Hello and thanks very much for the reply. The original solar panel died 2 years ago so I replaced it. The one I installed has the following specs:
Power (max): 13.5 watts
Voltage (min): 16.8 volts
Voltage voc: 18 volts
Current (max) Isc: 500mA
Cells in series: 36 pcs
Panel size: (mm) : 383 x 360 x 25 (inches): 15 1/16 x 14 3/16 x 1"
Weight : 1.6 kg, 3 1/2 lbs
eBay purchase link: http://cgi.ebay.com/13-5w-SOLA...sidZp1742.m153.l1262
The panel worked great all last year, then the batteries cooked over the winter. That's why I assumed the charge controller had failed. Maybe they were cooking the whole time and I never knew it. I guess it was stupid of me to assume my coach would have a charge controller when it had a factory solar panel. I'm still learning about all this.
So is the consensous then that there is no controller and I need to install one? If so, can you recommend one for the above panel?
I'd be very grateful for any advice you could offer.