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51 lines
2.9 KiB
Markdown
51 lines
2.9 KiB
Markdown
# SMA-SB2500-Off-Grid
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The grid tie solar inverter SMA Sunny Boy SB2500 is a beautifully designed transformer isolated grid tie inverter. It is probably possible to convert it to an off grid batter inverter by reprogramming or redesigning the logic board
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Checkout my [hackaday.io](https://hackaday.io/project/183357-grid-tie-inverter-sma-sunny-boy-sb2500-openlogic) page for pictures of the inside of the inverter and a project log.
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The block diagram from the SB2500 manual.
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The inverter has an H-bridge with 4 IGBTs (SKW30NF60) driven by IR2113S mosfet drivers. These drive an 2mH inductor + 4.7uF capacitor step down converter and then a isolation transformer 153V primary/230V secondary 9.6A. On the grid side are three safety relais, EMC filtering and a measurement transformer for the logic board the measure the grid voltages.
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All the logic is powered from the DC side, several voltages are generated using a switching power converter which generates all the drive voltages for the IGBT drivers and the logi board.
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The logic board contains an SAFC808 microcontroller, probably with an interchangable AT70C020, 2 MBit memory chip, for grid monitoring and sequencing. A DSP56F803 from Freescale provides the switching waveforms.
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The layout is drawn in Kicad.
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Exported kicad images (probably not up to date) are in the images folder.
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The src folder can contain the Freescale DSP code.
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The datasheets folder contains datasheets of most of the electronic parts in the inverter.
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# Already known
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* Switching frequency 16khz
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* 250 - 600VDC max input voltage range
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* 2200W nominal power
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* It is probably challenging to reuse the logic board, as one of the microcontrollers is OTP, maybe it can be bridged and only the DSP used. But then you need a [Freescale USB TAP](https://www.nxp.com/docs/en/user-guide/CWH-UTP-UG.pdf) JTAG programmer to program the DSP. The development environment is not easy to download, but it looks easy to use.
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* The [DEFCON 18 badge](https://media.defcon.org/DEF%20CON%2018/DEF%20CON%2018%20badge/) has used the same development environment and might be a good place to download the development environment and some general guide.
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# Already done
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* Basic pinout of the logic board connection in Kicad
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* Basic layout of the power board important parts in Kicad
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# TODO
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* Check if pinout is correct by measuring the voltages on the logic board connector
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* Check all voltage ranges of the voltage measurements on the logic board connector
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* Try to reprogram logic board
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* Or design new logic board
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# Interesting links
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* [Arduino based grid tie inverter repo](https://github.com/MartinStokroos/openMicroInverter)
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* [Pic based grid tie inverter repo](https://github.com/rajeshfarswan/UDQ-GRID-1P
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* [STM based grid tie inverter repo](https://github.com/fotherja/Grid_Tie_Inverter)
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* [STM based grid tie inverter 2 repo](https://github.com/fotherja/Grid_Tie_Inverter_2)
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* [TIVA-C based grid tie inverter](https://github.com/srpoyrek/NIVAS)
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