Buggies Gone Wild Golf Cart Forum - View Single Post

Pat911 · 08-10-2021, 06:16 PM

Hi Mike,

As others have said, 50.8v is a flat 48v lithium battery. That voltage would have recovered a little so it probably got down to 48v before the BMS started protecting the cells.

Also, I’m not suggesting that you are as you haven’t confirmed it, but reinforcing that you CANNOT use a lead acid charger for lithium. Lithium batteries require a constant voltage, constant current (CV/CC) charger or power supply. Depending on the design and the CC setting, they can get quite hot but the incoming power cable shouldn’t, it should be rated to carry the required current. Due to the CC topology, The charger will get hot regardless of battery charge except when the battery is almost full, when it changes over to CV.

The discharge curve of LiFePO4 is very flat, so a voltage based state of charge meter is only good for telling you when your battery is full or flat. It is useless for anything in between. Best install one of these.

https://www.renogy.com/500a-battery-...xoC0UYQAvD_BwE

Cheers
Pat.

08-10-2021, 06:16 PM	#9
Pat911 Gone Wild Join Date: Dec 2020 Location: Melbourne, Australia Posts: 1,944	Re: 48v 100Ah Evoltion low battery voltage Hi Mike, As others have said, 50.8v is a flat 48v lithium battery. That voltage would have recovered a little so it probably got down to 48v before the BMS started protecting the cells. Also, I’m not suggesting that you are as you haven’t confirmed it, but reinforcing that you CANNOT use a lead acid charger for lithium. Lithium batteries require a constant voltage, constant current (CV/CC) charger or power supply. Depending on the design and the CC setting, they can get quite hot but the incoming power cable shouldn’t, it should be rated to carry the required current. Due to the CC topology, The charger will get hot regardless of battery charge except when the battery is almost full, when it changes over to CV. The discharge curve of LiFePO4 is very flat, so a voltage based state of charge meter is only good for telling you when your battery is full or flat. It is useless for anything in between. Best install one of these. https://www.renogy.com/500a-battery-...xoC0UYQAvD_BwE Cheers Pat.