Hi all. I am trying to set some custom parameters for my multiplus using “Assistants”
I could do with a little guidance if someone would be so kind.
My system is in a motorhome and utilises a 3000/12/120A Multiplus (not Multiplus II). It’s an American motorhome thus 120v inverter but Watts are the issue.
I do not use anywhere near the 3000VA that the inverter is capable of and I want to “de-rate it” i.e. I want to lower the limit that the system will supply so as to protect my system and wiring.
I know that the immediate response I’m going to get is “use bigger cabling” but it’s not the cabling that worries me, it is the fuses.
I am using “marine” ceramic MRBF fuses at the Battery Terminals. These feed all DC loads and the Inverter supply.
and ANL fuses before the Inverter.
The ANL fuses that supply my inverter generate heat.
I have a thermal imaging camera and the ANL fuses get to about 75C when I pull 150A DC. Not the wiring, but the fuses and it bothers me. The MRBF fuses gut warm but not hot. The shape of the MBRF fuses don’t lend them self to replacing the ANL fuses which is one solution I suppose.
Because the inverter wiring is stated as being doubled up, I decided to double up the fuses so that rather than 1 300A fuse I have two 150A fuses in parallel. One in each + leg of the supply to the inverter (which are identical in length).
This most definitely helped but I’m still wary and uncomfortable using the system to its full capacity.
Because the Multiplus is capable of generating (inverting) 3000VA (2800W) I want to prevent it from doing so, but can’t see anything in VE Configure settings that allows me to specify an upper limit, i.e. 1500W. Can it be set?
Secondly, as per my topic opening question, I’d like to use an “Assistant” to protect the system.
I want to set the Multiplus to monitor the temperature input (which I’ll locate at the ANL fuses) to switch off the Inverter if an upper temperature is reached.
I’ve looked at the “Assistants” but it has me scratching my head.
The obvious choice is “Safety Switch”
Then tell it to monitor the “Temperature Sense Input”
Now the bit that has me scratching my head. It asks if the temp sense input is Open or Closed. That would make sense for an Aux input but not Temp Sense, surely?
What am I missing?