--- product_id: 3433804 title: "ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021" brand: "promariner" price: "2594.61 DT" currency: TND in_stock: true category: "Pro Mariner" url: https://www.desertcart.tn/products/3433804-promariner-gen-3-prosport-20-amp-12-24-36-volt store_origin: TN region: Tunisia --- # 20 Amp fast charging Waterproof rugged design 3-bank simultaneous charging ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021 **Brand:** promariner **Price:** 2594.61 DT **Availability:** ✅ In Stock ## Summary > ⚓ Power your marine adventures with ProMariner’s unstoppable 3-bank charger! ## Quick Answers - **What is this?** ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021 by promariner - **How much does it cost?** 2594.61 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/3433804-promariner-gen-3-prosport-20-amp-12-24-36-volt) ## Best For - promariner enthusiasts ## Why This Product - Trusted promariner brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Battery Life Maximizer:** Automatic monthly reconditioning extends battery lifespan during storage—never get stranded. - • **Triple Battery Mastery:** 3 independent banks with Distributed on Demand Technology for optimized charging balance. - • **Charge at Lightning Speed:** 20 Amp output powers up your batteries efficiently, cutting downtime. - • **Built to Brave the Elements:** Waterproof aluminum casing ensures durability in harsh marine environments. - • **Smart Diagnostics at a Glance:** LED indicators instantly reveal system status and pinpoint faults to save troubleshooting time. ## Overview The ProMariner Gen 3 ProSport 20 Amp 3 Bank Waterproof Marine Battery Charger delivers fast, efficient charging across 12/24/36V systems with advanced Distributed on Demand Technology. Its rugged waterproof aluminum design and smart LED diagnostics ensure reliable, maintenance-free operation, while automatic monthly battery reconditioning maximizes battery health and longevity. Ideal for professional boaters seeking dependable power management in a compact, lightweight package. ## Description The 12V, 6 Amp, 1 battery bank ProSport 6 waterproof battery charger delivers fast efficient charging in a lightweight design.Distributed on Demand Technology utilizes 100% of the available charging amps and automatically distributes charge amongst all the batteries as needed . The result is faster, more efficient charging.Advanced technology eliminates time consuming troubleshooting by clearly indicating system and battery connections are OK or if a fault is present on a specific battery bank.During short or long-term storage, ProSport automatically reconditions all batteries on board once a month for maximum battery life and performance.Compact and rugged aluminum design, dual in-line DC safety fuses for trolling motor and house battery banks. Built-in over-voltage, overload, over-temperature, reverse polarity and ignition protection.Digital LED Display and Battery Type Selector: LED indicators for Charging, Conditioning and Auto Maintain modes in addition to AC power and selected battery type. ## Features - The 12/24/36V, 20 Amp, 3 battery bank ProSport 20 Plus waterproof battery charger delivers fast efficient charging in a lightweight design - Distributed on Demand Technology utilizes 100% of the available charging amps and automatically distributes charge amongst all the batteries as needed . The result is faster, more efficient charging - Advanced technology eliminates time consuming troubleshooting by clearly indicating system and battery connections are OK or if a fault is present on a specific battery bank - During short or long-term storage, ProSport automatically reconditions all batteries on board once a month for maximum battery life and performance - Compact and rugged aluminum design, dual in-line DC safety fuses for trolling motor and house battery banks. Built-in over-voltage, overload, over-temperature, reverse polarity and ignition protection - Digital LED Display and Battery Type Selector: LED indicators for Charging, Conditioning and Auto Maintain modes in addition to AC power and selected battery type ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00F5EBTGA | | Amperage | 20 Amps | | Battery Charge Time | 10 Hours | | Best Sellers Rank | #2,652,565 in Automotive ( See Top 100 in Automotive ) #3,707 in Battery Chargers | | Brand | ProMariner | | Built-In Media | battery charger | | Color | Yellow/Black | | Compatible Devices | Boat | | Connector Type Used on Cable | DC | | Current Rating | 20 Amps | | Customer Reviews | 4.6 out of 5 stars 1,322 Reviews | | Global Trade Identification Number | 00031669430211 | | Input Voltage | 36 Volts | | Item Dimensions D x W x H | 6"D x 14.5"W x 8.5"H | | Item Type Name | Waterproof Battery Charger | | Item Weight | 8 Pounds | | Manufacturer | ProMariner | | Mfr Part Number | 43021 | | Model Number | 43021 | | Number of Ports | 3 | | Output Voltage | 36 Volts | | Product Dimensions | 6"D x 14.5"W x 8.5"H | | UPC | 656727420579 690579678177 031669430211 | | Unit Count | 1.0 Count | | Warranty Description | 24 Months | ## Product Details - **Brand:** ProMariner - **Color:** Yellow/Black - **Item Weight:** 8 Pounds - **Output Voltage:** 36 Volts - **Product Dimensions:** 6"D x 14.5"W x 8.5"H ## Images ![ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021 - Image 1](https://m.media-amazon.com/images/I/71UNw3VgBlL.jpg) ![ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021 - Image 2](https://m.media-amazon.com/images/I/71yffmwkuwL.jpg) ## Questions & Answers **Q: Does this unit have a cooling fan? Does it overheat?** A: No fan. Yes it over heats. Mine died after a month and MFG service and support link, nor the registration lik work on their website. Unable to get through via phone. Had to buy a new one. I went with Charles Marine charger. Superb charger. Beware of this one. **Q: I have a single starting battery (one bank) .Then I have two deep cycle batteries in parrallel (bank 2). Do I need a 2 or 3 bank charger?** A: you failed to give the the voltage, type, and size of batteries, and what they are being used for, but going with the information you submited. providing all of the batteries are 12v d.c. you require a 2 bank charger, but if i were you, i would order the 3 bank charger for future battery expansion, i would connect one of the charger outputs across the neg & positive terminal of the stand alone 12v dc battery, and i would then connect the second charger output lead across the 12 v dc neg & positive terminal of one of the 2 batteries which are tied in parallel. the charger in question permits the 3rd charger output to be connected to the 3rd neg & positive post of the 3 rd 12 v dc battery which is tied in parallel. but if i were you, i would first contact the manufacture reps, before you do anything, tell them your set up, and see what they think. in any event good luck, and above all do not forget to ware the proper safty equiptment prior to doing any work on any batteries. **Q: I am installing this into my sailboat. What is the 110v amperage draw?** A: The power consumed by any electric unit is equal to the Operating voltage V times the current I. or Power = V*I in watts. If this charger is charging 2 batteries at 12 volts each and drawing 10 amps for each battery the power used is 12 * 10 = 120 watts each. So the ideal power used would be 240 watts for the two batteries. The AC source must supply power in the same way so you need 110 volts times I amps = 240 watts. Therefore the current, I, drawn would be 240/110 or around 2.2 amps , but you never have ideal energy exchanges because of heat loss and other things. So I would think you would need to have a source that could provide at least 5 amps @ 110 volts or around 600 watts at maximum usage. Much less current is needed for trickle charging.This gives you a margin of error of over 200% so should be OK. Hope this helps **Q: 2 engine start and one thee battery house set ...so i need a 5 bank charger?** A: Your description is not 100%, but it sounds like you need three Banks. One for each starting battery, and one for your group of house batteries, assuming they are all tied together. ## Frequently Bought Together - ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021 - Maradyne Havasu Hydronic Automotive Heater, 12V, 2-Speed, 20,000 BTU/Hr 177 CFM Under Dash Mount; 3-2.5" Louvers - Walker 35594 Exhaust Pipe Spout 1.625" Inlet (OD) 1.25" Outlet (ID) for Honda Accord --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/3433804-promariner-gen-3-prosport-20-amp-12-24-36-volt](https://www.desertcart.tn/products/3433804-promariner-gen-3-prosport-20-amp-12-24-36-volt) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-25*