Solar charging Li ion batteries

by jr10 on Fri Feb 15, 2013 3:28 pm

Hi Newbie here.
I am attempting to build a portable back-packable solar recharger. I have a 12 volt 2.8 Amp Hr deep cell battery. I wanted to use this as a storage device to recharge 3000mAh Li-ion eighteen six fifty
batteries. Since you have been out of the USB / DC / Solar Lithium Ion/Polymer charger - v1.0 id 390 for awhile, I was wondering if the USB/DC Lithium Polymer battery charger 5-12V - 3.7/4.2v cells
ID: 280 would work? I intend to use your Large 6V 3.4W Solar panel - 3.4 Watt id 500 solar panel.
Any input or help would and be greatly appreciated.
Thank you for your time.
Jay
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Re: Solar charging Li ion batteries

by adafruit_support_bill on Fri Feb 15, 2013 3:37 pm

The solar charger is really the better choice. Using a conventional charger for solar charging typically only works in ideal conditions. Too much load or a passing cloud will cause the panel voltage to collapse and disrupt the charge cycle.
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Re: Solar charging Li ion batteries

by jr10 on Sat Feb 16, 2013 12:23 am

adafruit_support wrote:The solar charger is really the better choice. Using a conventional charger for solar charging typically only works in ideal conditions. Too much load or a passing cloud will cause the panel voltage to collapse and disrupt the charge cycle.


Thank you. Any update on when the solar chargers would be back in stock?
Jay
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Re: Solar charging Li ion batteries

by adafruit_support_bill on Sat Feb 16, 2013 7:18 am

These sell out faster than we can make them. The best way to make sure you get one from the next run is to sign up for notification. You will get an email as soon as they are back in stock (but move quickly. They have been known to sell out in just a few hours!)

The good news is that we should have another pick& place machine on-line soon to increase our manufacturing capacity. :)
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Re: Solar charging 12v deep cycle

by jr10 on Mon Feb 18, 2013 11:42 pm

Hi,
I was also wondering if 2 of your Large 6V 3.4W Solar panel - 3.4 Watt ID: 500 solar panels would be enough to charge a 12v 2.5 amp hr deep cycle battery?
Thank you
Jay
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Re: Solar charging Li ion batteries

by adafruit_support_bill on Tue Feb 19, 2013 10:02 am

I don't know a lot about charging lead-acid batteries. But I believe that two of those panels in series could handle it. You will probably need some blocking diodes to protect the solar panels from reverse current should they become shaded.
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Re: Solar charging Li ion batteries

by jr10 on Tue Feb 19, 2013 12:55 pm

adafruit_support wrote:I don't know a lot about charging lead-acid batteries. But I believe that two of those panels in series could handle it. You will probably need some blocking diodes to protect the solar panels from reverse current should they become shaded.


Thank you for your help :)
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Re: Solar charging Li ion batteries

by EasternStarGeek on Wed Feb 20, 2013 9:26 pm

The following link is for a very good source of reliable information regarding all things battery!
http://batteryuniversity.com/learn/

This link specifically addresses charging techniques for Lead-Acid batteries:
http://batteryuniversity.com/learn/arti ... id_battery
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