Your FUV’s On-Board-Charger and Cooling System

Your FUV’s on-board charger (OBC) can stop working and cause some grief. Here are some indications your OBC is not working:

1. The screen comes on, you can drive the vehicle, but when you plug in the EVSE “charger,” the FUV charging bar on the display doesn’t move left to right within a minute and the state of charge (SOC) percent doesn’t increase after several minutes (10 or more).

2. You try more than one charger and the SOC still doesn’t increase.

3. When charging, you hear a pop in the front of the vehicle and it stops charging.

4. When charging, it only increases the SOC about 1% per many hours (super slow trickle charge).

5. The breaker your EVSE is connected to flips.

One person found that their OBC overheated from not having enough coolant. To ensure you have enough coolant, check the reservoir under the hood on the left side of the FUV. It takes a glycol mix. See the FUV Owner’s Guide. The manual does talk of checking the coolant but there is no description of where to do this. There also is no indication on the reservoir for full or add level.

The coolant cools the inverters and the on-board charger. The batteries are not liquid cooled. The coolant reservoir is not under pressure. It is vented to atmosphere, so this system should never get anywhere near boiling point.

There are no external temp sensors, just the modules reporting temps. The only way a person could capture info from the module is via the BMS  module with standard CAN communication.

When the inverters or the OBC start getting hot, the first stage cooling is a pump to circulate the coolant, the second stage brings on the fan to assist with dissipating the heat. The fan coming on when charging is just to keep the OBC cool.



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