Add battery
This page covers the device-specific wiring for a battery. For general device setup and settings, see Add a device.
The battery monitor tracks voltage continuously, alerting you when a battery falls below a safe level or rises above a charging threshold. Useful for house banks, starting batteries, or any DC source up to 30 V.
Uses a battery slot (10–13) on the BRNKL connector.
Prerequisites
3 A fuse and inline fuse holder
Access to the battery positive terminal
An available BRNKL battery slot (10, 11, 12, or 13)
Always fuse the positive wire within 150 mm of the battery terminal. Connecting an unfused wire to the battery positive is a fire hazard.
Wiring
Run a wire from the positive battery terminal through a 3 A fuse to an available battery slot: 10, 11, 12, or 13.
Connect the wire unswitched — directly to the battery terminal, not downstream of a switch — so BRNKL can monitor voltage even when other circuits are off.
The battery negative uses the shared ground; no separate ground wire to the battery slot is needed.
Note which slot you use — you will need it when configuring.
Configure
In the BRNKL app, go to Settings > Devices and select the input matching your slot:
Slot | App setting |
|---|---|
10 | Battery 1 |
11 | Battery 2 |
12 | Battery 3 |
13 | Battery 4 |
This is a Battery input. Recommended settings:
Monitor — on
Alert — on
Name — e.g., House battery or Start battery
Low Voltage Alert (V):
12 V system: 11.5 V
24 V system: 23.0 V
High Voltage Alert (V) — optional, for overvoltage faults:
12 V system: 14.5 V
24 V system: 29.0 V
Tap Save.
Test
Wait 15 minutes for settings to sync.
Confirm the dashboard tile shows a voltage reading.
Using a multimeter, measure voltage directly at the battery terminals and confirm it matches the dashboard reading within 0.2 V.
Troubleshooting
No voltage reading on dashboard — check the fuse, verify the wire is in the correct battery slot, and confirm Monitor is enabled in the app.
Reading is significantly off — use Offset Voltage in the app to calibrate. Measure the actual voltage at the terminals and adjust the offset until the dashboard matches.