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Monitoring an INA219 chip in a Raspberry Pi battery-backed power supply
from blog Kevin Boone's website, | ↗ original
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How worried should we be, that we're wasting electrical energy for no benefit?
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Using an ammo box as portable 12V power supply
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A military-surplus steel ammunition box makes a great housing for a high-current, outdoor 12V power supply. This article gives some ideas about how to build one.