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What I had in mind when making that comment about only needing a s/w mod was connecting each module to a single PbA cell ie 2.2 V. The PIC chips work down to 1.8V.
To connect it to a 12 V battery, you would definitely need to drop the voltage down. Dividing by 3 would do it - it only draws a milliamp -and you would need to change the shunt configuration.
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