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New question instead of need 300kWh

Discussion in 'Photovoltaics' started by Tim Thomson, Jul 8, 2005.

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  1. Tim Thomson

    Tim Thomson Guest

    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
    later.

    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.
     
  2. wmbjk

    wmbjk Guest

    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
    http://www.rebelwolf.com/essn.html

    Wayne
     
  3. George Ghio

    George Ghio Guest

    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
     
  4. Ron, please accept my sincere apologies for mis-reading your post, and
    for the shameful innuendo in my response. It won't happen again.

    (alternate reality) George Ghio
     
  5. Tim Thomson

    Tim Thomson Guest

    Does this include having the panels follow the sun or fixed mounts?
     
  6. George Ghio

    George Ghio Guest


    Well Ron, you in fact said;

    '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.



    So first you say Tim misunderstood the "peek" thing and then go on to
    explain "Effective Sun Hours" when Tim said quite plainly;

    "Another question is this peek thing.............I just don't see a two
    hour of peak here I think its a little longer.......I am talking sunny
    *day* in july..... I don't care about clouds and averageing the year."


    Hence my post,

    "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"

    Which is the correct answer for Tim's question about the "Peek" thing.

    Sorry you don't like it but correct is correct. So why rabbit on about
    ESH when the question was PSH.
     
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