My solar array can trick the smart shunt into thinking the reset of SOC to 100% has been reached. Are there any fixes to this?

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jdsilwones asked Feb 20 2021 at 11:29 PM

My solar array can trick the smart shunt into thinking the reset of SOC to 100% has been reached. Are there any fixes to this?

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Answer 1 · 2021-02-20T23:42:29Z

Matthias Lange - DE answered · Feb 20 2021 at 11:42 PM

You may have to adjust the settings.

What settings do you have now? What batteries do you have?

Answer 2 · 2021-02-21T00:09:59Z

jdsilwones answered · Feb 21 2021 at 12:09 AM

12V 390 Ah

charged voltage 13.2

tail current 3%

detection time 3 minutes

7

Matthias Lange - DE ♦ commented · Feb 21 2021 at 6:03 AM

What kind of batteries do you have?

Try to set the"charged voltage" higher.

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jdsilwones commented · Feb 21 2021 at 6:45 PM

Thank you for the reply. The batteries are AGM, but that really doesn’t matter in this case. I realize I can set the charged voltage high enough to prevent the shunt from resetting the SOC, say 15 V, but that defeats the purpose of the SOC feature. I was hoping for a solution that wouldn’t require that.

again, thank you for your help

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seb71 jdsilwones commented · Feb 21 2021 at 6:54 PM

but that defeats the purpose of the SOC feature

No, it does not. The SOC will still increase as you charge the battery and can still reach 100%, even if the automatic synchronization of SOC to 100% does not happen.

The purpose of automatic synchronization is to correct any "drift" between the displayed SOC and actual SOC that happens over time (because of not perfectly accurate measurements and coefficients).

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jdsilwones seb71 commented · Feb 21 2021 at 7:08 PM

Yes, I’m sorry, I didn’t mean the batteries wouldn’t charge, just that the automatic sync wouldn’t occur, just as you said. This leaves a manual syncing my only option. Victron folks are smart, they must have thought of this issue. I’d guess a large percentage of users of this device include solar charging In their systems. Boaters like us.

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seb71 jdsilwones commented · Feb 21 2021 at 7:14 PM

As I explained, automatic synchronization does not have to occur each day. And yet, SOC can still reach 100% each day (with enough sun).

You still have to use reasonable settings for utomatic synchronization of SOC to 100% , so that it can occur, but better to occur less often than too often.

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jdsilwones seb71 commented · Feb 21 2021 at 7:24 PM

Please explain what reasonable settings would allow automatic sync of the SOC when using solar. During intermittent sunshine, the charging output will look like a fully charged battery to the shunt. (Low current due to clouds, not due to saturation.) thank you

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seb71 jdsilwones commented · Feb 21 2021 at 7:31 PM

In those conditions you do not want automatic synchronization to happen.

As I explained and maybe you don't understand, the SOC is still automatically calculated. Just not automatically synchronized to 100%.

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Tell me what are your charger settings.

Based on those you can set up the shunt.

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Answer 3 · 2021-02-21T19:21:47Z

klim8skeptic answered · Feb 21 2021 at 7:21 PM

How to set up a battery monitor.

A good tutorial for those who forgot to read the manual.

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My solar array can trick the smart shunt into thinking the reset of SOC to 100% has been reached. Are there any fixes to this?

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My solar array can trick the smart shunt into thinking the reset of SOC to 100% has been reached. Are there any fixes to this?

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