Posted by Josepi on November 3, 2009, 12:24 pm
Of course because hot is the opposite of cold. Makes total sense.
Back for more trolling?
> Josepi wrote:
>> Perhaps the extra heat generated in the panels may melt the snow off or
>> dry
>> the rain? They may have been smarter than we give them credit for.
> Those two conditions would act as self limiting features, eliminating
> the need for shorting entirely. Shadow is mother nature's voltage
> regulator.
> mike
Posted by m II on November 3, 2009, 4:00 pm
Josepi wrote:
> Of course because hot is the opposite of cold. Makes total sense.
No. It's self limiting because a snow covering or rain, with it's
overcast skies, reduces greatly the output of the panels. With little or
no output, there can't be an over voltage condition produced. There is
no need to short out the panels at all.
I see shorting panels as a complete waste of power. The first thing you
can do with what would be wasted power is switch it over to run a small
compressor, with a huge tank. Air tools are good to have and compressed
air doesn't go bad.
After the tank is fully pressurized, you can start thinking about
heating water in the winter. How about COOLING antifreeze in the summer?
The waste power could be making things cooler with a heat pump as easily
as it heats things up.
I'm sure there are many other things the "waste" electricity could be
used for other than circulating it in the panels.
mike
--
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/ /\ \/ /'Think tanks cleaned cheap' /\ \/ /
/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/
Densa International
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Posted by Josepi on November 4, 2009, 8:15 pm
I guess you don't get out much.
Can you show us your circuits to type in your cooling compressor to your
grid-tie co-gen PV controller? telll us how you regulate the voltage so your
compressor doesn't burn out and switches over from your air pressure
compressor. Perhaps explain what you do for a compressed air supply when the
sun isn't shining?
Maybe a simple diagram how your flyback transformer operates as a grid-tie
co-gen when your brightnes is turned down on your TV?
No? I didn't think so.
Poor Wayne (God) defence. Why would he call you?
Josepi wrote:
> Of course because hot is the opposite of cold. Makes total sense.
No. It's self limiting because a snow covering or rain, with it's
overcast skies, reduces greatly the output of the panels. With little or
no output, there can't be an over voltage condition produced. There is
no need to short out the panels at all.
I see shorting panels as a complete waste of power. The first thing you
can do with what would be wasted power is switch it over to run a small
compressor, with a huge tank. Air tools are good to have and compressed
air doesn't go bad.
After the tank is fully pressurized, you can start thinking about
heating water in the winter. How about COOLING antifreeze in the summer?
The waste power could be making things cooler with a heat pump as easily
as it heats things up.
I'm sure there are many other things the "waste" electricity could be
used for other than circulating it in the panels.
mike
--
__ __ __ __ __ __ __ __
/ /\ / /\ / /\ / /\ / /\ / /\ / /\ / /
/ /\ \/ /'Think tanks cleaned cheap' /\ \/ /
/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/ \/_/
Densa International©
For the OTHER two percent.
Due to the insane amount of spam and garbage,
I block all postings with a Gmail, Google Mail,
Google Groups or HOTMAIL address.
I also filter everything from a .cn server.
For solutions which may work for you, please check:
http://twovoyagers.com/improve-usenet.org/
Posted by Gordon on November 2, 2009, 11:16 pm
>
>> Just thinking here. That's about all I can do right now.
>> About a future homebrew solar power system. And the
>> necessary charge controler.
>>
>> What is the common wisdom on charge controlers?
>> Is the panal just disconnected from the battery
>> when full charge is reached?
>>
>> Or can the panal be connected to a dump (diversion)
>> load.
>>
>> If a diversion load is used, is the battery
>> disconnected at full charge? Or is the
>> diversion load connected across the battery/panal
>> combination.
>
> In a perfect world, the charge controller would be smart enough to
> allow the panels to continue to supply just enough power to supply
> system loads while preserving the full charge in the battery.
> Sometimes residual uses are found for the heat from a dump load (such
> as water heating) but other than that, nobody has yet explained to me
> the reasons for a dump load in a PV system. The panel can hardly
> overspeed like an unloaded wind turbine. I have never heard of a
> panel being damaged by its own open-circuit voltage, but perhaps
> someone here will educate me.
>
> My controller seems to put a partial load on my panels when full
> charge has been achieved. I assume that the controller is just
> shorting out the panels intermittently with a PWM arrangement, thus
> the panel's internal resistance is serving as the dump load, but I
> don't (yet) know why they bother.
>
> Vaughn
>
>
I'm mystified by that too.
But what really gets me is the idea that there is power to be
harvested and it has no where to go. I suppose that's the
attraction of grid tie systems; you can dump as much power
as you have into the grid.
I suppose that on a stand alone system, I could just switch in
another battery.
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>> Perhaps the extra heat generated in the panels may melt the snow off or
>> dry
>> the rain? They may have been smarter than we give them credit for.
> Those two conditions would act as self limiting features, eliminating
> the need for shorting entirely. Shadow is mother nature's voltage
> regulator.
> mike