The ProMariner ProMar1 DS Digital is a compact 5-amp single-bank onboard charger with a four-stage charge sequence and built-in fault detection. It comes pre-wired with waterproof inline DC fuses and nickel-plated copper ring terminals, so installation is simpler than most onboard chargers.
Who it’s for
- Small boats with one battery kept on shore power, a lift, or a trailer
- Seasonal maintenance charging
- First-time onboard charger installs
Key features
- 5A single-bank output
- Four-stage charging: analyze, charge, condition, maintain
- Battery and wiring fault detection
- Auto-maintain / energy-save mode
- Pre-wired waterproof inline DC fuses and ring terminals
Choosing a charger
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Count your banks. Each battery bank needs its own charger output.
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Match the chemistry. Flooded, AGM, gel, and lithium batteries need different charge profiles.
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Size the amps. 5A suits maintenance and overnight charging of a single battery. See our marine battery charger guide.
Related: battery and power
Before ordering
Confirm battery voltage and chemistry, bank size, AC input, cable reach, and mounting location.
What you're getting
Brand: ProMariner
Part Number: 31505
Fulfillment: Ships from a U.S. marine distribution warehouse
Warranty: Manufacturer warranty terms vary by brand and product
Shipping & returns
Shipping options and charges are shown at checkout. Orders normally ship from a U.S. distribution warehouse. Manufacturer warranty eligibility and claim procedures vary by brand; review the manufacturer’s current terms before ordering. Questions can be sent to support@sonarkmarine.com.
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