Yes, Mr. Murphy always shows up sooner or later.
I personally think that SOB is out to get me.
Forgetting about self discharge, higher amps at lower battery V, better power retention with PMW, etc...
The trailer is for storage and lighting it should be neglectible, say 5AH.
The 5 lights for 4 hours with 11W Solsums for example, plus 10% = 20AH/Day.
A 105AH battery should last 5 days without charging.
A 32W panel like the US32 has a amp output of 1.96A x 5 hours per day.
Boy Scouts don't camp out much when it is cold (ie: low solar insolation),
probably because of the leaders / fathers, so 5 hours seems reasonable.
That is 10AH/day charging.
With 8 days of use at 20AH/day = 160AH.
With 8 days of charging at 10AH/day = 80AH.
With 5AH total trailer lighting use,
and a 105AH battery.
That still leaves the battery about 20% charged.
A good, full charged 105AH battery and 32W PV should be good for 10 days before the power runs out.
With a 32W PV and 3 days use per trip, the battery should stay above 70% SOC.
For the Boy Scouts, it is $250 or $650. The $250 system will work fine, IMHO.
I bet the $650 system will not be purchased.
A particularly nasty weekend will give the boys lots of time to try Norm's $25 bike/treadmill battery charger.
What is wrong with my figuring?
G-