do the victron mppt charge controllers have a dump load option?
I'm using the Multiplus on a 48V system to divert the excess power to a 1,2 KW boiler.
Multiplus has a relay that controls a contactor which turns the boiler on/off.
Multiplus turns on the contactor/boiler when VDC > 54V.
It turns off the contactor/boiler when VDC < 52V or AC load > 2000 W.
I noticed that if the PV output drops for whatever reason (a passing cloud) the boiler doesn't draw current from the battery for more than 10 seconds before it gets disconnected so it doesn't have a significant impact on the battery.
For the 'boat' community we definitely want to utilise as much solar as possible and heating water is a regular requirement. As a sailboat we do not always have our engine (water heating) on so solar or generator are the only other options (aside from taking a swim). We are today installing 2(3) x 200Ah LiFePo4, 24/5000 VA Multi, VenusGX, MPPT, 2 x BP220 + VE.Net BMS protection etc. We have a 4.5kW generator & 1kW solar (nom) + 16A (230V) shore power obviously (infrequently). We are (intending) connecting the AC water heater circuit (relay activated by VenusGX) and AC supplied by Multi as a dump load based on SOC + MPPT in charge (i.e. we have sun). Located generally in the South Pacific (east coast AUS currently) solar is most often available. Not sure how this will turn out over time and any suggestions / warnings welcome.
This is what I have installed in front of my ESS system, between distributor grid energy meter and ESS Victron meter. Hence, any energy exported by ESS will heat the water in my hot water tank. Starting from March till October I didn't pay any money for producing hot water for my family
what about using a second charge controller (running an inverter without a battery, connected to a water heater) turned on and off (via a relay) from the aux of the main charge controller (midnite classic) that way you could use ac for longer cable runs without cycling the batteries?
MPPT 75/10 Efficiency Curve 1 Answer