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I bought this to extend the reach for my Jackery 100w solar panel as the included cord is only 6ft. Out of the box this didn't work as the cable connector has a long protective plastic sheath that prevents a solid connection to the Jackery 8mm cable. I used a dremel to shear off the plastic sheathing enough so that the Jackery cable connector would fit properly. Worked perfectly. I was expecting to notice some output loss from the solar panel when adding in an additional 15 feet of connection, but there wasn't any. Testing with and without extension I was getting 60-65 watts output in regular sunlight.
I recently purchased a 100 watt nomad solar panel for my Yeti 400. The attachment cord was so short the yeti had to be placed right next to it, or under it. This cable allows me the flexibility to place Yeti in a more secure place. Just a note about DC current, it looses power fairly quickly with distance (why we don't have DC powering towns and cities), so only buy the length of cable that you need.
Does the job its expected to do. Only improvement I would recommend would be something that latches the two ends together a bit more securely. I tripped or bumped the wire occasionally, and the plug would come undone. Think I'll add two velcro straps to each end and then just join it that way to protect against that (especially if plugging into a panel on the roof!)
The cable is helpful to have to move my portable solar panel around to the sunniest spot, but the 8mm end is about 2mm shallower than the standard, so it comes loose from my "solar generator" if anything jiggles it.
Works perfectly as expected, but if you use it with a Jackery solar panel, you will need to cut off about 1/8 of an inch of the female plug. The male plug on the Jackery is not quite long enough as is.