A practical 12V 40Ah AGM deep cycle battery for compact solar, caravan, camping, marine, mobility and auxiliary-power systems. With approximately 480Wh of nominal stored energy, this size is well suited to lighter 12V loads and installations where space, weight and simplicity matter.

Ideal for Compact 12V Power Systems

The 40Ah capacity is a sensible option for low-to-moderate energy requirements such as LED lighting, small 12V accessories, device charging, selected pumps, communications equipment and backup-power applications. It can also be paired with a correctly sized solar panel and charge controller for small off-grid setups.

Key Features

• 12V nominal voltage
• 40Ah rated capacity
• Approx. 480Wh nominal energy
• Sealed AGM lead-acid construction
• Low-maintenance deep-cycle design
• Suitable for solar, caravan, camping, marine and auxiliary use
• 12-month warranty

Charging & Battery Care

Use a charger, solar regulator or DC-DC charger with a compatible AGM charging profile. Charging voltage and current limits should follow the battery label and supplied specifications. Avoid routinely discharging an AGM battery to 100% depth of discharge if long service life is the priority.

Choosing the Right Capacity

Battery runtime depends on the connected load, discharge rate, temperature, battery condition, cable losses and system efficiency. The 480Wh figure is nominal energy rather than guaranteed usable output. For inverter-powered appliances, allow for inverter losses and confirm that the battery, cabling and protection are suitable for the expected current.

Need help sizing a solar and battery system? StarPower Advance Solar Technology can help match this 40Ah AGM battery with a suitable solar panel, MPPT or PWM charge controller, DC-DC charger and inverter.