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Use this calculator to determine what size Solar Panel you need to power your Arduino/ESP8266 or ESP32 project on battery power.
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When there is a deficit you need a larger solar panel. On the second tab, you will notice that charging is cut-off when the battery is full as expected in any design. The cutoff is when the battery capacity is reached.
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Also the lower section of the calculator will determine expected battery life after setting battery capacity to say 2600mAHr, the time asleep; time awake; current in sleep and current when awake.
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The result is in days.