I've got one of these shunts fitted and reading current and ampseconds from it, the ampseconds are counting up as expected but not saved across resets, it's back down to 0 amp seconds for example.
"The log data are continually stored, with an interval of 15 minutes if the IVT-S is configured in run-mode.
In case of a sensor reset, the last stored logdata will be recovered."
Does anyone know if there's a way of storing the current measurements right before shutdown as to not lose up to 14 minutes and 59 seconds of usage measurements? STORE only mentions measurement configurations.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
Hmm this is quite a question. I thought the sensor always reset to zero, guess I'll have to rework my ISA-based SOC meter.
So you want to send a CAN message so that it saves the last ampsecond readings before shutdown. I don't see anything for that in the manual either, nor for the older ISA version (ISA-MOD).
Could you have an external device do the job? I've just learned about FRAM chips for nonvolatile storage -- one guaranteed 10 trillion write cycles. Then reset the shunt on powerup and tell all other modules what the 'offset' is relative to ISA.
Bigpie wrote: ↑Sun Jan 09, 2022 8:28 am
Mine always seems to reset to zero. Damien just used permanent 12v to power the shunt, tempted to just do that.
I would think SOC meter needs to always be powered on since there are elements leeching power even in standby.
Myself i am using EV Display and it is best to keep it permanently connected also to voltage measuring circuit. It has eeprom chip to save last SOC position in case of power out though...
It resets SOC to 100% when at charging highest voltage level is reached. Does ISA have a reset signal that we could command in CAN? Then it would be easy to set ISA to 100% everytime you fully charge the pack. Even with Chademo.
Any other consideration i am missing here?
I don't have anything connected to HV when the main contactors are open so shouldn't be any leeching. I'm going to change the shunt to permanent 12v and have my charging code reset the counters to 0 and have my SOC be calculated based on 80% of the ah rating of the pack. I think that'll do for now.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater