You will definitely save weight by going to a single panel (or even a folding 2 panel system). The Renogy 50 watt portable with controller
is the same price with free shipping from Amazon. The Renogy weighs 18 lbs, the Harbor Freight 52.3 lbs(although this is shipping weight - unpacked it is probably a bit less). Dealing with three individual panels is more of a pain than a suitcase pair.
The controller for the Renogy portable system includes a diode to prevent nighttime back flow; I don't know for sure, but I suspect that the Harbor Freight controller does as well. I camped with a guy at Quartzsite last winter that never added a diode or disconnected his Harbor Freight system & didn't have a battery drain problem (although it didn't keep up with his usage - he had to run a generator
every 5-6 days).
Whether either will be enough to let you dry camp for an extended period depends on your usage. If you haven't switched to LED lighting
, that would be the first step since LEDs draw about 1/10th the current for the same amount of light
as incandescent lamps. With LED lighting
& your description of use, I suspect you would be fine with 50 watts, particularly in portable panels that can be aimed perpendicular to the sun.
I am a fairly heavy user of electricity - an average of 35 - 40 amp hours per day that includes using an inverter to make coffee, toast, etc, a cell phone amplifier & hotspot, many battery chargers, a very hungry laptop, and over the winter, lot of furnace
I started with a single roof mounted 95 watt panel which didn't keep up. I currently have an additional 100 watt panel on the roof which, with the original does fine in the summer with long days & high angle sun. During the winter I have an additional 160 watt portable panel that can be aimed at the sun. I needed all three at Quartzsite this winter.