skip to Main Content
Everything You Need To Know About Your New SMA Sunny Boy Inverter

Everything You Need To Know About Your New SMA Sunny Boy Inverter

The SMA sunny boy inverter is a transformerless device with dual MPP trackers. This converts the current of the PV array to alternating current that is compatible with the utility grid. In other words, it ensures that the direct current generated from your solar power system is converted into AC electricity, which matches the power on the grid.

Your SMA sunny boy inverter is the large black box that is installed either on or inside your home. It comes with a display, serial number, power switch, and a bunch of other features that ensure the device fulfills all your energy-related needs. If you’re new to the world of solar power, then here is a brief guide on everything you need to know about your SMA sunny boy inverter.


Mounting the device

Several requirements must be followed when identifying the mounting location for the device. Firstly, it must be inaccessible for children for safety reasons. If you are mounting your SMA sunny boy inverter on drywall, then we recommend installing it in an isolated part of the house away from bedrooms, the living room, and the dining area. This is because the device can emit humming vibrations, which can be annoying to some occupants.

Furthermore, the ambient temperature of the mounting location needs to be between -25 degrees Celsius and +40 degrees Celsius. It also needs to be sheltered from moisture so that the LED signals can be read without any difficulty.


Connecting the device

Two men installing SMA sunny boy inverter

A qualified technician should only handle the mounting and connecting of the device. When your SMA sunny boy inverter is being connected to the grid, there are several things that need to be followed. Firstly, the grid voltage must be in the permissible range. To do this, disconnect the circuit breaker and dismantle the AC cable by 50 mm. Ensure all the conductors are in place on the bush insert.



Troubleshooting various problems with the device is generally straightforward. Check out some of the most common issues below.

Forgotten password

If you have forgotten your password, then you can still unlock the device using your PUK – personal unlocking key. You’ll need to request your PUK from the manufacturer. Once you receive the access, activate the UI, enter the PUK where it says “password” (instead of your usual password) and then select “login”. After logging in, pull up the menu entitled “device parameter”, and then select “edit parameters”. In this group, navigate to “user rights” and then click on “access control” – where you can now change your password.

Flashing red light

If your SMA sunny boy inverter is flashing red light, then chances are you have what is known as a “ground fault”. If your device’s interface is showing these event numbers; 3601, 3501 or 3701, then you probably have a ground fault. This means that the cable running from the PV system to the ground is damaged. If this error occurs, make sure you reach out to a qualified professional since there is a danger to life because of electric shock. Make sure you adhere to the following prescriptions:

  • Do not touch the frame of the PV array
  • Do not connect PV strings that may have ground faults to your SMA sunny boy inverter
  • Check the PV system by measuring the voltage (this will determine whether there are ground faults present)

If you are concerned about the efficacy or safety of your SMA sunny boy inverter, then do not be alarmed. There is plenty of ongoing support provided by your manufacturer to ensure that your device is always safe and operational!