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Power consumption recording while idle and while listening to some tunes.
| Idle | 19 mA |
|---|---|
| Running | 260 mA |
Standby Time (3.2Ah/0.019A) | 7 days |
Run Time (3.2Ah/0.260A) | ~12 hours |
Should probably add a kill switch to eliminate the idle power consumption.
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Module name: 3S 12.6V Li-ion Lithium Battery 18650 Charger Protection PCB BoardSuitable range: For nominal voltage 3.6V 3.7V lithium battery(Including 18650,26650, lithium polymer batteries)
| Specification | Value |
|---|---|
| Charging voltage | 12.6V |
| Maximum output current | 20A |
| Maximum output power / charging power | 252W |
| Low Voltage Disconnect | 9V or 3V/cell |
| Size | 59 x 20 x 3.4mm |
Buck Converter
Specifications
| Module property | Non-isolated buck module |
|---|---|
| Input voltage | 3.2-40V (try not to exceed 38V as input) |
| Output voltage | 1.25-35V continuously adjustable |
| Output current | 0-3A |
| Working temperature | -40~+85 degrees |
| Working frequency | 180KHz |
| Conversion efficiency | up to 92% (efficiency related to input, output voltage, current, voltage difference) |
| Switching frequency | 65KHz |
| Output ripple | <30mV |
| Short circuit protection | Limited current 8A |
| Over temperature protection | Automatically turn off the output after over temperature |
| Input reverse connection protection | None, (If necessary, please input a large current diode in the input string) |
Question: Can we safely charge this with our 14.6v 20A Charger?
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So, we added a buck converter to the input which drops the voltage to 12.6v to charge the battery and power the speaker. This buck module was simply hot glued to to the bottom of the board.
Added a switch to isolate the battery and prevent battery drain from the buck converter when not in use.
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And voila, all done and running on battery and it sounds amazing!
References
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|---|---|---|---|---|---|---|---|
| User Manual |
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| Service Manual |
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