BAINTECH BM21 Smart Battery Monitor User Guide
- October 30, 2023
- BAINTECH
Table of Contents
BAINTECH BM21 Smart Battery Monitor
Product Introduction:
The BM21 Smart Battery Monitor is a high-precision meter that allows you to
check the status of your battery via the monitor display or your smartphone
with Smart Battery Monitor app. Through the use of the current shunt, the
battery monitor measures the discharge or recharge currents and calculates the
Ampere-hours (Ah) going in and out of the battery. High-precision voltage
measurements are taken and displayed in real-time through the use of a field-
installed sense wire. The BM21 monitor is compatible with all types of
batteries including Lithium-ion, lead-acid and nickel-metal hydride
batteries..
Applications:
Suitable for traction/mobile and stationary applications.
- Golf Carts & Utility Vehicles
- Marine RVs
- Solar Energy Storage
- Aerial Work Platforms Robots
Data Displayed:
- Battery Voltage
- Battery Current
- Battery State of Charge (SOC)
- Total Ampere-hours
COULOMETER BATTERY MONITOR
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Voltage | 10.0 | 80.0 | V |
| Current | 0.0 | 75.0 | A |
| 0.0 | 150.0 | A | |
| 0.0 | 500.0 | A | |
| Capacity | 0.1 | 999.0 | Ah |
| Temperature | 0.0 | 35.0 | °C |
| Working dissipation | 14.0 | mA | |
| Standby dissipation | 0.8 | mA | |
| Sleep disspation | 80.0 | uA | |
| Voltage Accuracy | ±1 | % | |
| Current Accuracy | ±1 | % | |
| Capacity Accuracy | ±1 | % |
Included Components:
- Current shunt Shielded wire (1 M)
- Display
- Butterfly nut
- Sense wire 22AWG (1M)
Additional Components Needed For Installation:
- Additional battery cable
- 54mm hole saw or knock out tool ( for rear mount applications)
- Bezel square ( for front mount applications)
- 1A fuse (recommended)
Battery Display:
Dimension:
Monitor Display Installation:
- Use a hold saw to cut a 55mm hole in the surface on which the battery monitor is to be mounted.
- If you can access the hole from the rear, insert the monitor into the hole from the bracket over the stud and screw the wingnut onto the stud and tighten until the bracket is firmly holding the display in place.
- If you cannot access the hold from the rear, then you can use the bezel square (option component), following similar steps as specified in point 2.
Then use the 4 screw holes to attach the monitor with the bezel square from the front of the hole.
Electrical Connections:
NOTE: Given the multitude of different applications for which this monitor can
be used, the correct gauge of wire to be used is not specified. If you are
unsure of the correct gauge for your setup, please consult a qualified
automotive electrician or contact EJ technical support for advice.
As shown in figure 3:
- Connect the “B-” terminal of the shunt by running a cable to the negative terminal of the battery.
- Connect all the load and charger negative cables to the “P-” terminal of the shunt, or if these cables are combined onto a bus bar or fuse box, then run a cable from the bus bar or fuse box.
- Connect the sense wire to one of the two terminals marked “B+” on the shunt, and connect the ring connector to the positive terminal of the battery.
- Finally, connect the monitor’s shielded display cable (already attached to the display) to the shunt.
Preparation Steps:
Fully charge the battery bank such that it reaches 100% SOC. Failure to take
this step will lead to erroneous SOC readings.
Setting Up The Battery Monitor:
- Ensure the battery display indicates the discharge current and the charge current correctly. Use the charge and discharge indicators to ensure it is capturing the appropriate current direction (in/out).
- Ensure that the battery voltage is displayed correctly.
- Fully charge the battery bank such that it reaches 100% SOC.
- To initialize the capacity, press the % button for three seconds to set the capacity to 100%.
- To enter the capacity, press the A/Ah button for three seconds. Use the V button and the % button to increase or decrease the capacity. Press the A/Ah button when done.
Connecting To The Smart Battery Monitor App:
- Install the Smart Battery Monitor app via Google™ or the Apple App Store. You can search for “Smart Battery Monitor” or use the provided QR codes.
- Open the app and select the Battery Monitor by its serial number.
- At the ‘SETTINGS’ screen, enter the battery parameter information required followed by tapping ‘SAVE SETTINGS’ on the bottom.
- Tap the setting button on the top right, into the ‘CALIBRATION’ screen, enter the battery parameter information required, followed by tapping ‘SAVE SETTING’ at the bottom.
- You will now be in the dashboard where you can monitor the battery’s state of charge, voltage, current, time remaining and the cycle life.
- Your smart battery monitor is now ready to use.
Technical Support: If you have technical questions about your Battery Monitor, please contact the original place of purchase or EJ directly.
Warranty: One-year limited warranty.
Email: [email protected]
Web: www.appbattery.com