Im looking to add my 24v 200ah Lifepo4 and charging to my existing FLA "12v"system in my boat.
300w Pv 3S (60+v) w mppt 100/15
48v wind generator w mppt 75/15
Both charging my 100ah 24v lifepo4’s
I thought about running the “streetlight” outs (on battery-life protect)
Into a 3rd mppt (75/15 mppt) for my FLA 12v existing system.
The reason is my radio and expensive inverters for it all run at 24v.
The streetlight function seems perfect as input to a 3rd mppt is +/-24v.
With an input select (either/or; pv or wind switch) for this 3rd mpptn whenever my lifepo4’s are charged it will send power to top up the FLA side of the system (starter battery etc).
Anyone see any issues with this
(Common ground for FLA system is 11-14.8v)?
Not sure how to use that common 12v FLA ground (volt step down?!?)…
Common ground: This means that both the 24V battery negative and the 12V battery negative are both connected together.
Whilst you could use an mppt for converting 24v to 12V, the Orion solution would be better. Mppt’s are likely to have a problem with input current not being limited, and this may cause problems when the device searches for a new max power which it does periodically. These can be programmed into CC or CV mode, which turns off this search. Orion is easier to use for voltage conversion, as this is what it is designed to do. Don’t use the load output of one of the other MPPT’s to drive it, but connect it via a fuse to the 24V positive busbar. Orions do have a control function that can be used to turn it on and off.