question

Hello @johnhb

The Multiplus is a bi-directional inverter and it depends on whether you require backup power in the event of a mains failure or not, have access to solar etc. how you set it up. Is this in a house, boat or RV?

I have a pure self consumption ESS and no solar configured only connecting the ACIN to my consumer board. No ACOUT at all. In conjunction with the ET112, the multiplus will run up to it's max and then simply top up with grid (below red at 18:00) as required. This offers no backup power if the grid fails I however use it to buy energy cheaply in the early morning hours (red) and then consume it during the day. As you can see below, blue is battery with only occasional red grid when the electric oven runs and the inverter reaches max capacity. I very much halved the cost of my electricity bill

For the the second option, the best way I can explain my understanding of it is, if you want to configure AC1OUT loads in off grid mode or UPS mode, it should not exceed the 13A output capacity of the inverter for when the grid falls away. Typically used for lights and some sockets depending on the size of inverter and battery capacity. When however connected with shore or mains passthru, you have an additional 32A across AC1 & AC2 OUT and you choose how to set it in line with your requirements. AC2OUT will best be used for e.g. electric oven, water heater etc, when there is shore/mains but a proper design warrants a comprehensive understanding of what you want to achieve etc., batteries, etc. How long is a piece of string? Hope this helps.