Magma Flex 50 flexible solar panels can be used almost anywhere.

1) I use a 50 watt panel on my 24 ft international truck and I just installed this due to the cold weather affecting the battery during cold starting procedures. 

2) Maintaining battery voltage will also increase the over all lifespan of your accumulator.

3)Modules manufactured for Magma Solar use the IP 67 junction box with shading diodes. Higher  quality double insulated 4mm square wire.