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©[email protected] 2017
Automatic Porch Light using Solar Power.
©[email protected] 2017
Objective
• Having a porch light that switches on at dusk and switches off at dawn, automatically.
• Powered by a single solar panel.
©[email protected] 2017
Item 1 – Solar panel 12V 10W
• https://www.lazada.com.my/12v-10w-watt-polycrystalline-cells-solar-panel-poly-solar-module-battery-charger-13254147.html
• RM93• RM93
©[email protected] 2017
Cheaper – Solar panel 12V 10W
• http://www.lazada.com.my/10-watt-10w-polycrystalline-solar-panel-12v-ready-stock-28045065.html
• RM76 – no longer available• RM76 – no longer available
©[email protected] 2017
Item 2 – Solar Charge Controller
• https://www.lazada.com.my/dual-usb-pwm-102030a-solar-charge-controller-12v24v-lcd-displaysolar-panel-charge-regulator-models10a-83267837.htmlmodels10a-83267837.html
• RM34.70
©[email protected] 2017
Item 3 – 12V 7.2Ah GP Battery
• https://www.lazada.com.my/genuine-gp-12v-72ah-rechargeable-sealed-lead-acid-battery-gpp1272-29285514.html
• RM60• RM60
©[email protected] 2017
Item 4 – 12V White Light Bulb
• https://www.lazada.com.my/e27-5w-6000k-led-bulbs-lamp-for-dc-12vwhite-light-101540546.html
• RM14.20• RM14.20
©[email protected] 2017
CostItems Price
Solar panel 12V 10W RM93.00
Solar charge controller RM34.70
GP 12V 7.2Ah Battery RM60.00
12V DC White Light Bulb RM14.20
• Not inclusive of labour, wiring, conduit & installation charges.
TOTAL RM201.90
©[email protected] 2017
Calculating The Load
Power for Bulb 12V 5W• Dusk to dawn = 12 hours.• 12 hours x 5 Watt = 60WH.
Power from 12V 7.2Ah Battery• 7.2Ah x 12V = 86.4WH• Being a sealed lead acid
battery, you get only 50% of that power.
• 86.4WH x 0.5 = 43.2WH • 86.4WH x 0.5 = 43.2WH (<60WH; inadequate)
• If 12V 12Ah;12Ah x 12V = 144 WH50% would be 72WH. Enough.
• https://www.lazada.com.my/genuine-gp-12v-12ah-rechargeable-sealed-lead-acid-battery-gpp12120-96324854.html (RM129.50)
Power from Panel 12V 10W• Dawn to dusk = 12 hours.• Kuala Lumpur Daily Daylight
Average = 6 hours• 6 hours x 10 Watt = 60WH.• So 1 solar panel 12V10W
can generate enough power for one 12V5W bulb.
©[email protected] 2017
The Installation
Solar panel on roof top.Solar panel on roof top.
Wiring from solar panel to solar charge controller.
Wiring from solar panel to solar charge controller.
roof top.roof top.
Solar charge controller.Solar charge controller.
Solar charge controller.Solar charge controller.
12V bulb12V bulb
12V battery12V battery
©[email protected] 2017
Connecting Everything – Step 1
1. Connect battery to solar charge controller. It will detect the type of battery.
1. Connect battery to solar charge controller. It will detect the type of battery.
©[email protected] 2017
Connecting Everything – Step 22. Connect solar panel to solar charge controller. It will detect the type of solar panel.
2. Connect solar panel to solar charge controller. It will detect the type of solar panel.
©[email protected] 2017
Connecting Everything – Step 3
3. Connect light bulb to solar charge controller.
3. Connect light bulb to solar charge controller.
©[email protected] 2017
Connecting Everything – Step 4
4. Click on this button 4x until you get this work mode display.
4. Click on this button 4x until you get this work mode display.
©[email protected] 2017
Connecting Everything – Step 5
5. Then press on this button for 5 seconds until it starts blinking.
5. Then press on this button for 5 seconds until it starts blinking.
©[email protected] 2017
Connecting Everything – Step 6
6. Then click on this + button once so that it displays “00”. Then the light will switch on from dusk to dawn. “24” means that it will be on 24 hours. You can set from “00” to “24”.
6. Then click on this + button once so that it displays “00”. Then the light will switch on from dusk to dawn. “24” means that it will be on 24 hours. You can set from “00” to “24”.
©[email protected] 2017
Connecting Everything – Step 7
7. Then click on this button once to save the setting. Now you’re done.
7. Then click on this button once to save the setting. Now you’re done.
©[email protected] 2017
Conclusion
• As expected I couldn’t get the light to run from dusk to dawn due to the wrong capacity of the battery. I should have bought the 12V12Ah battery instead of the 12V7.2Ah battery. Wrong battery instead of the 12V7.2Ah battery. Wrong advice received.
• I should cover back the cost of my investment within 100 days of use. It should last for 2 years.
• The light was bright enough to illuminate the porch.