Teardown of a 22+ kW peak solar inverter, from a company that at some time was called Ever Solar. Now it seems to have been Eversol or Zeversolar. A Chinese OEM product that has been sold under various names and brands.
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 Ever Solar TLC 17 K
The front has a display with 4 navigation buttons. The bottom has input connectors for 5 Photovoltaic panel strings. 4 of them in a group rated fro 22A and 1 string rated for 11A. There is interfaces for USB, RS485 and RS232. The mains plug is a round multi-pin connector, that seems a bit odd for mains connection.
The PV inputs run through each their CLCLC filters, before continuing as LV1 and LV2. LV1 and LV2 is fed into two similar inverters, with different current reating and thus different components. LV1 inverter uses Infineon K40T1202 IGBTs rated for 1200V and 40A. LV2 inverter uses Fairchild FGA25N120ANTD IGBTs rated for 1200 V and 25 A. Both inverters uses ON semiconductor RHRG75120 hyperfast diodes rated for 1200 V and 75 A.
In the video teardown, I mention that the DC link capacitor bank seems to be mid-point connected and it turns out it is. The 3 white IGBT modules are FZ06NPA045FP modules, that consists of 6 internal switches and 4 diodes. It is a neutral point clamped inverter module (NPC) that is typically implemented in HVDC transmission systems. Despite its complexity it has found a use in solar inverter systems as it can balance different inputs and energy sources. It is also known as T-type inverter. This topology can work with batteries attached and maintain MPPT operation.
The inverter itself is controlled by a Texas Instruments TMS320F28 FPGA and the interfaces and built-in webserver is running on a Atmel AT91SAM1261 ARM-based embedded microcontroller with all its regular features found in a PC. The Ever Solar TLC 17 runs Solar web service, but the name of the same software seems to change with the name put on the outside of the unit.
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