Bosch BPT-S Solar Inverter faults and operational manual
Bosch entered the solar market with the manufacture of premium solar panels. In 2013 they stopped manufacturing solar panels and entered the solar market again with their Bosch BPT-S string inverters. There were flaws in these inverters as they were not as efficient for Australian conditions as they were for European conditions. In January 2016, Bosch discontinued their manufacture. These inverters came with the standard 5 year warranty. Warranty claims are being honoured by Bosch.
If you experience an issue on a Bosch Solar Inverter, the manual shutdown procedure is useful in fixing some errors. There are also other faults that require other procedures.
Bosch BPT-S solar Inverter operation manual and data sheet
Bosch Operator Manual
Bosch BPT-S Data Sheet 3-4.6kW
For convenience, we have put together a list of error messages, possible causes and remedies.
| Fault message | LED status indicator | Possible cause | Possible fault rectification |
|---|---|---|---|
| TEMP LIMITS | Top LED red | Ambient temperature is outside the temperature limits |
Check the installation conditions |
| DC VOLTAGE | Left LED red | Solar power system field designed or connected incorrectly |
Check the voltage of the solar power system field |
| AC CONNECTION | Right LED red | Faulty grid connection | Check installation and connector pin assignment |
| Mains plug installed incorrectly, (L and N interchanged) |
|||
| Wrong grid type | Check grid type | ||
| Protective earth (PE) not connected correctly |
|||
| Mains plug installed incorrectly (L, N or PE interchanged) |
Check installation and connector pin assignment |
||
| AC CONNECTION PE | Right LED red | Faulty grid connection | Check installation and connector pin assignment |
| Faulty PE connection | |||
| Wrong grid type | Check grid type | ||
| Protective earth (PE) not connected correctly |
|||
| GRID FREQUENCY | Right LED red | Grid frequency is outside tolerance |
Check grid frequency, if necessary contact the grid operator |
| AC VOLTAGE | Right LED red | AC surge voltage | Check voltage, if necessary contact the grid operator |
| AC voltage is too low | Check voltage, if necessary contact the grid operator |
||
| Mains plug installed incorrectly |
Check installation and connector pin assignment |
||
| Grid impedance is too high |
Reduce the length of the AC cable or increase the AC cable cross-section |
||
| FIRMWARE | Top LED red | Incorrect firmware due to wrong firmware updates |
Perform firmware update again. During the firmware update, do not disconnect the string inverter from the grid or the Internet/ computer. |
| INT ELECTRONICS | All LEDs permanently red |
Faulty electronics | Contact Bosch Power Tec Service or your solar system installer |
| COM FAULT | Bottom LED red | Communication fault | Check connected accessories and internet connection |
| DC OVERVOLTAGE | All LEDs are flashing red |
Overvoltage | – Do not touch the device – Switch off the AC fuse – If DC circuit breaker is available within the installation, set the DC circuit breaker to 0 (=off). – Contact Bosch Power Tec Service or your solar system installer |
| SERVICE SWITCH | All LEDs are flashing red |
Internal defect | – Do not touch the device – Switch off the AC fuse – If DC circuit breaker is available within the installation, set the DC circuit breaker to 0 (=off). – Contact Bosch Power Tec Service or your solar system installer |
| DC ISOLATION | All LEDs are flashing red |
– Short circuit – Earth fault |
– Do not touch the device – Switch off the AC fuse – If DC circuit breaker is available within the installation, set the DC circuit breaker to 0 (=off). – Contact Bosch Power Tec Service or your solar system installer |
If you need more information, the full details are available in the Bosch Solar Inverter manual’s Troubleshooting section. Check if your Bosch Solar Inverter is still within the warranty period so you can contact the equipment installer or supplier for repair if the error continues. If your inverter is outside the warranty period we suggest that you contact a professional solar power expert. If you’re in the Gold Coast or Brisbane area, contact Gold Coast Power Solutions and we will be in touch to provide you with further assistance.
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