Understanding victron connect app and smartshunt data

[hornsofallign]

Hi,

Can anybody explain these readings please. I don’t think I’m running any significant load in the van. I’m on hookup and the victron Multiplus is switched to “charger only”.

The fan on the Multiplus is running permanently (3hrs now ) and is warm and the smartshunt appears to be telling me 56 amps is moving somewhere.

The batteries (400ah) are newly installed today. Is this just them getting charged?

 

[Raul]

Yes, looks like multiplus is chugging away 50+ amps I would expect fans on at least 50-70%, or even 100% if the temp is 30+. If your smartshunt is wired correctly, then all that is absorbed by the batteries.

 

[hornsofallign]

That’s a relief. Thanks Raul. It’s a super hot day today too!

Many thanks.

 

[autorouter]

As Raul says. The '100%' isn't accurate, the Smartshunt hasn't reset yet. If it doesn't reset after a couple of charge/discharge cycles you can reset it manually, but might not be necessary, it might do that itself.

 

[Raul]

The percentage I was referring to the speed of the fans. As temp increases, even if load is low or medium low, the fans will go to 100% speed. If is low load only, fans can modulate 0-25% speed. They are not constant speed, it increases with load and temp.

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[autorouter]

Sorry about the confusion, I was referring to the big '100%' SOC figure in the display picture. Thought he might be concerned that the Multiplus is pushing charge in at full whack when the Smartshunt is saying it's 100% full.

 

[hornsofallign]

You are correct. I am confused by the 100% SoC. How can I tell how many amp hours are left in the battery, if the SoC is ‘lying’?

 

[Raul]

It will re calibrate/ synchronise when you do few full charge cycles. Have you entered the total capacity in AH for your battery? Default setting is 200ah, that needs changing to whatever you have.

 

[autorouter]

There's no magic instrument that can tell you the SOC with a single one-off measurement. A simple voltmeter will have a jolly good guess, if the battery is not being charged or drained, and has been left to rest for a few hours. Not very likely in a motorhome. The other way is to sit a meter measuring amps on a battery terminal. This measures the amps going in and out, and a chip keeps a count of the incoming and outgoing amps over time.

To tell you the SOC, it needs to know how big the battery bank is, and what its SOC is at one instant in time. Then it can monitor the flow in and out to keep track of the SOC.

The software can have a good guess at when the battery is fully charged - for example if it's been at the float voltage for several hours. But it really can't guess the size of the battery bank very well. That's why you get the menu option to tell it what the battery bank Ah capacity is. If you don't, it will use the value put in at the factory when it was made, which is about 200Ah.