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18/3/2006 at 12:36am
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Joined: 06/3/2006 Standard Member
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The output of a WG is restricted by the amount of wind. No wind, no output. Hence the need for storing power in the battery.
Your 40W SP will not give out a constant 40W of power. That is the maximum rating, which does not allow for voltage drop across cables, cloudy days, atmospheric pressure and temperature. You 40W SP is constantly supply a small amount of power to a battery. If you are using more power than the SP is providing, eventually the battery power will drop to a level of voltage that will no longer be adequate to operate 12v appliances. You get good use out of it probably because you have days or weeks not using 12v power which allows the battery to be constantly trickle charged via the SP.
The original OP was not asking for experience of them, he was asking what their good for and how do they work. I outlined the principle and mentioned the battery, as no one else did. He may have already ordered the WG without realising he needs a battery to store the power!
Without actually testing an SP or WG, i would think that over a period of say 6 months, the amount of power output from either would equate to the same, as once a leisure battery is fully charged (around 13.6v), you cannot put more charge into it.
Wiring 2 batteries in parallel would give additional APH, but would take twice as long to charge up. Depending on the power usage and the amount of time you spend using 12v power, may be detrimental to to leisure batteries, as they may never get a full charge from the SP.
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Topic: WIND GENERATOR
