Uglysquirrel wrote:Your wattage use on each component of your stoker line is WRONG. Its way tooo high and gives the impression you need 600 watts to run one of these while in actuality it consumes ^150 or a bit more (even the Pocono with 2-convection fans) ! It would scare me away a bit if my stove consumed 9-10 cents a hr (600 watts) as in some states where the cost is 16-18 cents/kwh, it could give the impression running the stove will cost 2.40 a day or 70 bucks a month. Give real test results with 30 %, 60% and 100 % fan. In actuality I think most do not run over 60-70 % convection fan.
Typical wattage is very difficult to estimate but I agree it is stated way to high. The actual wattage (real power) is almost always far less than the a fan's label., it decreases the less air is actually moved. As strange as it seems, put your hand over a vacuum cleaner hose to plug it and it draws LESS power than when it is actually moving air. That is why it speeds up, it's not doing as much work!
It is important to note wattage can't be measured with volt and amp meters. That only gives a VA rating, not actually power consumed. The electric meter on your house reads REAL power, Volts times Amps includes "imaginary" power.
This is related to the generator discussions. Motors don't draw current in phase with voltage. A motor actually acts like a generator at some points in it's rotation returning SOME power to the supply. Power meters actually can run backwards, although not in this case, they will just read lower than one would calculate by measuring RMS Voltage and Amperage and multiplying the two. Many inverter generators don't cope with imaginary power well or current spikes if the motor has an electronic speed control.Complicated enough yet?
Unless the power source is very strange, an undamaged fan will always draw less power than the nameplate indicates. The less air they move the less power they draw even if they are partly obstructed and spin faster.
Real fans in use are always partially obstructed.! True power meters account for imaginary power.
Stating accurate power in a spec is very hard to do. The fan will always have less flow than what the fan manufacturer would test in free air and any fire box draft for combustion fans or natural convection flow for those fans will unload them. Chances are, the nameplate power or VA was calculated just by putting a max rated load on the motor only, no fan attached.
A minor consolation is that all REAL power drawn by a motor (as measured by your electric company's meter) always ends up as heat. So it isn't wasted, just more expensive heat than from burning the coal.