Originally Posted by tawoo
I also have a solar panel on my TT. I mounted it on the roof and connected it to a pair of 12v wires in my refrigerator compartment. The thing has worked flawlessly all summer keeping the batteries charges to 13 volt. Now, however as soon as the sun goes in or a cloudy day the batteries discharge quickly. One battery is one year old the other two years old. Any ideas why they are not keeping the charge? PS they are full of fluid.
There are a lot of possibilities.
- First question is, what are you using to drain the batteries? Regular light bulbs, LEDs, inverter, Tv...
- No solar charge controller between batteries and panels.
- The batteries are not the same age, what happens is the older battery has a different internal resistance than the newer one, which causes different charging characteristics. The older one will drain down the newer one to its voltage level.
- Batteries are not the same mfr, make, model, Ah rating.
- You need to get 14+ VDC to properly charge the batteries. 13VDC is just the level to maintain a voltage.
- Bad connection between charge controller and batteries
- Battery that is no longer capable of holding a charge.
I would venture to say that they are just to old and have reached their life-cycle end.
When you purchase TT batteries they should be the mfr, model, Ah rating.
- Charge up both batteries (full charge 14+VDC)
- Disconnect the batteries from the TT and each other (assuming they are 12VDC batteries). You want to make sure there is no LOAD connected to them.
- Wait about 2-3 hours and take a voltage reading on each battery, and once again in 5 hours. You will probably notice one of them has a higher/lower voltage.
- The best way to test them is to go to an automotive parts store and get a hydrometer to measure the specific gravity of each cell ( write them down)
If the TT is not in the DIRECT sunlight ALL day, your not going to get a lot of power out of the 100 watt panel. The only time that you will even come close to 100 watts, will be at the peak solar time of the day (between 12 and 1ish) before and after that you may be in the area of 50 - 60%.
I would recommend that you purchase two new TRUE deep cycle batteries (they do not have a CCA rating) for any extended dry camping. Better to be prepared than have to worry about it while camping.
Just my thoughts
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
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