![]() Turn off the coach battery switch so nothing is drawing power during the install.Ĥ. Make sure your new batteries are charged to approximately the same level.Ģ. Here's a few tips or observations from my upgrade.ġ. Finally, the batteries stayed at 13.4V and everything works. I hooked the batteries back up to a wall charger to charge everything back up to 13.4V and wired the batteries back up. Of course, about 8 of the 12 hours was spent removing the batteries and trying to locate a short or other reason for the battery shut-off. ![]() My problem appears to have been that one of the batteries was about 1V lower than the others, so when I had all the lithiums connected, my multimeter showed the batteries at 0.6V - so it looked like the BMS kicked-in and shut everything down. Took about 12 hours by myself over a few days crawling around under the Revel in my driveway. Tools: WD40, 11mm deep socket, 10mm wrench, stubby Philips screwdriver, multimeter Just finished swapping out my dead AGMs with new Ampere Time self-heated lithium batteries. ![]() LiFePo4 battery chemistries aren't meaningfully different in many/most chargers and solar charge controllers - neither use an equalization phase, and both will require a similar peak/absorption charging voltage of ~14.4V - in general most any charger configured for AGM should also charge LiFePo4 batteries safely (thus the "drop-in replacement" marketing. If you're going to be in the cold, using non-Lithium batteries of some kind or mounting the batteries inside the coach (a la RoamRig) seem like the only really safe solutions (to me), unless you have some bullet-proof way to bring the batteries up to operating temp and keep them there without relying on the batteries themselves, such as a fluid loop from chassis coolant, or electric heat from the chassis (+ probably a high idle setup).Īs an aside, charge profiles for AGM vs. ![]() no battery power also means no heat and no water pump. I wouldn't consider electric heating blankets or similar sufficiently reliable for an external installation if they're driven from the same batteries you need to keep warm. I wouldn't personally mount any LiFePo4 batteries externally unless I wasn't ever going to use the van in temps below their charge/discharge thresholds. There's also a discussion about moving to Silicon Dioxide (SiO2) batteries which are suitable to -40C, 2800 charge cycles (at 50% depth of discharge), made in Canada ($500) - better than Lead-Acid / standard AGM batteries (500-1000 cycles)
0 Comments
Leave a Reply. |