Fun project - use an Arduino microcontroller for this, run it from a small solar panel, measure the voltage with a voltage divideron the analogue input, and use one of the Arduino's outputs to close a contactor to short a module when V>590 or so. Cost would be about $60.
On Thu, Nov 29, 2012 at 10:05 PM, mac Lewis <[email protected]> wrote: > Larry, > > You could make a device that does this via relays by either sensing temp, > single panel or string voltage, and takes a panel or two out of the circuit > when necessary. Maybe there is a product made for this already available. > > Good luck > > On Thu, Nov 29, 2012 at 6:53 PM, Larry Crutcher, Starlight Solar Power > Systems <[email protected]> wrote: > >> Wrenches, >> >> I seem to recall seeing something about a device for PV string >> over-voltage protection by bypassing a module. I can't find any info by >> Goggling. >> >> Some customers in the FAR north, ay, can see > 40° below zero with bright >> sun and snow reflection. I want to be able to switch off one or more >> modules in a string for protecting the controllers. >> >> Thank you, >> >> Larry Crutcher >> Starlight Solar Power Systems >> >> >> >> >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> >> >> > > > -- > > > > Mac Lewis > > * > > "Yo solo sé que no sé nada." -Sócrates > * > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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