Timeline for Inverting amplifier to measure shunt voltage?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 2, 2017 at 23:20 | vote | accept | user95482301 | ||
| Dec 16, 2016 at 0:34 | comment | added | user95482301 | thanks for the link. I have to say though, that guy is crazy. Drawing 200A from lead acid batteries to power a space heater? :D | |
| Dec 16, 2016 at 0:21 | comment | added | Jack Creasey | @user95482301. Correct, and the INA169 is configured for only reading when Vin+ is more positive than Vin-. The grounds are of course common so the buffered voltage value is relative to ground in both cases. As others have indicated, measuring Ah status is challenging. The bq26220 mentioned above is definitely out of scope for you as it is meant to be driven by the host microprocessor to store accumulation values in the flash ....it's way too complex for you I would imagine. +this: electronics.stackexchange.com/questions/212723/… | |
| Dec 15, 2016 at 23:19 | comment | added | user95482301 | The reason I need two, is that when the V- is greater than V+, Vout will be zero? (e.g. when the 12V bus bar is at a higher voltage than the battery terminal, because a higher voltage is supplied from the alternator) | |
| Dec 15, 2016 at 23:17 | comment | added | user95482301 | Super input, thanks! Perhaps I can swap the battery clamps can get a high side shunt instead (all the wiring is heavy gauge, cut to length etc. so moving the shunt would be quite a pain). And it'd be easier not to deal with negative voltage on the input. Do you know the difference between these 'current monitors' as opposed to just using ordinary opamps/instrument amplifiers? | |
| Dec 15, 2016 at 22:22 | history | answered | Jack Creasey | CC BY-SA 3.0 |