Thanks! So, I just checked it in blackout (night) conditions and it’s pulling 2.12 Watts. I did some back of the envelope calculations and came up with the following if I want to be able to go 48hrs with no charging and not run my battery down below 50%.
2.12 watts was the highest with it actively streaming (radio on), and IR’s lit up. I add in a fudge factor and plan for 2.5 watts worst case. At 2.5 for 48 hours we’re talking 120 watt hours… I need to double that to size my power supply (battery) so it doesn’t discharge under 50%. I now need 240 watt hours minimum. If I get a 12v deep cycle AGM battery at 18AH ($35) I’m at 216 Watt hours max. That’s a bit low considering a few peak solar hours with clouds here and there, loss from electronic components, wire, etc. You’d be surprised how much you have to over design to account for passing clouds, angle of your panels costing you efficiency, etc.
So, I upsize to a 35AH ($60) which gives me 420 watt hours. I like this better because it accounts for these losses I can and can’t can’t plan for. Now I need to ensure I have a panel big enough to provide a healthy charge rate for my battery so it lasts a few years (probably 2 with a cheap deep cycle AGM from amazon). If I shoot for a c/10 charge rate I need to size my solar panel so it provides 3.5 amps . I could get a 75 watt pushing about 4 amps under IDEAL conditions for $80-$90. This should be OK, but I can get 100 watt pushing 6 amps for an extra $20. Throw in a charge controller ($10 PWM) or ($50 mppt), and we’re between $150 and $200.
This design gives me a very good comfort level that I won’t have to worry about it for at least a year (probably 2) unless a squirrel or bird roughs it up (which has happened). I will confirm my load calcs with my kill a watt for that 48 hours to get a truer number under normal use and adjust as necessary. I will check those links for pricing though. I appreciate it!