Detrick Combined Battery PM Reports.pdf
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- Solicitation number
- W91RUS26QA027
About this file
This is a maintenance inspection report for uninterruptible power supply (UPS) battery systems at Fort Detrick, Building #1650 in Frederick, Maryland, dated July 29, 2024. The inspection covered two identical 80-kilowatt Powerware 93PM-100-3 UPS units (UPS-A and UPS-B) with Eaton PWHR12390W4FR battery modules manufactured in January 2020. Each system consists of 36 battery cells configured in series with a 460-volt direct current string voltage and 300-ampere disconnect capacity using 2 American Wire Gauge cables. At the time of inspection, UPS-A carried no load while UPS-B operated at 16.1% capacity (9.7 kilovolt-amperes / 8.3 kilowatts), with both systems reporting zero alarms and ambient temperatures at 71 degrees Fahrenheit.
The inspection findings indicate that the majority of battery cells in both strings exhibit slightly low voltages, while all other electrical readings—including AC ripple, positive and negative ground voltages, DC and AC currents, and internal resistance values—remain within acceptable tolerances. For UPS-A, individual cell voltages ranged from 12.725 to 12.838 volts with an average of 12.778 volts, while UPS-B cells ranged from 12.725 to 12.864 volts with an average of 12.790 volts. Internal resistance measurements across both systems averaged approximately 4,900 to 5,000 ohms. The inspection report recommends continued monitoring of both battery strings for any significant voltage changes rather than immediate replacement, as the systems remain operationally sound.
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Fort Detrick Building #1650 Frederick, MD 21702 Re: UPS Batteries
On July 29, 2024 we performed a maintenance inspection on (2) strings of UPS batteries. The following is our report with our findings and recommendations:
Location Bldg #1650 (UPS Room) Equipment UPS-A UPS-B Manufacturer Powerware Powerware Model 93PM-100-3 (80KVA) 93PM-100-3 (80KVA) Serial # EP175UXX04 EP175UXX03 Load (UPS) 0% / 0KVA / 0KW 16.1% / 9.7KVA / 8.3KW Alarms None None Batteries UPS-A UPS-B Manufacturer Eaton Eaton Model PWHR12390W4FR PWHR12390W4FR Date Code 01 / 2020 01 / 2020 # Of Units 36 36 Overall Voltage 460.4VDC 460.5VDC AC Ripple 5.7mvAC 6.6mvAC Pos-Grd 231.1VDC 232.0VDC Neg-Grd 229.3VDC 228.4VDC
I DC <.1A <.1A
I AC <.1A <.1A
Ambient Temp 71F 71F Neg Post Temp 71F-72F 71F-72F Disconnect 300A 300A Cables (2) 2 awg (2) 2 awg
Results & Recommendations:
UPS-A-String-#1- Upon inspection majority of batteries have slightly low voltages, all other readings were within tolerance. We recommend monitoring batteries for any significant changes.
UPS-B-String-#1- Upon inspection majority of batteries have slightly low voltages, all other readings were within tolerance. We recommend monitoring batteries for any significant changes.
Upon review, if you have any questions or if we can be of further assistance, please contact us.
Thank you, Jeffrey M. Owens
Date Code: 01 / 2020 Location Name: Bldg #1650
UPS: Powerware 93PM-100-3 String Name: UPS-A
Model Number: Eaton PWHR12390W4FR
Readings taken on Cell/Jar Voltage Internal Res.
07/29/2024 O.V. = 460.0
1 12.749 4924 2 12.773 4870 3 12.764 5053 4 12.759 4922 5 12.728 5072 6 12.773 4871 7 12.775 4813 8 12.796 4944 9 12.793 4865
10 12.764 4882 11 12.779 5005 12 12.779 4919 13 12.790 4853 14 12.756 4816 15 12.762 4751 16 12.781 4818 17 12.788 4987 18 12.751 5162 19 12.804 5068 20 12.792 5221 21 12.838 4746 22 12.786 4867 23 12.829 4752 24 12.829 4934 25 12.829 4823 26 12.838 4818 27 12.837 4919 28 12.823 4813 29 12.728 5041 30 12.725 5022 31 12.728 5035 32 12.747 5035 33 12.736 5247 34 12.778 4919 35 12.742 5242 36 12.768 4784
Summary: High
Avg
Low
12.838 5247
12.778 4939
12.725 4746
1Page
Location Name: Bldg #1650
UPS: Powerware 93PM-100-3 String Name: UPS-A Model Number: Eaton PWHR12390W4FR
2Page
Location Name: Bldg #1650
UPS: Powerware 93PM-100-3 String Name: UPS-B
Model Number: Eaton PWHR12390W4FR
Readings taken on Cell/Jar Voltage Internal Res.
07/29/2024 O.V. = 460.4
1 12.737 5069 2 12.757 5032 3 12.765 5285 4 12.769 5186 5 12.805 5103 6 12.795 5090 7 12.779 5013 8 12.789 4872 9 12.749 4890
10 12.811 4972 11 12.794 4843 12 12.739 5020 13 12.806 5148 14 12.794 4979 15 12.804 5090 16 12.736 5162 17 12.802 4928 18 12.799 5266 19 12.800 5228 20 12.788 5080 21 12.810 4932 22 12.794 4939 23 12.802 5175 24 12.725 4879 25 12.805 4993 26 12.796 5007 27 12.787 5074 28 12.809 4897 29 12.771 5140 30 12.809 4828 31 12.770 4962 32 12.816 4734 33 12.794 4724 34 12.810 4883 35 12.851 5072 36 12.864 5145
Summary: High
Avg
Low
12.864 5285
12.790 5018
12.725 4724
1Page
Location Name: Bldg #1650
UPS: Powerware 93PM-100-3 String Name: UPS-B Model Number: Eaton PWHR12390W4FR
2Page
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