corn18
Village Idiot
- Joined
- Sep 9, 2021
- Messages
- 674
I am going to install an MPII and was looking at my inverter precharge circuit. As it is wired now, the precharge applies power to all DC circuits when I push the button. Not sure if that is good or bad. I could add a cutoff switch on the invert + wire and put the precharge output on the inverter side of that. With the cutoff switch in the off position, that would only precharge the inverter and not power anything else. The procedure to power up would be:
1. Disconnect inverter
2. Turn on main DC breaker
3. Precharge inverter
4. Connect inverter
I could add the two position cutoff precharge circuit that is oft cited on here, but I don't like the failure mode of forgetting to switch it from Pos 1 to Pos 2.
With no cutoff on the AC out from the MPII, I am wondering if this will work. I never turn the MPII off so it will try to power the AC out when I am precharging.
Appreciate your thoughts.
![DC wiring 290RL victron.jpg DC wiring 290RL victron.jpg](https://diysolarforum.com/data/attachments/71/71774-e396981a97c099fcb0054ed2e53cee6c.jpg)
1. Disconnect inverter
2. Turn on main DC breaker
3. Precharge inverter
4. Connect inverter
I could add the two position cutoff precharge circuit that is oft cited on here, but I don't like the failure mode of forgetting to switch it from Pos 1 to Pos 2.
With no cutoff on the AC out from the MPII, I am wondering if this will work. I never turn the MPII off so it will try to power the AC out when I am precharging.
Appreciate your thoughts.
![DC wiring 290RL victron.jpg DC wiring 290RL victron.jpg](https://diysolarforum.com/data/attachments/71/71774-e396981a97c099fcb0054ed2e53cee6c.jpg)
Last edited: