If It Ain't Broke ... Part Deux

Since the new Volt/Amp meter was such a hit in the PorschEV, I ordered another one for the evTD. I failed to point out in my earlier post that this device, unlike some other Chinese wizardry, comes with documentation that is actually useful and even in color!

It will replace the trusty JLD404 that has served so well for the last six years. Like the EVIC, it became invisible in sunlight. The JLD404 has the logic contained in the display, so it needs to be powered on full time to retain the cumulative amp hour data. 

That led to several "bricking" incidents where the 12 volt auxiliary battery went flat. I designed a module to keep the 12 volt battery charged from the main pack whenever it gets low. The display of the new Volt/Amp meter will be turned off when not in use, so it will add less parasitic load.

This was a fairly straight forward like for like replacement, so the 1000 amp JLD404 shunt was swapped out for the 500 amp shunt/logic unit.

Similarly, the JLD404 mounted below the dash was replaced by the new unit.

Where the JLD404 displayed only one value at a time and had to be toggled from amp hours to run time to amps to volts, the new meter shows volts, amps, and run time simultaneously with the battery capacity gauge representing amp hours. Amp hour data can be seen on a detail view that also allows for configuration.

Postscript:

Discovered that the inverse display really is visible in direct sun! That's good news since the top is rarely up on the evTD ... too much fun open air motoring.