Update on Micro M+ solar charge controller

[Randy Cook]

In a previous post, I had given a link for a solar array controller  
kit, the Micro M+, from the ARRL Handbook 2007.   The link is now  
obsolete, and a new link to a kit is :

http://www.theheathkitshop.com/page24/page24.html

Thank you to Dr Werner Furlan OE9FWV for finding the error and  
locating the new link.

The Micro M+ seems to work fine with my small solar array and 7.5aH  
gell cells. I have seen low cost controllers at my local Fry's  
Electronics, but I have no idea how well they work.

73
Randy Cook
[hidden email]




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[Gary W. Marklund]

I've just ordered a M+. I'm using a 7AH 12v gel cell. I would appreciate
some suggestions for appropriate solar panels for this application.

TNX and 73,

Gary
KJ7RT

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[John Lonigro]

Gary:
I built one of those M+ controllers many years ago.  For Field Day this
year, I had two 5 Watt solar panels hooked up in parallel going to it
and then to a 5 AH gel cell.  After about 6 hours of operating (search
and pounce) with my K2 at 5 Watts, the micro M+ was cycling, indicating
the battery was still fully charged.  That was in full sunlight, only a
few days from the summer solstice.  Depending on how portable you want
to be and how much operating you intend to do, I would suggest a panel
in the 5-10 Watt category might work well for you.  The controller
itself can handle larger panels (higher current), but you don't want
more than about an Amp going into a 7 AH gel cell, to keep from damaging
it.  Also, naturally, larger panels (current-wise) tend to be less portable.

73's,
John AA0VE

Gary W. Marklund wrote:
> I've just ordered a M+. I'm using a 7AH 12v gel cell. I would appreciate
> some suggestions for appropriate solar panels for this application.
>
> TNX and 73,
>
> Gary
> KJ7RT
>
>  
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