rjwinz
Member
- Location
- Mankato, MN, USA
All,
I am putting together a battery backup system for certain circuits in my home, primarily for the steam boiler and a CPAP machine. I am not a licensed electrician. I did work for an REA and as an electrician many years ago. I try to keep abreast of code changes and have watched most of Mike Holt's videos.
The system is described as follows: Four (4) 230 amp 6 volt flooded lead acid batteries connected in series/parallel, yielding 460 amps at 12 volts. Batteries sit in a battery box which will be vented. Charger/Converter is 55 amp, #4 MTW to the batteries. Battery cables are 1/0 welding cable. Battery to Inverter cables are 1/0 MTW/USE-2/THWN-2 (90 deg. wire), rated 270 amps in free air (not in conduit or raceway). Positive lead goes to 400 amp switch (Blue Sea Systems) and then to 200 amp ANL fuse and then to Inverter. Inverter is a 12 volt input Xantrex, 1800 watts continuous.
I have two questions: 1) I want the Inverter output to go to a 6 QO breaker Square D box, from which I will wire in separate circuits feeding 15 amp outlots in various locations in my home. They will NOT be connected to the house wiring. The Inverter does not appear to have a hardwire option. Can I plug connect to the Square D box from the 15 amp GFI on the Inverter? Or, I could remove the 15 amp GFI and hardwire it.
2) How/where do I terminate the EGC? It will run between the charger/inverter/breaker box. The only place the grounding conductor will connect with the house will be at the steam boiler, as I will probably install a 2 pole toggle between the house wiring and the inverter output at the boiler disconnect. The house has a 200 amp main, 2 subpanels in the house itself and one in the detached barn/garage. I could run the EGC to one of the subpanel without much trouble.
Thank you for your attention.
Bob W. (rjwinz)
I am putting together a battery backup system for certain circuits in my home, primarily for the steam boiler and a CPAP machine. I am not a licensed electrician. I did work for an REA and as an electrician many years ago. I try to keep abreast of code changes and have watched most of Mike Holt's videos.
The system is described as follows: Four (4) 230 amp 6 volt flooded lead acid batteries connected in series/parallel, yielding 460 amps at 12 volts. Batteries sit in a battery box which will be vented. Charger/Converter is 55 amp, #4 MTW to the batteries. Battery cables are 1/0 welding cable. Battery to Inverter cables are 1/0 MTW/USE-2/THWN-2 (90 deg. wire), rated 270 amps in free air (not in conduit or raceway). Positive lead goes to 400 amp switch (Blue Sea Systems) and then to 200 amp ANL fuse and then to Inverter. Inverter is a 12 volt input Xantrex, 1800 watts continuous.
I have two questions: 1) I want the Inverter output to go to a 6 QO breaker Square D box, from which I will wire in separate circuits feeding 15 amp outlots in various locations in my home. They will NOT be connected to the house wiring. The Inverter does not appear to have a hardwire option. Can I plug connect to the Square D box from the 15 amp GFI on the Inverter? Or, I could remove the 15 amp GFI and hardwire it.
2) How/where do I terminate the EGC? It will run between the charger/inverter/breaker box. The only place the grounding conductor will connect with the house will be at the steam boiler, as I will probably install a 2 pole toggle between the house wiring and the inverter output at the boiler disconnect. The house has a 200 amp main, 2 subpanels in the house itself and one in the detached barn/garage. I could run the EGC to one of the subpanel without much trouble.
Thank you for your attention.
Bob W. (rjwinz)