PowerAssist functionality - Multiplus ll 2x120

DIY
1

Hello all,

A question for the community about a MP system I am designing, specifically with regards to PowerAssist:

Looking at the documentation, I understand that only the L1 output of AC out 1 has the PowerAssist function.

Very conceptually, let’s say the generator is running and maxed out at 50A, and the system is perfectly balanced so each output (AC-out-1 L1 & L2, and AC-out-2 L1 & L2) are each drawing 12.5 amps.

Now all of a sudden, something else kicks on on L1, looking for another 10A. The PowerAssist will feed that additional 10A into AC-out-L1.

Assuming all of the above is true, what if the additional 10A is called for on AC-out-1 L2, or one of the AC-out-2 lines?

Will the system still PowerAssist 10A into AC-out-L1 so that the generator output can shift to satisfy the add’l 10A elsewhere?

With the introduction of the Victron equipment, I am looking to downsize my (old, broken) generator from 8kW to 6kW, and believe that should not pose any issues since I can pick up 3kVA with the PowerAssist. Would anyone counsel against the downsizing?

Thanks, Steve

2

When ac input is connected, ac output 1 and 2 are connected together so L1 on output 1 and 2 are not distinguishable and therefore power assist applies to both ac outputs on L1. Doesn’t matter which output needs the assist.

3

Thank you Derrick, I think I see what you’re saying, and I’m taking a closer look at the power flow diagrams at the back of the manual.

In Single phase mode, the AC-out-1 L1 connects across to all output legs, so the power assist would flow to any connected load.

In Split phase mode, the AC-out-1 L1 connects to just the L1 on AC-out-2. So both of those legs would receive power assist…. and L2 of both AC-out-1 and AC-out-2 would not receive any power assist. Presumably this a non-issue if connected to good shore power.

Power Flow Shore Power.pdf (153.5 KB)

Power Flow Generator.pdf (206.0 KB)

Is this a correct interpretation of what you wrote? Thanks in advance, Steve

4

Yes that is correct