This is my choice for many of my DIY solar lights. I glued the included rubber plug with Loctite go 2 glue and applied the glue where the wire exits the bottom of the solar panel. There were no problems with water. I do this because the wire will withstand some water ingress, but the connection between the wire and the solar tank will not. Product descriptions explain what is good with or without water. Only had to be replaced after 3 months of use, nosy people problems, no product problems.
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