good morning everyone. I am planning to install ultrasonic sensor to measure the water level in the remote local with sim900a module. though I have attached a 12v 7.5 ah battery with 10 w solar panel (12v). with all this the battery is draining very fast so I request anyone to tell the size of the battery in terms of amps. I think sim900a module takes lot of current.
How much current does the project draw now?
Post a schematic.
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What does the rest of your project look like? The sim900 module draws up to 2A in transmit mode. How often do you send data? How are you dropping to 12V? if you are using a linear regulator you are wasting over half the capacity.
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You have major problems, your solar panel is way to small. This is not complete but it will get you in the ballpark. First determine your total load at 12V , then multiply it by 1.2, use that as your current requirement. Next multiply that by the number of hours the battery needs to keep it operational, that gives you the minimum battery capacity. Next determine how much sunlight is available, this chances all over the world, there are tables etc on line you can get that information. Then using that number multiplied by 0.8 (safety and cloud factor) you can determine the solar cell current requirement to charge your battery in 10 hours. That is above your operating requirements during sunlight.
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