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Re: Conditioners' efficiency

James Sweet wrote:
> Breakers do not trip instantly.
>
> The spec you're looking for is LRA, Locked Rotor Amps. A typical 3 ton
> residential AC unit may draw 12A operating, but the LRA can be over 100A.

Thanks to all of you, also to Michael replying on the other sub-thread:
I think I understand the whole problem now!

Now, this problem is going to be really nasty for us because due to some
policies of the building that hosts us, it seems that we cannot bring
two separate power lines to our server room.

In addition, I think we cannot afford an UPS so big to protect all the
equipment. We accept to have the equipment go down if there is a
blackout (this is a computation cluster, we don't need 24/7 guaranteed
availability), however we would like to protect the equipment from the
damage that can be caused by the frequent brown-outs from the A/C. Is
there anything we can do that comes to your mind?

Two ideas come to my mind but I am not sure of the feasibility: would
you please comment?

1 - We could use a current limiter before the A/C. Does it exist? What's
the technical name? We need one that can be put before a 50,000 BTU air
conditioner (probably three-phase).

2 - We could use a buck-boost voltage stabilizer before the computers.
For high powers I think this costs 1/10 of what an UPS costs (we need
around 15000 KVA).

Thank you

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