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SMA Sunnyboy Inverter Faults and Repairs

German inverter specialists SMA have been a leading manufacturer in renewable energy technologies for the last 35 years. Inverters come in a range of colours including red, blue and yellow. SMA Sunnyboy Inverters have been widely installed in the UK, some of the most popular being the SB1200, SB2000 and SB3000. High frequency models include the SB2000HF, SB2500HF, and SB3000HF. Transformerless models include the SB3000TL and the SB3600TL.

We have installed SMA equipment for our own clients for many years and we also have a lot of experience in working with their equipment for new clients on the support side. So if you would like help with diagnosing faults, carrying out servicing or repairs and or are currently without an installer then you will find us well qualified and pleased to help.

SMA Sunnyboy inverters have LCD displays on the front of the chassis, which providing it's working, will highlight any errors with the inverter or the solar PV system that it runs, some will show event numbers, others just a message. We have listed and described common faults with SMA Sunnyboy inverters and what action to take to resolve them below:

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Repair SMA Sunnyboy Inverter

 

 

Repair SMA Sunnyboy Inverter

 

 

Repair SMA Sunnyboy Inverter

SMA Sunnyboy Inverter Faults and Warnings:

Some of the advice we give related to identifying, confirming and or resolving some of the faults detailed below, starts with safely shutting down and restarting the inverter and the solar PV system. This is something that nearly all solar PV systems installed in the UK would have been designed to be carried out safely by the solar PV system owner. However, paperwork, schematics and manuals are not always clear or available, so if you have any concerns about how to do this, we will always be more than happy to talk you through the process over the telephone at no charge.

  • Event 1 - Grid Fault - The inverter is measuring a grid (mains) voltage or a grid impedence that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Event 2 - Grid Fault - The inverter is measuring a grid (mains) voltage or a grid impedence that is too low in relation to the parameters that the inverter has been set to safely operate within. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.
  • Event 3 - Grid Fault - The inverter has measured a 10 minute average grid (mains) voltage or a grid impedence that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Event 4 - Grid Fault - The inverter is no longer in grid parallel operation due to frequency fluctations from an unstable grid (mains) connection and has stopped feed‑in operation for safety reasons. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Event 5 - Grid Fault - The inverter is measuring a grid (mains) frequency that is either too high or too low in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Event 6 - Grid Fault - The internal monitoring function of the inverter has detected an excessively high proportion of direct current in the grid current. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Event 7 - Frq. not permitted - The inverter is measuring a power frequency outside the permissible range that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Event 8 - Waiting for grid voltage - Grid Failure - Check Fuse - The inverter understands that there has been a mains failure (a power cut). If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.
  • Event 9 - PE conn. missing - Check connection - The inverter understands that the protective earth connection is missing from the AC supply side. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or the supply circuit.
  • Event 10 - L / N swapped - Check connection - The inverter understands that the Live and Neutral connectors are swapped on the AC supply side. This fault is unlikely to occur in an existing installation that has previously worked correctly. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or the supply circuit.
  • Event 11 - Installation fault - Check connection - The inverter understands that either the Live and Neutral connectors are swapped on the AC supply side or the second phase has been connected to the Neutral on a three phase circuit. This fault is unlikely to occur in an existing installation that has previously worked correctly. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or the supply circuit.
  • Event 33 - Unstable operation - The inverter is measuring low DC voltage. Assuming that there is adequate sunlight, this is an existing installation that has been specified correctly, no changes near the installation area have been carried out and the system has operated before without problems, if this error persists then we would advise that the DC side of the system including and excluding the inverter is tested.
  • Event 34 - DC overvoltage - Disconnect generator - The inverter is measuring too much voltage from the panels. Assuming that this is an existing installation that has been specified correctly, hasn't recently been changed or added to and has operated before without problems. This could mean either a problem with the panels or with the inverter. We would advise that the DC side of the system is disconnected using either the built in DC isolator at the bottom of the inverter or the DC Isolator installed between the panels and the inverter (if available) and contact us to test the DC side of the system including and excluding the inverter.
  • Event 35 - Insulation resist - Check generator - This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.
  • Event 36 - High discharge curr. - Check generator - This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.
  • Event 37 - Resid.curr.too.high - Check generator - This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.
  • Event 38 - DC overcurrent - Check generator - The inverter is measuring too much current from the panels. Assuming that this is an existing installation that has been specified correctly, hasn't recently been changed or added to and has operated before without problems. This could mean either a problem with the panels or with the inverter. We would advise that the DC side of the system is disconnected using either the built in DC isolator at the bottom of the inverter or the DC Isolator installed between the panels and the inverter (if available) and contact us to test the DC side of the system including and excluding the inverter.
  • Event 39 - Waiting for DC start conditions - Start cond. not met - The inverter is measuring low DC voltage. Assuming that there is adequate sunlight, this is an existing installation that has been specified correctly, no changes near the installation area have been carried out and the system has operated before without problems, then if this fault persists, we would advise that the DC side of the system including and excluding the inverter is tested.
  • Event 60 - Self diagnosis - Interference device - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 61 - Self diagnosis - Interference device - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 62 - Self diagnosis - Interference device - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 63 - Self diagnosis - Interference device - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 64 - Self diagnosis - Interference device - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 65 - Self diagnosis - Overtemperature - The ambient temperature around the inverter is too hot. This could be due to a number of factors, for example 1) If the inverter is exposed to direct sunlight 2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate 3) The inverters components are getting too hot due to an internal component fault. If the unit isn't running hot and if after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 66 - Self diagnosis - Overload - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 67 - Comm. disturbed - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 68 - Self diagnosis - Input A defective - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 69 - Self diagnosis - Input B defective - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 70 - Sensor fault fan permanently on - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 71 - Various messages - There are various messages that can be present alongside an Event 71 fault code. These are mostly related to the SD card and firmware. Contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.
  • Event 72 - Data stor. not poss. - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 73 - Various messages - There are various messages that can be present alongside an Event 73 fault code. These are mostly related to internal components that are showing errors but the errors aren't serious enough to prevent grid feed in. Contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.
  • Event 74 - Varistor defective - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 75 - Fan fault - Clean fan - The temperature inside the inverter is too hot which the inverter understands is due to dust, fluff or a similar obstruction blocking the vents or fans inside the chassis. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 77 - Self diagnosis - Interference device - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 80 - Derating occurred - The inverter has measuring a temperature for more than 10 minutes that is too hot and has reduced power output to protect itself. This could be due to a number of factors, for example 1) If the inverter is exposed to direct sunlight 2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate 3) The inverters components are getting too hot due to an internal component fault. If the unit isn't running hot and if after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 81 - Comm. disturbed - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Event 90 - Various messages - There are various messages that can be present alongside an Event 90 fault code. These are mostly related to the initial setup at installation so should not be present on an existing system. If after the system has been safely shutdown and restarted this condition persists then contact us with the exact message as displayed on the screen to discuss what these issues might be and how they can be resolved.
  • We are familiar and comfortable in working with these units, please let us know if there is anything that we can help with with regards to error codes and faults, repairs, specifying replacements and or if you have any performance or safety concerns.

