Resetting the STP X 12/15/20/25 inverter

With a 'reset' (turning off and on) of the Sunny Tripower inverter, the data transmission can be easily restored. Read here which steps you need to take.

How to reset an SMA Sunny Tripower X inverter

Resetting the STP X 12, 15, 20, or 25-50 inverter
22 april 2025 15:40
Last updated on 22 april 2025 15:44
Reading time 1 min
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Resetting the STP X 12, 15, 20, or 25-50 inverter

Sometimes it's necessary to reset the inverter when the online monitoring connection has dropped. Here’s how to do it:

  • Step 1

    Switch off the AC (alternating current) side. You can do this in your fuse box by flipping the switch for the solar group (look for the one with the Zonnefabriek sticker) to the off position.

    driefasen groep zonnestroom

    Step 2

  • Step 2

    Next, go to the inverter. You will see a blinking light indicating that it is now in error mode because the AC has been switched off.
    Now we will also switch off the DC (direct current, coming from the panels). You can do this by turning the DC switch on the device. The DC switch is a knob located at the bottom of the unit, as indicated by the red arrow in the image below.

    STP-X met pijl richting DC knop

    Step 1 Step 3

  • Step 3

    The device is now switched off on both the AC and DC sides, but there is still some residual voltage in the capacitors. You can see this by the LED lights next to the screen. After about half a minute, everything will power down and the device will be completely voltage-free.

    Step 2 Step 4

  • Step 4

    Now we’re going to restart the device, starting with the DC side by switching the DC switch back to its original position. Once it’s properly turned back on, the green LED will begin to blink slowly.

    Step 3 Step 5

  • Step 5

    Finally, we return to the electrical panel, where we turn the ‘Solar Power’ switch back on by pushing it upwards.

    Step 4 Step 6

  • Step 6

    After some time, communication with Sunny Portal and the SMA Energy App should typically resume. Note: The graphs for daily, monthly, and yearly yields may take a bit longer to appear. They usually become visible again on My Zonnefabriek and the Zonnefabriek app after a few hours.

    grafiek opbrengst zonnestroom

    Step 5

Hessel van den Berg
Hessel van den Berg
Hessel is technical manager at Zonnefabriek. He regularly reports on current developments in the world of sustainable energy. Hessel has a talent for translating complex information into crystal-clear blogs.
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