question

leetpro avatar image
leetpro asked

Quattro 15kva battery terminals short during Loadshedding

Background : we have blackouts in South-Africa (Loadshedding), power is cut for 2 hours at a time in my town (Nelspruit), depending on the stage between 1 and 4 times per day currently.


I bought the Victron Quattro 15kva with 28 panels, 2 mppts, cerbo gx, color screen, smart shunt and 2 x 10kwh Lithium batteries. Was installed by a Victron accredited installer.


The purchase was made to avoid Loadshedding and not be affected by it.


Between every 3rd and 6th time the inverter will shut down completely, whether my loads are 200, 1200, 2000 or 4000 watts, doen not matter if the batteries are 70, 90 or 100%.

If it's during the daytime it will start up again within 2 minutes if there is sufficient sunlight. During nighttime it wont come back on at all until the grid power is restored.

There is a short on the battery terminals so the batteries goes into protection, It won't turn back on again, even if I turn the unit off and on, only when the grid come back it will turn on.


The installer updated the firmware to the latest version.

He set the cut off voltage to 210v to not follow the grid down for a "brown out"

I cannot replicate the problem by turning of the main grid power, then the inverter switches without issue.


Any help would be appreciated

MultiPlus Quattro Inverter Charger
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

4 Answers
leetpro avatar image
leetpro answered ·

Im really fed up with victron, going to ask my installer for my money back, keeps on saying nothing wrong with the machine , there is also a short on the AC out 1 , video on the next post




whatsapp-video-2022-12-08-at-191451.mp4 (1.3 MiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

leetpro avatar image
leetpro answered ·

Short on AC out 1 , it trips the incoming main breaker




whatsapp-video-2022-12-08-at-191528.mp4 (1.1 MiB)
whatsapp-video-2022-12-08-at-191557.mp4 (2.2 MiB)
9 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Kevin Windrem avatar image Kevin Windrem commented ·
The internal transformer is across the AC output so you can expect a low resistance between these output terminals.

You can also expect low resistance across the battery terminals since there is a large capacitor across these terminals. It would take a very long time for a multimeter in ohms or beeper mode to charge this capacitor.

1 Like 1 ·
Show more comments
nickdb avatar image nickdb ♦♦ commented ·

If your installer is really “accredited” they will return to solve your issues.

Those are seriously thin looking wires for a 15kVA, and they seem to have been doubled up to the inverter terminals.

How exactly did they demonstrate their “accreditation”?

It does not look like it conforms to wiring guides.

What batteries are these?

Is there a wiring diagram?

Looks like you need a second opinion on that installation.

1 Like 1 ·
Show more comments
Alexandra avatar image Alexandra ♦ commented ·
@Leetpro

Battery cables are undersized. For a 15kVa I would expect some fatties there. At least 95mm²x 2 on each positive and negative terminal.

So not installed according to manual. Wonder if the battery undersized...?

1 Like 1 ·
Show more comments
shaneyake avatar image
shaneyake answered ·

"There is a short on the battery terminals so the batteries goes into protection, It won't turn back on again, even if I turn the unit off and on, only when the grid come back it will turn on."

The multimeter is detecting a short because the capacitors are empty, this is normal.

Quick note on this, this is pretty normal, even with high quality packs like the FreedomWon Lite the battery will trip due to the huge inrush currents. It is recommended to always start the inverters from Grid or Solar if possible. You need to turn inverter off on its little switch and make sure fuses or DC breakers are on, turn the grid on or mppts and wait 30secs or so for the bus to charge up before turning on the batteries. Once everything is on you an turn on the inverter.

But basically the problems you are facing are because the inverter you have is wayyy to big for the batteries you are using. This isn't Victron's fault, this is your installers fault. Cables are also wayyy to small for 15kva as everyone has pointed out.

5 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

leetpro avatar image leetpro commented ·

are 2 x 10kwh lithium batteries too small ?!

the battery cables are 35mm2

0 Likes 0 ·
nickdb avatar image nickdb ♦♦ leetpro commented ·
That’s capacity. It is about discharge current. Those batteries are underpowered for your inverter. You would be better off with 4 x 5kWh.
1 Like 1 ·
Alexandra avatar image Alexandra ♦ commented ·

@Leetpro

Yes the cabkes are too small. A 15k inverter can draw 312A from the battery. So 2x 95mm² cables for neg and pos each. And a battery bank that can at minimum supply that current. Check the manual it is all there.

35mm² is rated at best for 100A.

Any installer worth their salt would have at least followed the manual.

img-20221209-wa0000.jpg

0 Likes 0 ·
img-20221209-wa0000.jpg (82.4 KiB)
leetpro avatar image leetpro Alexandra ♦ commented ·

3ddfcdb2-9036-4e19-a631-86bd3d0fb39b.jpegso I think I might have found the problem, the negative cables are conected to each other.

Only one cable going to inverter






0 Likes 0 ·
68ffe525-3210-4278-8368-0bda3fa87267.jpeg (2.8 MiB)
shaneyake avatar image shaneyake leetpro commented ·

Wow... Who is the installer? This is shocking and actually unsafe... A complaint should be submitted to Victron to have them removed as an installer.

1 Like 1 ·
leetpro avatar image
leetpro answered ·

ce045674-c971-4ab9-aac5-b3f8ea5d6500.jpegCan these 125A fuses be too small/not letting enough current through?


ce045674-c971-4ab9-aac5-b3f8ea5d6500.jpeg (1.9 MiB)
4 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

nickdb avatar image nickdb ♦♦ commented ·

This community cannot help a bad installation. Contact the listed professionals in your area and get someone experienced to help you.

3 Likes 3 ·
andricuss avatar image andricuss commented ·
Hi, could you sort out the problem? I am also from South Africa and have the same problem. 2x 15kva, 4x11.2kw revov batteries, if power goes off at night, sometimes, the batteries trip out, and I have to disconnect the inverters from the batteries, reset them (batteries), and excite one inverter at a time. This takes about 20+ attempts of resetting the battery bank and trying to charge up the capacitors. The first 5 or so only charges up the mppt’s.


Is the battery bank too small? What did you find with your installation? Please contact me 0827713040 if you got an answer for the problem. I have two other similar systems, working 100%, but with larger battery banks. This battery bank can supply 600A, but its almost like it is not enough? Will check cable diameter in the morning, but think it is to specifications.


They are all linked up in 2x lynx distributor boxes, and no shunts or anything. MPPT’s are 2x 450/100’s.

Thank you

0 Likes 0 ·
Alexandra avatar image Alexandra ♦ andricuss commented ·

@Andricuss

The 4x Revovs are definitely not capable of starting up the inverters. You need a bank capable of 625A continuous.

And the precharge on those revov are not good, so a precharge circuit/procedure/resistor as well.

0 Likes 0 ·
andricuss avatar image andricuss Alexandra ♦ commented ·
Thank you Alexandra. I installed another battery yesterday, and things are looking much better. The 5 x11.2kw batteries can now supply 750 amps. Thank you!
0 Likes 0 ·