PWM based Solar Battery Charger Development

Hello, I was procrastinating this project for very long time but now got some time to work on it.
It is solar charge controller rated for 12V battery and Max charging current is 10Amp.
Controller using in it is Megawin MG82F6D17 8051 based MCU. I am using it because of 12Bit ADC for more accurate voltage reading and it's built-in PCA for PWM generation.
Charging methodology is CCCV. For Bulk mode battery will be charged in Constant Current Mode and when it reaches the certain level controller switches to Float mode where tickle charge current is to keep it charged.

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