01
Basics, covered
12 / 24 / 48 V universal. P-type and N-type alternators. Three-stage charging (bulk / absorption / optional float) with intelligent tail-current detection and re-bulk logic. Third-party BMS integration.
Open-source alternator regulation for lithium battery systems
Launch Pricing
$390
MSRP: $590
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02
Industry's lowest price
$390 launch / $590 MSRP. Far less capable options land north of $700–$1,200.
03
Open hardware, Open software, Open everything
Schematics, source code, design documentation. No black boxes, no secrets.
04
Live telemetry
Your phone, tablet, or laptop dashboard streams 34 control-loop values at 10 Hz, plus >400 diagnostic values every 5 seconds.
05
Deep history — on device and in the cloud
80 hours of high-resolution data stored locally; indefinite cloud history on top. Long-trend plots across years of cruising.
06
Strava-style fleet community
Global leaderboards for distance, days at sea, alternator and solar output, speed by boat type, and much more. Public fleet stats page.
07
First-class control architecture
Three cascaded PID loops with position-form PI, anti-windup, slope-aware integrator bleed, predictive rate-of-rise overvoltage protection, and bumpless transfer on every mode change. Smooth charging that won't spike, oscillate, or hunt.
08
Safety focus
Multi-layer thermal, voltage, and current protections. Redundant hardware safety that cuts output even if the firmware fails. Battery load-dump detection, sensor cross-validation, and staleness detection.
09
Performance fingerprinting and life prediction
168-cell field-efficiency matrix (RPM × temperature × field voltage) builds a reference performance fingerprint, then alerts on anomalies and tracks normal wear. Physics-based component life model predicts time-to-failure from actual usage.
10
Motion comfort scoring
On-board 6-axis IMU tracks heel, pitch, wave period, and slams. Computes a standardized Motion Sickness Index plus anchorage and passage comfort scores.
11
NMEA 2000 + Victron + WiFi + cloud
CAN, VE.Direct serial, WiFi (AP and client), Supabase cloud sync, secure OTA updates. Optionally pulls wind, GPS, heading, and other data from your boat network.
12
Built-in battery monitor
20-bit voltage and current resolution (TI INA228). Benchmarked against Victron. No second device required — use your existing shunt.
13
Premium sensor suite
Digital alternator temperature sensor, Hall-effect alternator current sensor, 6-axis accelerometer + gyro, precision barometer.
14
Robust and durable
Designed for electrical, weather, and environmental extremes. Conformal-coated PCB. EMI hardened. Reverse-polarity protected.
15
No-headache install
No proprietary harnesses — splices into your existing wiring. WiFi
access-point mode for first-time setup with no boat network required.
Auto-discovery at alternator.local. USB-C programming.
16
Hardwood cherry enclosure
Unique dovetail docking design for tool-free removal. Polyurethane finish.
Cruising Intelligence Network
Each regulator optionally contributes to a shared, anonymous dataset of real-world vessel performance, conditions, and energy use, going far beyond the alternator.
- Anchorage and Passage Comfort — motion-based scoring derived from onboard accelerometer data
- Speed & Efficiency — real-world performance comparisons across similar boats
- Energy Production and Use — alternator and solar output across different climates, seasons, and usage patterns
- Exploration History — track ports visited, passage lengths, and fleet cruising patterns
- Leaderboards and Records — highlights top performance across the fleet
Tech
GitHub
Hardware and software source.
MkDocs
Installation guide, engineering notes, technical deep dives.
About
X Engineering exists because alternator regulation turned out to be harder, more interesting, and more fun than expected — and because modern AI tools arrived at exactly the right time.