Batteries with the same chemistry, but from different manufacturers or of different ages, can have very different internal resistances. This means if they're connected in parallel you will get very different currents, resulting in one battery being overcharged and the other undercharged. In other words this only looks like it works, but you're going to seriously shorten their lifetime.
To ensure equal draw from all batteries in paralell you should connect the load to the positive of the first battery and to the negative of the last battery in the chain thus ensuring that current flows equally through all of the batteries. the same applies to charging. Hope this helps. Final point, don't mix batteries of different ages
you mentioned the other battery you added was at 92%, did you use a separate battery monitor or shunt to find out it was at 92% before it was added to the bank ? thinking about doing this too, but how do i find out what the extra battery is at beforehand.
DO you not have to space the batteries farther apart to avoid them getting too warm ie overheating ie a fire hazard? they look like theyre like 1 inch apart max! we keep hearing about the car lithium batteries heating up and setting garages/buildings on fire etc. Hope you have good smoke detectors as they can burn really hot really fast, hmmm, i wd b sleeping with one eye/one ear open, so to speak.
I have temperatue sensors taped to the batteries. They tend not to heat up. LIFEPo4 Batteries dont have thermal runaway like regular lithium batteries. it should be fine. I do have three smoke detectors in my rig.
I've been warned about mixing LiFePo4 batteries of different brands! Differences in internal resistance, etc. There may be some truth to what people have said, but I think it may be unimportant after all. A tempest in a teapot.
Batteries with the same chemistry, but from different manufacturers or of different ages, can have very different internal resistances. This means if they're connected in parallel you will get very different currents, resulting in one battery being overcharged and the other undercharged.
In other words this only looks like it works, but you're going to seriously shorten their lifetime.
To ensure equal draw from all batteries in paralell you should connect the load to the positive of the first battery and to the negative of the last battery in the chain thus ensuring that current flows equally through all of the batteries. the same applies to charging. Hope this helps. Final point, don't mix batteries of different ages
That's awesome!!
Battery technology one of the great inventions at least i don't have to boil lithium batteries
you mentioned the other battery you added was at 92%, did you use a separate battery monitor or shunt to find out it was at 92% before it was added to the bank ? thinking about doing this too, but how do i find out what the extra battery is at beforehand.
The battery itself has a monitor built in and bluetooth. I verified the battery voltage with a DVM also.
@RvTipsandTrips not mine thus my question. Thx. Dvm , multi meter ?
@scottm4977 yes digital volt meter. I took a short cut. Just fully charge all batteries before connecting together and it will be good.
@RvTipsandTrips dont have 2 separate chargers, which is my problem. Can't put the extra battery into bank not fully charged.
Cant u mix LiFePo4 whit LiMn204
You should NOT mix different chemistry bstterries.
DO you not have to space the batteries farther apart to avoid them getting too warm ie overheating ie a fire hazard? they look like theyre like 1 inch apart max! we keep hearing about the car lithium batteries heating up and setting garages/buildings on fire etc. Hope you have good smoke detectors as they can burn really hot really fast, hmmm, i wd b sleeping with one eye/one ear open, so to speak.
I have temperatue sensors taped to the batteries. They tend not to heat up. LIFEPo4 Batteries dont have thermal runaway like regular lithium batteries. it should be fine. I do have three smoke detectors in my rig.
good idea@@RvTipsandTrips
I've been warned about mixing LiFePo4 batteries of different brands! Differences in internal resistance, etc. There may be some truth to what people have said, but I think it may be unimportant after all. A tempest in a teapot.
So far so good.The BMS keeps it all kosher.