Good morning. Iām after some help to solve a puzzle. I have 2 135 ah gel batteries. Pulled up last night and they were showing a charge of 12.8 v. After watching tv they were showing 12.7. This morning when the tv is switched on they show 11.00 v then as soon as you turn the tv off the gauge jumps up to 12. 8 v instantly and now the reading is at 13.2 v as I type this. Obversly the batteries are flat and wonāt run anything but why is the read out showing good charge?
To answer original question.
The reason you get a reading is solar and residual charge.
While the sun is out....they'll be 'charging'. When they've copped charge....they'll have residual charge. For an hour or so. After that....they'll die a sad death.
You (your 12v system) should be feeling good now you've had them replaced.
Now.....to ensure you keep 'proper' charge up to them for the next however long of the battery life.
Thats what I did when my oldies died.....just made sure I understood everything there was to know about the health and longevity of deep cycle batteries. Then, hopefully the next purchase isn't 'only money'
