![]() Remember, these devices were originally designed around lead acid batteries. Most charge controllers and inverters operate in this voltage range. Just so we have the right terminology here.ġ4s fits "most" applications. A string is a bunch of packs connected in series. A pack in this instance is a group of cells connected in parallel. Fuses only protect a cell from within a pack. Especially if not having some sort of bms to monitor and balance the packs.įuses do not protect packs from each other. Even having 1 pack be 100mAh different than another could cause problems if you do full cycle charge/discharge often. You do want all series packs to have as equal as possible capacity as the others. ![]() There is even a bms for single cells, but that's only limited to over/under voltage and over current protections. If you go with 2s or higher, you will need a bms for balancing and monitoring. In other words, only 1 cell in series can be used without the need/warrant of using a bms, or balancing. The only way you can get away from that is to have a 1s string. I was making a reference to the fact that you seem to not want to balance. I was just going to use fuses to kill off the entire 14~16s1p packs if they became unbalanced Just trying to find something expandable making use of minimum matched cells and giving some of these 100mah cells a reason to live, just about all the cells I have bought from ebay / gumtree are absolute crapĮven the brand new $800 13s4p battery packs I started off with at the start ~ 2014 did not last long paid premium price $15 a cell and still got shafted I thought he idea is to match capacity in every-bank and not mix ?ġ4~16s 1500mah (14-16 cells) 42~56/48~64vġ4~16s 2500mah (14-16 cells) 42~56/48~64vĪnd just keep adding 14~16s packs as I found matching sets ? You have me lost 1s configuration did you mean 1p ? Tesla batteries pop up for $2k but I feel they are only worth $600 compared what I pay for deep cycle batteries In AU country, always seem to miss out on the good deals here hbpowerwall seems to snap them all up ![]() Really interested in thoughts of if its worth while using more cells in series like 14 / 15 / 16 as these could be limited to max charge 4v and could all be setup for minimum 3v discharge I will not pay more than 50 cents per 1000mah, I normally buy 12v batteries for $50 / 100ah I have been finding it hard getting 18650 cells as just about every laptop that passes through the store lately are not 18650Ĭurrently I have70KwH worth of solar power going to waste (offgrid) and use 120KwH dailyĪnd need to have more storage while18560 cell qtytrickling in I was thinking of just making small packs of either 14~16s 1p cells or 28~32s 2p cells then just parallelthem all on the main bus bar (makes it easier for me to find matching sets) I am just trying to decide how I should make a bank that will be made from scrap 18650 cells with capacities under 1000Mahwithout using balancers (I will still fuse every cell) (can not use any other battery bank here unless I cheat with a DC-DC step up buck converter) 14s 54~56v, bottom 3.4v top 4v (then Ican still use my regular48v 500ah solar battery bank )
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