Onboard chargers
ProMariner ProSport HD 20A 3-bank waterproof onboard charger: published specifications
Quick answer
The ProMariner ProSport HD 20A 3-bank waterproof onboard charger publishes 3 specifications and currently lists at $250.73. charging banks 3, total output 20 A, waterproof Yes. Every figure below is the manufacturer own, and nothing on this page is estimated.
Twenty amps across three banks in a waterproof case, which is the common upgrade when a 36 volt bank outgrows a five amp charger.
This sheet exists because comparing two pieces of marine equipment usually means opening two listings in two tabs and reading past the marketing. Everything ProMariner publishes for this unit is in one table below, followed by the same figures for the nearest alternatives in its category.
Published specifications
ProMariner publishes 3 figures for the ProMariner ProSport HD 20A 3-bank waterproof onboard charger.
Published figure A published engineering, regulatory or manufacturer figure. It does not change because somebody disagrees with it.
| Specification | Value |
|---|---|
| Charging banks | 3 |
| Total output | 20 A |
| Waterproof | Yes |
What the manufacturer says
The listing bullets below are the manufacturer own words, reproduced rather than paraphrased so that anything claimed here can be attributed to them rather than to us.
These are ProMariner own claims for the ProMariner ProSport HD 20A 3-bank waterproof onboard charger, quoted rather than rewritten.
Published figure A published engineering, regulatory or manufacturer figure. It does not change because somebody disagrees with it.
| Manufacturer claim |
|---|
| ProSport HD 20A Triple Bank Waterproof Marine Battery Charger (Part Number 44021) replaces the old ProMariner Gen 3 ProSport 20 plus (part number 43021) |
| ProMar Digital Technology: Microprocessor and software controlled charging technology for fast, precise charging |
| Distributed-On-Demand Technology: 100% of all available charging amps are utilized by distributing unused charging amps to any one or combination of all batteries as needed |
| Heavy Duty Tri-Surface Extruded Heat Sink Design: Upper, lower and rear facing heat sink design for optimal cooling while delivering true rated constant current charging amps during its two charge mode |
| Expanded LED Display with Completion Status Gauge: LED fuel gauge style completion status. Four color multi-stage mode LED status bar. Multi-stage Charge Mode, System Check OK, individual Battery Status and Battery Type indication |
Against the nearest alternatives
The closest products by price in the same category, with the same published figures side by side. A cell reading "not published" means that maker does not state the figure, which is frequently the most useful thing on the row.
| Specification | ProMariner ProSport HD 20A 3-bank waterproof onboard charger | Minn Kota MK-220PCL onboard charger, 2 banks 10 amps | NOCO GENPRO10X2 12V 20A 2-bank onboard charger | NOCO GEN5X3 12V 15A 3-bank onboard charger |
|---|---|---|---|---|
| Price | $250.73 | $242.57 | $224.95 | $199.95 |
| Charging banks | 3 | 2 | 2 | 3 |
| Total output | 20 A | not published | not published | not published |
| Waterproof | Yes | not published | not published | not published |
| Output per bank | not published | 10 A | 10 A | 5 A |
| Lithium charge profile | not published | Yes | not published | not published |
| System voltage | not published | not published | 12 V | 12 V |
Every figure above is the manufacturer own published specification. Where a maker does not publish a figure the cell reads "not published" rather than carrying an estimate, because on ratings and currents an estimate that reads as a specification is a safety problem rather than a gap.
What is not on this page
Anything ProMariner does not publish. We do not estimate a missing figure, interpolate one from a neighbouring model, or repeat a number from a forum. In this category the specifications are ratings and currents, and a reader comparing two products on a grid cannot tell a published rating from an estimate, so an estimate that reads as a specification is a safety problem rather than a gap.
If a figure you need is missing here, it is missing from the manufacturer own listing, and the place to find it is the product manual or the maker technical support rather than any third party table.
Frequently asked questions
What are the ProMariner ProSport HD 20A 3-bank waterproof onboard charger specifications?
ProMariner publishes 3 figures for this unit: charging banks 3, total output 20 A, waterproof Yes. Everything in the table above comes from the manufacturer own listing rather than from measurement or estimation, and anything the maker does not publish is left out rather than guessed at.
How much does the ProMariner ProSport HD 20A 3-bank waterproof onboard charger cost?
It currently lists at $250.73, though prices in this category move constantly and the figure on the product page is the one that governs. Where two products are close on price, the specification table above is usually a better guide to which is right for your boat than the difference between them.
Are these figures measured or published?
Published. Every number on this page comes from the ProMariner listing for this exact unit. We do not test equipment in person and we never claim to, and nothing here has been derived, interpolated or rounded from another model. That is also why some rows in the comparison table read "not published" rather than carrying a number.
Why do some comparison cells say not published?
Because that manufacturer does not state that figure for that product. Makers publish different subsets of specifications, and rather than fill the gap with an estimate we leave it visible. On ratings, currents and capacities an estimate that reads as a specification is how somebody ends up with equipment that does not do what they believed it would.
Is this the current model?
It is the unit at this listing, which is the most reliable way to identify a specific product in a category where model names get reused across generations. Manufacturers frequently sell several generations alongside each other, so check the model number in the title against the one you are comparing rather than relying on the family name.
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Researched, not professional advice. This page is compiled from published engineering and regulatory figures, manufacturer specifications and owner-review consensus, not hands-on testing. Figures described as a rule of thumb are boating convention rather than published standards, and they are labelled that way wherever they appear. Marine electrical work is not house wiring. Use tinned, finely stranded marine cable, size it for voltage drop and for the ABYC E-11 ampacity table rather than one or the other, and put overcurrent protection within seven inches of the battery positive terminal, because everything between the post and the fuse is unprotected. A lithium battery needs a charger with a lithium profile. Never load a boat past its capacity plate, and remember that canoes and kayaks carry no federal capacity plate at all, so their stated capacity is the manufacturer own figure. Wear the life jacket, and treat early season water as the hazard it is: cold water immersion takes your breath and then your hands long before it takes your core.