Looking for some ideas, I’m trying to have AC2 switch off with SOC that is calculated by the Lynx BMS with Lithium NG Batteries.
I do have a cerbo in between them however the issue I’m facing is the Multiplus2 wants either its own calculated soc or a ve bus soc for the assistants programmable relay functionality and because the lynx is ve can not ve bus won’t broadcast to the multiplus and because dc load is a significant componment to the load I can’t rely off of the inverters internal soc measure.
Any Ideas?
I’ve been thinking of protocol bridging the lynx onto vebus, and I have tried just using direct voltage as measured at the inverter but both are either too complex or too unreliable a solution. I also can’t use the dischareg protect signal as I’m having the lynx trigger a whole system shutdown at 15% soc and I want the AC2 to switch off at 30%
Usually the ve bus synchronises with the bms soc when the bms is the system monitor.
What you can do is look at a node red flow that uses the lynx soc with some wiring from the cerbo relay to a temp sense or something. Then the inverter use an assist to switch ac out 2 based on the t sense state.
Hi LX. Are you saying you can use assistants within the Multi-II that rely on SoC coming from another device other than the battery monitor built in to the Multi? I’m not clear if that’s what you meant to say or not. It is my understanding that the only SoC the assistants will read is from the built-in battery monitor, not an external one coming from a CAN-bus battery, SmartShunt, BMV, or Lynx BMS. But, I’m not 100% certain of that.
Hmmm. I’ve not been able to make that work using SoC from an external device with assistants on the Multi/Quattro. I will have to retry that. Wait, now that I think about it, I wasn’t using assistants, I was using Ignore AC functionality within Virtual Switch settings. I wanted to disable Ignore AC (allow AC power) when the battery SoC reached a certain threshold…say 20%. I had to enable the battery monitor inside the Multi to get it working. That’s ok when only using Multis and MPPTs, but with other DC loads and sources the built in battery monitor isn’t accurate.
I’ll try to find some time to test both VS and assistants using an external battery monitor so I can convince myself it’s supposed to work
I have never used it with VS. but have used assistants to ignore AC in.
Have found for ac ignore using the GX gen start stop way from the GX the easiest.
