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Trojan

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Trojan is known for deep-cycle batteries built to be discharged and recharged day after day. That’s exactly what a trolling motor bank or a house bank asks of a battery. For boaters who prefer lead-acid, Trojan deep cycle batteries are a long-standing choice for durable, serviceable power.

The Trojan collection here includes 12V flooded deep-cycle marine batteries in Group 24, 27 and 30H sizes, along with Trojan’s 6V flooded deep-cycle batteries in GC2, GC2H, 902 and 903 footprints. Wired in pairs, those 6V batteries make heavy-duty 12V house and trolling banks. For a sealed, maintenance-free option, there’s the AES AGM line in 12V Group 24, 27 and 31 and in 6V sizes, plus a 12V 8D AGM dual-purpose battery for large boats that need big starting and house capacity in one case.

Product pages list Trojan’s published capacity, group size and weight. Lead-acid batteries are heavy, so check your compartment and mounting before you order. We ship nationwide and install anywhere from Venice to Gainesville, FL.

Voltage:6V12V24V36V48V

Choosing Trojan deep cycle batteries for your boat

Trolling motor banks

Trojan’s 12V deep-cycle batteries in Group 24, 27 and 30H sizes are a common choice for 12V, 24V and 36V trolling motor setups. For 24V, wire two identical 12V batteries in series; for 36V, wire three. See wiring a 24V or 36V trolling motor setup and Trolling Motor.

House banks

Many cruisers build house banks from 6V deep-cycle batteries wired in series pairs to make 12V. Add more pairs in parallel for more capacity. Trojan’s GC2, GC2H, 902 and 903 footprints give you options for different compartment sizes and capacity targets. Use house bank sizing for overnights to plan, and browse House Bank.

Large boats

The 8D AGM is a large-format 12V dual-purpose battery for boats with the space and the mounting to handle it. It’s very heavy, so plan installation carefully.

Flooded or AES AGM?

  • Flooded: traditional, serviceable and economical. It needs ventilation, upright mounting and regular watering with distilled water.
  • AES AGM: sealed and spill-proof, with no watering. It’s a good choice when the battery is hard to reach or ventilation is limited. Check the manufacturer’s mounting guidance.

Read AGM vs flooded maintenance for a practical comparison.

Getting the most from Trojan batteries

  • Use a charger set to the correct profile for flooded or AGM batteries. See Chargers.
  • Recharge promptly after every use; lead-acid shouldn’t sit discharged.
  • For flooded batteries, check electrolyte levels regularly and top up with distilled water after charging.
  • Keep terminals clean and protected. See saltwater corrosion prevention.
  • Equalize flooded batteries only when Trojan’s guidance and your charger call for it. Never equalize AGM batteries.
  • Keep batteries cool and ventilated, and maintain them in storage. See winter storage and Florida heat and battery life.

Weight and handling

Lead-acid deep cycle batteries are heavy, and the large 6V and 8D sizes can take two people or proper lifting gear to move safely. Plan the route into the compartment, use a battery carrier strap, and make sure your tray and hold-downs are rated for the weight. Anywhere from Venice to Gainesville, FL, our local team handles heavy installs.

Trojan FAQ

Are Trojan batteries good for starting an engine?

Most Trojan batteries here are deep-cycle batteries. The 8D AGM is dual purpose. For a dedicated starting battery, see Cranking.

Can I mix new and old Trojan batteries in one bank?

It’s best not to. Replace series and parallel banks as a matched set.

Should I choose 6V or 12V batteries for my house bank?

Either can work. 6V pairs are a classic deep-cycle choice; 12V batteries in parallel are simpler. Space and weight usually decide it.

Do you install Trojan batteries?

Yes, anywhere from Venice to Gainesville, FL. See local installation.

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