Re: Heading Over To The Dark Side
Posted: Mon Mar 18, 2019 2:32 pm
Yes being following this thread and others On fb and other sites
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I was thinking about this......Hi NP, if you use longer cables to the aux pack than those from the main pack that powers everything then they will just remain topped up. If the cables are shorter however, the 120 Ah pack will become the supply pack and the 480Ah battery will just be an aux tag on that offers very little to supply load until the 120Ah pack is completely drained. You can try to get the resistance between the load and the battery packs identical and that will help, but the battery pack with the least internal resistance will still be the main supply until virtually exhausted causing the resistance to increase, then the other pack will take over. Eventually the pack with the lowest resistance will have been tortured to the degree that the internal resistance increases till it is the same as the other pack, then they will sort of work together.
A meter won't tell you anything except cell voltage and we know lithium batteries hold a fairly constant voltage anywhere between 95% SOC and 20% SOC. They will even hold a very close voltage all the way down to 0% SOC if the load is small. The difference between 0%SOC and completely drained is the tricky bit because the voltage drops suddenly when there is absolutely nothing left in the cell.nut17 wrote: ↑Sun May 26, 2019 6:19 pm I must run across the cells with a meter to check that this installation in my mates "Explorer" motorhome on a 2017 Ford Ranger to make sure the pair of paralleled 12 volt 100 AH LiFePO4's are still remaining equal. This battery installation was completed by AA Solar in Silverdale, near Auckland in 2017. The shape and size of the space for the batteries would not accommodate a single 200 AH unit.
Cheers
Chris
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