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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