I have a 48v stand alone energy system comprising 2200 AH gel batteries charged by 2 PV arrays of 5kw each.
The Victron management system comprises a 10kw Quattro, 2 x 250/100 MPPT controllers, BMV712 and Venus.
On average the batteries go 100% SOC each morning at about 10:00 and by 12:00 (midday) they are on float with PV largely not utilised.
I wish to utilise the excess energy into water heating whenever the MPPT controllers have the batteries on float.
It seems to me that the system SOC is not a good, effective nor efficient way of tripping this point.
Water heating by 230v AC is a far better method of energy collection than solar hot water collectors however the Victron management system appears to not cate for this most basic requirement!
Years ago when I operated a 10kw wind turbine, I built a voltage regulator in the DC turbine output that would divert raw DC output (prior to the battery charging regulator) from the alternator into a water heater. I had it set up so I could adjust it from 58 - 62 v. It worked brilliantly and helped to keep an even load on the turbine thus saving it feathering the blades in strong winds.
Surely the Victron MPPT controllers should have something similar with suitable hysteresis parameters triggered by the float condition?