Posted December 28, 20222 yr Hi there I recently bought a Axpert King 5kW (Synapse 5.0KRM+) and Pylontech US3000C. Set everything up as per the inverter manual for Pylontech batteries and using the supplied BMS cable - all is working fine, but of course it is via RS485. Given that the inverter have CAN-bus, I was wondering if there is a way to have the comms run over that instead. I guess what I'm really after is for the inverter to instead use the battery's reported SOC % for things like cut-off etc instead of the inverter doing this based on the battery voltage that it reads. This seems to be possible when using WECO batteries according to the manual - just curious if this is possible with a Pylontech? Tried to find answers elsewhere but haven't had much luck - so figured I'd post here.
December 28, 20222 yr 26 minutes ago, hjlinde said: , but of course it is via RS485. According to my knowledge, pylontech RS485 provides actually more information then the pylontech canbus. So you should have battery SOC already available. Is there a reason why you doubt the SOC when connected via BMS.? Secondly your axpert only supports pylontech over RS485, and not canbus.
December 28, 20222 yr Author Not that I doubt the SOC. Just figured it would be nicer if the inverter would rather adhere to the SOC as reported by the battery like it does when you pick WECO for Program 05. When you do that the inverter uses SOC % rather than rely on voltage readings. My limited understanding is you'd much rather want the inverter to e.g shut off if battery SOC is at for example 10% as per the battery's own BMS - as opposed to draining the battery till the inverter *thinks* its time to shut off because voltage dropped too low. ***Should add I thought the above was due to WECO + Axpert using can-bus Edited December 28, 20222 yr by hjlinde
December 29, 20222 yr 17 hours ago, hjlinde said: I thought the above was due to WECO + Axpert using can-bus No, they could do it with RS-485 as well. Axpert BMS will only talk to the Pylontech BMS via RS-485. It is possible that later display firmwares will use SoC% thresholds with Pylontech, as some do with Weco, I have not looked into this. Updating display firmware is tricky these days; do your research if you decide to try updating it. Edit: The other possibility is to get third part monitoring software like Solar Assistant to talk to the BMS, and change modes for you based on SoC read from the BMS. Edited December 29, 20222 yr by Coulomb
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