Originally Posted by BBB
to keep the Micro Monitor in the "happy zone"
(3-4 LEDs lit)
I think you might have missed the point I was trying to make.
If your solar cells are producing "charging voltage" AT ALL; Your MicroMonitor should be showing 4 "Happy Lights." (voltage in the camper over the non-charging voltage of 12.7 volts.)
Once the sun goes down, and the panels stop producing a voltage above 12.7 volts, you will get a better look at your voltage and battery capacity. Most likely it won't be 4 lights. Under load, it might not be 3 depending on how much battery power you have been using.
Not to say it is not worth the money or that it won't help. Just that 30 watts at full sun (you will normally get 75% of full sun wattage as an average for daylight) is just a bit over 2 amps. Enough to keep a full battery "full" under parasite load (with an infrequent light fixture use) but not to extend your stay very much at all.