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Guest 12v 24v 36v 30 Amp CHARGEPRO 3 Bank On-Board Smart Charger

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Product InformationStore Part Number: 2731A


Replaces: Guest GU2631A, Marinco 28330

The Guest 2731A On-Board battery chargers have been redesigned from the inside out with the customer in mind. The 2731A charger is a marine waterproof IP67 rated charger that has three 12v outputs. These 12v outputs have a rating of 12v 10 Amps each for the combined 30 amp rating.

The Guest 2731A can be used for three 12v banks, one 24v battery bank, or one 36v battery bank. Typical installation is for 24-volt series system using two 12v batteries for a trolling motor and an additional bank for a starting 12v battery. Another popular installation is for a 12-volt trolling motor battery and two 12v starting motor batteries.

The newest generation Guest On-Board Marine battery chargers include leading advancements in digital charging technology and waterproof design/construction. Every Guest charger has a dedicated charging, sensing and control per bank. The easy to read graphics indicates the status of each battery bank through the charging process.


  • For Flooded & AGM Lead Acid Batteries
  • All high frequency, digital charging technology
  • Fully automatic 5-stage performance charging
  • Dedicated battery charging, sensing and control per bank
  • Expanded LED charge status monitor
  • Wiring and battery fault detection
  • Auto-maintain energy saver mode
  • Up to 40 percent lighter
  • 100 percent Waterproof (IP67) and shock resistant for all fresh and saltwater applications
  • Pre-wired for easy installation
  • For 12 volt flooded and AGM lead acid batteries
  • Built-in safety: reverse polarity, over-current, over-voltage, over-temperature and ignition protection. In-line fuses for maximum DC wire protection.
  • 2 year warranty


Recommended uses: Bulk charge of flooded and AGM maintenance free batteries group 24 (Approx 75 AH) through group 31 (Approx 110 AH), and charge/maintenance of batteries partially discharged up to 150 amp hours. Not Recommended for 6 Volt Batteries, 4D or 8D batteries, or any combined battery amp/hr over 150 AH per battery bank.

Tech Specs

  • Dimensions (LxWxH): 9.69 x 9.27 x 4.1 in
  • Weight: 10 lbs
  • Shipping Weight: 16 lb
  • AC Input Amps: 8.4 A
  • AC Input Volts Range: 90-135 V
  • AC Input Volts Freq.: 50/60 Hz
  • Max Current, During Bulk Charge: 30 A (10A/10A/10A)
  • Min Battery Voltage Per Bank: 4.0 V
  • Model: 2731A
  • Manufacturer: Guest/Marinco
  • Absorption Voltage: 14.6 V
  • Absorption Output Current: 2-10 A
  • Float Voltage: 13.4 V (Auto Maintain Energy saver mode)
  • Enclosure: Plastic Composite
  • Output Banks: 3
  • Waterproof: IP67 Rated
  • Regulatory Approval: Conforms to UL STD. 1236 / Certified to CSA STD. C22.2 No. 107.2 / FCC Class B / Design and Constructed to ABYC A-31 / CEC Listed
  • RoHS: Compliant
  • Manufacturer Part #: 2731A
  • UPC: 046904904143
  • Made In: Asia

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Rated 4.00/5 Stars from 1 customer reviews.

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So far so good.
Just installed this in my 2010 Nitro Z-7 as a replacement for the original Quest charger. So far so good. Installation was simple, everything was labeled for an easy install. Only thing I wasn’t happy about was this charger had to be mounted vertically, when my older one was mounted horizontal. I don’t remember reading this on the website, but was in the instructions. Hopefully this one lasts as long as the original one (9yrs).
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Written by on Aug 17, 2019. Verified Purchase — (2 of 2 customers found this review helpful

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