SOC reset

[RayMe]

I know this has been bantered about a bit, but has anyone figured out (personally or through dealership action) how to reset the SOC display & battery shunt to 100% when the battery is actually at 100%….. best I have ever gotten was 82% and that was after a six+ hour drive home FROM dealership acter they replaced my “defective” battery. When the Grennies “smart alternator” is showing full voltage and near zero amps output, battery is at or near 100%, not 70-80%.

 

[landmannnn]

I know this has been bantered about a bit, but has anyone figured out (personally or through dealership action) how to reset the SOC display & battery shunt to 100% when the battery is actually at 100%….. best I have ever gotten was 82% and that was after a six+ hour drive home FROM dealership acter they replaced my “defective” battery. When the Grennies “smart alternator” is showing full voltage and near zero amps output, battery is at or near 100%, not 70-80%.

First point, the design on virtually all new vehicles nowadays is to only charge to about 84%. At that point the alternator slows down or stops charging. Don't ask why unless you want to hear some BS about emissions.

Anyway, I have put mine on a trickle charger and boosted it to 100%. That seems to be only way to get it there.



I have got into the 90's after a very long drive. In both cases it works it's way back down to the low 80's in a few days.

 

[Eric]

I know this has been bantered about a bit, but has anyone figured out (personally or through dealership action) how to reset the SOC display & battery shunt to 100% when the battery is actually at 100%….. best I have ever gotten was 82% and that was after a six+ hour drive home FROM dealership acter they replaced my “defective” battery. When the Grennies “smart alternator” is showing full voltage and near zero amps output, battery is at or near 100%, not 70-80%.

Your battery "displayed" state of charge is very much dependant on the battery temperature, and delayed chemical reaction from the charging cycle. Two examples a) had been on a smart charger for a few days, set off down the motorway and after the initial charge from starting, dropped to zero charging rate as you would expect on a manually fully charged battery. But the SOC was only 88%, temperature 11°. b) a few days later parked the vehicle up in the evening, battery temperature 11°, SOC 83%. Started next afternoon battery temperature up to 23°, SOC had raised to 90°without being driven from parking up at 83°. Clearly the overnight chemical reaction from driving charge and 12° temperature increase had show available SOC to the 90°. Or the SOC meter is completely garbage gimmick.

 

[Orcmurd]

Your battery "displayed" state of charge is very much dependant on the battery temperature, and delayed chemical reaction from the charging cycle. Two examples a) had been on a smart charger for a few days, set off down the motorway and after the initial charge from starting, dropped to zero charging rate as you would expect on a manually fully charged battery. But the SOC was only 88%, temperature 11°. b) a few days later parked the vehicle up in the evening, battery temperature 11°, SOC 83%. Started next afternoon battery temperature up to 23°, SOC had raised to 90°without being driven from parking up at 83°. Clearly the overnight chemical reaction from driving charge and 12° temperature increase had show available SOC to the 90°. Or the SOC meter is completely garbage gimmick.

Or, the SOC measurement tech isn’t that accurate/there is a relatively large tolerance in its reading.

 

[Eric]

Or, the SOC measurement tech isn’t that accurate/there is a relatively large tolerance in its reading.

Is that same as garbage gimmick

 

[TD5-90]

I know this has been bantered about a bit, but has anyone figured out (personally or through dealership action) how to reset the SOC display & battery shunt to 100% when the battery is actually at 100%….. best I have ever gotten was 82% and that was after a six+ hour drive home FROM dealership acter they replaced my “defective” battery. When the Grennies “smart alternator” is showing full voltage and near zero amps output, battery is at or near 100%, not 70-80%.

For me this has worked out quite well.

 

[carpetman]

I have a Victron smart-shunt on my starter battery so I can measure the true state of charge. If I fully charge the battery using my solar charger, I can get a 100% reading on the grenadier (after 6-7 hours of charging). The state of charge on the grenadier will over a couple of weeks drop into the ~85% range, while the Victron will report ~97% charged. If you see the battery voltage while running is around 14.3V and toggling between 0 and 1A of current, the battery is full. If I let the battery discharge to around 60% it is nearly impossible to get the grenadier SOC to read above 80% even when the battery is actually fully charged.

Basically the grenadier SOC value is useless at determining the SOC in the 100%-80% range as far as I can see.

However, if you want to feel good about the state of charge get a solar charger and let it fully charge the battery (connect to the terminals under the hood (bonnet).

 

[Tazzieman]

Keep going , you're nearly there!