Had some time tonight after work to play around with some of the new stuff. So, this cheap ass solar panel from eBay wasn’t quite as described. Reached out to the seller, and though they responded quickly, they really didn’t know much about what they sell. Yeh, and English definitely wasn’t their first language, despite shipping out of California, responses came in around 2:30am and needed my Ingrish translator to figure out they didn’t understand my question. So it was listed as “100w solar panel with 2 USB plus 12v & battery clips.” Welp, it did come with a ciggy plug and some tinfoil alligator (more like tiny as hell salamander) clips... but... no place to attach them, lol. All there was on the junction box were 2 USB ports. They did revise the listing after I purchased to show output of 5.5v @ 1500ma. So I asked wtf? They were clueless and were going to “ask me our supply” which I took to mean “ask our supplier.” For $35, I told them forget it. Popped off the “junction box” and looked at what I was dealing with. Two nice tabs coming out of the panel with blocking diodes, connected to a PCB with that only had the USB ports and some ICs
Disconnected after the diodes, put it in the sun, connected my DMM to the diodes and BAM! 22v DC. Clipped on a couple of leads to a big resistor I have kicking around and got 8.3a in full sun 90 degrees to the panel. WOOT! Wired it up with a 20’ run of 10ga fine strand copper wire soldered to the diodes, wrapped in that expandable nylon wire sheathing, terminated with a SAE connector. Tested in the shade about 7:30 tonight and still got over 18v over the 20’ run of cable
I have a weatherproof passthrough SAE socket that will go on the back of the bus by the left tail light to feed into the solar controller. This weekend will install that, mount controller, set up the ammeter, etc. Even is this thing shits the bed in a year, worth it just for the education and I’ll have the groundwork in place for a better panel and controller.
Cost:
Cheap ass panel - $35.99 shipped
Cheap ass “50a” PWM controller - $12.29
100’ 10ga fine copper strand wire - $17.48 (used half)
SAE connectors - $13.79
50’ nylon 0.5’ expandable sheathing (plus 50’ 0.25 roll for other stuff): $10.49
Total - $90.04
Playing around with something new - $ priceless.