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bw32056 asked

MPPT 100/30 reading voltage different than BMS and BMV

Having installed and tested a MPPT 100/30 into a LifePo4 200amp Victron battery. Mppt and bmv were showing the same battery voltage.

Today the MPPT is showing it it hits float voltage of 13.5 but BMS CL 12-100 and BMV show 13.14v. As a reault the MPPT is changing to float. So I changed settings to float 14.2 to see if it changes back to bulk

On doing the MPPT immediately changed the battery voltage from 13.5 to 14.2v. Attached are Screen shots. Firmware is up to date v 1.50

Is there away to re-install software. Reset factory defaults then changed settings but didn’t change problem


MPPT SmartSolar
a4316e48-3af7-4483-84f8-833321ae6283.png (137.5 KiB)
006e115b-c194-4ce2-b7ed-66faaa8310b1.png (212.0 KiB)
ea184452-6a60-4cc5-8030-1cc1e2737464.png (163.7 KiB)
5dd47f1e-ba8b-414f-9560-623101546a35.png (172.7 KiB)
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Jesse avatar image Jesse commented ·

How far is the MPPT from the BMV? I've had similar voltage reporting issues in a system with two MPPTs but its only ever the one furthest from the BMV (about 3 metres through wooden walls) that gets it wrong.

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wkirby answered ·

It seems like the MPPT is disconnected from the battery somehow, open fuse or a bad connection. For the MPPT to jump immediately to the target Voltage that you set is an indication that there is a disconnection somehere. Also, if the battery Voltage didn't move at all when changing float to 14.2V means that there is a disconnection, you should have seen an increase in charge current too.

The MPPT will go straight to it's target Voltages with no battery connected at all.

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