 

What Our Customers Say:

"We had been let down by a failure on our system,and the manufacturer of the part was no longer trading. We called Glen during the afternoon and he was there in the evening. He examined the system and recommended a replacement manufacterer, promising to come back and fit in the new part once it arrived. We informed Glen of the arrival on a Friday PM, he was there fitting the new part by 10:30 on the following Monday. Of course it worked. That is what you call service, and guess who is looking after all our requirements in the future. Highly recommend this company." - Gill Spencer, Newbury

Recomendation via Facebook

"We were very relieved to find Glen when our Solar Panel system stopped working, as our original supplier had gone out of business. We cannot praise Glen's persistence enough as he thoroughly reviewed the system to identify the faults and repair it, despite the searing heat of last summer. He also talked to Solar Edge and provided fault data to enable us to get a replacement part under warranty. Many thanks Glen for getting us up and running again!" - Jane Pearce, Highworth

Recomendation via Facebook

"Glen was very helpful and very reasonably priced. I would recommend him, and use him again in future if I need any solar work." Venu Jega, Highworth

Review via Google

"Outstanding. Conscientious, thorough, friendly and reasonably priced service. Highly recommended. Made our solar panel battery system safe, correcting the sub-standard work of others. Will always use this trustworthy PV electrician. Even after the work was completed, he studied the manual for our system and assisted with resolving further problems. Thanks Glen." Rob Barnes, Royal Wootton Bassett

Review via Cylex

"Very decent with a helpful attitude and expert in the technical side and reliable too. Had to integrate with our roofers to use their scaffolding before and after their work to take down and reinstall our PV panels. Helpful scheduling. Up and running again to our satisfaction at a decent price." David Ballard, Ramsbury

Recomendation via Facebook

"Our inverter failed and as our installer had gone out of business did not know what to do. Contacted Glen who was brilliant. Came out checked the failure dealt with the manufacturer and all aspects of the warranty claim.New inverter received under warranty and Glen came out and fitted the new one straightaway. Superb service from a very professional and helpful person. Highly recommend this company." Martin Brailey, Wokingham

Recomendation via Facebook

"My inverter failed and Glen very quickly got my system up and running again. He was very professional but explained everything to me. Many thanks Glen and I've already recommended him." Di Foxwell, Wroughton

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"New meter doing the business nicely. Good job, great service and friendly with it. Our thanks." Richard Illsley, Marlborough

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