[RE-wrenches] VFXR Slow charge

William Miller william at millersolar.com
Tue Dec 23 11:53:46 PST 2025


Friends:

I was pleasantly surprised to get a call-back from Outback with a familiar
voice this morning.

The inverter has been charging to only 52 VDC at no more than 700 watts
since new. I had blamed the 3kW portable generator. We installed a new
Kohler 12 kW Gen and the problem continued.

I had tried all the suggestions to change re-bulk and re-float and even
reset to factory defaults. Nothing helped.

The OB tech suggested setting the Gen input to Backup and…. problem solved.

I don’t know why but I won’t argue with success.

Curiously I have another almost identical system that charges just fine on
Generator setting.

If anyone can explain this I’d really like to know.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com
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