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deba168 / MPPT_Master

ARDUINO MPPT SOLAR CHARGE CONTROLLER (Version-3.0)
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Battery icon improvements #11

Closed rkuris closed 9 years ago

rkuris commented 9 years ago

@deba168 this gives you a better battery icon. It works great, let me know if you want to see a video of it operating.

I also changed the code to support having a different load control algorithm. You are probably using solar just for lighting, but I want to take excess power and use it, but I don't want my battery to run down at all.

deba168 commented 9 years ago

I am really excited to see the operation videos. Have you changed anything in current sensor code? I think it needs some improvement. I want the complete load control code also.Though it is not important for me but it will be helpful for other. Please send a fully modified code to my mail. Now we have to solve the ESP8266 part. Thanks.

rkuris commented 9 years ago

@deba168 here's a video of one of my tests https://www.youtube.com/watch?v=nDfRm2a05-U

deba168 commented 9 years ago

Have you connected the solar panel ? Or it is simulation.I did not see any change in Current.

rkuris commented 9 years ago

I have the current sense pin shorted to 5v during this test, so it looks like max current. This is just a test on the bench.

On Mon, Jul 6, 2015, 6:41 AM OpenGreenEnergy notifications@github.com wrote:

Have you connected the solar panel ? Or it is simulation.I did not see any change in Current.

— Reply to this email directly or view it on GitHub https://github.com/deba168/MPPT_Master/pull/11#issuecomment-118857173.

deba168 commented 9 years ago

Ok got it :) Is there any problem in MOSFET ( Shorting Q3) during the test ? Can you test it by connecting a solar panel and battery ? One more thing can be improved in sensor reading.In the existing code sensors are calibrated by in term of 5.0V/1024.The problem is that if due to any reason the Vcc is not 5.0 V the sensor reading are incorrect.So it is better to use Reference voltage instead of Vcc.It will remove the errors in reading.

rkuris commented 9 years ago

I have not tested the MOSFET shorting problem. However, I think I fixed it because the system now starts OFF and doesn't turn on until several passes through the loop. I think the biggest problem with destroying the MOSFETs has to do with the ringing and voltage overshoot. I will be hooking up the circuit to a scope sometime soon and making some changes.

It is not easy for me to test the system with solar and battery yet. I don't have any sunlight or a solar panel where I live, so I have to do that on my boat, where I don't have a lot of electronic equipment.

Your 5V reference voltage is going to cause some errors. The voltage regular you've picked does not have a very good adjustment potentiometer so it's very hard to get exactly 5V. I was thinking of replacing the potentiometer with a 10 turn one. However, you might still see some drift with temperature changes. I am not sure how much difference these errors will make. Battery float voltages change with temperature as well.