12V mystery
Here's one I cannot figure out. I have two AGM group 31 battery's that are about four years old. They stay plugged in when at home and I have a 2020 Trimetric monitor which I monitor often whether on the road or here at home to see if there is any change.
Now the mystery, last week I drove eleven hours with a stop over night after seven hours. The monitor was reading 12.6v when I hit the road. I arrived at my destination and spent the night where I was going to be parked for three nights. Wed. night I used LED lights, pump a little and the fridge was on 12v. Thursday morning the reading was 12.5 and the monitor stated I was at 99%. At noon I came back to the rig and the volts were at 12.5 and 95%. At 5pm I returned and my reading was 11.2v. Now nothing was on, no lights, no pump no furnace just the fridge and CO/LP detector.
I ran the genset for three hours knowing it was not going to recharge the batterys in that amount of time. At 0500 I got up and the fridge was flashing and the batterys were dead again, which was expected.
I hit the main switch and used my third battery a group 27 which is on a separate circuit. That battery lasted through Friday and Saturday.
On Saturday night I was at a State Park and plugged in. The batteries took the charge and I kept them charging until Sunday evening. I hit the main switch because I wanted to see if they would now hold the charge, and they did straight through Tuesday morning when I hit the road. Drove two days home and did not plug in until Thursday, again to see if the would hold the charge, and they did.
So, here what do you 12v guru's think might have happened as this has never occurred in the 13 years that I have had the rig.
Now the mystery, last week I drove eleven hours with a stop over night after seven hours. The monitor was reading 12.6v when I hit the road. I arrived at my destination and spent the night where I was going to be parked for three nights. Wed. night I used LED lights, pump a little and the fridge was on 12v. Thursday morning the reading was 12.5 and the monitor stated I was at 99%. At noon I came back to the rig and the volts were at 12.5 and 95%. At 5pm I returned and my reading was 11.2v. Now nothing was on, no lights, no pump no furnace just the fridge and CO/LP detector.
I ran the genset for three hours knowing it was not going to recharge the batterys in that amount of time. At 0500 I got up and the fridge was flashing and the batterys were dead again, which was expected.
I hit the main switch and used my third battery a group 27 which is on a separate circuit. That battery lasted through Friday and Saturday.
On Saturday night I was at a State Park and plugged in. The batteries took the charge and I kept them charging until Sunday evening. I hit the main switch because I wanted to see if they would now hold the charge, and they did straight through Tuesday morning when I hit the road. Drove two days home and did not plug in until Thursday, again to see if the would hold the charge, and they did.
So, here what do you 12v guru's think might have happened as this has never occurred in the 13 years that I have had the rig.
