Hi Kevin,hello all
just wanted to tell everyone about our situation. and/how hi power and the electric car co made everything right.
my name is kevin from topeka electric motor, we have showed you our 2000 s10 truck. topekaelectricmotor.com this is were it can be viewed.
we have 48 cells 200 amphr. with reap bms.
shortly after we had the truck running our bms found that we had some weak cells, these cells wouldnt hold the same substainable charge, we made 3 long test runs to try to get over the 100 mile mark, the batteries all performed exactly,the same to about 75miles. and then you could watch the voltage levels lowering considerably faster on these cells than the other cells. we had 10 cells showing these signs. you could put the truck on the charger and these 10 cells would come back to the correct voltage and all 48 cells would end up .030 volts from highest to lowest. like i said we did this test 3 times, loging voltages per cells and total volts per mile. aslong as you only drove less than 70 miles and then recharged, the cells performed exactly the same,you wouldnt of know there was a problem, until you went over that range and you then had these lower cell issues. without a good bms it would be hard to find and prove these issues.
hi power batteries say they have a 2 year warranty, well after all the documention and proof, we had 48 new cells show up at our shop today. we will be installing them this weekend.
big thanks to carl clark (electric car co ) and hi power batteries. stand up companies are hard to find these days.
48 cells of 200 Ah is 30720whr. To cover 100 miles you would have to run with an efficiency of 307 wh/mile. That's a lofty goal for an S10 truck. Did you check any of the 10 weaker cells to see how many Ah they were capable of discharging? Most people with this kind of vehicle would be happy with 400 wh/mile...which would give you about 76 miles. Perhaps the weak cells aren't too far off the actual 200 Ah rating???