====== BM-SS ======

**BTMS String master**


<WRAP column 450px>

{{wiki:01_btms:media:00_hw:bm-ss.jpg?nolink&400|}}

</WRAP>

<WRAP column 300px>

| Order code:  ^ BM-SS-A1          ^
| Mounting:    | DIN rail, 85 mm   |
| Dimensions:  | 85 × 120 × 39 mm  |

</WRAP>
<WRAP clear></WRAP>

===== Highlights & Features =====

  * Real-time monitoring of string voltage, charge-discharge current, charge-discharge state and string SOC.
  * Monitor the voltage, impedance, temperature, SOC and SOH of each battery with BM-CS cell sensors and the specially designed isolated power bus.
  * Advanced one-step auto-sensing for individual address. No more manual intervention and setup needed, reducing workload and setup errors.
  * Advanced measurement algorithm, no need to discharge large current and measurement can be lossless.
  * Balancing function: Keep voltage balanced during the floating charge process of battery pack, keeping the individual battery in the best state, extending backup time and life span of battery pack.
  * Communication is based on power-isolated RS485. Secure and stable.
  * Quickly locate the alarmed or faulty battery pack in machine room.
  * External split-core Hall Sensor, measuring charge-discharge current in different ranges.
  * Isolated voltage in communication interface: AC 3750V
  * Supports up to 120 batteries (BM-CS)
===== Technical specification =====

|<600px 200px 100px>|
^ Power supply           | Nominal                      | 24 VDC           |
| :::                    | Range                        | 12 .. 36 VDC     |
^ Power loss             | ≤ 2W                                           ||
^ Operating temperature  | Standard                     | 0 .. 45 °C       |
| :::                    | Limit                        | -10 .. 55 °C     |
^ Storage temperature    | -40 .. 70 °C                                   ||
^ Working humidity       | 5 .. 95 %RH, non-condensing                    ||
^ Dimensions:            | Width                        | 85 mm            |
| :::                    | Height                       | 105 mm           |
| :::                    | Height max                   | 120 mm           |
| :::                    | Depth                        | 39 mm            |
^ Voltage measurements   | Range                        | 20 .. 800 VDC    |
| :::                    | Accuracy                     | ± 0.5 %          |
| :::                    | Resolution                   | 0.01 VDC         |
^ Current measurements   | Range                        | -1000 .. 1000 A  |
| :::                    | Accuracy                     | ± 2 %            |
| :::                    | Resolution                   | 0.01 ADC         |


**LED indicator**

|<600px 200px>|
^ Normal operation  | Green LED  |
^ Alarm             | Red LED    |

===== Wiring =====

{{wiki:01_btms:media:00_hw:bm-ss_wiring.png?nolink|}}