The Victron Energy 12V 90Ah AGM Deep Cycle Battery is a sealed, maintenance-free lead-acid battery rated at C20 capacity. It suits cyclic applications in solar, off-grid, marine and backup power systems where reliable deep discharge performance matters.

Key features of this deep cycle battery

• Capacity, 90Ah rated at C20 discharge rate, suitable for deep cycle use.
• Construction, Absorbed Glass Mat (AGM), sealed, spill-proof and maintenance-free.
• Voltage, 12V nominal, compatible with standard 12V system architectures.
• Self-discharge, low rate, suitable for seasonal or standby applications.
• Gas emission, recombinant technology minimises gas emission during normal operation, allowing installation in enclosed spaces.
• Weight, 22.5 kg, reflecting the lead content of genuine deep cycle construction.

Product overview

AGM deep cycle batteries differ from standard starter batteries in plate thickness and active material density. This range uses thicker plates and higher paste density to deliver sustained energy over a longer discharge period rather than a short burst of current. That makes it appropriate for solar storage, inverter backup and off-grid use where the battery is regularly discharged to 50% or below.

The AGM separator holds the electrolyte against the plates, eliminating free liquid. The battery can be mounted in any orientation except inverted, and does not need ventilation for acid fumes under normal conditions. It remains a lead-acid chemistry, though, and should be charged with a compatible multi-stage charger set to AGM parameters. Overcharging or undercharging will shorten service life.

At 22.5 kg this is at the upper end of what one person can safely handle, so plan access and fixing arrangements before installing. Multiple units can be connected in parallel or series provided all batteries are the same type, age and state of charge at the time of connection.

Applications

• Solar PV off-grid storage systems with 12V or 24V battery banks.
• Inverter backup power for domestic or light commercial premises.
• Marine house battery banks for lighting, navigation and auxiliary loads.
• Motorhome and campervan leisure battery installations.
• Telecoms and UPS standby power applications.
• Remote monitoring stations and rural off-grid installations.

What's in the box

• 1 x Victron Energy 12V 90Ah AGM Deep Cycle Battery

Installation notes

Install and commission with a qualified electrician or competent person familiar with lead-acid systems. Configure the charger or charge controller for AGM chemistry with the correct absorption and float voltages. Secure the battery against movement, particularly in marine or vehicle installations, and confirm any enclosed space meets minimum safety requirements before fitting. Dispose of used batteries through an approved recycling scheme under UK WEEE and battery regulations.