Solar
 

My name is Doug in Columbia Ca. I have an RV in mountains with small (150 watt) solar system. I want to increase it to 400watts. Need to find panels to fit my budget. I am retired university prof.

Welcome to the forum.

DM 145w Polycrystalline Solar Panel (2 Pack):Amazon:Patio, Lawn & Garden

Those are pretty good panels 350 to your door for 290 watts. I've got a set and they seem to be good panels they also have great reviews online

Welcome to the site Doug.

The price of solar has dropped so much that you can buy USA made panels that have the standard 25 year warranty for about the same price as no name Chinese made panels from a company that no one has heard of and that might not exist in 6 months.
A year and a half ago the price of solar was nearly double what it is now.

I'm not sure what aspects you need help with. If you are looking for solar PV panels, here's a link
Free Solar Panel Price Survey | EcoBusinessLinks

Keep one thing in mind though, there are costs associated upgrading that might be more than the panels themselves, charge controllers that handle the input voltage of your system, for example.