17 Responses

  1. Dear Mr Christian Höhle

    We have fuel save controller (Sr:1901100058)for 991.9 Kw plant at Kaysalt in Kenya. We would like a FTP dump from your FSC to our local FTP server. Would it be possible to have a dump of major parameters like voltage and current for all the three (Pv plant/Grid/Genset)?


    • avatar Christian Höhle says:

      Dear Jayesh,

      currently the logfiles you can download via FTP just contain power.

      We are working on an extended logging function that will – just like the configurable SCADA interface – provide means to specify which values of which device should be logged. It is scheduled to be contained in Release 8 (Software 2.08) by the end of this year. With being able to configure what is logged, you could even log PV as a whole and each inverter additionally in the same file. Furthermore, if you would employ more than one generator, you could also add each generator seperately.

      I hope this answers your question. If you need more information, please let me know.

      Sunny regards,

      • avatar jayesh vekaria says:

        Thanks you for your response

        Would FCS be able to log power for all the three Sources ? And if yes, Would it also be log data at night when the Pv does not produce?

        If this is possible, what are the steps do we need to take to have this done?

        Please advice


      • avatar Christian Höhle says:

        Dear Jayesh,

        the Fuel Save Controller logs the following values in a 10s resolution:

        – Generator power (active / reactive)
        – Generator reserve power setpoint (for genset controllers that support this: currently Woodward Easygen 3000 series and ComAp InteliGen / InteliSys NTC with hybrid firmware)
        – Solar power (active / reactive)
        – Solar power available (uncurtailed possible power if meteo device attached)
        – Solar power setpoint (active / reactive)
        – Grid power (active / reactive)
        – Grid Frequency
        – Grid line to line voltage
        – Battery power (active / reactive)
        – Battery power setpoint (active / reactive)
        – Load power (active / reactive)

        These data is also collected at night. You can easily use an ftp client of your choice, log in as “User” (careful: case sensitive) with your selected password and download the logfiles from folder /cfc0/fsc/log/DataFast.

        You can then easily open the logs that are stored in csv format for example in MS Excel.
        With a little excel magic, you can easily use it for graphical evaluation of the plant’s performance:
        Diagram from FSC logfile

        I hope this answers your question. Let me know if further questions come up.

        Sunny regards,

  2. avatar Ammar says:

    Dear Mr. Christian,
    Thank you very much for the article.
    I have some questions and I will be very grateful if you can help me..
    1- Is it possible to use the fuel save controller for PV size below than 30 kWp? And what is the rough guess price for it?
    2- What is the minimum number of genset that I can connect it to the FSC ( is it possible to use ONE diesel generator?)

    Thank you in advance and I appreciate your cooperation with me.

    Best regards,

    • avatar Christian Höhle says:

      Dear Ammar,

      technically it is possible to use the Fuel Save Controller with a PV size below 30kWp and with one generator.
      At the moment, our smallest FSC is the S-Model which is available at 6000 €.

      Sunny regards,

  3. avatar Cele nwaokobia says:

    Do you have representatives in Nigeria? Power cut in Nigeria is endemic. Your services will be invaluable here.


  4. Thanks, You wrote awesome, I have learn lots of things from your article. It’s really helpful for any readers.

  5. avatar Başar Onur Mesci says:

    Dear Christian thank you very much for the article.
    We installed a SMA Zero Export system at Formula 1 Istanbul in 2016. The installed capacity is 40 kwe.
    Is it possible to entegrate SMA Fuel Safe with SMA Cluster Controller and SMA Energy Meter?

    Thank you in advance.

    Başar Onur Mesci

    • avatar Christian Höhle says:

      Hi Başar,

      the Fuel Save Controller can not be used together with a cluster controller to control the solar plant, as the systems would compete for the control of the system.

      But the Fuel Save Controller can take over control. The cluster controller then has to be configured not to control the solar inverters. It still can be used to upload the plants data to Sunny Portal if needed.

      The energy meter is a bit too slow for fuel save controller operation. You would use the measurement system included in the FSC-20 and connect it to loads and generator.

      The FSC-20 can be configured to zero export so that grid requirements are met.

      So you could change the system to a Fuel Save Solution, but it would require some wiring to be done.

      Sunny regards,

      • Dear Christian, thank you very much for your prompt and clear response.

        We are looking forward to install the new SMA Fuel Save Controller in our forthcoming projects, especially in Island Systems.

        Thank you very much again.

        Sunny and windy regards,
        B.O. Mesci

  6. avatar mansour alramlawi says:

    Dear Mr.Christian Höhle,

    I have a factory in Palestine, Gaza city. we have the problem of unstable power supply from the public grid. Now we are thinking to install PV-diesel generator system from SMA to over come this problem. This the basic information I have

    Area size: up to 50 Kwp solar panels.
    Installed generator capacity: 120 Kva
    Max. Load: 110 Kva.
    Daily blackout period:10 hours.

    What is your recommendation, for this project?

    Your fast Response is highly appreciated,

    Best Regards

    • avatar Christian Höhle says:

      Dear Mansour,

      wow – 10h per day of blackout is really severe. Of course, a genset combined with solar power would help a lot.

      Concerning your project, our Fuel Save Solution is built exactly for this situation.
      In case of a blackout, an automatic transfer switch would disconnect the outer grid and the backup generator could start and provide a grid in which the solar system feeds in. The challenge with and adding solar to a genset-based grid is to prevent solar energy from being pushed into the generator – this is one of the most important jobs of the FSC-20. It controls the solar inverters power production to guarantee a safe system operation.

      In case of the external grid returns, the automatic transfer switch connects the external grid. This is detected by the FSC-20 and depending on the grid regulations, the FSC-20 reduces solar production if feedin limits apply or feeds excess power into the external grid. You have to clarify the general conditions with your grid utility.

      So technically this would definitely work.
      I noticed your email as well. We will get in contact with you to clarify the details for an offer.

      We have a design tool called “Sunny Design” that is able to design Solar-Diesel-Hybrid-Plants as well. If you like, give it a try. You can find a short howto here.

      Sunny regards,

  7. avatar Vincent says:

    Hi Christian,
    We have a PV project 50kWp use 2pcs STP 25000 tl-30 in building’s rooftop.
    The genset is larger capacity than this PV system. But when grid is lost, after that the genset start up.
    Can The STP 25000 tl-30 synchronize with genset to feed power load?
    In this case FSC-20 can control these devices. How I can connect this this system?
    Should we need more device?

    Many thanks.

    Best regards,

    • avatar Christian Höhle says:

      Hi Vincent,

      Yes, just like the inverters can feed into the external grid, they can also feed into a Genset grid as long as the grid quality is sufficient (frequency and voltage do not leave the limits set for your grid).

      The FSC-20 can control these inverters. You would use the FSC-20 and connect the measurement of voltage (direct connection) and current (via current transformer) on your genset and load. The connection to the inverters is via Ethernet. The FSC-20 then can control the solar inverters to maximize solar share but keeping the genset under safe conditions.

      Sunny regards,

  8. avatar Thinus says:

    Hi can you please send me full information and prices please

    • avatar Christian Höhle says:

      Hi Thinus,

      the pricing depends on the needs for your project as there are different variants of the FSC-20 that address different complexities.

      As a rough guess, the Fuel Save Controller Price for systems with a PV size between 500kWp and 1MWp is €10 to €20 per kWp additional to the PV system costs.

      For full information and a pricing indication, please just send a description of your project to FuelSaveSolution@sma.de so that my colleagues can suggest a setup for your project.

      Sunny regards,

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