all home built solar system

Author	Message
Murphy's friend Guru Joined: 04/10/2019 Location: Australia Posts: 674	Posted: 10:11am 23 Apr 2021       Agreed that this idea is meant for sealed AGM batteries, which is the type poida shows in his picture and the post was meant for his set up. One thing about those 12V lithiums the video mentions, which have a BMS built in. I use these in my caravan, 2 x 12v/120Ah in series for a 24V system. Now, there is a great variety of those 12V lithium batteries on the market and some I saw advertised on ebay have a rather poor performance. I would suggest choosing one that can handle up to 100A charge/discharge, some of the ones I saw have less than half of that and are, consequently, cheaper. For a home battery bank you want some decent instant current discharge capability and also the battery can accept a decent charging current. At least all the current the charging method (and future expansions of it)can throw at the battery bank. I have seen 90A flowing into my home 300Ah/48V battery bank and they just gobble it up. Momentary discharge currents would be higher than that if I start up some machinery.