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Calculating Amp Draw of Components

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algaeguy

Member
Joined
Nov 30, 2004
Messages
18
Location
Los Angeles
Hi everyone:

I'm in the process of assembling my new system (well- assembling the gear, at this point!), and I was curious how you calculate how many amps your equipment is consuming.

In other words, how do you convert watts into amps? Is there a common formula?

Any electrical brains would be appreciated!

Scott :)
 

Llarian

Well-known member
Joined
Feb 25, 2004
Messages
556
Location
Seattle, WA
Amps = Watts / Voltage

E.G. a 250W Metal Halide will use around 2.3A

Figure a little higher for ballast inefficiency though. Also, leave overhead for spiking. You never want to fully utilize a power leg, or fluctuations will pop your breaker all the time.

-Dylan
 

highlands

Member
Joined
Apr 9, 2005
Messages
20
Location
Mountains of Vermont
I bought a little device called a KiloWatt that you plug in between your equipment to be measured and the wall power. It gives very nice readings over time of actual power consumption. Radio Shack, among others, has it. I believe the cost was $30 or so. Well worth it. Move it around and discover where all your power is going.
 

Scooterman

Administrator
Joined
Oct 30, 2003
Messages
10,943
Location
Louisiana
I need to get something like that so I can total up my amperage, I hate getting close to the limits of a breaker, when I move my tank, I'll add two circuits dedicated just for it so I can sleep better at night, I'll probably build a panel or something of the sorts and enclose all of the wiring in a water tight Nema 12x fiberglass box.

 
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