Choetech 19w solar charger mod

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pasha
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Choetech 19w solar charger mod

Post by pasha » Sun Oct 02, 2016 7:48 pm

I recently picked up this charger and quickly noticed that when I had cloud cover or lost direct sun that the panel was draining the power I had just gained. So I picked some diodes and installed one. This made a world of difference. Its a quick and easy mod.

https://www.amazon.com/Charger-Upgrade- ... 890&sr=1-1
I cut the stitching by the usb hub and unscrewed the hub to give me some wiggle room. Then soldered on a jumper wire.
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Then soldered the diode inline.
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Screwed the hub back down and applied a good dose of liquid electrical tape.
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Then applied more liquid electrical tape on the outside. Then some shoegoo to keep it in place.
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I didn't want to risk damaging the panel with the sewing machine so I used some more shoegoo to close it up.
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After everything was done I put it outside and verified that it was still charging then left it till dark. An hour after dark the phone still had its charge.
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Re: Choetech 19w solar charger mod

Post by AwPhuch » Mon Oct 03, 2016 2:28 am

Nice! Easy enough and one way current flow in a solar panel setup

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Re: Choetech 19w solar charger mod

Post by teotwaki » Tue Oct 04, 2016 7:01 pm

First, kudos for your detective work and installation skills.

What puzzles me is that decent solar charge controllers eliminate the need for the blocking diode.

Do you have your panel coonected directly to your battery?

Jim
My adventures and pictures are on my blog http://suntothenorth.blogspot.com

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Re: Choetech 19w solar charger mod

Post by pasha » Thu Oct 06, 2016 6:47 am

This panel has two usb outlets. I figured having a diode built in would just be common sense. I figure this mod may be needed on most low end panels.
I also did the same mod to a 5 watt powerfilm folding charger and it also showed a great improvement.
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Re: Choetech 19w solar charger mod

Post by teotwaki » Fri Oct 07, 2016 10:48 am

pasha wrote:This panel has two usb outlets. I figured having a diode built in would just be common sense. I figure this mod may be needed on most low end panels.
I also did the same mod to a 5 watt powerfilm folding charger and it also showed a great improvement.
Good to know that they have no blocking diodes in models with USB outlets.
My adventures and pictures are on my blog http://suntothenorth.blogspot.com

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Re: Choetech 19w solar charger mod

Post by Mr_Sheesh » Wed May 31, 2017 12:44 am

Hmmm, which diode, a nice Schottky for lower voltage loss I hope?

And a question, why no heat shrink or the like over the outside of the diode? (Maybe just a modification style thing, that :))
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Re: Choetech 19w solar charger mod

Post by Mr_Sheesh » Wed May 31, 2017 2:09 am

Also - There is a sneaky (i.e.rather neat!) way to use an enhanced mode FET to act as a diode, next to 0 volts loss, even as a full bridge rectifier; If anyone wants the info I can post it here. Efficiency is a nice thing, if you're in the Pacific NorthWet and only occasionally see that bright ball of light showing up for a few seconds (I forget what it's called...) FET method is about 100 times more efficient than the Schottky Diode, and can be made smaller, pretty easily. http://rs20.mine.nu/w/2013/02/using-mos ... rotection/ is a start - but not fully done, you can still kill that FET with static or EMP or the like...
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