Hi,
The most I've seen was 14.6 from the alternator. 13.9 take a heck of a long time to charge depleted house batteries--which is what is happening here (I think, the OP has not told us what the "fault" is for the inverter.)
More usually I see 13.2 to 13.4 in warm temperatures. That gets us down to as low as 12.5--in which case the house battery bank will never EVER fully charge.
I do see 15.4 (throttled to that level) from my Blue Sky solar controller.
wolfe10 wrote:
Said another way, the alternator may be putting out 14.9 and the batteries ("downstream" of the diode-based isolator) receive 14.2.
