Rural Mexican power... [RE-wrenches]
Jim Duncan
ntrei at earthlink.net
Sat Jul 8 14:00:27 PDT 2006
Wrenches, I got a call from a university professor in a nearby college
town. He had been working in a central Mexico village and, some years
ago, someone had installed PV on a number of the buildings. Apparently
time and lack of maintenance had left most or all the installs not
working. His plan was to install a new one as a model system then apply
for grant money to install more.
So he called me to come up with a prototype before his departure in
about 2 weeks. I said I could not have a completed system designed,
tested and ready to ship in that short a time. I suppose I could do most
or all of that if I applied myself but I sensed some charity work coming
so there have to be other priorities mixed in there, like paying jobs.
He agreed that the timeline was a little short and he could wait a bit
longer.
So, rather than re-designing the wheel here I thought that someone out
there has a workable design in a file folder somewhere that could be
reused in this situation. He was not too clear on what the loads might
be. I figured that would be decided by the charge controller, when the
battery sags, power goes away. (Trial and error can be a cruel teacher.)
On top of that, he insisted that he could find batteries there rather
than taking the correct ones along. I suspect that there are probably
not a lot of deep-cycle batteries available out in the badlands though I
have been wrong before. I don't think the importance of the battery
completely sunk in with him in our conversations and emails.
Finally, he thought roof mounted modules would work best but a pipe is
pretty much a universal mounting spot. So I am open to any and all
designs up to 200-300 Watts.
Thanks in advance for any suggestions. Please contact me offline unless
it is wisdom worth sharing. Also the phone cable in the easement here
was damaged and is being replaced next week so messages and replies may
be delayed.
Jim Duncan
North Texas Renewable Energy Inc
Fort Worth, Texas
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