Re: electronic switch
- From: Bob <bob9@xxxxxxxxxxxxxx>
- Date: Mon, 22 Oct 2007 01:05:48 -0700
On Oct 22, 1:11 am, ARNOLD_...@xxxxxxxx wrote:
Hello to everybody.
I intend to use photovoltaic cells without battery. I will heat water
when not using other appliances.
So I need a circuit that will automatically switch the power either to
water heater or to other appliances when switched "ON" Is that
possible?
Thank you for your valuable advices. Best regards. Rudy.
Start off by telling us what voltage you applicances run on,
presumably they
are AC?
An extimate of the typical output voltage of the photovoltaic array
would be usfull.
Do you have a paticular type of solar panel in mind and how many?
Personally I'd look at using a shunt regulator which dumps
current into suitable heating elements to hold the voltage from the
photovoltaic
array down to a set level. If other things draw current the shunt
regulator will
draw less.
Looking at the big picture, can your applicances cope with a widely
fluctuating
voltage when clouds pass in front of the sun?
The amount of power per square meter from solar panels is low.
Unless you have a very big roof and spend a lot of money it is not
going
to power a hairdryer.
Are you aware that the cost of purchasing and installing solar panels
will
be much higher than the value of the electricity they will produce
during their
usfull life?
Bob
.
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