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Long Beach Marine Electric connects owners with licensed, insured marine electricians for Duffy electric boat repair: replacing tired battery packs, diagnosing chargers and controllers, and repairing motor and throttle wiring. Duffy boats began in Newport Beach. The company's founder built the first prototype in 1966, and an OCBJ report counted about 2,200 Duffys in Newport Beach alone. Their quiet, simple electric drives depend almost entirely on a healthy battery pack and charger.
What happens on the first visit
- Pack voltage at rest and under load, then each battery tested individually. One weak battery drags the whole pack down.
- Charger check on shore power: is it delivering current, and does it finish the charge cycle?
- Inspection of the pack interconnect cables and terminals, where corrosion and loose connections cause heat and voltage drop.
- Controller, throttle and motor wiring check if the boat runs poorly, not just briefly.
- A written finding and a fixed price, with options for lead-acid or lithium replacement packs.
Why electric boats lose range
Duffy's own guidance puts typical battery-pack life at over 800 cycles with proper maintenance, and as many as about 1,200. Packs fail for the same reasons as any lead-acid bank: age, chronic undercharging, low electrolyte in flooded batteries, and one weak battery in a series pack pulling the others down. A boat that used to cruise the harbor all afternoon and now needs charging after an hour usually has a tired pack or a charger that no longer finishes its cycle. Duffy says a full charge typically takes about 12 hours.
Pack replacement: like-for-like or lithium
A like-for-like lead-acid pack is the lowest-cost fix and keeps the boat's existing charger and controller settings. A lithium pack cuts weight substantially, holds voltage better through the run and lasts many more cycles, but the charger, and sometimes the controller, must be set up for it. Either way, the whole pack is replaced together and the interconnects renewed. See lithium conversion for how lithium systems are designed.
Chargers, controllers and wiring
Electric harbor boats sit plugged in for long periods, so the onboard charger is working constantly. Chargers fail, and some older units never finish a full charge, which slowly sulfates the batteries. Motor controllers and throttle wiring fail less often, but corrosion at connectors in the bilge and stern compartment is common in salt water. Most diagnosis and pack work is done at the dock.
Insurance, warranty and who pays
Electric boat repairs are owner-paid, or billed to the rental or fleet operator. Pack diagnosis usually takes about an hour. A pack replacement is priced in writing with the batteries, interconnects and labor itemized before work starts.
What's included
- Pack and individual battery testing
- Battery pack replacement
- Interconnect cable renewal
- Charger diagnosis and replacement
- Lithium pack upgrade option
- Controller and throttle wiring check
- Motor connection inspection
- Fleet and rental service
DIY vs cheap fix vs proper electric boat repair
| Factor | DIY | Cheap operator | Proper marine work |
|---|---|---|---|
| Diagnosis | Replace the charger | Replace the worst battery | Every battery tested under load |
| Pack | Mixed old and new | Partial replacement | Full matched pack |
| Interconnects | Reused | Reused | Renewed with sealed terminals |
| Charger | Not checked | Not checked | Full cycle verified, profile matched |
| Result | Short range continues | Range fades again | Range restored and verified |