General discussion


Power requirements for a small network?

By Johndoe123004 ·
How do I calculate the power requirements for a network with 10 clients in an office? What should be my concerns (ex. loss of server/client power and data loss? Are there any concerns outside of the Windows environment that I need to be aware of? What are they and how do I address them?

This conversation is currently closed to new comments.

Thread display: Collapse - | Expand +

All Comments

Collapse -

by BFilmFan In reply to Power requirements for a ...

Call the local utility and see if they offer a power analysis. Some of them do it for free.

You need to calculate the total draw of all your computer equipment, such as PC's, monitors, hard disk storage arrays, tape backup, laster printers and network hubs and switches (you'd be amazed at the number of people that forget to include these in designs). There is a difference between peak current draw and average amperage utilization.

Does this plan just cover power or is it part of a larger disaster recovery plan?

FEMA and ITIL both cover disaster recovery planning in detail.

Collapse -

by house In reply to Power requirements for a ...

To add to BFilmFan's answer, it is the general rule of thumb for standard Uninteruptable Power Supplies (if you plan on using them) to be...

Total x 1.25 = minimum UPS rating

Keep in mind too that if you are using a laser printer, it should be alone, as the initial draw that takes place can cause a significant "undervoltage" to the other devices.

A good UPS can be setup so that it can properly shut down your computers. This will put your mind at ease regarding data loss and corruption due to power outages. You should be aware though that, when is constant use, the batteries tend to lose their potential. Most UPS units will allow you to view the "time before failure". Make sure that your server(s) has enough time to respond and shut down properly by giving it a dry run.

If you want to go crazy, you could invest in a line conditioner. This device will allow you to maintain a stable frequency and current at your location. They cost mega $$$ though, and may not be practical for a 10 client network.

Collapse -

by house In reply to

I'm talking about a line conditioner for his main power supply. These are far from cheap.

Collapse -

by house In reply to

25% head-room is the industry standard. I've never heard of the 10% standard that is quoted elsewhere.

Collapse -

by pgm554 In reply to Power requirements for a ...

This sounds a bit like a homework question.
But in any case, never install or sell a client / server network without a battery UPS on the server itself. The workstations can get by with surge suppressors.
As for line conditioning, most modern UPS?s have line conditioning built in (i.e. APC Smart and Back series)


As for line conditioners:

Line conditioners are actually cheaper than UPS?s.

Rule of thumb is to allow for 10% headroom on the battery backup or line conditioner.

To figure out amps required for a UPS or line conditioner, (they are measured in volt amps) and lets say your server and monitor pull 5 amps.
You would then multiply 5 x 120v (USA) to give you volt amps.
So you would need a UPS that would deliver 600 VA + 10% or 660 VA.
So an APC 720 would be a choice.

I am a certified APC dealer and kind of know these things.

Collapse -

by wlbowers In reply to Power requirements for a ...

You are either a student or your boss gave you something to do outside your abilities.

Think about the problem. What happens to a running computer when you take the power plug and rapidly unplug and plug it in 6 or 7 times.

Not a pretty thought huh. Now what can you provide to prevent this from happening.

Do you think the above link was a hint?

Now think what would happen if the data becomes corrupted. How can you prevent that.

Not gonna give you a hint for this one.

Good Luck Lee

Related Discussions

Related Forums