I recently installed 6 new LIfeline AGM house batteries. I also replaced all of the connecting cables between batteries. The Magnum ME-RC was set to the correct setting for Lifeline AGM batteries which is AGM2. The Smart Combiner was set as follows: Connect voltage %u2013 13.5V; Low voltage disconnect %u2013 12.7V; High voltage disconnect 14.3V.
We are on our first trip in which we have to dry camp. After the first night on battery power, we got up in the morning to discover that the battery voltage had dropped to 11.5V. According to the Lifeline manual, this is 100% discharged. Nothing was used in the coach except the LED lights for short periods of time. The refrigerator was plugged in separately to a 110V extension cord so it was not drawing any current from the coach.
I began checking for the cause and I disconnected all cables and checked each battery with a load tester. Each of them held a charge under load, although a few were at the bottom level of good/or top of the weak range. All of the connections were replaced and tightened properly. I looked for other obvious problems with cables and found nothing unusual. Other than the things you can't shut off, such as the smoke and propane detectors, nothing was on to use either 12V or 120V power.
I started the generator and fully charged the batteries (13.8V on the CMP) and according to the Magnum Remote, they were at 13.2V when I turned off the generator. Within a few seconds, it had dropped to 13.0V. I checked the CMP and it showed no amp draw. I switched off both the chassis and coach battery switches in the battery bay to eliminate any obvious draw on the batteries. At one hour I turned on the switches to check the battery state on the Magnum remote and the battery voltage had dropped to 12.6V. I checked again in two hours and it remained at 12.6V. For the next hour I left the house battery switch on. At the end of three house it has dropped to 12.4V. With my previous flooded Trojan batteries, I would only drop a few tenths of a volt overnight.
I have already checked other posts on this forum along with other sites on the internet to see if there was anything that would shed some light on the issue. So far, I am at a loss.
Does anyone have any suggested protocol for troubleshooting the problem? I am pretty frustrated at this point.