Great Loop Radio: Lithium Batteries: What Loopers Need to Know

What does it really take to replace a boat’s generator with lithium batteries, and can you cruise the Great Loop without relying on a generator? On this episode of Great Loop Radio, we’re joined by current Looper and AGLCA Admiral Sponsor Cathy Aull, who shares a how the failure of the generator aboard Aspasia, her Meridian 341, led her to rethink the boat’s entire power system. Rather than replacing the generator, Cathy designed and installed a 48-volt lithium battery system with an inverter, solar and alternator charging. She walks us through the research and calculations behind the conversion, how she determined which power demands were truly essential aboard, and the trade-offs involved—including why running air conditioning continuously wasn't one of her requirements. Cathy also shares what she has learned now that she’s actively cruising with the system: how she keeps her batteries charged underway and at anchor, how long she can comfortably stay off-grid, what she would do differently, the importance of properly sized wiring, fuses and other safety measures, and why a smaller generator or high-output alternator could still make sense as part of a lithium setup. If you're considering lithium batteries, trying to reduce generator use, or simply wondering what an alternative power setup could look like aboard a Great Loop boat, this episode offers a real-world look at one Looper's experience, from the initial decision and installation, to actually living with the system underway.