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309 posts

Ultimate Geek

#258709 16-Oct-2019 18:05
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Any recommendations on a small-ish solar panel that would have a USB output on it?


Looking at powering a small wifi camera for outdoors that theres no nearby power source, thinking solar could be the best option. According to the vendor website "The power consumption is between 2-4 watts, depending on whether Night Vision is turned on".





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16529 posts

Uber Geek


  #2338374 16-Oct-2019 19:01
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Consider using a small 12V SLA battery charged by the solar panel so the device it works at night, unless the camera has a battery. You can get 12V to USB car converters on ebay for almost nothing.


309 posts

Ultimate Geek

  #2339855 17-Oct-2019 15:40
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Anything you'd recommend?


Rather buy a complete set rather than needing to construct something.


237 posts

Master Geek

  #2340872 19-Oct-2019 23:31
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Jaycar sells these, but not sure of the quality.

3468 posts

Uber Geek


  #2340919 20-Oct-2019 02:11
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A 4 watt constant / 96 watts per day load would require an 80 watt solar panel and a 12v100Ah battery. 




My utmost cheapest design for you would be: 


Solar Controller  


Solar panel  






I would prefer you to be using a 120 watt solar panel and 12v-120ah or larger battery but i suspect you may be surprised how big of a system you actually need. If your thinking of a 7amp UPS / Alarm battery and a 20 watt solar panel, it will only take half a rainy day for the battery to go flat. 


4 watts uses 8 amps per day and for prolonged battery life you never want to let it discharge more than 50% otherwise you will damage it. So 8 amps per day x 10 cloudy days in a row = 80 amps x 2 = 160ah would be the ideal battery size. Even in sunny hawkes bay we can go 12 days in a row of mostly overcast cloud.  Thats where the solar panel running at 20% of its normal rating can help charge up the battery a little bit, and if you manage to get an hour of direct sun, the 80 watt panel will give you an extra 14 hours of run time. 




Running a 24v 1A power supply into a long Cat5 cable with 4 wires for + and 4 wires for - and a 12/24v to 5v switchmode (linear wont work) transformer at the camera might be looking quite cheap. 

Ray Taylor
Taylor Broadband (rural hawkes bay)

There is no place like localhost
For my general guide to extending your wireless network Click Here

380 posts

Ultimate Geek

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  #2340965 20-Oct-2019 10:00
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Won't this provide a good solution?



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