To whoever is interested, The electrical for our van has been battle tested through many different climates so far.
My family has been touring in it for about 3 months now. We travelled most of the American Pacific Coast and now are touring through the Midwest. I never ended up connecting shore power just to see whether it was something we needed or not. We've been relying completely on the 400W Solar and the 40AMP Onboard Battery Charger. Before finding sunshine we found we had to move pretty frequently to charge the battery but being in the Midwest (AZ, UT, NE) we haven't had to worry about power at all.
The system works really well and I'd just like to extend my thanks to everyone on this forum who made it possible. I honestly couldn't have done it without your help.
Thank you, Thank you, Thank you.