AL08
SDMO
High DC Battery Voltage
The controller indicates AL08 (battery high voltage); the DC voltage reading is above the normal range.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Overcharging due to a faulty battery charger, incorrect charger voltage setting for the SDMO system, poor battery condition causing unstable voltage, or loose battery sense wiring.
How to Fix / Troubleshooting
Safety first: Turn the generator OFF and disconnect the battery charger AC input before working on DC circuits.
- Verify charger settings: Check that the SDMO battery charger is configured for the correct system voltage (12 V or 24 V). Incorrect settings can cause overvoltage.
- Measure charger output: With the charger powered, measure the DC output at its terminals. If the voltage exceeds manufacturer limits (typically >14.4 V for 12 V or >28.8 V for 24 V), replace the charger.
- Inspect sense wiring: Some SDMO chargers use remote sense leads. Ensure these are correctly connected and not open-circuit, which can cause overcharging.
- Check battery condition: Swollen cases or excessive gassing indicate damage from overcharge. Replace affected batteries and ensure proper ventilation.
- Reset alarm: After correcting the cause, clear AL08 and monitor the DC voltage over several hours.
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Repair Difficulty
Medium
3/5
Required Part
Battery Charger Module
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