KONNWEI BK300 – Bluetooth Battery Monitor & Electrical System Tester for 12V/24V Car & Truck (BKmonitor app)

Introduction – What Does BK300 Do?

The KONNWEI BK300 keeps an eye on your battery health and the entire electrical system – around the clock. It continuously measures and logs voltage, presents clear waveforms, and automatically alarms if anything deviates. During startup, you can view the cranking test (voltage dip & start time), and while running, you can follow the charging test (alternator/regulator, ripple indication via waveform). Everything is saved in the app so you can see trends over time, share reports with customers/colleagues, or troubleshoot intermittent problems.

• Always On: Ultra-compact module on the battery; low consumption (~3 mA).
• Push Notifications: Under/overvoltage directly on your mobile.
• Waveform: Live curves for starting and charging provide better diagnostics.
• Fleets: Helps you prevent no-starts in car parks/trucks.
• 24V: Handles passenger cars (12V) and trucks/buses (24V) in the same product.
• Lifetime Updates: The app improves – you keep up without extra cost.

Specifications (bullet points)

• Model: KONNWEI BK300
• Type: Bluetooth battery & electrical system monitor (permanent installation)
• System Voltages: 12V and 24V
• Input (measurement range): 3–60V, ≈3mA self-consumption
• Display in App: Waveform (live), history, reports
• Tests: Cranking test (start), Charging test (charging)
• App: BKmonitor for iOS (App Store) & Android (Google Play)
• Languages (app): Chinese, English, German, French, Japanese, Korean, Dutch, Russian, Spanish, Italian, Portuguese, Polish, Persian
• Functions in app: Waveform, voltage collection, change Bluetooth name, free firmware, problem reporting, share report, language selection
• Battery Types: Flooded/WET, AGM flat, AGM spiral, EFB, VRLA, GEL, Lithium
• Material: ABS, black; attachment: Y-terminals
• Certificates: CE, FCC, RoHS, REACH
• Color: Black
• OEM: Supported (for volume – logo/packaging/manual etc.)

Features & Use Cases

• 24/7 Monitoring: Keep track of voltage levels and trends – minimizes downtime.
• Start Diagnosis (Cranking): Do you see a strong voltage dip indicating the battery isn't charging or the starter motor is struggling?
• Charging Diagnosis: Flat/excessive waveform? Possible regulator/rectifier issue in the alternator.
• Push Notifications: Set limits for under/overvoltage and receive alarms before the vehicle fails to start.
• Shareable Report: Export & share results as documentation for action/customer dialogue.
• Fleet Mode: Install in each vehicle – the app warns when levels drop in an individual vehicle.
• Languages & Updates: Many UI languages, lifetime free app updates.
• Low Consumption: ~3 mA makes it suitable for permanent installation.

Compatibility: Voltages & Battery Chemistries

The BK300 works with both 12V (passenger car, van, boat's starting bank, motorcycle) and 24V (truck, bus, construction equipment). Support for most lead-acid chemistries and also Lithium according to manufacturer specifications. For lithium, you should ensure that the battery's BMS allows external monitoring and that the voltage levels/limits in the app are reasonably set.

• WET/Flooded: Classic starting/service batteries.
• AGM (flat/spiral): Common in start/stop and performance applications.
• EFB/VRLA/GEL: Low self-discharge, requires correct voltage levels in operation.
• Lithium: Voltage monitoring OK – follow battery manufacturer guidelines/BMS requirements.

The BKmonitor App – Views & Reports

• Live Waveform: See the voltage curve in real-time – reveals starting dips, ripple, and transients.
• History: Day/week/month – detect slow degradation and parasitic drain.
• Cranking/Charging: Automatic tests with clear green/yellow/red assessment.
• Notifications: Configure alarm levels – get push notifications for deviations.
• Change BT Name: Name devices by license plate/vehicle ID – perfect for fleets.
• Share Report: Send PDF/screenshot to customer, workshop, or colleague.
• Firmware/App: Free updates, problem reporting directly in the app.

BK300 vs BM2 – What extra do you get?

Many are familiar with classic Bluetooth monitors (BM2). The BK300 takes the concept further with:

• 12V and 24V in the same unit – covers passenger cars, boats, and heavy-duty vehicles.
• Waveform view for both starting and charging – simplifies real diagnostics.
• More languages and fleet-friendly features (name change, sharing, history, alarms).
• Lifetime app updates and free firmware via the app.

