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willemoud avatar image
willemoud asked

2 Multiplus in parallel - failed shortly after powering on

The installer installed 2 multiplus in parallel (2x 5KWh), but 2 minutes after powerup, the 'master' inverter 'blew up'. I need to know if the installer has followed the correct methods. He is not experienced with Victron. Is there an expert I can show diagrams or an install manual I can refer to specifically for parallel connections ?

Multiplus-IIMultiPlus Quattro Inverter Charger
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6 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

Just show us some pictures and/or a wiring diagram, here are many experts. :)

https://www.victronenergy.com/live/ve.bus:manual_parallel_and_three_phase_systems

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klim8skeptic avatar image
klim8skeptic answered ·

Wiring Unlimited has some useful information on parallel systems.

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willemoud avatar image
willemoud answered ·

Here are some wiring photos

1) 7 x Lithium Titinate (LTO), batteries in parallel

2) Master Victron on the right and slave on the left.
The Master (right one), burnt out after about 2 minutes from power-up. Batteries were almost full

3) SMA grid connected solar inverter with 5 solar panel strings coming in.


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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Do you have pictures of the wiring inside the inverters?

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willemoud avatar image willemoud Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

not yet, but I will try to get them.

Thanks for trying to help me out :)

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willemoud avatar image willemoud Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

If you notice the wiring coming from the batteries into the control box, you can assume the wiring lengths are NOT the same.

Is that a possible cause for the Victron inverter burning out, especially considering there are only 2 inverters in parallel ?

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willemoud avatar image willemoud Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

I now have 2 photos, but maybe they don't have the detail you are after ??

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willemoud avatar image willemoud Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Hi

willemoud avatar image
willemoud answered · 5 days ago

Here are some wiring photos

1) 7 x Lithium Titinate (LTO), batteries in parallel

2) Master Victron on the right and slave on the left.
The Master (right one), burnt out after about 2 minutes from power-up. Batteries were almost full

3) SMA grid connected solar inverter with 5 solar panel strings coming in.


dsc00038-sm.jpg (714.6 KiB)
dsc00040-sm.jpg (574.2 KiB)
dsc00007-sm.jpg (568.2 KiB)
· ·
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Hi Daniël could you please take a look at my photos and let me know if it's informative enough ?

Do you need to see the channeling ?

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

Hi @willemoud

Please have the installer fix your system, and when they are in need of help they know how to contact Victron sales for support.

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podilamaya avatar image
podilamaya answered ·

@willemoud

Did you found what made the multi plus blow up?


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willemoud avatar image
willemoud answered ·

Yes, unfortunately the installer of the 2 multiplus in parallel (2x 5KWh) did not program the system correctly.

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