question

Hello @samooore. Just a couple of things I'd check over. What was the voltage measured after the splitters with both panels? Could one of the splitter inputs be faulty? Secondly, MPPTs do not always react immediately as it is seeking the maximum power point so maybe with full sun things be sorted. Finally, have you set the correct battery voltage?

@samooore, I concur with @ejrossouw; if you've tested each panel individually with the expected results then the fault must be in the "Y" connector. I will add one consideration, which is just to make sure to independently verify the polarity of both panels; theoretically you've already done this while you were testing the individual panels, but it's worth a triple-check.

you don't mention your soc if your batteries are near fully charged nearing the end of absorption or in float I would expect the controller to do exactly what you describe . if the current with both panels hooked is the same or close to the current with a single panel I would suspect your very close to a full charge. if the controller only requires 75 watts because of the above and you hookup a second panel it would still only need 75 watts that would now be divided between two panels or 37.5 watts each panel

This is a learning experience for me.

After checking the connections I believe the system is working normally. Yesterday I stressed the system by turning off the battery charger and engaging the freshwater pump, inverter, refrigerator, and microwave.

While I did this, I had the VEconnect app going and to my surprise, while the system was under load the watts went down to 4-5. The system recovered in some time as the load was eased.

If you look at the data from the CVS export you will see where what's been going on.

Thanks for the input.