I'm attempting to register the energy star equipment for my project under Table EAp2-4. The table asks for Rated Power in WATTS. Every spec I have found for the refrigerator, washer and dryer list the power in kWa. I found a calculator from kWa to W online, but it asks to divide by number of hours.
Has anyone come across this conversion? Should I divide by hours in a day, hours in a year, etc?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
May 20, 2015 - 9:36 am
I have not seen kWa but it sounds like kW (1000 watts).
If it said kWh then dividing by the hours makes sense since kW times hours of use = kWh.
Sarah Simchuk
May 20, 2015 - 1:46 pm
I misspoke, I meant that most of the energy is being quoted in annual kWh, not kWa. Knowing that this is an annual calculation of kW (1000 watts), is there a recommended conversion to take this to rated Watts as required by LEED. None of the specifications i've looked at have communicated the power in Watts.
Gaston Michaud
Mechanical EngineerENEX
14 thumbs up
May 20, 2015 - 1:58 pm
You should be able to get the current in amps from the spec sheet, and then you multiply it by the local voltage and you get watts.
In other cases, I have assumed that the refrigerator compressor is on somewhere between 5-6 hours per day, and used that to estimate the rated power based on the annual kW-h.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
May 20, 2015 - 2:14 pm
If you have kWh that should be for a period of time. You then need the hours of use (run time) to get the watts. The kWh ratings are determined using a set quantity of run time so you might need to find out the testing protocol they used to determine the kWh and work backward. However, you should be able to determine the watts as Gaston has indicated.