I just wanted to activate my multiplus II for the first time. I connected the AC IN to an outlet and grounded from the ground pin of the AC IN to the case.
A few seconds after the multiplus II is switched on it triggers the earth leak switch.
I couldn't do any configurations on the multiplus since this was my first attempt to switch it on. In the next step I wanted to start configuration.
Do you have a battery connected? If Not: that is your problem.
Jens
I have no battery connected. Isn't it strange that if there is no battery or if the BMS would disconnect the multiplus would trigger an earth leakage ?
The multiplus should not be install on an Earth leakage in fixed installs.
But yes, it some systems if there is no battery attached it will trip Earth Leakage during relay test. Typically in a VAN/Boat/RV the battery is always connected to the inverter. So not a problem.
I'm completely lost now. The multiplus should be possible to connect to mains and even can send power back to the grid so in that situation it has to be connected to an earth leakage protection. I understand that in most situations the battery is connected but there are situations where the battery will not be connected. (maintenance, bms disconnect because off cell unbalance, bms failure, ....) I can't understand this would trigger an earth leakage because in that situation the complete installations becomes offline while the advantage of the multiplus is now exactly that it is multi purpose.
In a fixed install you will have your main feed coming from the grid.
Main Isolator/Breaker -> Multiplus Breaker -> Multiplus -> RCD/Earth Leakage -> Plugs/Light Breakers. I am not aware of any country that will require RCD before inverter.
Relay Tests only really happen when Multiplus is turned on or if grid is lost. This is when the grounding relay kicks in. The multiplus is not designed to run without a battery, if the BMS disconnects the unit will most likely trip off due to DC ripple.
For maintenance and other failures we normally install a transfer switch which moves loads from Multi output to grid.
Normally after the grid main isolater we require an earth leakage from 300mA and even 30mA for rooms like bathroom or outdoor. After that we have the brakers for the individual circuits. I plugged the multiplus in a wall socket from my garage that is behind the 30mA earth leakage. This is temporarily just to get the multiplus programmed and tested with the battery. The final install will be a seperate breaker for the multiplus but this braker will alwasy be behind a 300mA or even a 30mA earth leak from my main electricity panel.
What country are you in?
It is very strange to require RCD protection on a fixed device that has an earthed metal case. Most regulations have an exemption for equipment like the Multiplus.
I totally understand having 30ma RCD protection on outlets and other appliances and I am particularly fond of RCBO where each circuit can have it's own RCD protection.
Thank you all for the feedback. Will build the battery first and test again. Waiting for the last connectors to start the build.
