Is it reasonable for a solar car battery charger…
Is it reasonable for an avg solar powered (30cm x 10cm) car battery charger to have an output of 661W over the span of 1 day?
Its the answer I got for my assignment and I’m not sure whether that is correct.
when i use my multimeter the solar panel outputs 22V dc and at best 100mA
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2 Responses to “Is it reasonable for a solar car battery charger…”
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watts is already a rate of energy per unit time, so “watts over 1 day” doesn’t mean a lot.
Unless you mean an average power level of 660 watts during the course of one day?
typical solar arrays will supply about 10-12 watts per sq ft, or about 10 mW per square cm. You have 300 sq cm, so that is about 3 watts max.
Your measurements agree with that, 22 volts at 0.1 amp is 2.2 watts.
now perhaps you want watt-hour, a unit of energy.
3 watts over a 12 hour summer day is 36 watt-hours, still not 600
.
In reality it totally depends on the output of your solar panel. It must be cleaned weekly. 6.61 watts per hour for 10 hours of sunlight equals 661 watts. Another terminology for your quantity is nearly 2/3 of a kilowatt hour per day. However when I do the math here is what I get.
100mA divided by 1000 to get 0.1 amp multiplied by 22 volts = 2.2 watts (E X I = Watts) or 22 watthours per day.
Good luck