Solar power and batteries
Ronald Doctors wrote:
> ...believe me about needing clear sunlight!
> On rethinking this I would go with a lithium battery pack for
> all the power. The cost of good waterproof solar cells and
> all the headaches in using solar with recharging etc
> is far more than a good lithium primary cell system.
> ( PS I am building a solar array with full x-Y tracking
> using RF and STAMPS so i do have some experience )
Ron,
I'm thinking about the quantitative aspect of this--
Paul is talking about a systems that is going to run 24 hours a day at 10ma
average, from "late spring" to "early fall". So about 100+ days.
100*24*0.010=24 amp hours. That is a pretty hefty battery pack. A C-size
lithium cell is rated 5 amp-hours, and costs about $11 each. You would
need 10 of them in series/parallel(?) to get 6 volts at 25 amp-hours, at a
cost of $110 per installation. Then you have to throw it away. I agree it
would be a simple solution, but maybe not the cheapest. Am I missing
something? 24 amp-hour gel cells are pretty hefty and expensive too.
Tracy Allen
Electronically Monitored Ecosystems
http://www.emesystems.com
> ...believe me about needing clear sunlight!
> On rethinking this I would go with a lithium battery pack for
> all the power. The cost of good waterproof solar cells and
> all the headaches in using solar with recharging etc
> is far more than a good lithium primary cell system.
> ( PS I am building a solar array with full x-Y tracking
> using RF and STAMPS so i do have some experience )
Ron,
I'm thinking about the quantitative aspect of this--
Paul is talking about a systems that is going to run 24 hours a day at 10ma
average, from "late spring" to "early fall". So about 100+ days.
100*24*0.010=24 amp hours. That is a pretty hefty battery pack. A C-size
lithium cell is rated 5 amp-hours, and costs about $11 each. You would
need 10 of them in series/parallel(?) to get 6 volts at 25 amp-hours, at a
cost of $110 per installation. Then you have to throw it away. I agree it
would be a simple solution, but maybe not the cheapest. Am I missing
something? 24 amp-hour gel cells are pretty hefty and expensive too.
Tracy Allen
Electronically Monitored Ecosystems
http://www.emesystems.com
Comments
etc. A simple audio with micropower op amps would be an almost zero
current load <20 micro amps. The sound clapper could doubtless be made more
efficient by using a small motor and increase the pulse energy via either
gravity storage or a spring..
At least the lithium batteries would always be dependable.I am not so sure about
any solar systems in cloudy climates...
Date sent: Sat, 11 Mar 2000 15:44:07 -0500
From: Tracy Allen <emesys@c...>
To: stampers <basicstamps@egroups.com>
Send reply to: basicstamps@egroups.com
Subject: [noparse][[/noparse]basicstamps] Re: [noparse][[/noparse]STAMPS] Solar power and batteries
> Ronald Doctors wrote:
> > ...believe me about needing clear sunlight!
> > On rethinking this I would go with a lithium battery pack for
> > all the power. The cost of good waterproof solar cells and
> > all the headaches in using solar with recharging etc
> > is far more than a good lithium primary cell system.
> > ( PS I am building a solar array with full x-Y tracking
> > using RF and STAMPS so i do have some experience )
>
>
> Ron,
>
> I'm thinking about the quantitative aspect of this--
>
> Paul is talking about a systems that is going to run 24 hours a day at 10ma
> average, from "late spring" to "early fall". So about 100+ days.
> 100*24*0.010=24 amp hours. That is a pretty hefty battery pack. A C-size
> lithium cell is rated 5 amp-hours, and costs about $11 each. You would
> need 10 of them in series/parallel(?) to get 6 volts at 25 amp-hours, at a
> cost of $110 per installation. Then you have to throw it away. I agree it
> would be a simple solution, but maybe not the cheapest. Am I missing
> something? 24 amp-hour gel cells are pretty hefty and expensive too.
>
> Tracy Allen
> Electronically Monitored Ecosystems
> http://www.emesystems.com
>
>
> -- Easily schedule meetings and events using the group calendar!
> -- http://www.egroups.com/cal?listname=basicstamps&m=1
>
>
ron... the motor man...
Ronald Doctors
http://www.members.home.net/rdoctors