Charger for 21s lifepo4 50ah battery packs

[Philosoraptor]

I bought two 21s lifepo4 packs off battery hookup and didn’t give much thought to sourcing a charger. I’m finding it a lot harder than I expected. I need something around 76.65 and all I have comparable is a 20s li-ion charger, but that puts out to 84v.

Any recommendations?

 

[amberwolf]

How much current are you looking for?

If you're willing to use power supplies rather than chargers (meaning they don't autoshutoff below the final tiny current at end of charge), there are Meanwell LED PSUs that could be used. They make some that are high enough voltage to use singles of, or you can series a couple lower voltage ones like the HLG series. They're adjustable to some degree for boht current and voltage depending on model option chosen, so you can pick a pair that are close to what you want and adjust up/down from there.

Other people are using telecom PSUs; there's at least one big thread for them here.

 

[Zambam]

They do make 21S LiFePo4 chargers (up to 24S). The only size they don't seem to make is 22S LiFePo4 (what I have) so I have no choice but to use an adjustable power supply.

https://www.aliexpress.us/item/2251832687647963.html?spm=a2g0o.productlist.main.3.216c7689SYgszi&algo_pvid=0af22a13-b42c-4f9c-adba-cb091f994eb4&algo_exp_id=0af22a13-b42c-4f9c-adba-cb091f994eb4-2&pdp_ext_f=%7B%22order%22%3A%227%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%2150.08%2139.06%21%21%2150.08%2139.06%21%402101efeb17466219575515941e7596%2165529406106%21sea%21US%213042880182%21X&curPageLogUid=5vHSCYWIdbiW&utparam-url=scene%3Asearch%7Cquery_from%3A