I ordered up a couple of small 100W solar panels to take with me for camping/astrophotography trips. I also ordered up the very cheapest Chinese made grid tie inverter ($50) which is both an MPPT panel controller and a backfeed controller just to see if it would work.

Sure enough the panels work well, generating 140Ws together at 5pm with low sun. I suspect I can get closer to their rated 100Ws each during the middle of the day.

For camping I’ll use a Victron MPPT Charge controller to charger lithium batteries.