Homemade solar charger with auto cut off - အားပြည့်လျှင်အလိုအလျောက်ဖြတ်သော အိမ်လုပ်ဆိုလာအားသွင်းစက် 

Welcome to ASM Basic Electronic Projects.
My new channel:
/ @asmknowledge
I'll introduce homemade solar charger with auto cut off system that can be used to charge 12V battery.
Required components:
1) LM7812 regulator / heat sink
2) 10uF capacitor
3) 12V relay
4) red LED, green LED
5) 3.3k ohm resistor
6) 15k ohm resistor
7) 10k ohm preset
8) 1N4007 diode
9) 10A10 diode
10) bc547 transistor
11) battery clips
12) wire
Firstly, +12V regulated power is made for 12V relay. Positive wire of solar panel is applied to pin1 (input) of 7812 ic and negative wire of solar panel is connected to pin2 (ground) of ic. Pin3 (output) of ic produces regulated +12V and it is wired to the coil of relay. Another terminal of coil is connected to the collector of bc547 which controls relay on/off. The emitter is grounded. 1N4007 diode is also installed at relay coil in the reverse polarity.
10k ohm preset is used to adjust the cut-off voltage.
Middle point of preset is connected to the base of bc547 and other terminal of preset is grounded. Remaining terminal of preset is wired to positive node of battery by inserting 15k ohm resistor.
A anode red LED is connected to N/C (Normally Closed) pin of relay for charging condition. The anode of green LED is connected to N/O (Normally Opened) pin of relay to indicate fulling charge.
The cathodes of LEDs are wired to the ground via 3.3k ohm current limiting resistor.
Positive wire of solar panel is also applied to the common terminal of relay. N/C pin of relay is connected to positive node of 10A10 diode and negative node of diode is wired to red clip (for positive terminal of the battery). Negative wire of solar panel is directly wired to the black clip (for negative terminal of the battery).
Red LED will glow when the battery is in charging process. Green LED will glow when the battery is fully charged.
The solar charging process will automatically stop when the voltage across the battery reaches the preset cut-off voltage.
Thank you very much.
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#asmbasicelectronicprojects
#Homemadesolarchargerwithautocutoff #အားပြည့်လျှင်အလိုအလျောက်ဖြတ်သောအိမ်လုပ်ဆိုလာအားသွင်းစက်
#Howtomakesolarchargecontroller #diysolarchargecontroller
#12vbattery #12vcharger #batterycharger #chargercircuit
#solarchargecontroller #solarcharger #solarpanel
#solarenergy #renewableenergy

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