Inquiry about watt

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  #1  
Old 03-29-14, 07:43 AM
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Inquiry about watt

Hi

I have an office fan with 3 speeds, the writes at the fan says it's ( 90 watt )

dose it's consumes 90 watt when it's working at the lowest speed or the highest speed ?
 
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Old 03-29-14, 08:43 AM
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Welcome to the forums.

Highest speed for sure but probably all three. The make and model of your fan, and a picture of the name plate, might help us give you more accurate information. See How To Include Pictures.
 
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Old 03-29-14, 08:58 AM
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Thanks a lot Nashkat1

Is it a rule ? I mean any writes about watt is always the max ? even if it was a fan, air condition, P.C .... ?
my air condition is 1250 watt, so it can't consumes more than 1250 watt at any way (Except while starting up) ?
 
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Old 03-29-14, 09:20 AM
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Do you have a specific reason for the question or are you just seeking knowledge?
 
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Old 03-29-14, 09:30 AM
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In my city there are crisis in power, so I am going to buy power inverter and car battery.

So I wanted to calculate the max watts my stuff will use.
 
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Old 03-29-14, 10:27 AM
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In my city there are crisis in power, so I am going to buy power inverter and car battery.
Most car batteries won't run a 90W AC load for very long. How are you planning to keep the battery charged?

Where do you live? I'm not aware of any cities in Alabama that experience frequent power outages.
 
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Old 03-29-14, 10:33 AM
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It's Cairo, Alabama, Egypt. Just across Lake Eufala....by 6000 miles.
 
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Old 03-29-14, 10:48 AM
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It's Cairo, Alabama, Egypt. Just across Lake Eufala....by 6000 miles.
Uh huh. Thought so. 220V hot-to-neutral at 50Hz.

I'm not familiar with that power. I doubt that many of us here are.

mahamad, go with the first answer: figure your fan will always use 90W.
 
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Old 03-29-14, 10:52 AM
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Old 03-29-14, 11:10 AM
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Yes I live in Cairo, Egypt

I will charge the batteries with a charger. 55 ampere battery runs 200 watts for 3 hours approximately


the power outages around 1 hour and in summer it would be more, that's effect my work.

By the way, the electric here is 220 Volt, not 120
 
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Old 03-29-14, 11:23 AM
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Would suggest the 12 volt fans as I previously wrote. Converters are not 100% efficient so some waste with a converter. Also consider 12 volt fluorescent or LED lights.
 
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Old 03-30-14, 10:45 AM
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Thanks a lot for your help.

But I am going to connect P.C as well or a Laptop to the car battery when power outages, and I think there are no power supply or laptop charger work with 12 Volt, I will need the inverter at any way I think
 
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Old 03-30-14, 11:01 AM
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They make 12 volt chargers for laptops.
 
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Old 03-30-14, 11:35 PM
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A car battery will not last long they are not designed for deep cycling you need a traction battery like used for golf trolleys or mobility scooters or a half way battery called a leisure battery.

Inverters also come in two types true sine wave and simulated sine wave with most lap tops the simulated sine wave is good enough, but some motors may not like simulated sine.

There are inverter chargers made which make your set up into a UPS (Uninterrupted Power Supply) but to recharge in a short time the charger needs to be a step or pulse charger in the main step chargers are used where the battery is not being used while being charged and pulse chargers where the battery is being used at same time as charging like with solar panels or wind charger.

90W will refer to power at full speed once running it may well exceed this figure on start up. Depends on motor type.
 
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