My 04 Dodge Ram Diesel sits for weeks and months without being driven. Lesser solar chargers weren't keeping the batteries topped off. This one does. I just got back from checking after 90 days parked and the batteries were at 12.6 volts. With the internal battery charge controller I don't have to worry about overcharging either. I just lay it on my dash and plug it into my power port (cigarette lighter) on the dash that's always powered on.Before this I tried a 1/2 watt, a two watt and a 5 watt solar charger that didn't do the job.
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