nStor NexStor 4200F Series, User Manual

Page: 28 / 174

Chapter 1 - Getting Started
Battery Backup Unit
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A battery pack should also be reconditioned after 30 partial discharges. A partial
discharge is considered to be a discharge to below 85% of capacity. The need to
recondition the battery pack is maintained by the “gas-gage” and reported to the
software user interface. Based on a normal discharge rate, it takes approximately
four hours to discharge a fully charged battery, and based on the fast charge rate
it can take approximately 10 hours to complete a recondition cycle.
The following table provides general data for BBU hold-up time. Hold-up times
for the 3700 mAh BBU batteries (Sanyo HR4/3FAUC cells) are based on
measurements taken with several different DIMM modules at room temperatures.
Worst case factor hold-up times are based on battery design capacity de-rated
from temperature and life by a factor of 0.80.
BBU Battery Hold-Up Times
Memory Worst Case Typical Configuration
128 MB 211 Hrs 287 Hrs 128 MB DIMM, 64 Mbit technology: based
on 9 x 128 Mb chips 1 mA each for the 128
MB cache DIMM, and 5 x 64 Mb chips 1 mA
each for the 32 MB on-board control store.
Total 14 mA.
256 MB 129 Hrs 141 Hrs 256 MB DIMM, 256 Mbit technology: based
on 18 x 128 Mb chips 1 mA each for the 256
MB cache DIMM, and 5 x 64 Mb chips 1 mA
each for the 32 MB on-board control store.
Total 23 mA.
512 MB 72 Hrs 88 Hrs 512 MB DIMM, 256 Mbit technology: based
on 18 x 256 Mb chips 2 mA each for the 512
MB cache DIMM, and 5 x 64 Mb chips 1 mA
each for the 32 MB on-board control store.
Total 41 mA.
4200F.book Page 16 Thursday, January 23, 2003 2:47 PM