Why Solar Panel Voltage Drops When Connected The Radio?
I own a Brunton Solaris 6 solar panel with the power rating of 12v 6W and short circuit voltage of 19v. We were living together just fine until I got a Yaesu Vx-8dr Radio. It charges on 12v 0.5A AC adapter. I decided to charge it with my PV but when I connect the panel voltage drops under 12v to 9v and Radio doesn't charge showing a External DC tag which indicates the lower voltage. The only time I get a charge with this setup is when the panel oriented to the sun perfectly in high solar conditions which is too perfect to sustain. I tried to wire it with 80 Ohm resister to limit the current but didn't help. How can I stabilize the voltage and also carry the solution in my backpack? Thank you for your attention and help.