Solar Charger Controller Adjustment
design page
program of charger controller

Attention! Wrong work device can damage connected mobile phone, because you must carefully check charger before use it. You must know that you make this device for your own risk only. I give you recommendations for check charger device, but I can't give you any warranty. If you don't have enough skills and experience better if you will not make this work.

At first you must check supply voltage for AVR controller. It must be in 4.9-5.1V area. For exactly work voltage measurement better, if you write measured voltage to macros AVR_POWER_VOLTAGE in file battery_calc.h. and compile hex-file for your device. If you don't worry about exactly work accumulator's charger part and supply voltage of controller in area 4.93-5.01V, you can use my hex-file. After it program controller.

Step 1: check current source.
Set power supply at 8…12V and connect to accumulator connector. Voltage on output of current source must be limited on 5.5-5.8V. Zener diode D13 must have environment temperature. After it load current source output resistor's load 10 Ohm 5W. Output current must be 350-450 mA. If current value is in this limit we must measure short current. Short current must be in 1.0-1.2A area. If source current meets these conditions therefore current source work right.
Step 2: check charge controller's circuit.
The best way for check maximum power point tracker is using power supply with settings voltage and current limit. In this case set 15V 0.1A power supply, connect to output of current source 10 Ohm 5W load resistor and on power. If you will see as power supply switch between voltage stability and current limit modes with frequency near 1 time a second we can say that voltage convertor and tracker is work. Addition check is oscilloscope control voltage on ADC0 (pin 23) ATmega8 controller. It must be near 100mV and you can see fluctuation in 1-2 step of tracker (~5-10mV). Up current limit to 160 mA. Voltage on pin 23 must be 270-300 mV with small fluctuation.

Check voltage measure part: connect power supply to connector for accumulator battery and set to 5.6V. "Discharge" led must be light. Up voltage to 6V. "Discharge" and "normal" leds must be blinking. Up voltage to 6.3V. "Normal" led must be light. Up voltage to 7.3V. "Full" led must be light. In case you see switch leds light in right level of voltage it means that voltage measurement work correctly.

Without power supply you can use solar panel. Check short current of panel, must be 70-120mA. Connect controller to solar panel. Load output of current source by 10 Ohm 5W resistor. You can see aid oscilloscope as MPPT find max of current on pin 23 of controller. On connected accumulator you can measure voltage and check leds voltmeter.

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