Hi,
I have a new LiFePo4 battery that i need to fully charge up, but i dont have a suitable charger for it.
Can i use a regular battery charger (used for AGM) as input to a 100/20 MPPT charge controller (set up for lithium) to charge the battery?
asked
Can i use an old battery charger as input to MPPT for charging a LiFePo4 battery?
Apart from being non-standard use and so all bets off, I doubt it will work. Victron MPPTs will not start charging until input voltage is over actual battery voltage by more than 5V. If you try, at your risk.
Might be unconventional but needed a quick solution to charge some 12v LiFePo4s so am feeding a Victron 75 || 15 with a pair of 24 volt 8 Amp switchmode supplies wired in series. A hefty reverse polarity protection diode was added to each supply. Been in regular usage for months, no smoke.
The 75 || 15s Max charge current must be chosen to suit the capability of the supply.
As for supply voltage, you need +5v more than Vbat to wake up MPPT. I would not suggest using a battery charger as the supply. A 12v charger may not wake up MPPT. A 24v charger probably will but the charger and MPPT are going to chase each other around the ballpark.