Note: Features may vary between BM2 variants. The point above describes the added value of the BK300 according to manufacturer specifications.

Manual & Installation Guide (step-by-step)

A. Preparation & Safety

1. Park safely, turn off ignition and all loads. Use safety glasses and gloves.
2. Identify the main battery (or battery bank) to be monitored.
3. Check that the terminals are clean and free from oxidation.

B. Installation Steps

1. Disconnection (recommended): Briefly loosen the negative terminal for safe installation.
2. Install BK300: Attach the unit's Y-terminals to the battery terminal screws: red to +, black to −.
3. Route cables so they are not pinched. Reconnect the negative terminal if necessary.
4. Mount the unit in a vibration-free location near the battery.

C. App Pairing & Basic Setup

1. Download BKmonitor (iOS/Android). Enable Bluetooth.
2. Open the app → add device → select your BK300.
3. Select language, vehicle, and battery chemistry. Set reasonable alarm limits for under/overvoltage.
4. Change BT name to license plate or vehicle ID if desired.

D. First Tests

1. Resting Voltage: Note the voltage after 2–3 hours of rest (SOC-indicative for lead-acid).
2. Cranking Test: Start the engine – observe start dip and start time in the waveform.
3. Charging Test: Let the engine run – check charging voltage and ripple. Turn on loads (lights/fan) and compare.
4. Save History: Naming the log makes it easy to compare over time.

E. Report & Sharing

1. Open history → select date/session → Share Report (e.g., to customer or workshop case).

Troubleshooting & Common Symptoms

• No BT Connection: Check phone's BT, close other BT apps, power cycle app/phone.
• No Data: Ensure correct terminal connection (red + / black −) and good contact with terminal screws.
• Frequent Alarms: Adjust alarm limits; check for parasitic drain and battery condition.
• Low Starting Dip: Battery may be weak, poor terminal contacts, heavy starter motor, or stiff engine (cold/oil).
• High Ripple: Possible rectifier/regulator fault; check alternator with supplementary test.
• 24V Truck: Ensure BK300 is on the correct bank and that alarm levels are adapted for 24V.

Frequently Asked Questions (FAQ)

1. Does the BK300 drain the battery?

The unit's self-consumption is very low (≈3 mA) and suitable for permanent installation. For long-term storage: connect a maintenance charger.

2. Does it work on Lithium?

Yes, according to the manufacturer, Lithium is supported. Set appropriate alarm levels and ensure that the battery's BMS allows external monitoring.

3. Can multiple vehicles be monitored?

Yes, install one BK300 per vehicle and change the name in the app (license plate/ID). You can switch between them in the app.

4. Do I have to disconnect the battery for installation?

It is recommended to briefly loosen the negative terminal for safe installation, but many install carefully directly. Always follow safety procedures.

5. What do cranking and charging tests mean?

Cranking measures voltage dip and start time. Charging assesses the alternator/regulator (voltage/ripple) during operation.

6. Can I export reports?

Yes, Share Report from the app – convenient for customer dialogue and workshop documentation.

7. Do I get real-time alarms?

Yes, push notifications for over/undervoltage (you set the limits yourself in the app).

8. Can I combine it with a fault code reader?

Absolutely. See our fault code readers for engine/emission diagnostics.

Package Contents

• 1 × KONNWEI BK300 Bluetooth battery monitor
• 1 × Cable with Y-terminals (red/black)
• 1 × Quick Start Guide

Important Notes & Disclaimer

• BK300 primarily monitors voltage (not current/SoC calculation via shunt). Interpretation is done in the app's tests & waveforms.
• Configure alarm limits reasonably for lead-acid versus lithium. Always follow battery/vehicle manufacturer instructions.
• Improper installation can damage vehicle/equipment. Installation is at your own risk.
• Specifications may be updated via app/firmware; feature availability may vary between platforms.

For supplementary diagnostic tools: see fault code readers.

Summary

The KONNWEI BK300 gives you proactive battery care and electrical system monitoring in your pocket: install the unit, pair with BKmonitor, get live waveforms, cranking/charging tests, history, and push notifications. Support for both 12V and 24V makes it equally at home in passenger cars as in heavy vehicles – and in fleets where downtime is costly. With lifetime free updates, the BK300 is a long-term smart choice for anyone who wants to avoid no-starts and troubleshoot with clear data. 🔋📈