House Battery Amp Hours

[AG3]

My Victron battery monitor does not show 100% even when the shore power cable is plugged in and the solar panel is working. It tends to show 98.6% to 99.8% but never 100%.

I'd like to check the settings on my Victron app to configure appropriately. Our 2024 R-27 has two Lithium batteries in the house bank, but I don't know their make or amperage. As you know, they are tucked away under the cockpit floor port side and I cannot read any of the info on the side of the batteries.

Let me provide my Hull Number and hopefully you have a record of the make and amperage batteries I have installed. Hull Identification: FMLT2771C424.

Also, if you have any additional suggestions about configuring the parameters from within the Victron App, I'd be happy to know them.

Thank you!

 

[Jared Dunning]

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Once the batteries are fully charged, you’ll need to set the SOC (state of charge) to 100%. It’s normal for the Victron to show 98–99% even when the batteries are fully charged. You can set the SOC in the app by going to Settings (cogwheel) → Battery, then using the “Synchronise” button at the bottom to force it to 100%. You’ll need to do this each time the batteries are fully charged. This is because the SmartShunt only tracks what’s coming into and going out of the batteries, not the total amount of energy stored in them. Your app should show the total amp-hours for the battery bank; dividing that number by two will give you the amp-hours per battery.

 

[AG3]

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Once the batteries are fully charged, you’ll need to set the SOC (state of charge) to 100%. It’s normal for the Victron to show 98–99% even when the batteries are fully charged. You can set the SOC in the app by going to Settings (cogwheel) → Battery, then using the “Synchronise” button at the bottom to force it to 100%. You’ll need to do this each time the batteries are fully charged. This is because the SmartShunt only tracks what’s coming into and going out of the batteries, not the total amount of energy stored in them. Your app should show the total amp-hours for the battery bank; dividing that number by two will give you the amp-hours per battery.

Thanks, Jared. Does the app automatically know the amperage, or is that something that needs to be adjusted?

 

[Jared Dunning]

We set the amperage (total amp hours) at the factory on the Victron. You shouldn't need to set it or adjust it.

 

[AG3]

We set the amperage (total amp hours) at the factory on the Victron. You shouldn't need to set it or adjust it.

Thanks, Jared. OK, just one more question and then I'll stop bothering you. 🙂 On two previous boats with a Victron monitor, I never had to synchronize after the batteries were fully charged. Is the reason I need to synchronize on my Ranger Tug due to the nature of the smart shunt or due to the differences between AGM batteries (two prior boats) vs Lithium on our Tug, or due to some other reason I don't comprehend?

 

[Jared Dunning]

This has to do with how the shunt works. It only measures current going into and out of the batteries and doesn’t inherently know when the batteries are fully charged.

 

[AG3]

This has to do with how the shunt works. It only measures current going into and out of the batteries and doesn’t inherently know when the batteries are fully charged.

Hi Jared:
Two questions: 1) Is the Smart Shunt a Victron product, or third party?
2) Where exactly on the boat is the shunt located? My Owner's Manual was printed about the time Ranger Tug began offering boats with a Victron battery monitor, and there is no schematic for the monitor and shunt as there are for other systems on the boat.

Thanks,

A

 

[Jared Dunning]

• The SmartShunt is a Victron product.
• It is installed inside the port cockpit hatch along the white wall next to the house batteries. You’ll see a 4/0 ground wire on each connection point. We've moved it around in that hatch area, but it is inside the port cockpit hatch.