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Solar charging a power bank
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#1 (permalink)      9/12/2013 1:52:59 PM   + tips
Broodmaster
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Solar charging a power bank
What is needed to charge this http://www.fasttech.com/products/0/10002784/1207400-enb-218650-li-ion-battery-usb-emergency-charger ENB 2x 18650 with this solar panel? Would it be a voltage booster, two of these in series(8V) with a resistor, etc.?

Edited on 9/13/2013 at 8:28 PM. Reason: edit
#2 (permalink)      9/15/2013 4:22:31 AM   + tips
r3l1c
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I think what you need to do is to keep this baby on 4V but increasing the Amperes
#3 (permalink)      9/15/2013 10:25:15 PM   + tips
Broodmaster
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Hello r3l1c, I agree, if connecting the panel directly to a Li-ion, but the ENB needs a 5 volt input so I don't know if ~4 volts would commence charging. To get the current needed, as you are suggesting, I think I would need to connect at least 7 of these in parallel to match the current of a cell phone wall charger. Thanks for your response.
#4 (permalink)      11/17/2013 6:59:44 AM   + tips
dirtbasher
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I would use 4 panels 2s2p, with a regulator to get 4.5-5volts, this should provide 1-2 amp charging depending on solar strength as the watt output of the panels will vary during the day peak being at midday , and also the angle of the panel to the sun.
Power loss does occur with solar panels , so even 2s2p might not be enough but should slow charge the unit
#5 (permalink)      11/17/2013 7:07:52 AM   + tips
dirtbasher
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Apologies , didn't realize the low amp rating , you will need many in parallel to achieve a decent charge rate of 500mA