Results of my power bank experience: As noted in previous post, I tried to assemble a ups using a 5v battery pack being charged from a 25w solar panel with back up from a 110vac. Failure: battery was not enough, It was not consistent in keeping the 5v output during varying charge/discharge/starts/stops. I don’t know exactly what/when the DC quits… I only messed with it for 2 days…
My goal is for nominal 24+ hours on battery power w/auto recharging when the sun is out
So I am on to round two (or three) … the lesson… must go to higher volt battery
Battery 12v-9800mah- amazon B00R3VDL46
Regulator: DC-DC Buck Converter 3A 5v - amazon B016XI9CZQ
Since I erred and bought a 24w solar panel w/integrated 5v regulator I have to add
a 5v to 12v booster so I can recharge my new 12v battery … lesson to be learned here…
Of note the li battery has an expected voltage droop during discharge (from 12v down to 8v), the little 5v regulator seems to deal with this ok.