stevend
Posts: 430
Joined: Fri Oct 11, 2013 12:28 pm

Re: Hardware suggestions for battery monitoring

Sun Sep 26, 2021 8:28 am

On the subject of measuring battery voltage, any solution involving potential dividers is going to involve a small standing current through the divider. The resistor values used here will be a trade-off between current drain and potential measurement accuracies due to having a high impedance source.
If this current is unacceptably high, there are high-voltage analog switches (The DG508 is an old example; there are probably more suitable parts nowadays) which can be used to select the input to the A-D converter.

JohnsUPS
Posts: 261
Joined: Fri Jul 06, 2018 2:13 am
Location: USA

Re: Hardware suggestions for battery monitoring

Mon Sep 27, 2021 1:24 am

When reading this, I was wondering about the possible application for a LTC1043 switched capacitor building block. It isn't cheap, but it would be ideal for sampling a voltage from points without a common ground. However, the maximum supply voltage is 18v........

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