Doubts Smartshunt cycle counting.

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Fra asked Jan 16, '21

Doubts Smartshunt cycle counting.

Good evening, I have been a very satisfied Smartshunt owner for about 2 weeks.

But I have some doubts.

1) I would prefer victronenergy to change the cycle count setting.

In fact, the software only counts a cycle when the battery drops below 65%. This is misleading.

I use a total of 190ah on the camper and the average discharge is 10/15%.

It may turn out that an Agm battery reaches the end of its life and the Smartshunt records only a few dozen cycles.

When in reality the battery has done the 1000/1200 cycles of 15/20% discharge.Cycles that are not counted by the Smartshunt.

Fortunately, the synchronization count is more realistic. Since a synchronization is counted every time the Soc goes below 90% and goes back to 100%.

So I associate the synchronizations with the number of cycles.

It is not possible that in two weeks of daily use it has only 2 cycles.

In reality I am 15 cycles of 20% of discharge... in fact I have about 15 synchronizations.

Otherwise my batteries will die with only 10/20 cycles recorded.

BMV Battery Monitor SmartShunt discharge level

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Answer 1 · 2021-01-17T05:41:23Z

Paul B answered · Jan 17, 2021 at 05:41 AM

I am pretty sure this is how it works

1 cycle is 100% to 0% SOC = 1 battery cycle

so 10 moves from 100% to 90% capacity or 10 x 10% usage = 1 Cycle

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Fra commented · Jan 17, 2021 at 10:18 AM

Hello. This is what the manual says:

"Total Charge Cycles: The number of charge cycles during the life of the SmartShunt. A charge cycle is counted each time the state of charge falls below 65% and then rises above 90%."

In my opinion that's not correct, as battery cycles can be counted even when they are lighter.

My battery, from the spec sheet, supposedly lasts 1000/1200 cycles by 30%.

The Smartshunt does not detect any 30% cycle.

It only detects cycles greater than 35%.

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Answer 2 · 2021-01-17T11:59:53Z

JohnC answered · Jan 17, 2021 at 11:59 AM

@Francesco

You're right, and I think Victron could do better with this. To illustrate, my own SmartShunt over about 5 months shows zero cycles, doesn't necessarily sync every day, and can't give an average discharge. I draw down daily to about 85% SOC in summer, and maybe 70% in winter. This means meaningless figures..

1610884301183.png (39.8 KiB)

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Answer 3 · 2021-07-14T19:23:14Z

mryoshii answered · Jul 14, 2021 at 07:23 PM

Hi.

I can only agree here. 1 cycle is only counted when you discharge about 40% from the battery.

I have 10 syncronizations and discharge my battery to 75% daily

The battery has 230Ah and according to the total drawn Ah I should have 3.9 cycles.

Would be happy about an update.

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