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Old 12-22-2012, 08:57 AM   #11
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No it wouldn't need to be the same size. Just a "12"volt panel. You can't mix different nominally rated panels, ie 12v or 24v.

And yes that pwm controller would have to be replaced.
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Old 12-22-2012, 10:25 AM   #12
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Once you bought a second PV module, you should re-wire them in series and use an MPPT controller to obtain maximum performance increase.

Glenn
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Old 12-22-2012, 11:59 AM   #13
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series is best for A stationary installation in which both panels are exposed to the same amount of light, as on a home.

But a camper may have one panel full Sun, the other part/full shade. If wired in series, the shaded panel would pull down the output from the full Sun panel. In parallel connected panels the shaded panel does not hinder the power of the other panel.
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