Re: CAT-5 buried, exposed to sun

MassiveProng wrote:

On Sun, 04 Feb 2007 17:36:49 GMT, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> Gave us:


MassiveProng wrote:

On Sun, 04 Feb 2007 02:15:01 GMT, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> Gave us:



Sure solar would work. You only need 24V/250mA per valve for about 10-15min, or 30min on a drip system. And you only need that when it's hot out, meaning the sun is pelting the area. BTW they make special solenoids that just need a turn-on pulse and then hold. Requires a turn-off pulse as well but those are made for exactly that market, solar-powered irrigation. AFAIK they fit regular LawnGenie and similar valves.



But to charge EACH head, you would need an array on EACH head.


If you don't want wires you have to do that anyhow. There are lot of yards between the valves, plus lots on huge boulders in our case.


The inductive charging bot would only need to get within 5 feet of
each head, and could charge more than one at once if they are proximal
enough.


You can't transfer much energy across 5ft, at least not without getting into trouble with the FCC. I've done inductive transfer and anything past an inch is tough.



Remeber, the thing you are charging is the battery for the
24V/802.11G device. That means what? A solar power mast at each
head? Methinks not.


And what opens the valve when the 802.11G says "open, open, open"?


The battery that was kept charged by the roving bot.


Our rocky terrain would make that bot fail in no time. I don't trust mechanical devices much. At least not after having to repair our pool sweep every other month. I hate that thing ;-)

--
Regards, Joerg

http://www.analogconsultants.com
.

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