Generator shuts down; controller displays E12 High Battery Voltage.

Safety first: Turn off the battery charger AC supply before working on DC wiring. Wear eye protection around batteries.

• Measure battery voltage: With a multimeter, check DC voltage at the battery terminals. For a 12 V system, it should typically be 13.5–14.4 V when charging; for 24 V, 27–28.8 V.
• Inspect charger settings: On the Aksa‑supplied charger, verify the nominal voltage (12/24 V) and charge mode are correctly set.
• Check battery connections: Tighten loose terminals and clean corrosion with a baking soda solution. Ensure sense wires (if used) are firmly attached.
• Test charger output: If voltage is above recommended limits, disconnect the charger from the battery and measure its open‑circuit output. Replace the charger if it is out of specification.
• Battery condition: If voltage spikes occur only with a particular battery, have the battery load‑tested and replace if faulty.