I’ve installed a Multiplus 2 connected to 6 PylonTech batteries and Venus GX with the primary function of running my heat pump from off-peak electricity. I can’t get any advice on how to power the house system when the battery is fully charged. Do I have to have dedicated circuits in AC-OUT1 or 2?
@Richard Weir You can have the house on AC in but you will need a CT sensor or a ET112 meter, and the power assist turned on in VE config, or you can have your house on AC out 1 limited to 50amps inc charging. In you use AC out1, the multiplus will use the CT sensor built in on the AC in. Dont connect the house to AC out 2 as in the event of a grid failure / power cut, AC out 2 automatically disconnects as its for non-critical loads.
Have a look at my photos on the below link, I have a schematic of my system. Note in the photos I hve a CT sensor on the incoming tails.
https://vrm.victronenergy.com/installation/171934/share/db6807bb
@Richard Weir I forgot to mention, I have a Mitsubishi Ecodan WM85 on the AC out1 of my Multiplus 5kva as well as all electric cooking (induction hob & electric oven). My ASHP don't pull more than 16 amps even when doing the last part of a hot water cycle. I charge on off-peak or solar and I have never gone over 50amps. I have a 32amp EV charger on the AC in side of the Multiplus because that would push the current over 50amps.
This very much depends on the capacity of the system and your expected power need. For example, if you had a Multiplus II 48/5000 and you rarely consume more than 4kW at any one time, and never more than 12Kw, you could wire AC-OUT 1 to the consumer unit. Presume, though, that you heat pump will be a big factor here. If you provide more detail then people on here can help - i.e. inverter, batteries, heat pump power need, daily consumption, that kind of thing.
Thanks for those details, very helpful. I have a 48/5000/70 amp Multiplus 2 which calculates as about 16kw. So I could put the whole house on the inverter and will consider that. Like you say the main draw is the HP so I think I'll connect that to AC OUT 1 as a first mod.
my next problem is that the battery is now not discharging. its stuck on passthru and i cant seem to mod any of the VE Config parameters to get it back to feeding into the system - help would be appreciated. thanks so far
https://vrm.victronenergy.com/installation/221360/share/098d9b04
@Richard Weir Check you have the rocker switch underneath the unit on the right hand side set to inverter chager, not charging only.
Here is my inverter
And the dashboard
Which ESS mode are you using, and what is your minimum SOC set to? Also, what Grid Metering do you have?
I’m using Optimised with BatteryLife. SOC set to 10%. I’m just using my Octopus smart meter.
Just to note there is no requirement to use a grid meter, as per image below. Have to say, am intrigued by the size of the earth cable in your pic above?
If you want loads on the AC IN side of the Multi to consume battery power then you DO need a meter to speak with the system. In a single phase, you can use a ET112. Without that, it considers any power taken from the AC IN side as power fed to the grid so stops that power from exiting the Multi.
Here is my system.
