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Author Topic:   Onboard 120-VAC Battery Chargers
jimh posted 11-08-2013 11:59 AM ET (US)   Profile for jimh   Send Email to jimh  
ProMariner of New Hampshire have introduced a new line of their ProSport onboard waterproof 120-VAC battery chargers, which they call their Gen3 series. The Gen3 series seem to feature more advanced charging voltage profiles. Here is an excerpt from the owner's manual for a ProSport Gen3:


Multi-Stage Charging Overview

ProSport Charging: During this mode the “Charging” indicator will be red. ProSport will use all of its available charging amps (as controlled by temperature) until the battery voltage is raised to 14.6VDC (Flooded lead-acid factory setting).

ProSport Conditioning: During this mode the “Conditioning” status indicator will be amber. Batteries will hold at 14.6 VDC (factory set for Flooded lead-acid batteries) to complete charging while conditioning each battery connected. Upon completion the ProSport will go into its maintain mode.

ProSport Ready / Maintain: During this mode the “Ready/Maintain” status indicator will be green and remain on with the blue “power” LED indicating that your batteries are fully charged while being maintained at a precision 13.4 volts (factory set for Flooded lead-acid batteries) and are ready to go when you are.

ProSport Storage Recondition Mode: During this mode the ProSport “Recondition Mode” green indicator will illuminate with a slow fade in and out pulse indicating that while your batteries/boat are in storage the ProSport will automatically recondition all batteries for up to 3 hours once a month extending battery life and maximizing on the water battery power performance.

The charging profile can be altered by changing a "cap" that connects a socket on the charger. The default profile is the set with the black cap, which is said to be useful for lead-acid batteries of flooded cell and AGM construction. There is an alternative profile for gelled electrolyte batteries, set with a gray cap. On certain models there is also an option to install a profile specific to the Optima BLUE TOP deep cycle battery or the Odyssey AGM marine battery; this is set with a blue cap, called the AGM HP programming cap.

This multiple phase charging method seems to be an improvement over earlier models which tended to offer only a constant voltage output for charging. The owner's manual includes this graph showing the voltage characteristics of the ProMariner ProSport Gen3 charger:

Graph of charging voltage at various phases for default setting of charger.
Charging profile for factory installed black profile cap

Although ProMariner is located in New Hampshire, I believe you will find that their products may be assembled in Asia. Visit waterproof-on-board-marine-battery-chargers/prosport-series/

for more information.

I do not have any affiliation with ProMariner, but I have purchased and used one of their chargers, and it has worked well for me for over five years. If I were inclined to buy a new onboard charger, I would give these ProSport Gen3 units a close look.

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