Trojan T-105 Deep Cycle Battery

The Trojan T-105 remains a benchmark 6V deep cycle battery for RVers and solar off-gridders who want reliable, cost-effective power storage and don't mind routine maintenance.

4.5

HitchHaven score4.5 out of 5 · our editorial rating

6V flooded lead-acid deep cycle design
225Ah capacity at 20-hour rate
Thick lead-alloy plates for long cycle life
Reinforced polypropylene case for vibration resistance
Designed for RV, solar, and off-grid battery banks

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Overview Specs Pros & cons Full review Related

The verdict

The Trojan T-105 remains a benchmark 6V deep cycle battery for RVers and solar off-gridders who want reliable, cost-effective power storage and don't mind routine maintenance. While heavier and less convenient than lithium options, its durability and performance in deep discharge cycles make it a trusted workhorse for campers building a dependable battery bank.

Spec plate

Voltage: 6V
Capacity: 225Ah (20-hr rate)
Weight: 62 lbs (28 kg)
Battery Type: Flooded Lead-Acid
Cycle Life: Up to 1,500 cycles at 50% DOD

Pros & cons

What we like

Long proven track record in solar and RV applications
Deep discharge recovery without major capacity loss
Widely available replacement parts and support
Good value per amp-hour compared to AGM/lithium
Rugged construction handles rough road vibration

What to watch

Requires regular watering and maintenance
Heavy, making installation and handling difficult
Flooded design requires ventilation to avoid gas buildup
Lower energy density than lithium alternatives
Terminals can corrode if not cleaned periodically

Full review

The Trojan T-105 deep cycle battery has long been a trusted name among RV owners and off-grid camping enthusiasts who need dependable, long-lasting power for their adventures. This 6-volt flooded lead-acid battery is built with thick lead plates and a robust construction designed to withstand the repeated deep discharge and recharge cycles that come with powering refrigerators, lighting, water pumps, and other essential systems in a recreational vehicle or camper. With a nominal capacity of 225 amp-hours, the T-105 is often paired in pairs or larger banks wired in series to deliver the 12-volt or higher output most RV electrical systems require, making it a popular choice for those building or upgrading a house battery bank.

What sets the Trojan T-105 apart in the solar and electrical space is its proven track record for durability and consistent performance over thousands of charge cycles when properly maintained. RVers who pair this battery with a solar charging setup appreciate its ability to handle the irregular charging patterns typical of solar power, accepting charge efficiently from panels and controllers while still delivering steady, reliable power during overnight stays or extended boondocking trips. The battery's deep cycle design means it can be drawn down significantly more than a standard starting battery without suffering permanent damage, which is crucial for camper owners who rely on stored energy to run appliances, charge devices, and keep lights on when shore power or generator access isn't available.

Installation and upkeep of the T-105 are straightforward for anyone familiar with basic RV electrical systems, though as a flooded battery it does require periodic maintenance such as checking and topping off electrolyte levels with distilled water to ensure optimal performance and longevity. Its rugged case and heavy-duty terminals are built to endure the vibration and movement associated with travel, making it a solid fit for the demands of life on the road. For RV and camper owners seeking a dependable, field-tested deep cycle battery to anchor their solar and electrical setup, the Trojan T-105 remains a go-to option that balances capacity, resilience, and long-term value.

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