Hello everyone (and Stuart specifically) … I have installed a 16s LFP system with v.4.21 modules and use the relays on the (ESP8266) controller to manage the contactor which cuts off the battery in case of issues.
I have noticed that (usually at night, like 1AM or 5AM) when the loads are really low, sometimes the controller reboots every minute for 10 to 20 minutes, which cuts off the relay … the battery, and in the end the inverter (Victron Multiplus) either goes to “Passtru” or even shuts down because it thinks the battery is low.
I have moved the controller away from the cells (originally it was on top of the cells - separated by a PMMA sheet of plastic (see picture) as I wanted to keep TX/RX as short as possible.
I changed the generic ESP to a LOLIN D1, changed the controller (had another one), soldered the relay board to the controller outputs, changed the DC source to a more powerful one … and moved the controller away, so now the TX/RX cables are longer… but to no avail.
This night again, the controller decide to reboot during 10 minutes …
I will try to add more ferrites to the cables to see if it is due to interference, but I really doubt it, because I noticed that interference is usually at high charge/load rates, when the controller loses communication. In this case the loads at night are reallly low.
Can somebody tell me what else I should check and/or improve ?