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Paulo, owner of the sailboat Starry Night, installed a 15kWh lithium battery bank for approximately 1,000 euros by sourcing individual Grade A cells rather than purchasing pre-assembled marine-branded units.Watch He argues that marine-specific battery systems often carry significant price markups for components that can be assembled independently for a fraction of the cost.0:32 To build a custom bank, he recommends purchasing certified EV-grade cells and verifying their quality by scanning the QR codes found on the top of each unit to check manufacturer test data.5:11 He warns against cheap, uncertified batteries often sold on retail platforms, which frequently contain factory rejects with inconsistent internal resistance.5:36 For battery management, he utilizes a JK BMS, which supports active cell balancing and integrates with Victron systems via CAN or RS485 communication.4:05 This setup allows for remote monitoring of battery status on chart plotters and provides control over temperature-based charging and heating pads.4:58 Sourcing individual cells and selecting a compatible, user-serviceable BMS provides a cost-effective, transparent alternative to sealed, high-priced marine battery systems.

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