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Kobina Obu Beecham avatar image
Kobina Obu Beecham asked

High DC Ripple after Installing New LiFePo4 battery

LoUpgraded to my 1st LiFePo4 battery after 9 years and 3 sets of Gel batteries.
System works perfectly except that occasionally the system restarts and connected loads lose power.
System is restored usually within a minute.
Manufacturer doesn't specify Absorption Voltage so I dont know where in VE Configure 3 to insert Absorption Voltage.
Manufacturer specified Bulk Voltage but I dont know where in VE Configure 3 to type in Bulk Charging voltage

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Done some reading on the High DC ripple and my question is exactly what voltage settings do I need to configure in VE Configure 3 to prevent the batteries BMS from kicking the Inverter off occasionally?whatsapp-image-2024-04-28-at-114554-am.jpegLogs from Inverter. Not all were logged but at least this incidence was logged
whatsapp-image-2024-04-28-at-114420-am.jpegThe new liFePo4 Batterywhatsapp-image-2024-04-28-at-114518-am.jpegAlarm message I received from the VRM Portal

Multiplus-II
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klim8skeptic avatar image klim8skeptic ♦ commented ·
@Kobina Obu Beecham One thing of note about your battery specs.

The label on the shipping carton list the battery as 5KWH.

The maths does not add up. A 25.6v, 100Ah battery gives a capacity of 2.56 KWH.

Make sure you operate your battery discharge as 2.56 KWH.

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JohnC avatar image
JohnC answered ·

@Kobina Obu Beecham

The battery's Bulk V means the same as Victron's Absorb V. Float same on both. See what happens when you set to recommended values.

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Alexandra avatar image Alexandra ♦ commented ·

@Kobina Obu Beecham

Bulk/absorption is definitely set a bit high there, the battery is trying to say 'no more, thanks'.

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Kobina Obu Beecham avatar image
Kobina Obu Beecham answered ·

Thanks for the suggestions.
I have noticed that when I make the ff changes:
Absorption Voltage = 27.8V
Floating Voltage = 27.5V
VE Configure automatically sets the battery type to "no corresponding default"

screenshot-2024-04-29-111038.png


When I click on battery type and choose Lithium Iron Phosphate, the software automatically modifies the settings to:
Absorption Voltage = 28.4V
Floating Voltage = 27.0V

screenshot-2024-04-29-110025.png


I am going to ahead and create a new battery type to upload into the Multiplus. Hopefully this should adapt the Multplus to charge this particular battery accordingly.
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Is it safe to upload this configuration into the Multiplus? Should the Charge Curve remain Fixed?


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JohnC avatar image JohnC ♦ commented ·

@Kobina Obu Beecham

Yes, that should be ok. A 1hr Fixed Absorb time is fairly typical, but these little details should be checked with the battery supplier when you get a chance. They're the ones holding the warranty..

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Kobina Obu Beecham avatar image Kobina Obu Beecham JohnC ♦ commented ·

Thanks so much everyone.

Uploaded the configuration, the Multiplus accepted it and the system has not gone off since the change. I think it always happened when the battery charge level crossed the 95% threshold.

screenshot-2024-04-29-135133.pngOnce again thanks everyone.
Victron sure rocks

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