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Old 11-24-2018, 04:50 PM   #11
CJPJ
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Default Re: Trickle charge thru Lighter?

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Originally Posted by wwjase View Post
Hello, and thank you. Could you please offer a few more details? I'm asking because I found solar power trickle charger by Suaoki (I have liked other products from them). It's an 18w panel, but more curiously, it recommends to unplug it at night in case it fails and begins to draw off the battery rather than recharge. That of course is not convenient. Additional research tells me people have added a controller to circumvent that potential problem.

Questions 1) what panel size has been successful for you, and 2) does yours have its own controller and/or did you add one?

Thank you kindly.
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Old 11-24-2018, 05:26 PM   #12
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Default Re: Trickle charge thru Lighter?

All you really need to prevent back-flow is a diode ... you don't really need a "controller".

An 18 watt panel supplies 1.5 amps of current at 12 volts, so a Schottky diode capable of 2 or 5 amps would be the best choice. "Schottky" (a technology, not a brand name) diodes have relatively low "forward voltage drop", so they won't steal much power from the solar panel.

Something like this: https://www.mouser.com/ProductDetail...WiiJklLA%3d%3d at $1.44 each.
If there's a Fry's Electronics near you, they'd probably have something similar ... it could be soldered in-line with the panel's current wiring (snip one of the wires, insert diode (properly pointed), solder the leads and wrap it in tape).
Look for a "reverse voltage" of at least 20 volts and a "forward current" of at least 3 amps.

"regular" solar panels (like the Renogy or Grape Solar) have bypass diodes on the panel... sourcing one of those diodes would work. (such as a friend throwing away a damaged panel)

--dick
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Last edited by autostaretx; 11-24-2018 at 05:29 PM.
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Old 11-25-2018, 02:50 PM   #13
Aqua Puttana
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Default Re: Trickle charge thru Lighter?

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Originally Posted by wwjase View Post
... but more curiously, it recommends to unplug it at night in case it fails and begins to draw off the battery rather than recharge. ...
To me that indicates that it is ok unless it fails. They don't say to unplug it during cloudy days or while shaded do they? If they don't mention that, a properly operating unit will not discharge your battery.

Are there any problems related to leaving it connected mentioned by actual users in their reviews?

I would ignore it as legalese/marketing speak for lawsuit avoidance.

vic
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