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Rick H Parker

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Reply with quote  #31 
I think you got a decent chance of success but, there is no way to determine it forehand without the input parameters.

Most Automotive electronics are designed for at least 9V to 15V.  What is the Voc of the panel? 

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

lash

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Reply with quote  #32 
@stmbtwle yes, good luck.

I'll try to get hold of a solar unit when I'm back home latter half of next month, and see if I can get things up and running.
stmbtwle

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Reply with quote  #33 
Rick.

My thoughts too, but I can afford $7 for "science". I was tempted to order the buck booster, but it's already rated for the 22v Voc so we wouldn't be learning anything new, and I don't really need a 19v power supply anyway.

Lash:

I thought you had disappeared, good to know you're still interested! I'll post here how the adapter works out, it's about the cheapest rig I could find.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #34 
My biggest worry is the Voc (Voltage Open Circuit) of panel pushing the input components into breakdown mode (Electrical overstress). With no power consumption the panel voltage will rise to Voc even when it is connected.  If Voc is ~=<17V you got a good chance, after that your chances diminish as the Voc goes higher.  
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Rick H Parker
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stmbtwle

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Reply with quote  #35 
I've never seen a decent-sized PV panel with 17v Voc. A "trickle charger" maybe, but they won't run a laptop.

Anyway I'll test it with a meter before I connect anything to it. My guess the charge circuit of the laptop (designed for 19v) could handle 22v, so even if the adapter shorted there shouldn't be a problem. However if the thing somehow went into "overdrive" and started putting out say 30v, it could get "interesting"...

That's why we do experiments.

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stmbtwle

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Reply with quote  #36 
You were right Rick, it couldn't take the voltage.  When I first hooked it up and set it in the sun it looked OK, but after a couple minutes there was a loud "POP" (capacitor?) and it was dead.  So much for THAT experiment!  The voltage at the panel was 21.5v

The unit that failed was this one: https://www.ebay.com/itm/382370260699

The voltage converter discussed in post #29 might still work, it's rated for 22v input.



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Solar is like the wind. It may be free, but putting it to work isn't!
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Rick H Parker

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Reply with quote  #37 
The 21.5V exceeded the Breakdown Voltage of of something. The "pop" could be the packaging of any electronic component bursting.
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Rick H Parker
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stmbtwle

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Reply with quote  #38 
It was worth a try, anyway.

Took it apart to see what it was that "popped"... TWO capacitors on the input side had exploded.  Label on them was 16v.  

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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