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June 2010

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TechNet E-Mail Forum <[log in to unmask]>, Eric Kalgren <[log in to unmask]>
Date:
Wed, 30 Jun 2010 10:40:40 -0400
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TechNet E-Mail Forum <[log in to unmask]>, Steve Gregory <[log in to unmask]>
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Steve Gregory <[log in to unmask]>
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Hi Eric!

Here 'tis:

http://stevezeva.homestead.com/helmet.jpg

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric Kalgren
Sent: Wednesday, June 30, 2010 9:43 AM
To: [log in to unmask]
Subject: [TN] NTC - Solar Panels and small motors

Once upon a time, in the early 90's, I bought a pith helmet with a solar
powered fan attached to the front of it.  It was hands-down the coolest
hat on the block.

The small solar panel that powered the thing broke and I want to replace
it, but I don't know how much solar panel I need to run the motor.  I
know it's 3 VDC because it uses 2 X AA batteries as a back up supply,
but I don't know how much current I need to run the motor.

The old panel sat in a 2" X 2 1/2" pocket on top of the hat.  I've
Googled it and checked out a few options but nothing listed has the same
footprint.  And so I am punting to the TechNet to see if anyone might
have an idea of how to guesstimate the current draw of a small DC fan
without having an O-Scope handy.

I'll send a picture to Steve as well, just for kicks.

Thanks!

Eric Kalgren
Electrical Engineer
 
The Ferrite Co. Inc.
165 Ledge Street
Nashua, NH 03060
Phone 603-881-5234 X 153
Fax 603-881-5406
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