question

Sten avatar image
Sten asked

Smartsolar mppt 100/20 and 75/10 battery voltage fluktuating

I have 1 smartsolar mppt 100/20 with 280wp 24v panel

1 smartsolar mppt 75/10 Witt 140wp 12v panel

1 bmv712 and 2 100ah lifepo4 dropin type in parralel.

My mppt chargé settings is absorption 14.2v and float 13.5v

All in a camper van and setup with ve.smartnetwork


When driving down the road and Going from shadow to sunlight the mppt fluktuating in batteri voltage when in absorption. Sometimes the voltage go over 15v.

My lifepo4 battery is disconnecting Because of this.

The internal bms is disconnecting at 14.65v

Do anyone Else experience this and is there any solution. Or it could be a bug in firmware.

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2 Answers
Sten avatar image
Sten answered ·

After some further test i found that the problem is in the ve.smartnetwork.


I have taken a number of screenshot from the BMV712 to clarifie.

First parked an with ve.smartnetwork:

Then when drivning down the road:

Then with ve.smartnetwork disconnected stil driving:

First picture is just after disconecting smartsolar from smart network.

As seen in the picture, there must be an error in the ve.smartnetwork.

Can Anyone confirm those reading of mine.


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Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

Hi @Sten

Can you please show the charge settings of both MPPT's?

also, what firmwares are you running on mppt's and BMV?

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Sten avatar image Sten commented ·

Hi

Charge settings as on picture. Firmware is the latest 1.50 on mppt's. Firmware on BMV712 is 4.03

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