Want to build a field charging box..

[Pathfinder075]

Originally I was building my camper van from a Transit and i was going to run 400W of solar into the 30A MPPT. Then the Transit fell apart. I now have a much smaller van, so 100-200w is probably it for mine, apart from those Perlight panels that measure 1.5m x 0.66m. But right now I only have space to maybe add a small compressor fridge. Still it has a bed, cooker and toilet. As long as you have the basics.

But on the transit i had secondary and tertiary charging capabilities, kind of a failover of a failover. I ended up with 6 solar panels on the roof. The 10w controllers are left over from that little experiment. One kept the vehicle battery topped up and the other charged a backup battery in case the other two failed.

For the two to three days I need the system for, PWM will be fine. If I was going off grid for a couple of weeks, maybe MPPT would be better, but at the same time, I did originally think about adding an external connector to allow a second panel to be used outside on the van to increase charging.