You can stage 5 and 5 but you would need to add an extra heat sequencer or contactor (depending what brand of a/h you have) and have a 2 stage thermostat. Personally, I don't like staging anything under 20kw.
Don't like staging anything under 20KW?>? why would you not, with the technology of the new t-stats and the right sequencing you could have it set up so you dont have 20KW of heat blasting all at once! and watching the Meter spin around like crazy. If you have a heat pump you dont need 20KW just for defrost.
My mothers 3 ton infinity heats her 2300 sf townhouse to below 8f. I know this because the crew didn't know how to set up the controller, didn't tell me, and she called saying "the house is staying 70, but the air coming out of the registers seems kinda cold".
If what you have turns out not to be enough where you are its likely something is pretty wrong with your house. An energy audit should tell you what's wrong with your house. Adding more heat is not always the right answer. Slow the losses.
I work on them.
240 volt 5KW=20.83 amps
240 volt 10KW=41.67 amps
240 volt 15KW=62.5 amps
Of course, very few places have exactly 240 volts. And the heaters resistance will change slightly with the temp of the heater as it varies with air flow. So the amp draw will change also.
Exactly. You can't get around the physics of it. If your 10 kW strip is only pulling 20A, it is only giving you 5kW of heat unless it is being run at 480v.
The strips are normally 5kW each and more are added to get to whatever total you need.
Lower voltage will give lower amps and you take a double hit on power. As an extreme, say you connected these elements to 120v. You cut the voltage in half, the current is also cut in half, this means that the power (Power = V X I) is cut to 25% of initial value (10kW of elements would produce 2.5kW of heat).
Your memory is close for a 5 kw strip which is what most are. There is typically 4 each 5kw strips in a 20kw package. 2 of these strips are typically energized at a time. More than likely what you are measuring is the amp draw per element, which once again is typically 5kw, not the draw for both elements. It'll come to you over time. You just gotta learn to listen to the old guys. We were in your shoes at one time too!
lady parts doctor was doing the change due to complaints in the exam rooms. he didn't have any complaints for the heat