Frank Smith
New Member
- Joined
- May 11, 2021
- Messages
- 19
I installed lithium battery because my lead acid batteries were failing.
I have utility power available but don’t sell back to the utility. My system consist of 3400 watts of panels, 60 amp Renogy MPPT charge controller, a 4KW Schneider 4048 inverter and the 48 volt 280 AH lithium battery. The charge controller and the inverter are connected to the battery.
I can easily switch between inverter power and utility power through a relay. I programmed an arduino to control the system. This works by the battery voltage. When the battery voltage drops to 48, the system switches to utility power. If the voltage rises above 50, it switches back to the inverter.
This worked well with the lead acid batteries, but will it work with lithium?
What happens if the BMS detects that the batteries are overcharged or at the limit? Does it open the circuit to the batteries until the sun goes down and the voltage from the charge controller drops?
If it opens the circuit to the batteries, will the charge controller feed the inverter with the batteries temporarily disconnected? Or do I need to arrange to shut down the charge controller if the voltage gets too high?
I have utility power available but don’t sell back to the utility. My system consist of 3400 watts of panels, 60 amp Renogy MPPT charge controller, a 4KW Schneider 4048 inverter and the 48 volt 280 AH lithium battery. The charge controller and the inverter are connected to the battery.
I can easily switch between inverter power and utility power through a relay. I programmed an arduino to control the system. This works by the battery voltage. When the battery voltage drops to 48, the system switches to utility power. If the voltage rises above 50, it switches back to the inverter.
This worked well with the lead acid batteries, but will it work with lithium?
What happens if the BMS detects that the batteries are overcharged or at the limit? Does it open the circuit to the batteries until the sun goes down and the voltage from the charge controller drops?
If it opens the circuit to the batteries, will the charge controller feed the inverter with the batteries temporarily disconnected? Or do I need to arrange to shut down the charge controller if the voltage gets too high?