Q & A
What hardware / components come with the BQMS?
A complete system will have the following components:
- Communication Control Unit (CCU) – Processes measurement data and houses communication connections to network.
- Module(s) – Mount on the battery system in a daisy chain connection. Each module connects to 2-4 cells depending on the voltage.
- Sensing Cables – Cables which connect to the BMS clamps from the MPU for gathering measurement data.
- Clamps – Physical connection to the battery system, connects to the inter-cell connections.
- CT – Hall Effect CT clamp for measuring DC current.
Does the BQMS calculate the capacity of the batteries?
No, the BQMS does not perform a load test, so there is no way for the system to calculate the capacity. The system does detect and record all discharge events to show how each cell performed during the duration of the test.
What are the options for installation of the system(s)?
There are several options for installation:
- The customer can install the systems with free remote support from trained Eagle Eye technicians.
- The customer can select a training package for installation of the systems, either onsite training by Eagle Eye’s technicians or at Eagle Eye’s facility.
- The customer can select an installation package where Eagle Eye technicians perform the complete installation of the system(s).
Can the BQMS monitor battery systems in parallel?
No, the BQMS is designed for testing of a single system.
How does Eagle Eye’s Centroid 2 software work?
The Centroid 2 software is composed of two parts, the server and the client. Centroid 2 Server is installed on a dedicated PC that must be connected to the same network as the BQMS system(s). This software runs in the background on a Windows environment as a service. Centroid Viewer client must also be installed on a PC that is on the same network as the BQMS. The client can be installed on multiple computers and can pull data directly from the PC with Centroid 2 Server running.
How does the BQMS test jar/cell resistance?
The system injects 400mA to 2A (max.) AC current for a duration of 900ms per jar / cell. During the 900ms duration is (3) 300ms tests. The average of these (3) tests is used as the final test result.
Which parameters are measured in real-time?
String voltage, current, and ambient temperature are measured in real-time, values are continually updated on the BQMS screen and in the software.
Which parameters are measured on interval and what is that interval?
Cell voltage, cell resistance, and cell temperature are measured on set intervals. These intervals can be set at any time from every 10 min. to once daily. In the event of a discharge these parameters will be measured continually until the discharge has ended.
How long does the system take to measure the resistance of the whole string?
About 30 seconds.
Does the BQMS have any dry contact relays?
Yes, by default the BQMS has dry contact relays for the following parameters: string voltage, string current, cell resistance, cell voltage, and temperature. Additionally, up to (8) external devices can be wired into the BQMS dry contact inputs.
What are the communication options for the BQMS?
There are two standard communication options for the BQMS (only one communication method can be utilized per system).
- TCP/IP to Eagle Eye’s proprietary software Centroid 2 – This option provides the most information about the health of the battery system as the software was specifically designed to take full advantage of the BQMS measurement data.
- Modbus protocol over TCP/IP – This option should be used if the measurement data will be integrated into an existing building management of SCADA system. (External PC required per system)
Are there any options for using Eagle Eye’s software in addition to Modbus protocol?
Yes, a single BQMS can communicate via TCP/IP to a dedicated PC with Centroid 2 installed. Through the software, Modbus protocol can output from the PC. Each BQMS system requires its own server PC for this solution and is offered as complete kit.
Is the BQMS hardware rated as explosion proof?
The hardware is not officially rated as explosion proof, however it was designed to be mounted and exposed permanently in a battery room environment. If ex-proof is absolutely required then cabinet solutions are available to meet any specific requirements.
Can the BQMS measure lithium battery types?
No, currently the system cannot measure any type of lithium battery.
Do the BQMS modules need to be grounded?
No, the modules do not need to be grounded because they are powered by DC from the battery.
What frequency does the BQMS use during measurement?