A little Googling shows that solar panels tend to come in standard physical sizes.
39 x 77 = 300 watts
39 x 65 = 250 watts
39 x 48 = ?
This last doesn't appear to be a standard size, but scaling down from the others suggests that it would be about 180 watts.
If you can set the panel in the sun, and measure the output voltage with a meter, that will be the next piece of info we need.
Bill
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