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This a possible failure of the voltage detection circuit in the inverter main board and requires the fault be identified by checking the voltage/current feed/limiter to the battery. Once when the battery voltage has reached the threshold set up the charging should stop and then the circuit will analyse the voltage on the board to trigger the charging to be put ON. This can be a failure of the detection circuit and if not checked can damage the battery.
There are numerous fuses (rectifier, inverter, charger, battery) on the 9135 that are located internal to the unit and not readily accessible to the user. Generally a blown fuse is accompanied by another component failure which caused the fuse to blow in the first place. As a result, additional troubleshooting and testing is usually required to identify the root cause of the failure. This of course leads to soliciting the services of a technician who has access to the schematics, test equipment, and parts to initiate a repair. Without the schematics, it's like working in the dark. For complete support, please contact Eaton (Eaton bought Powerware so now it's the Eaton 9135):
there be an internal fuse or reset button on or close to circuit board, you'll have to open it up to get at curcuit board, make sure you have power at wall receptical, cord isn't bad, unplug when you open it, be safe