HL
FR Join waitlist

HullSentry · DC leakage monitoring for aluminium boats

Catch DC leaks before they threaten your aluminium hull.

Purpose-built for aluminium boats, HullSentry monitors up to 4 battery banks from 12 to 48 V, records historical trends, sends automatic alerts, and helps you find the circuit causing the problem.

Join the waitlist See how it works
Front view of the HullSentry facia: leak-location lights for banks A to D, insulation status lights, and an LCD showing a live reading for terminal A+.
Exploded view of HullSentry showing the enclosure, populated measurement PCB, user-interface PCB, LCD and front panel.

How it works

Scans up to 4 battery banks for DC hull leaks.

HullSentry checks the positive and negative side of each battery bank against the hull reference, logs numerical readings, and keeps simple panel status visible through the LCD and leakage level LEDs.

Peace of mind, without remembering to use the tester.

Automatic periodic scanning

Install the device and forget about it.

In monitoring mode, the device wakes every 10 minutes, scans all battery banks for leaks, stores the readings, updates status LEDs, and if necessary raises an alert by email, sounds a buzzer, or activates an external relay if configured.

Actual trends, no more wondering when it started.

History instead of one-off checks

Traditional indicators show the present condition. Logged trends help owners see whether a conductor is stable, slowly changing, or moving during solar panel operation, shore-power use, or heavy rain.

Actual Ohm values and sound feedback while you work.

Live troubleshooting mode

Select one battery terminal and watch the live value change as you work. Fixing one leak in presence of another has a noticeable effect, contrary to pure LED-based monitors.

Higher and lower beeps keep you aware of changes while you are working deep in the hull, without calling someone back at the panel to read values to you.

Use this attended mode only while actively troubleshooting. It automatically returns to periodic scanning after one hour.

Capabilities

Key specifications.

  • Power input: 12 V or 24 V DC, reverse-polarity protected. This powers the unit itself, and is separate from the banks it monitors.
  • Battery monitoring: up to 4 nominal 12–48 V battery banks, positive and negative, for 8 monitored wires. A 48 V bank can be monitored even though the unit itself runs from 12 V or 24 V.
  • Automated scans: all monitored battery banks are scanned automatically every 10 minutes.
  • Alerts: sound alerts with a mute function, email alerts if Wi-Fi is set up, and external relay output.
  • Controls: a dedicated hardware button for each routine function, so there are no LCD menus to navigate. The one exception is Wi-Fi pairing, which is a press-and-hold on the Wi-Fi button.
  • Status LEDs: visual alerts.
  • Wi-Fi: connect to the onboard Wi-Fi to send email alerts and access the historical data dashboard.
  • Web portal: visualize your data or download it as a .csv text file.

Blog

VDO leak tester with a red LED lit Electrolysis on an aluminium sailboat: lessons from 10 years aboard, condensed into one short article HullSentry breadboard proof of concept with a Raspberry Pi and an LCD Why I created HullSentry

Join the waitlist

Get product updates and launch news.

Join the waitlist for updates, installation notes, early availability announcements, and preferential launch pricing.

Success, you are on the waitlist. Opening a quick optional survey…

Waitlist members receive preferential launch pricing.

Bottom view of the HullSentry enclosure showing the field-connection terminal openings and the printed service label.

Important note

HullSentry is purpose-built for aluminium boats. It can operate on a steel hull, but it is not intended or recommended for steel boats, where its practical value is limited. It supports troubleshooting, but it is not a replacement for a qualified marine electrician.