Power Assist, the two AC Inputs and Outputs

DIY
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1

Hi,

The question is regarding Quattro-II 2x 120V.

First Question:

After reading the menu, I am a bit confused about which should be connected to AC input1 and which should be connect to AC input 2, considering how power assist works.

The manual suggests that AC input 1 is connected to generator, and AC input 2 is connected to shore power, which makes sense to certain degree, because if both inputs are connected, input 1 will take priority, when you turn on generator, that means you are preferring it over shore power even if shore power is connected.

In section 7 “Technical specifications” (page 22), it says PowerAssist is for L1 input. I assume that it means that it can assist both AC input 1 and input 2 but only on L1?

Question 2:

In the same manual page 14, regarding “AC-out-2”, it says:

A second output is available that disconnects its load in the event of battery operation. On these terminals, equipment is connected that may only operate if AC voltage is available on AC-in-1, e.g. an electric boiler or an air conditioner. The load on AC-out-2 is disconnected immediately when the inverter/charger switches to battery operation. After AC power becomes available on AC-in-1, the load on AC-out-2 will be reconnected with a delay of approximately 2 minutes. This to allow a genset to stabilize.

It means AC-out-2 is only available when AC-Input-1 has power, i.e. when generator is running if following the recommended way of connecting input 1 to generator.

So I am puzzled that AC-out-2 is not available on shore-power in that case?

Thanks!

2

Yes, because the 2x120 models can switch through the two phases from a source, but internally theres only one inverter, on L1. This also means that when on battery you have no splitphase anymore, both L1 and L2 receive the output of the one inverter, allowing for operation of 120V devices when on battery, but 240V ones only on generator or mains input. You can see the power flow schematics at the end of the manual

For this im not certain, but it sounds like a copy paste error in the manual. On a regular quattro, ACout2 is available when either of the two ACin are switched through. In any case, you can also change the behaviour of ACout2.

Since you mention a page i guess you are using a PDF manual? Personally i always use the html manuals directly from victron, they are the most up to date. It says

Besides the usual uninterruptable output (AC-out-1), an auxiliary output (AC-out-2) is available that disconnects its load in the event of battery operation.