Originally Posted by rywnc
We have a new 15 watt portable battery charger. How reliable are battery chargers ...are there better, more efficient ways short of using a generator to recharge batteries if boondocking? We have two 12V
batteries on our International.
A 15 watt solar panel, at best, will keep the batteries "topped off".
The 2 batteries have a total available amps of about 200.
Your charger, at full sun, will charge at the rate of 1.25 amps, per hour.
Even at that, the charging rate is dictated by the position of the sun on the solar charger.
When the sun is at an angle to the charger, the charging rate decreases.
I would not depend on that charger to do anything more than keeping the batteries topped off, and then only when you are drawing "zero" current.