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david-prentice asked

Battery not charging above 54v

I have system that will not charge the battery above 54v. Both the MPPT and charger settinga are set to 56v (absorption) , 55.5v (float).
I've tested the settings with running charge for many hours and tested the MPPT. At the moment I am unsure if the problem resides in the Victron of the Daly BMS?

MultiPlus-II 48/5000/70-48
Cerbo GX
SmartShunt 500A
SmartSolar Charger MPPT 150/35
Daly 16S BMS - LifePo4 Eve cells


I have checked the settings in VE Configure and the MPPT (VEconnect). is there any thing i can try to get a higher charge voltage?



Multiplus-IIMPPT SmartSolar
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JohnC avatar image JohnC ♦ commented ·
@David Prentice

Is your battery still accepting current?

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david-prentice avatar image david-prentice JohnC ♦ commented ·
Yes, the battery is charging with no problem. It always flatlines at 54v when charging for the DC alternator, MPPT, or shore power. It has never gone above a charge of 54v since install.


VE Configure Charger settings:

Charge curve: fixed

Absorption: 56v

Float: 55.5v

Current: 70A

Absorption time: 1 hour


MPPT set to: 56v max

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3 Answers
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Michelle Konzack answered ·

Your values

56v (absorption) , 55.5v (float)

look very odd. AFAIK the

ABSORBTION must be HIGHER

or the

FLOAT be LOWER.

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david-prentice avatar image
david-prentice answered ·

Thanks for the response, the absorption is higher than the float. Am I missing something?

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Michelle Konzack answered ·

The difference between ABSORBTION and FLOAT is only 0,5V which can lead to this error.


Please read the Datasheet of your Batterie and correct the values accordenly.

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Related Resources

MultiPlus-II Product page 

MultiPlus-II Manual

Multiplus-II GX Online Manual

MultiPlus-II 230V Datasheet 

VE.Bus Error codes

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