Originally Posted by MadViking
You only want to go to 5500 watts on a 240 volt, 30 amp circuit. 7000 watts takes the circuit to the max it can hold before tripping.
240 volts x 30 amps = 7200 watts. That is max load. Multiply that by .80 to get a working load, 7200 watts x .80 = 5760 watts.
Exactly right. Thanks for posting this... you saved me some typing.
Also, 240 volts is a very optimistic number for voltage into a house. Usually the power coming in is about 210-215 volts.
That's *really* low. If you're only getting 105-107.5VAC from your regular outlets, I'd talk to the power company. You should only see sags that low *maybe* during the hottest parts of the summer when A/C units everywhere are running.
The lowest I've on my 240V into the control panel is low 230's.
For example, here it says 236V:
The element is off here. If it's on the voltage drops an extra 2-3 volts.
Looking at some of my other pics I see a few with 239V. One even with 244V!
FYI - In the end it should really matter. It'll just take slightly longer to heat up the water if it's under 240V.