June 25, 20206 yr i have a 3kva Synapse inverter 4 100ah vision batteries series connected in series parallel. i have a victron battery balancer it is basically a load shedding solution so batteries have not been discharged in 2 months suddenly i have an alarm on my battery balancer the one bank is higher than the other the one battery with positive terminal going to the inverter gets warm , Also the batteries are only 4 months old but bought of the facebook sellers so no warranty does this mean one I gotta replace one ?
June 25, 20206 yr 53 minutes ago, scrarfussi said: does this mean one I gotta replace one No. You now need to get as much life out of what you've got since you have no warranty.. You need to buy new (lead acid) batteries from a reputable seller. Even they take chances! I'm convinced they have a pool of batteries that get swopped with a suspect battery that is returned. (The returned battery is then added to this pool of batteries) Edited June 25, 20206 yr by Richard Mackay
June 25, 20206 yr 1 hour ago, scrarfussi said: i have a 3kva Synapse inverter 4 100ah vision batteries series connected in series parallel. i have a victron battery balancer Okay, so it's 24V setup (judging from the 3kVA Axpert workalike and series/parallel 🙂 ), and the batteries are permanently at float so it can't really be that the cable/terminal is getting hot for some other reason, right? That means you have a dead cell, likely the one that feels hot. Touch the battery on the side (you can usually just make out the plastic compartments of each cell), feel which one is warmer. This is also the perfect example of why individual fusing is a good idea. That cell is most likely getting hot because the two health(y|ier) batteries that sits in parallel is helping the inverter dump current down that lower-potential path. So here is what you do. Since you have two strings, you can take one of them out of the bank and leave the inverter running on 2 x 100Ah series. That gets at least half the capacity back online. Then, what you really should do is purchase two new 200Ah batteries and replace the entire bank with that. Always better to avoid parallel strings if you can. This is option 1. If you cannot do that (cause that is not exactly the cheapest option, that's like a 7k-9k hit), buy two new 100Ah batteries and put them in parallel with the two old ones. You will reduce the life of the two new ones to match the old ones, but because this is a UPS setup and the batteries are kept at float most of the time, it is not the worst compromise in the world. There is a paper out there arguing that this sort of thing is done in telecoms all the time. Last option is to replace just the failing battery, but I fear that's the worst option. Pretty soon one of the others will go, and you'll end up with a musical batteries game 🙂 (Also, this is an interesting data point for the people who say the battery at the negative side fails first... it sounds like this is on the other end 🙂 ).
June 25, 20206 yr Author thanks for the replies its definitely one of the cells when i touch the side i can feel the warmth aaarg and i spent so much on the 4 batteries already flip i wouldn't have thought keeping the batteries in float would cause this i will just ride it out for now as we don't have any load shedding
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