Alternator Overheating After a Lithium Conversion
Understand why alternators can overheat charging LiFePO4 banks and how current limiting, temperature sensing and regulation help.
Symptoms can include hot-alternator smell, belt dust, belt squeal, falling output, regulator shutdown, excessive case temperature and repeated alternator failure.
A large depleted lithium bank can accept high current for an extended period.
Investigate DC-DC current limiting, alternator temperature sensing, external regulation, a larger alternator, improved belt system, reduced charge current, better ventilation and more solar.
Diagnose before replacing parts
A shutdown or low-output symptom can begin in the battery, charging source, protection, cable path, monitor configuration or the load itself. Record evidence before resetting equipment so the original cause is not lost.
- Capture alarms, BMS history, state of charge, voltage at the battery and voltage at the affected equipment.
- Inspect for heat, looseness, corrosion, damage or water ingress before attempting another high-current test.
- Stop and isolate the system if there is swelling, unusual heat, odour, smoke, damaged cabling or repeated protection operation.