Hi, I have been looking around for some data on the topic, what I have found so far is that the chip uses a lot of energy at the peak, about 2A. My background is not in electronics, so I don't know if I am missing something but I believe that for my calculations, I need the amount of time it uses said 2A. I also read in other posts that it takes 30 seconds to register in the network, so I assume it is 2A for 30 seconds? Then I also found this PDF
It states that the SIM900 uses834 mAs when registering in the network, which then converted to mAh is very low.
My problem is that I need to check for config updates on my firebase server every 5 minutes, and I expect a 1 second response time. I would assume based on the PDF, that the way to go is to keep turning on and off the SIM900 since it uses such a low amount of current, from what I understand.
So if the network registration takes 30 seconds, and I need to do this 12 times per hour per day, will my final mAh be: 847 mAs * 30 =6.95 mAh * (12*24) = 2001.6 mAh?
This seems quite high because my battery is just 25Ah. The PDF says that in idle mode, the SIM900 takes 456 mAh per day, so this seems far better. Further in the document, says that the power save mode uses only 26mAh a day.
Can anyone tell me if this is true? I really don't have the equipment to test my self, or even the money to buy one, or the knowledge. If anyone is kindly enough, I could provide more detailed information about my project, the goal is to keep it alive 1 year before a battery replacement.