Teardown of a 3.7 kW peak solar inverter, the Delta Solivia 3.0. It is based on TO-247 MOSFETs for voltage regulator and isolation. The output inverter design uses IGBTs. A secret place for MOSFET and IGBT lovers.
If you are looking for other solar inverter types, check out the long list of teardown videos. Firstly it could be Fronius IG Plus 2LT-2: 6 kW Solar Inverter Teardown and Analysis. Secondly it might 10 kW Sirio 10000P Solar Inverter Teardown. Or thirdly it could be ABB TRIO 20 kW Solar Inverter – Unboxing and Teardown that you are looking for.
Inside the Delta Electronics Solivia 3.0
The outside of the inverter contains the bare minimum. 3 status LEDs, LCD display and 4 navigation buttons. Connections at the bottom is 3 PV strings, USB, RS485 and mains connection.
The PV strings first go through a EMI filter. The first inverter, most likely for stabilization of the voltage consists of Infinion IPW65R070C6 / 65C6070 MOSFETs, rated for 700 V and 150 A pulsed operation. The isolation / voltage regulation inverter uses a half-bridge of Infinion IPW65R080CFD / 65F6080 MOSFETs, rated for 700 V and 137 A pulsed operation. The rectifiers before the DC bulk capacitance is ST STTH30R06C ultrafast high voltage rectifiers, rated for 600 V and 15 A. The output single phase mains inverter consists of two different parts, MOSFET and IGBT. The MOSFETs are Infineon IPW60R070C6, rated for 650 V and 159 A pulsed operation. The IGBTs are Infineon IKW75N120CH7, rated for 1200 V and 300 A pulsed operation.
The inverter controllers are two different versions of the Texas Instruments TMS320F28xx series. A smaller one sits on a dedicated inverter driver board, connected to the larger communications board. The larger communications board also hosts a Microchip PIC18F45 microcontroller.
Delta Solivia 3.0 TR Specifications
INPUT (DC) SOLIVIA 3.0 EU TR
Max. recommended PV
power 3700 WP
Nominal power 3300 W
Voltage range 125 … 600 V
Full power MPP range 150 … 480 V
Nominal current 9.2 A @ 360 V
Max. current 22 A
OUTPUT (AC))
Nominal apparent power 3000 VA 1), 2)
Voltage range 184 … 264 V 3)
Nominal current 13.1 A
Nominal frequency 50 Hz
Frequency range 45 … 65 Hz 3)
Power factor adjustable 0.8 cap … 0.8 ind
Total harmonic distortion
(THD) < 3 % @ nominal apparent power
MECHANICAL DESIGN
Size (L x W x D) 418 x 410 x 182 mm
Weight 21 kg
Cooling Convection
AC connector Wieland RST25i3S
DC connector 3 pairs of Multi-Contact MC4
Communication interfaces 2 x RJ45 / RS485 + 1 x USB A
DC disconnector Integrated
Display 3 LEDs, 4-line LCD