Hi, another complete noob here needing some advice on installation of below equipment to a 3-phase DB. I had hoped that this would be a simple installation by moving circuits that I have marked as essential (lights and electronics) on to one phase and linking that phase to the inverter. But 3 electricians later I have been told 3 different ways...

Thanks in advance!

1 x AXPERT Hybrid 5000VA Inverter Charger

2 x PYLON-US3000

1 x Cable Pack for US2000B / Phantom-S Batteries

1 xPylon US3000B x 4 Cabinet With Support Rails 

1 x Mount AX Series 5M includes Switches / Solar Fuses / DC Breakers / 5M 35mm Battery Cable 

18 hours ago, Muon said:

I had hoped that this would be a simple installation by moving circuits that I have marked as essential (lights and electronics) on to one phase and linking that phase to the inverter.

Welcome @Muon. 

It will not be easy to answer your question without seeing the setup and looking at all the loads, but theoretically your plan can work. 

The most important thing is to try and keep the phases balanced when you start moving loads around. If moving the "Critical" loads results in creating a major imbalance of the phases, I would personally not do it. Unless you are on a maximum demand billing tariff, an imbalance wont make a big difference, but it remains beneficial to the network if the three phases in your property remains as well balanced as possible. 

If your electrician spends a little bit of time, he should be able to work this out, and if he does, nothing stops you from doing it the way you wanted.......... except for one small detail, The Axperts has not been approved for installation in SA yet.. so you might run into trouble with your local Municipality  in the future.  

Then one question from my side, I dont see any panels in your list, Are you planning a "UPS" type installation? Charging the battery's from Grid and keeping them charged for backup in case of a grid failure?