[pct-l] Solar chargers or Battery transfer device?

[Paul Robison]

comes down to how long between your resupplies.

the current solio charger only holds as much electricity as one lithium AA and 
takes 8 hours to charge even in dessert sun.  (our solio holds 2250,   an e^2 
lithium AA is 2975,  alkaline duracell procell is 2250)

don't be concerned about the total batteries for five months,  think of how many 
for 5 days.   one resupply ...
... the solar charger is a fixed weight ... with AA's you can take less on a 3 
days stretch and more on a ten day stretch.

we took a solar charger in 2010 and will not in 2011, we used the solio "tough" 
one .  worked great but simply wasn't worth the weight.


lastly,  lithium batteries weight 40% less than alkaline, and have 50% more 
electricity as even the very best procell alkalines.  are also unnaffected by 
any temps we would see.

i don't know specifically how many Mah your droid battery takes or at what 
voltage so i can't help knowing how many e^2's it takes to charge the thing 
fully once...   but do know,  it takes half a batteries power to charge the last 
20% ...   so, when using the igo,  charge to 75 or 85 %,   use,  then charge 
again with the same batteries, and you will get more juice out of them,  this is 
due ot the increased capacitance of the charged ions in your droidX battery... 
eventually because no matter how many MaH are available, they are only 1.5 to 3 
volts,   they will be unable to push power into the battery as efficiently.


our cell phone takes a 4.2V 950 MaH battery,  so 1900 MaH at e^2'd voltage ... 
meaning 2 AA's will charge our cell phone fully three times.

the iphone gets a charge and a half off 2 AA's if they are top quality lithium.


hope this helps,
~Outpost.




________________________________
From: Rick Wiggins <moosewig at yahoo.com>
To: pct-l at backcountry.net
Sent: Thu, January 20, 2011 7:36:55 PM
Subject: Re: [pct-l] Solar chargers or Battery transfer device?

I am having a hard time deciding between a solar charger like the Solio Rocsta 
or the PowerMonkey Explorer.  The other option is the Igo AA battery transfer 
device I have.  Obviously the light option!   They all would charge my Droid X. 
I am concerned about the amount of batteries I would need for the Igo over the 
whole trail.  The Droid X is the only device I would need to charge though!   

Any thought on this would be appreciated

MeanderMoose


      
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