In short no. 20 of them maybe. The average water heaters electrical element is 800-1200 Watts and they usually have 2. If you have an electric water heater read the spec sticker on the side and it should tell you the electrical specs are, probably 220v 5-6amp or more so at 5 amp you'd be looking at 220x5=1100watts, at 6 amps; 220x6=1320watts. Just do the math and figure it out.
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You can size your solar array in just two easy steps! (Well, okay, there's a little research involved, too.) To estimate the size of your solar array, you'll need to know: # The number of Watt-hours (Wh) you plan to produce in one day. # The insolation value at your location. I have found this website to offer the easiest way to find out How Many Solar Panels do you need in your Solar Array?http://howto.altestore.com/Library-Articles/Solar-Electric-Power-or-PV-Systems/How-Many-Solar-Panels-do-you-need-in-your-Solar-Array/a88/
5000w/190w=26.316 so connect atleast 27 solar panels.
#6 wire is needed. If placing the subpanel in a garage at a good distance, it is recommended to also install a seperate ground rod .
MW is a unit of power just like kW 1MW = 1000 kW 1 mega-watt = 1000 kilo-watt Watt is a measurement of power. watt-hour is a unit of energy 1 mega-watt-hour = 1000 kilo-watt-hour
It will power two 400 watt lamps.