The OP is asking about portable QRP usage, so car batteries are right out, SLA are an option but heavy, LiFePO4 batteries are likely a better choice.
As for a solar panel, a three-panel array is not practical, there are quality brands out there, Bioenno seems well-regarded here, but I think there's no way to provide specifications for solar panels given the number of variables involved. I would suggest going with a well-regarded brand, over-provisioning the solar panel to the extent its practical to deploy easily in portable use, and realize that you can't run just off the solar panel - you'll need a battery and the solar panel/array you deploy is just to hopefully maintain the charge on the batteries.
Good luck, please share your decision with us when you decide,
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On Apr 27, 2024, at 07:43, Joseph Wonoski via groups.io <N1khb@...> wrote:
?SLAs are actually made for deep cycle use. Depth of discharge affects lifespan to a degree however.?
? ?Car batteries are a different animal designed for short duration starting only.
Joe N1KHB?
On Sat, Apr 27, 2024 at 5:30 AM, Mike EI9FEB
<ei9feb@...> wrote:
Many quote the maximum output at solar noon, midsummer, clear sky and the panel angled at the sun.
Obviously this can be even x10 the actual output even on a good day in the other half of the year unless you live closer to or in the tropics.
Three 100W panels, special charging electronics and a suitable battery system. Car batteries are best value but heavy. Li batteries may take deep cycles well. NiMH less tricky, can be similar volume capacity to Li, but much heavier and expensive other than AA size. Lead Acid gel don't like repeated deep discharge.
Likely for a rig the duty cycle is 1:5 unless in a pile-up/contest.·
