Jack,
We need to know if you have a charge controller or not. With a 10W panel, many manufacturers just consider it a trickle charge deal and don't connect it to a controller.
A 125 watt panel will put down 10 amps. You don't want that going into your battery unregulated.
If you do have an existing charge controller, I'd be surprised if it could handle 10 amps...
Bottom line - you wont need to change everything, but we need to know what that light is that indicates charge and you may have to upgrade or add a charge controller.
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