I have a some victron gear running an off grid home. 15kVa Quattro, Cerbo, MPPT RS, Fronius Primo, BYD LVL
I’d like the system to shut off a load in the house depending on the state of charge of the system, when battery is low (say 40%), and switch it back on when the SOC is above a certain level. (say 80%)
I guess I’ll use a programmable relay, either in the quattro or cerbo, to energize a contactor for this - which is better - and how would I program the above settings?
If you don’t use AC Out 2 for other purposes, you can connect loads you want switched to this (no relay needed) and use an assistant to turn them on and off – I do this with an immersion heater to use excess solar power to heat the water.
Ootikns for driving a specific contactor for a specific load includes the aux or k1 relays. )Not sure what quattro you have exactly your choice will depend on what is available to you)
You will need to program two assistants using the programmable relay assistant. You can open ve config in a fake target to play with the idea.
Thank you @iand and @lxonline !
Yes, the programmable relay assistant, with multiple instances would be what I (also) need, drive surplus immersion heater (on AC Out 2). Instance for condition on, off, I’d use another ‘and’ condition for when Load is <500W (I am on MPII 3kVA, heater is 2kW, ESS but most of the time Inverter only - not ON grid).
Say that I want more flexibility for ‘and’ conditions, e.g. (extreme) “Set relay on when it is sunrise +2h AND sunset -2h” (not to deplete the battery), or even take into account next hours weather conditions (“it’s gonna be cloudy, do not set relay on for rest of day”).
OK, I understand these are more complex, would need Large image and NodeRed. I’d appreciate some guidelines how to start this (completely novice on NR).
A sure need is to be able to override the above, with some manual control (button? VRM?), e.g. “I need to shower, turn relay on whatever the assistant says”. Can at least this be implemented simple, for AC Out 2 relay (with an external relay can do an ‘OR’ with a switch)?
TIA
Ah node red.
Well then none of the above apply. Those are for the base programming on the inverter.
You would wire the GX relay to the contactor to use node red.
There are a few flows knocking around on the forum for the soc switching. The time after sunrise and the manual override control require a bit more thinking to work out.
