Quattro power consumption single vs 3-phase no-load conditions

DIY
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Hi, this question is around what power consumption I should expect from Quattros configured in both single and 3-phase under no-load conditions, i.e. just running from battery storage.

I have 3 x Quattro 48/10000 with no AC input or output connected, other components include Lynx Shunt, Lynx Distributors and Ekrano GX. Storage battery is full (between 53 - 55V).

The Quattro firmware version is the latest currently available (552).

I’m running some commissioning tests to understand off-grid power consumption when no solar, no generator and no load is applied. Only power is from a storage battery.

The tech data sheet says the zero-load power consumption should be 55W (or 35W in AES Modified Sine Wave mode) per Quattro.

My Lynx Shunt reports around ~25W average consumption when all Quattros are switched off. So this is my baseline consumption from all connected lynx components. Sounds sensible and no problem there.

When I switch on a single Quattro configured in stand-alone mode, the Lynx Shunt reports an increase to ~90W being drawn from the battery, i.e. consumption from the Quattro alone is around ~65W. Whether Quattro is in charger-only, inverter-only or fully on makes no difference. Whether Quattro inverter is in AES Modified Sine Wave mode or AES is turned off makes no difference either, which is a bit surprising. I would have expected AES mode to reduce the zero-load power consumption.

When I reconfigure the 3 x Quattros to run in multi-phase mode and apply the same test, the Lynx Shunt reports an increase to ~320W being drawn from the battery, i.e. consumption of the 3 Quattros combined is around 300W or 100W per Quattro. Again Quattro inverter/charger mode and AES mode make no difference.

Two questions arise:

  1. Is there any reason why the zero-load power consumption of a single Quattro is higher than stated it should be in single mode, or why the AES mode is not reducing the power consumption again as stated?

  2. Is there any reason why 3 x Quattros working together in multiphase configuration and under zero-load power conditions should consume more power than 3 x Quattros running in single phase configuration?

Would be good to understand what I’m seeing so any thoughtful insights would be appreciated!