A 400 watt solar panel is about 78 inches long and 39 inches wide. It’s 1.5 to 2 inches thick. This size lets them catch more sunlight and make more electricity. These panels weigh between 50 to 60 pounds. This makes them easy to handle for most setups. [pdf]
[FAQS about 400w photovoltaic panel specifications]
In short, you can go for a 400 watts power inverter if the total wattage drawn by the appliances you intend to use is less than 400 watts. Of course, you need an inverter with a higher wattage once the total draw exceeds 400 watts. [pdf]
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