Hi solar lovers!
I have the following system:
alternator -> starter battery (lead acid) -> [missing component] -> house battery (lithium) <- mppt charge controller <- solar
My starter battery is charged by the alternator, my house battery is charged by mppt controllers
To add redundancy I would also like to charge the lithium battery with a B2B charger, like Orion-Tr Smart DC-DC Charger Non-Isolated. However they are relatively expensive. I am wondering if I couldn't use a simpler DC-DC converter, like Orion-Tr DC-DC Converter and set the output to the lithium "float" voltage. I know it won't charge to 100% that way, but that's ok, its for filling up in the bulk stage.
I am pretty sure that setup wold work if either the mppt or the Dc Dc converter would be on. But what happens when they are both on and we are in absorption stage?
In this case
the mppt applies up to 14.4 Volt (Absorption)
the DCDC charger tries to apply 13.5 Volt (Float)
=> what happens to the DCDC charger when it's output voltage is lower than the battery voltage? Will it just stop charging? Or will it be destroyed?
Looking forward to your answers!
Thanks
Patrick
I have the following system:
alternator -> starter battery (lead acid) -> [missing component] -> house battery (lithium) <- mppt charge controller <- solar
My starter battery is charged by the alternator, my house battery is charged by mppt controllers
To add redundancy I would also like to charge the lithium battery with a B2B charger, like Orion-Tr Smart DC-DC Charger Non-Isolated. However they are relatively expensive. I am wondering if I couldn't use a simpler DC-DC converter, like Orion-Tr DC-DC Converter and set the output to the lithium "float" voltage. I know it won't charge to 100% that way, but that's ok, its for filling up in the bulk stage.
I am pretty sure that setup wold work if either the mppt or the Dc Dc converter would be on. But what happens when they are both on and we are in absorption stage?
In this case
the mppt applies up to 14.4 Volt (Absorption)
the DCDC charger tries to apply 13.5 Volt (Float)
=> what happens to the DCDC charger when it's output voltage is lower than the battery voltage? Will it just stop charging? Or will it be destroyed?
Looking forward to your answers!
Thanks
Patrick