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New question instead of need 300kWh

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Posted by Tim Thomson on July 8, 2005, 10:32 pm
I want to start off small instead and run a one year test.

I just put an amp clamp across my main and tested my fridge. It draws
1.2 amps @117 volts ac (I dont know what the surge is no matter for now)
I will calculate defrost mode and ice maker later.
It runs for 15 mins every 60 mins approx. at 20 celcius room temp (not
bad eh gotta like the new ones) any ways rounding down the numbers that
is about a total run time of 6 hours every day (24h) Do I just times the
draw by the numbers to get total kWh?

Including losses what I would like to do is figure how many 15 watt pv
panels it would take to maintain a charge to run the fridge 24 hours. I
dont care about three days of no sun for now also. Lets not figure in
the batteries for now I have an unlimited *free* source for used ones
all kinds gell car truck sealed you name it.

Lets not worrie about the fridge light, start up surge etc for now. Also
lets assume three hours of peak sun for now.

Another question is this peek thing.............I just dont see a two
hour of peak here I think its a little longer.......I am talking sunny
*day* in july..... I dont care about clouds and averageing the year.

Is peak figured out for one year with or without tracking?
With tracking I can see usable sun from about 9:00 am to 4:30 pm june,
july, august.

If any thing at least I want bragging rights that I am running my fridge
off the sun. Gotta tell the neighbours something when I am sitting in
the back yard drinking a beer. I want to use the 3 times the 15 watt
panels kits for this test just because they are easy to get right now
and they will be used for camping as well.

I got the ball rolling on appealing my right to have a wind turbine
installed on property as well...........it's a gold mind here in my spot
probablly 300 days a year of usable wind here. We will get into that

I will be tying in to the compressor a grid coiled relay to remote
off/on of my inverter for now.

Remember this is a hobby...........I dont get huricanes here.

Posted by rlsusenet@NOSPAMPUHLEEZschnapp on July 8, 2005, 10:46 pm
Tim Thomson wrote:

It's not very useful to know the instantaneous draw of your fridge.
That just tells you the minimum steady-state power that your solar
solution must supply.

It tells you nothing about how much energy your refrigerator consumes.

Dude, get yourself a Kill-A-Watt.  You can easily find one for $0 or
less.  Just go to froogle.com and see.

Plug your fridge into it, and then plug it into your wall socket.  Leave
it there for a week, preferably during the warmest part of the year, or
whenever you tend to open and close the fridge most often.

Then, you can read out how much energy your fridge eats per day, worst

Then use the device on the rest of your energy consumers.  Don't
calculate.  Measure.

Posted by wmbjk on July 8, 2005, 10:47 pm
 On Fri, 08 Jul 2005 22:32:59 GMT, Tim Thomson

Get one of these http://tinyurl.com/cqap3 , which will eliminate all
the guesstimations, and give you a way to make accurate measurements
on most of the other hard-to-measure loads. Here's something you might
find useful http://www.homepower.com/files/loadcalc.pdf

There's a detailed article about wind power in this month's ESSN


Posted by Ron Rosenfeld on July 9, 2005, 1:57 am
 On Fri, 08 Jul 2005 22:32:59 GMT, Tim Thomson

You are misunderstanding the "peek thing".

The effective sun hours (ESH) or insolation is an average for some period
of time.  Usually for a month.  So it takes into account the fact that not
all of your days are cloudless.

-- ron  (off the grid in Downeast Maine)

Posted by George Ghio on July 9, 2005, 5:58 am

Ron Rosenfeld wrote:

Hate to burst your balloon here but Peak Sun Hours (PSH) is measured for
a day.

Peak Sun Hours - The equivalent number of hours at peak sun conditions
(i.e. 1 kW/m2, AM = 1.5, temperature = 25 deg.C) that produces the
same total insolation as actual sun conditions for that day.

IF you collected 3000 Wh for the day then you have 3PSH

IF you collected 5000 Wh for the day then you have 5PSH

IF you collected 1000 Wh for the day then you have 1PSH

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