1. Do you have any information on UPS battery maintenance and storage? Can the UPS battery be replaced?
Yes, all Acumentrics UPS units have user-replaceable batteries. If you require a new battery pack, please email the UPS (uninterruptible power supply) model number and your request to firstname.lastname@example.org . A quote will be sent to you for the appropriate battery pack.
If you would just like the battery cells replaced, please email the UPS model number and the serial number of the battery pack to: email@example.com ; request a return authorization number and the cost for the repair.
For battery maintenance and storage information, please read the following:
For the ACG2500 Series UPS:
Maintenance and Battery Storage
The proper storage of UPS batteries cannot be overemphasized. Improper battery storage is the most common form of battery misuse. All batteries exhibit a loss of charge over time even when stored in an open circuit condition. This is called self-discharge. Both chemical and electrochemical reactions within the battery cause this consumption of the stored energy. The self-discharge reaction rate increases as a function of temperature. If the batteries are stored long enough without a periodic replenishment of charge, an irreversible loss of battery capacity can occur, causing premature battery failure.
All Acumentrics battery packs are shipped fully charged. They should be stored separately from the uninterruptible power supply and used on a FIFO (First In, First Out) basis. All battery packs should be recharged before use of the UPS (uninterruptible power supply) if 100% capacity is required. The stored battery packs should be kept on a maintenance program and should be recharged periodically according to the recommendations shown in table 1. Battery packs can be recharged using the UPS (uninterruptible power supply).
Table 1: Storage Temperature and Supplementary Recharge Intervals
The battery OCV (Open Circuit Voltage) can be used as an indicator of battery pack residual capacity. When measuring the OCV, the battery pack should not have been charged or discharged within the past 24 hours. A supplemental recharge should be performed if the battery pack OCV is 24.6 volts or less when measured at 25ºC (77ºF).
The ACG26BP has a recharge time of 2-hours to 90% present capacity from full discharge. The ACG2500BP has a 4-hour recharge time to 90% present capacity from full discharge.
Charging the UPS Battery
The UPS (uninterruptible power supply) charges its battery when connected to utility power. For best results, charge the battery 4-hours before use of the UPS. It is acceptable to use the UPS (uninterruptible power supply) without first charging the battery, but battery run time may be shorter until the battery fully charges
The UPS is continually creating the AC output from a high voltage DC bus, thus protecting your equipment from surges, spikes, brownouts, blackouts and noise.
This unit is an on-line Power Factor Corrected (PFC), Uninterruptible Power Supply (UPS). This UPS accepts wide range voltage and frequency inputs to allow it to provide clean, reliable AC power to the equipment it supports.
Ensure the unit is clean with no fluid spills. Do not store anything on the unit.
The 2000 Watt Rugged-UPS™ product and its accessories are chemically resistant to most common cleaning solutions and non-caustic detergents. The following list includes approved cleaning solutions:
Acumentrics recommends cleaning the UPS unit and cables with a soft damp cloth, and cleaning agents mentioned.
Do NOT immerse any part of the UPS unit in water. Do not use ketones (MEK, acetone, etc). Avoid using abrasives (e.g., paper towels) on the UPS.
For the ACG1250 Series UPS:
Storage and Maintenance of UPS Battery Packs
|Storage Temperature||Recharge Interval|
|Below 20ºC (68ºF)||Every six months|
|Between 20ºC and 30ºC (68ºF and 86ºF)||Every three months|
|Over 30ºC (86ºF)||Storage to be avoided|
The battery OCV (Open Circuit Voltage) can be used as an indicator of battery pack residual capacity. When measuring the OCV, the UPS battery pack should not have been charged or discharged within the past 24 hours. A supplemental recharge should be performed if the UPS battery pack OCV is 24.6 volts or less when measured at 25°C (77°F). If the open circuit UPS (uninterruptible power supply) battery pack voltage measures below 23.16 VDC, then permanent battery damage has occurred and the UPS battery pack must be replaced.
The recommended frequency for testing the UPS Battery Packs is once every 30 days.
The UPS (uninterruptible power supply) battery pack test is performed at ambient room temperature by first measuring the open circuit battery voltage. If the battery voltage measures less than 24.0 VDC, then the battery pack should be replaced. If the battery voltage measures greater than 24.0 VDC, then connect the UPS to a valid AC input (115/230 VAC, 50/60 Hz) source and operate the UPS (uninterruptible power supply) for 24 hours. The UPS should then be powered off and unplugged from the AC source. Remove the battery pack from the UPS. After 24 hours, measure the battery voltage at the pins located at the rear of the battery pack. Table 2, “Battery State of Charge”, defines the condition of the battery having been fully charged by the UPS (uninterruptible power supply). If after 48 hours, the Open Circuit Voltage of the battery is less than 25.7 VDC, then the UPS battery should be replaced.
The battery voltage can also be measured from the comm port when the unit is fully off, provided the comm port is accessible. The comm port is an RS232 compatible interface through a nine-pin D type connector (refer to pin description in question 3). This port provides UPS (uninterruptible power supply) and input power status information to the operator.
