We had attempted to implement a solar-charged lead-acid battery system in order to deal with cold weather temperatures.
An overview of our new system diagram can be seen in Fig. 0 below.
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Fig 0. |
The lead-acid battery voltage is 12V; but the transmitter box electronics requires a lower voltage -- something between 3V and 5V.
We had therefore used a 'DC-DC Converter' (the circuit board highlighted with a green rectangle in Figure 1) to convert 12V down to 3.3V.
After testing in the field, we found that 3.3V was insufficient; 5V is required.
So our plan now is to replace the current 3.3V DC-DC Converter with a 5V DC-DC converter (shown in Figure 2. below).
The procedure requires:
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Fig. 1. |
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Fig. 2. |
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Fig. 3. |