ePropulsion E06 — Low Battery Voltage Under Load
General · EP-E06
Root Cause
Battery voltage dropped too low during motor operation. Under load, internal resistance causes voltage sag. After lay-up, cell imbalance or degradation can cause voltage to collapse under load even when resting SOC appears adequate. River or sandy water ingress can accelerate seal and bearing wear, increasing mechanical drag and load current.
Symptoms
Conditions
- ePropulsion Evo or Navy 6.0 or Navy 3.0 motor
- battery voltage collapses under load
- may occur at apparently adequate SOC if battery degraded or load increased
- lay-up period increases risk — seals dry out, pod fouling accumulates
- river or sandy water deployment increases fouling and wear rate
Solution
Reduce throttle immediately to lowest usable setting to allow voltage to recover. Charge battery as soon as possible. If fault occurs at low SOC, charge fully before next use. If fault occurs at high SOC (above 70%), suspect battery degradation, cell imbalance, or increased mechanical drag from fouling — inspect motor pod and seals.
Actions
- Reduce throttle to minimum immediately
- Switch to diesel or alternative propulsion if available
- Monitor battery voltage — if recovery is slow, return to dock
- Charge battery fully before next use
- If fault recurs at high SOC, inspect motor pod for fouling and seal condition
- Run motor at low power for 15 minutes monthly to prevent pod fouling and seal degradation
- After river or sandy water operation, flush motor pod with clean water
- If lay-up exceeded 3 months, perform full motor inspection before extended use
- Contact ePropulsion dealer if fault persists after full charge
