Originally Posted by Dockhead
....I would think that a perfect battery monitor
could be made by combining the Smartgauge approach with data about loads from a shunt....
I've had long discussions with the SmartGauge Owners about this - it would also give us an amps IN/OUT reading as well.
But they were very clear that they would never add a shunt to the SmartGauge for two reasons.
Reason number one:- it is not needed to improve the accuracy. Recently feedback from Enersys, who make Optima batteries, claimed it was much better than a shunt based Battery Monitor
. They quoted an inaccuracy of 0.1% which seems unbelievable. If it was 50 times that value @ 5% I would be happy.
Reason number two:- the accuracy would probably be reduced in many cases because many installations are wrong, and the programming is wrong or just left at the default values.
Sail has said that "perhaps 7 out of 10 I see installed by pro's and DIY's are wired incorrectly (shunt wiring) and 9.5 out of 10 are programmed