Electronic Project ideas

here bulb is common cost. cost required for solar panel and battery are extra cost. assume light required is 3w and it needs to run for 12hours in the night from solar. total watts = 12X3=36 watts solar pannel required = 36/5= 7.2waatts. --- assuming 80% efficiency we need = 9 watt solar panel battery required = 36WH cost - 1000 to 2000/- with protection circuit

depth of discharge dod should not be more for longer life as it will reduce no of cycles it lasts. . so it is advised  to charge the battery before it discharges completely and to charge more often between uses. in experiment LiPO4 battery showed 15000, 900,600 life cycles with 10% , 80%, 100% DOD respectively.  lab report suggests not to charge 100% even but charging up to 90% gives better life.  battery capacity reduces to 65% at temperatures above 40 degrees after 1 year. charging to peak voltage reduces life.  https://batteryuniversity.com/article/bu-808-how-to-prolong-lithium-based-batteries charging the pack to only 80% instead of a full charge, and discharging to 30% is good for long life https://batteryuniversity.com/article/why-mobile-phone-batteries-do-not-last-as-long-as-an-ev-battery ultra fast charging will stress battery and must be used only up to 50% of the battery. https://batteryuniversity.com/article/bu-401a-fast-and-ultra-fast-chargers

 studies and experiments showed that, if the project life is of less than 5 years then the overall cost is less with Led acid batteries. https://www.researchgate.net/publication/311771261_Comparison_of_lead_acid_and_Li-ion_battery_in_solar_home_system_of_Bangladesh