PWM Solar V1.1 Update

After about 2 months of continuous operation IRF9504 failed. I guess that is due to heat up. The cause of heat up , as i assume is slow switching off time due to i have used 22k resistor to switch off the mosfet. Further arduino board got burned out ( as it seems entire flash is erased due to electrical shock) while testing. Time to design a PCB with proper safety features. (Fuses , MOVs) and improve the mosfet switching using dedicated mosfet driver. while I am designing dedicated featured circuitry. I purchased a 10A solar controller from aliexpress.

This has impressive circuitry as discussed in following video post. https://www.youtube.com/watch?v=BbIqNGHe6Xc

PWM solar Version 1.1

With the New 80W solar panel in hand , Decided to build proper circuitry with LCD display. Following are the major parts used mainly purchased via ebay.

•  IRF9540 P-Channel Power MOSFET
• 6x8cm Double-side Prototype PCB Universal Printed Circuit Board
• 16X2 Character LCD Module Display Blue IIC/I2C/TWI/SP​​I Serial Interface
• Arduino pro mini - 5V system
• IRF520 ( For swithon bulbs automatically at night)

In this setup I am using three 7AH 12V batteries connected in parallel.

Here the solar panel placed on  the roof.

 2 12V 7Ah lead acid batteries shown here.

The circuitry. consist with arduino , PMOSFET , 6A Diode, ACS712 current sensor module and IRF520 to switch on the bulbs (small 7W LED)

 Following is the out put of the display.Top left it display the solar panel voltage. Top right it shows the battery voltage. Currnelty battery charge to it optimal level 13.5V. and it is in the floating charge state. Lower left shows the current posistive shows that it draws some current from the battery.

Web Connected - PWM Solar Charger

I have already build a PWM solar controller, mainly with P-MOSFET  and arduino-nano. And N-MOSFET to switch on some lights when night falls.

Following a few snaps of it. It uses 10W /12V solar panel with 7Ah 12V Lead Acid battery.

Following is a realtime battery voltage using ESP8266 and  thingspeak platform.

Got a New 80W solar panel for Rs.9000. Plan is to build PWM Solar charger with Web interface so i can see the statistics of the Solar Charger System, Battery Condition via Internet and within Wi-Fi.

Following the Plan for new PWM solar charger (Web Enabled).

A Sample sketch for the webpage. Running on ESP8266 in Access Point Mode.