150V 45A MPPT - roll your own

Author	Message
hugocamaras Newbie Joined: 12/04/2019 Location: Brazil Posts: 24	Posted: 03:41pm 30 Mar 2020         poida said   Hugo, I ordered 5 boards. I will need 2 only so I can send you one if you like. But first I need to get a few things done. The boards are arriving soon. I have bought the SMD resistors and caps, MOSFETs and diodes. I have enough DC bulk capacitors. I have fleshed out the code which has not been tested in any way. I need to be able to simulate a solar panel. How? No idea actually. I have some linear bench power supplies that permit constant voltage and/or constant current control. I think I am going to use them. Maybe have one with 5A max limit, and 30V output. Have other 1A max and 45V output. Put them both in parallel. This will give a clear peak power of 6A at 30V, dropping very quickly to 1A at 31V. I have a nice buck converter with input and output voltage and current sensing. Maybe with  a bit of software I could make it provide 5A for output volts from 5 to 30V and reduce amps to zero by 35V output. This would simulate well a 5A 30V (150W panel). And then I need to simulate a battery. I have some batteries but they are charged up. I am thinking of a microcontroller based DC load. The code will apply a constant DC load for voltages up to 24V and reduce it to near zero at 27V. That will give the mppt charge function a workout. Hello Poida! Yes, I would like you to send me a board.