Anyone know anything about RV solar panels? I'm looking at buying one for maintaining my battery while dry camping. The descriptions for the different sizes all seem to be the same (vague). Why would I want to spend more to get the 18 watt version when the 5 or 10 watt does the same job? Do the higher watt units charge a battery faster? I am looking at this Battery Tender unit.
Any recommendations would be appreciated!