Bashir

@Mauritius B thanks! The high voltage side was blown.

Thanks @Beat. Keen to try all suggestions and will provide an update after having the earth - neutral bond checked. @Scorp007The automation guy referred to the blown coil as a "toroidal transformer" - and it looks like the photo attached. Once it blows, there is a buzzing sound audible.

Hi. I recently had a Growatt SPF 5000 with a Hubble 5.5KW battery installed. A couple of days later, my garage door motor stopped working. Automation guys came out and diagnosed a burnt out coil (garage door motor is around 29V if my memory serves me correctly - ET Blu). They changed the coil and a couple of days later, the same happens. Before installing another, they took away the motor and tested it off-site. Ran for a few days without issue. Brought it back to my place, installed it and also installed an Ellies surge protector to be safe. A few days later, the coil burnt out again. I had the electrician remove the garage circuit from the inverter supply and the problem disappeared. A few weeks later, I installed a new sliding gate motor and the electrical forgot that it was to be connected directly to Eskom supply and not to the solar back-up supply. A couple of days later, the brand new sliding gate motor stops working. Another burnt-out coil! Something in the solar supply is clearly causing the coils to blow. My initial thought was the frequency setting on the inverter, which I've checked - and is at 50Hz. The installer has indicated that he will take the unit in for an inspection as its still under warranty. Does anyone have an idea what could be causing this? All suggestions would be most appreciated. Thanks in advance!

Hi. I had an installer setup a Growatt 5KW with a Hubble 5.5KW battery. Since installation, I’ve had three blown coils - (2 on the garage door motor and 1 in the sliding gate motor. Both motors are ET. I’ve now had to remove this circuit from the solar backup supply. The Frequency on the inverter is set to 50Hz - which I thought could be causing the problem. Any ideas what is causing this?