Grounding with 12000XP

[Huskeyf]

I am about to install a 12000XP temporary to a home with an inside panel (unbonded) that is fed from the outside with a Outdoor Combination Main Breaker/Meter Socket Load Center. The Meter is not installed at this point and therefore no power from this source. The bonding does occur at the combo load center outside. I have attached pictures for reference. I will possibly run grid power from a separate building (separate meter) with its own ground bond if necessary for back up charging.

1. So running off grid completely (setting the inverter to unbonded), I question if it is necessary to leave the main breaker from the inside panel open for grounding purposes.
2. In the case I need he grid power (from the separate building, how would I go about the proper bonding settings?
3. For testing purposes, can I use only one EG4® WALLMOUNT INDOOR 280AH LITHIUM BATTERY, knowing not to overload the battery with too many circuits?

Outside panel with no meter:

Inside Panel

 

[FilterGuy]

So running off grid completely (setting the inverter to unbonded), I question if it is necessary to leave the main breaker from the inside panel open for grounding purposes.

NO. if the main panel is bonded, the only wires that need to be connected are neutral and ground.

In the case I need he grid power (from the separate building, how would I go about the proper bonding settings?

This is a weird area of the code. Since it is a separate building, the code wants a new NG-bond and a New ground rod at the 2nd building.
I would need to know more about how you plan to hook up the power from the other building to say anything more.

For testing purposes, can I use only one EG4® WALLMOUNT INDOOR 280AH LITHIUM BATTERY, knowing not to overload the battery with too many circuits?

Yes.... but.... you also want to be careful about the C-Rate on the battery. If you discharge the battery at greater than 140A for any length of time, you could start impacing the life of the battery.

 

[Huskeyf]

NO. if the main panel is bonded, the only wires that need to be connected are neutral and ground.

This is a weird area of the code. Since it is a separate building, the code wants a new NG-bond and a New ground rod at the 2nd building.
I would need to know more about how you plan to hook up the power from the other building to say anything more.



Yes.... but.... you also want to be careful about the C-Rate on the battery. If you discharge the battery at greater than 140A for any length of time, you could start impacing the life of the battery.

Thank for the quick response.

1. For AC input, I would like to use just 30 amp maximum power to only charge batteries. Is it possible to limit the power input from grid, or if not, is it possible to use the gen input and set to 30 amp max input from the separate power source ( not a generator, but a separate building feed with a 30 amp breaker on it)?
2. How would I set up the 12000 to do this? I know I would like to use the Self Consumption mode. Any other tips would help.

 

[FilterGuy]

Thank for the quick response.

1. For AC input, I would like to use just 30 amp maximum power to only charge batteries. Is it possible to limit the power input from grid, or if not, is it possible to use the gen input and set to 30 amp max input from the separate power source ( not a generator, but a separate building feed with a 30 amp breaker on it)?
2. How would I set up the 12000 to do this? I know I would like to use the Self Consumption mode. Any other tips would help.

Hmmmm I don't know of a way to do this with the 1200XP.

If your loads are such that they never exceed the 12000XP capacity and your battery size is large enough that you never drain the batteries to far it should work, but I would still put a braker on the line to make sure the line does not get overloaded.

 

[killercarver]

Thank for the quick response.

1. For AC input, I would like to use just 30 amp maximum power to only charge batteries. Is it possible to limit the power input from grid, or if not, is it possible to use the gen input and set to 30 amp max input from the separate power source ( not a generator, but a separate building feed with a 30 amp breaker on it)?
2. How would I set up the 12000 to do this? I know I would like to use the Self Consumption mode. Any other tips would help.

1. Yes, 12000XP can limit AC power used to charge batteries. The amperage set appears to refer to the charging amperage, not the AC amperage when I tested this. I just posted info in another thread (https://diysolarforum.com/threads/12000xp-low-soc-settings-help.97272/#post-1323757).

Agree with @FilterGuy that ideally you should size battery capacity correctly (which yes, can get expensive); but 12000XP also has features to stop battery discharge and (I haven't tested this next part) to swap to the grid power if battery gets too low...