power company inspection?
 

DrLegoHair

Member
Jun 16, 2017
92
520
Orlando, FL
Did Tesla install the solar panels and the PW at the same time? Did you already have a smart net meter that runs backward and just waiting for power company inspection?

They installed everything at the same time. I am waiting for the utility to come out and install the new smart meter and approve the interconnection. The city/county inspections are already completed.
 

charlesj

Active Member
Oct 22, 2019
1,230
267
Monterey, CA
They installed everything at the same time. I am waiting for the utility to come out and install the new smart meter and approve the interconnection. The city/county inspections are already completed.
Thanks. then your meter cannot run backwards. Not sure what could have happened to the meter even for that short duration you tested
the system.
Did Tesla hook you up to their app? Did it show anything when you tested the system? How long was the test? :)
 

DrLegoHair

Member
Jun 16, 2017
92
520
Orlando, FL
No,

I disconnected the main breaker so there is no way for power to flow back into the meter. I have been running all day, 12 hours now, like this and the app treats it like a grid outage. It would probably be illegal to do this while hooked up to the grid before the interconnection is approved.

For now it’s running like an off grid system.
 

jjrandorin

Moderator, Model 3, Tesla Energy Forums
Nov 28, 2018
10,267
11,613
Riverside Co. CA
For now, you don't need the grid... :D

What happens if the utility comes by to perform their work while the OPs system is in this state? Will they complete their work anyway, or will they not perform their work because the system is already running (even if off grid)?

I dont think the utility makes an "appointment" to come do their part of the work, since most utilities have the right to come on your property to service the meter, so they dont have to get your approval to come do their work....
 

DrLegoHair

Member
Jun 16, 2017
92
520
Orlando, FL
What happens if the utility comes by to perform their work while the OPs system is in this state? Will they complete their work anyway, or will they not perform their work because the system is already running (even if off grid)?

I dont think the utility makes an "appointment" to come do their part of the work, since most utilities have the right to come on your property to service the meter, so they dont have to get your approval to come do their work....


You’re absolutely right. I just wanted to test it a bit over the weekend. I’m shutting it all down tonight :)
 

d21mike

Active Member
Aug 28, 2017
1,099
722
Torrance, CA 90503
When Tesla finished and did the full system test he said I will just leave it running. Dats later when Tesla met City inspection he turned off Solar but left Batteries active.

I said okay.
 

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