Day two I’m quite happy with adding the second accessory battery to my truck. The extra reserve capacity seems to be really helping. While I concede the arrangement of the batteries leaves a bit to be desired, so far things have worked well. I have left the two accessory batteries disconnected from the alternator — all power is coming through the solar. But I can flip a switch, and connect things back to the alternator, but except for cloudy day or dark weather and extended drives, I doubt that is necessary. I haven’t noticed any hydrogen building up in the cap, and with the grommets pulled around the battery, I’ve not noticed much water splashing in despite the heavy rain we had this afternoon.