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Hi,
Is the critical Loads AC Out (AC Out 2) terminal bi-directional?
If I want to keep my complete house AC distribution board powered during a power cut but also fully utilising the solar and battery power stored when grid is available do I just wire one circuit from my house DB to the Mulit I AC Out AC 2?
If so are there any restrictions to the Multiplus that I can expect from wiring the complete house DB through AC Out 2?
Some things for consideration are:
1) You would need to make sure that the full load of you house is not above what the transfer ability of the Victron is. The transfer ability is usually the full load of the inverting capability plus charging amps, don't forget that charging current is also a load.
2) What surges there would be through the system for high start current items like pumps.
3) Would there be an overload if the power goes out and the full load of the house is on?
Thank you @Alexandra,
I hear you. I think the answer is to run two circuits? One to AC IN (protected by a 45A MCB) to handle normal operation and one to AC 2 (protected by a 20A MCB). The cable returning from AC 2 I can then wire through a changeover switch if I want to use the 20A AC 2 output and then isolate high demand circuits prior to turning the changeover switch over.
Powercuts will be an extremely rare occurrence but if I am going to run cables from the ground floor to the loft I may as well try and get the full use from the Mulitplus ii.
@NeilBridgeman Am I understanding the idea of bi directional correctly? You want to feed back into the multi through the AC2 output? Or are you concerned it can happen? Yes it can happen with poor wiring (have seen it) but is not designed for that not good for the health of the inverter.
The answer to the question on wiring, usually if the Multi is able to handle the whole household, we take the feed from the mains switch to the AC in of the multi and split the DB over the two different AC out feeds based on what the customer determines as critical and non critical loads.
But if the Multi is too small in capacity to handle the entire household then we leave grid feed to the circuits that we know the multi cannot handle, splitting the DB board into three. That way mistakes cannot be made.
We have used a changeover switch on an inverter output so that when the householder wants to run higher loads, the loads can be powered from Grid directly, but it was not a Victron, hence the creative wiring. If there was no power they could choose their loads then switch it over to inverter, requires good household occupant communication though to prevent overloads.
