The marine battery market is undergoing a significant technology transition. AGM (Absorbent Glass Mat) batteries are rapidly replacing flooded lead acid batteries in both starting and house bank applications on boats worldwide.
Why Flooded Batteries Are Declining in Marine Use
Flooded lead acid batteries have been the marine standard for decades, but their drawbacks are increasingly unacceptable in modern boat electrical systems: they require upright installation, regular watering maintenance, and vent gases during charging — problematic in enclosed boat compartments.
AGM Advantages for Marine Applications
- Sealed and spill-proof: No electrolyte leakage even if the battery case cracks — critical for mobile marine environments
- Install in any orientation: Enables under-bench, side-mount, and space-efficient installations
- Vibration resistance: Glass mat construction absorbs wave-action and engine vibration
- Low self-discharge: 1-3%/month — ideal for seasonal boats stored over winter
- No gassing: Minimal hydrogen release allows installation in living spaces without dedicated ventilation
Marine Battery Types: Starting vs House vs Dual-Purpose
Starting batteries: High CCA (Cold Cranking Amps) for engine starting. Thin plates maximize surface area for short high-current bursts. Not suitable for deep cycling.
House batteries: Deep cycle design with thick plates for repeated discharging. The correct choice for powering all onboard electrical systems (lights, refrigeration, electronics, windlasses).
Dual-purpose: Compromise between starting and house — suitable for smaller boats with simple electrical systems.
Sizing a Marine House Battery Bank
Size the house bank to run all loads for 2-3 days without recharging, with no more than 50% DoD on any given day. A typical formula: Total daily Ah consumption / 0.5 (50% DoD) x 3 days = minimum house bank capacity.
For marine battery specifications: sales@chisen.cn
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