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I’m not familiar with your controller specs, but when mixing different panels (using one controller) the difference in wattages won’t matter but the differences in voltages can…Its may not be possible to find panels with ‘like’ voltages, but ideally try to stay within about 10% of each other and you should be fine – a small voltage drop will likely be offset by the extra output (Yea!!)…Make sure that your single controller and AWG wire gauge is adequate for the total amp load + 10% headroom.
Keep in mind that with solar, you are in a race against the Sun over ‘peak harvest’ hours lasting approx. 4-5 hrs depending on season and latitude. In my case I did mix panels on the 300w MPPT system alone (consisting of two 100w and two 50w) with a slight difference in voltages, but due to the extra wattage the net affect helps to optimize peak harvest time…This is the real goal…