Table 2: Battery State of Charge
|Open Circuit Voltage||State of Charge||Run Time @1000W Load|
|25.7 VDC||100%||> 10 Minutes|
|25.0 VDC||75%||> 7.5 Minutes|
|24.4 VDC||50%||> 5.0 Minutes|
|23.7 VDC||25%||> 2.5 Minutes|
Specific Information By Model
|Front Display ACG1250U, ACG1250Ui, ACG1250U-SH||Front Display ACG1250U-24, ACG1250Ui24, ACG1250-24-SH|
(Click Image to Enlarge)
(Click Image to Enlarge)
UPS Run Time Chart:
|Load (watts)||Typical Minutes of Runtime by UPS|
|ON/OFF||Powers the UPS as well as turns on\off the audible alarm|
|AC Input Breaker||Trips when the loads exceed the UPS’s capacity|
LED Display Panel:
|Battery Status Meter||Displays the present battery charge in volts DC (Range 20 -28 VAC)|
|Load Meter||Displays the power being drawn by the loads (Range 0 - 1000 watts)|
|Overload||This LED lights when the loads connected to the UPS exceed the UPS’s capacity|
|On Internal DC||The UPS is supplying power to the loads for the internal batteries|
|Over Temperature||This LED lights when the UPS internal operating temperature has exceeded specifications|
|On AC||The UPS is supplying power to the loads for the AC connection source|
|On External DC||The UPS is supplying power to the loads from the external DC connection source|
|Replace Battery||This LED lights when the battery has reached the end of its usable life|
UPS Batteries and Recycling
The batteries used by this Uninterruptible Power Supply (UPS) are recyclable. Proper disposal of UPS batteries is required. UPS batteries contain lead and pose a hazard to the environment and health if not disposed of properly. Please refer to local codes for proper disposal requirements or return the UPS to a factory-authorized Service Center for battery replacement or disposal.
UPS battery replacement should be performed or supervised by personnel familiar with the danger of batteries and the required precautions. Keep unauthorized personnel away from UPS batteries. When replacing UPS batteries, use the same number and type of sealed lead acid batteries as were originally contained in your UPS (uninterruptible power supply).
Caution - Do not dispose of UPS batteries in fire. The batteries may explode.
Caution - Do not open or mutilate the UPS battery or batteries. They contain an electrolyte that is toxic and harmful to the skin.
Caution - A UPS battery can present a risk of electrical shock and high short circuit current. When replacing UPS batteries, wrist watches and jewelry such as rings should be removed. Use tools with insulated handles.
Acumentrics' UPS systems have two modes of communication, simple signal and smart. The former uses dry contact closures and the latter is true RS-232 communication.
Acumentrics communications cable part number: ACG9236 allows users to utilize the built in UPS monitoring functionality of Windows' operating systems (NOTE: on notebook computers this is not accessible). This Windows UPS monitoring uses our simple signal mode to provide the user notification that AC power has been lost or restored and low battery alerts. RS-232 uses cable part number: ACG9270.
5. Can Acumentrics' new Lithium Ion battery packs replace the original Lead acid battery packs used in my system?
Yes, Acumentrics' Lithium Ion battery packs are backwards compatible with fielded units.
Parallel UPS Operation:
Parallel UPS (uninterruptible power supplies) work in a master/slave configuration. All parallel UPS units are identical. The master is determined by the use of the master parallel cable
The master UPS controls the voltage output and the slaves act as current sources. The master UPS supplies the slaves with the command current signal.
The feedback paths in the parallel UPS units are opened internally and closed when properly cabled. If a parallel UPS (uninterruptible power supply) does not have a properly attached parallel connector, it will have an open feedback loop and not be able to react in time to the fault.
The AC Output of each parallel UPS must be hardwired together (no circuit breakers, switches, etc.) to a junction box. After the junction, there can be a switch or circuit breaker.
The shipping material for the UPS (uninterruptible power supply) is designed to provide the necessary protection during shipping. These materials must be used if you ever need to return the UPS for service. Damage sustained during transit is not covered under UPS warranty.
Acumentrics UPS repair facility is located at our factory in Westwood, Massachusetts.
In-Warranty UPS are repaired or replaced at Acumentrics discretion. Please call 781-461-8251 x500 or email firstname.lastname@example.org to request a return authorization (RMA) number. Have the serial number and the model number of the UPS unit available at the time of the call.
Out-of-warranty UPS can be evaluated for potential repair cost for a fee of $250.00. Once the UPS is received and evaluated, a report will be sent detailing the items in need of repair or replacement. If you choose to have the UPS (uninterruptible power supply) repaired, the evaluation fee will be waived. If you choose not to repair the UPS, the evaluation fee will apply. Once the evaluation payment is received, the UPS unit can either be scrapped at the Acumentrics facility or returned to you for disposal. Please call 781-461-8251 x500 or email email@example.com to request a return authorization (RMA) number. Have the serial number and the model number of the UPS unit available at the time of the call. Repair will commence upon receipt of either credit card information or an approved NET30 purchase order.
All freight charges are collect or prepaid/add. Exception to this policy requires pre-authorization by a member of Acumentrics management.
Please send an email to firstname.lastname@example.org or call 781-461-8251 x328 or x350 to request a quote. When emailing, please provide your name, company name and address, e-mail address, and telephone number. If you know the model number of the UPS (uninterruptible power supplies) you are interested in, please provide that as well. If you are unsure, please provide as much information as possible about the size of the load, the power requirements, and the back-up time you require from the UPS. Mention any special requirements such as DC Input, 24 or 28vDC output, the voltage required on the AC output (120V/60Hz, 220V/50Hz), or Extended Run or Parallel Capability. A quote will be sent to you on the same day if received by 3 p.m. EST/EDT Monday through Friday.
You may also try our Rugged-UPS™ Configuration Tool. Once your information is received, a member of our team will follow-up with you to complete the UPS order.
Below are links to the Material Safety Data Sheets (MSDS) for our battery products:
- MSDS – Lead Acid Battery (B.B. Battery) (57 KB)
- MSDS – Lead Acid Battery (CSB Battery) (1.2 MB)
- MSDS – Lithium Ion Battery (K2 Energy) (102 KB)
To learn more about Acumentrics UPS products, contact us today.