Why Won’t My MEAN WELL Battery Charger Turn Off?
We were contacted by a customer, who had a MEAN WELL battery charger in his caravan.
After replacing the batteries, he found that the charger was constantly running and wanted to know why it wasn’t shutting off.
MEAN WELL battery chargers are usually set to three-stage mode when charging lead-acid batteries in a caravan, two-stage for Lithium-ion batteries.
The battery charger's fan will run continuously.
It will run fast if the charger is running in boost mode and will slow down when (and if) it goes into float mode.
The charger will start up and check the state of charge of the battery. If the battery is down on charge, it will go into boost mode and the fan will run fast. It should drop back to float mode after a while, depending on how much charge the batteries need.
If the batteries are flat, it will take quite a while. Also, if the fridge kicks in, or the lights are turned on, the charger will see this extra load and stay in boost mode, so the fan will run flat out.
If the load is still drawing power after 24 hours, the charger will drop back to float mode and stay there until the next time the power is cycled.
When the battery charger is in boost mode, the LED indicator will be orange. When it drops back to float mode, the LED indicator will be green. Once the charger is in float mode, it will stay there until the power is cycled.
So long as you are getting these colours on your battery charger’s LED indicator, you know the battery charger is working correctly.
If you have any questions about using MEAN WELL battery chargers, please contact Power Supplies Australia.
