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I put the suction cups so they act like legs...and the panel which is about 12" by 12" just sits on my dash in front of my steering wheel. it has never moved . the cord runs down the center of the dash and plugs into the cig light port inside of my center console box located in the corner nearest the passenger. the port is always hot..this I tested with a volt meter and confirmed.
you will need some type of voltage regulation to prevent over charging the battery ....you will need 2 of these
I wired the 2 diodes in series ...they have a red and a black side...you have to wire them either black to black or red to red...doesnt matter which you choose. I terminal crimpted the joint that connects the two diodes and changed the lug terminal on the ends so that they fit the batter terminal tie down bolt. installed across the pos and neg battery terminal. trim the diode wires to give enough slack to connect. I put the finished product inside 2 layers of tube heat shrink. note the pic of the 2 diodes in the below pic. do not wire red/black to red/black or black/red to black/ red..that will drain your battery...must be wired red/black to black/red or black / red to red/black ....this means the diodes has to either point torwards each other or away from each other...not point in the same direction. I cant provide a pic since mine is heat shrink wrapped with heat shrink tube.
if none of the above makes any sense...ask someone with basic electronic knowledge to help. im sure there are dozens of ways of doing this so all comments (praise or attack) are probally ok too. this works for me. good luck.
Solar panels output DC voltage. This circuit is a crude way to create a semi-square wave from an AC voltage source, like a plug-in transformer. That circuit will not provide proper voltage regulation for a lead acid battery.
The solar panel you linked to on Amazon has a voltage regulator already built in. Why would you try to add anything to it? Just curious.
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