I have been using a Ecoworthy 100W portable unit this winter and have had no problems. I知 positioned in the storage lot where I store the coach in such that I only get morning sun, but even with the limited sun time its kept the batteries charged. I do visit the coach a couple of times a month to run the generator and engine for a half hour or so, but at every visit, the batteries have been at 100%.
Initially I was using the charger that came with the panels, but decided to add a Bogart SC-2030 charger to go with my Trimetrics battery monitor. I was concerned that the charger that came with the panels was too simple of a charger for long term connection to the batteries. The SC-2030 has a lot more smarts relative to knowing what my batteries need and so far this winter I haven稚 had to add any battery water.
I have all of the parts and pieces to put 200W of flexible panels on the roof this spring. However I知 going to keep the pig tail I installed to connect the portable unit to the SC-2030 so I can continue to use the portable unit to supplement the 200W panels when we are boondocking.
2017 Thor ACE 30.1
2017 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain
RVi Brake 3