Originally Posted by mikracer
Thanks guys, I think I'll just replace both batteries.
Just to clarify with the solar, I'm not trying to link the portable panel to the mounted panel and controller. Each system is its own complete system, I'm just wondering if I can connect the portable unit to the batteries to add additional charge.
8A X 12V=96W....so perhaps a 140W panel. There should be a sticker on the back of the panel.
You can certainly use both solar setups to charge if you want, and you could also wire the portable panels into the existing controller assuming that their specs are similar and you don't exceed the wattage rating of the controller.
As DaveB mentioned, it's not optimal to mix panels, although I've got a 120W kyocera polycrystalline panel in parallel with a pair of 100W renogy mono crystalline panels, so 320W total going to a single 30A PWM controller. The slight mismatch is likely decreasing my efficiency a little but my amps in direct sunlight has gone up significantly compared to just the 120W panel.
Post up the specs (or just post pics of the labels on the back of the panels) for the panels and controller; that would shed additonal light on your setup.