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Found it! Turns out it was a breaker in the grid feed that was partially de-activated by a generator breaker interlock mechanism in a small QO panel. Even tho the inverters had voltage on both L1 and L2, the L2 phase was slightly flaky. Didn't show up on a voltmeter or even on an oscilloscope...

My quad split phase Sunny Island setup stopped using L2 from grid to charge the batteries. The setup still supplies 240VAC, but the batteries will only charge from one phase (L1). There are no fault codes that I can find. Any ideas? TIA.

Since this forum seems to truly be "Do It Yourself", I discovered the answer to my own question myself. Posted here to help others. To delay charging the batteries, the SI GdSOCEn needs to be enabled and the GdTm* parameters need to be set appropriately. So for example, if your want to supply...

Surely someone on this forum must have some in-sight on Sunny Island setups. Or did I ask the question incorrectly?

Is there a way to have the SI delay charging the battery until a certain time of day, yet still supply loads on the A1 protected buss from the grid on A2? In other words, I want to have the SI supply the load current to the protected A1 loads from the A2 Grid, but not charge the batteries until...

I guess what I'm really asking is - How does 232-41, GdSocEn (Activate the grid request based on SOC), really work? How should 233-01 through 233-09 be set to accomplish the charge delay in my original question? Or is that not the purpose of GdSocEn function?

Is there a way to have the SI delay charging the battery until a certain time of day, yet still supply loads on the A1 protected buss from the grid on A2? In other words, I want to have the SI supply the load current to the protected A1 loads from the A2 Grid, but not charge the batteries until...