Battery Replacement; Select Load Appropriately / Sizing A Ups; Select Application Voltage / High Volt Vs Low Volt (120V Or 208V) - HP 204451-002 - UPS T2200 XR Best Practices Manual

Battery Replacement

It is best practice to replace the batteries every three years to ensure that the load will be properly
supported during power outages, especially during high load conditions.
There are a number of conditions that affect battery life, including temperature and the depth and
frequency of battery discharges. The "shelf life" of batteries decreases with increased ambient
temperature. This is particularly important if the UPS is to be stored without periodically recharging the
batteries. For example, at a 40ºC (104ºF) ambient, battery life is reduced approximately 70 percent from
what would be expected at 25ºC (77ºF). Even when the UPS is in use and the batteries are fully charged,
higher ambient conditions will reduce "float" service life. Battery life is also affected by depth and
frequency of discharges.
This symbol indicates that you should not discard the UPS or the UPS batteries in the trash. The
UPS may contain sealed, lead-acid batteries. Batteries must be recycled. For proper disposal,
contact your local recycling/reuse or hazardous waste center.

Select Load Appropriately / Sizing A UPS

For configurations involving multiple servers and/or additional critical storage/option products, simply add
up the total watts of the equipment that will be plugged into the UPS and select the UPS model with a
watt rating higher than the equipment load. To allow for future system growth and for power on inrush
current, a good rule of thumb is that the computer load should be about 60 to 80 percent of the UPS watt
capacity. Power supplies have the ability to support a high-wattage rating in a high-line (200V - 250V)
environment versus a low-line environment (100V - 120V).
To facilitate the sizing of a UPS HP has provided a sizing tool that can be accessed at:
www,upssizer.com

Select Application Voltage / High volt VS Low Volt (120V or 208V)

In America one can choose a low voltage system or high voltage system. Low voltage ranges from 100V-
120V, commonly known as 120V. High voltage ranges from 200V-240V.
Most servers have an auto-sensing feature that allows the device to automatically adjust to voltage levels
ranging from 100V-240V. Therefore, most servers can be powered from low voltage or high voltage
system.
A high volt system is inherently more efficient in that less current is used, and can help save the
datacenter money. Consider an R3000 UPS which is available as both high volt and low volt. Current =
Watts / Voltage. The current for an R3000 at 120V = 22.5 amps; at 220V = 12.27 amps. From this
example, the current carrying capability for the wire on the low volt (120V) R3000 must be selected to
carry nearly twice the current...bigger wire...bigger breaker...all costing more money in equipment like
additional Power Distribution Units (PDUs) and subsequently additional cooling for the datacenter.
In sizing a datacenter, one must determine how much power the equipment requires, and how much
power is available in the existing room. It is important to note that for safety reasons, one should not use
more than 80 percent of available power in the data center in order to keep breakers from tripping and
outlets from overloading.
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