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Upgrading a 35-foot monohull’s electrical system from lead-acid to lithium requires replacing a traditional 1-2-off battery switch with a DC-to-DC charger to protect the engine alternator.3:21 While four 6-volt Trojan T105 golf cart batteries previously provided 225 usable amp hours for $1,000, a single 300-amp-hour LiTime lithium battery now offers 240 usable amp hours for the same price at a fraction of the weight.5:18 The engine start battery should remain a sealed lead-acid unit, such as an Optima 6-pack, to maintain compatibility with the alternator.4:22 For monitoring, a Bluetooth shunt paired with a smartphone app replaces the need for a dedicated hard-wired display screen.6:52 A balanced system for a high-power-demand vessel includes 1,000 watts of solar capacity and 600 amp hours of lithium storage.7:49 Lithium batteries allow for an 80% depth of discharge, significantly increasing usable capacity compared to the 50% limit of lead-acid banks.5:11

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