Battery problems and LiFePO4

Author	Message
Revlac Guru Joined: 31/12/2016 Location: Australia Posts: 1297	Posted: 01:30pm 13 Jan 2024       Thank's Mike, I haven't set the pack voltage on the BMS, its default setting is 60v,(not used) will probably change that later and see how it behaves, as its running now its been fine for the 2 systems on the house. They have been set to bulk charge to 56v and float at 54.4v, however the float voltage can introduce some micro cycling between large loads been switched on and off, not really concerned about micro-cycling there has been arguments before and EV's with regen switched on do that anyway.   The charge controller's (3 of them) are pcm60X, bought the first one back in late 2015 and the other 2 later, a few months ago one of them decided to run an Experiment for me,    it started reading the battery voltage, 1 volt higher than it really is (It happened before a long time ago and I thought I had repaired it), so bulk charge and float are 1 volt lower on the battery, bulk charge to 55v and float at 53.3v also I'm not using the voltage sense wire on this one as it chose to ignore that last time. Anyway as this experiment progressed looking at it on occasions there is very little to bugger all micro-cycling going on, so will leave it this way and see how it compares to the other one after years, its also further from the main battery than the other CC and has a longer battery cable as a result. I don't ground ⏚ the main battery on either of these setups. Battery SOC here is mostly consistent at 70% in the morning the notable change is when we do some shopping and put a few weeks worth of food in the big fridge and freezer and they each work harder all night. Actually that is the SOC reported by the DALY BMS so the measurement will be out a bit.   I just stripped the wires back on the Daly Active balance leads so they will fit into the terminal blocks that the BMS wires are connected into, the wires between the terminal black and battery terminals are much heavier, pretty sure the the 17pin connectors are different on these. Edited 2024-01-13 23:31 by Revlac