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I was tightening the negative terminal tonight, using a Gedore 5 - 50 Nm torque wrench set to 10 Nm (the manual says tighten to 12 Nm). The bolt inside the inverter snapped off :-(
And this is what the other half of the bolt looks like - kind of powdery inside?
I am a little bit unhappy, since we have regular power failures in South Africa at the moment, and I have no idea how long this will take to have fixed (the inverter is less than a year old).
Hi
Note these are only 6mm tinned brass bolts, just go an buy another one and fit your self.
Note: 6mm brass bolts torque range from 5 to 8Nm range depending on the friction coefficient.
Regards
Rob D
NZ
Only the very first batch of MP-II has M6 bolts. Now they have M8.
I don't think I'd even try to replace the bolt - it is behind that little circuit board, and probably also soldered to it or something. I looked from the bottom of the inverter, and can't see how it is kept captive.
I see M.Lange mentioned below M6 vs. M8 bolts - mine has the M6 bolt, and my paper manual says max torque is 11Nm. The manual on the internet says 12Nm (but in brackets behind it M8 bolt). Could easily create some confusion!
And I was even more conservative with the torque wrench at 10Nm.
Hi Albert
As us kiwis do, we call it the number 8 wire method, just do it!! the inverter is simple in design and construction. Other wise if you stuck out in the boon docks, you can wait for ever.
Note: I do have one myself with 6mm bolts.
Regards
Rob D
NZ
Apologies for the inconvenience, but the thing to do in this case is start the warranty claim process.
Please contact your dealer, or fill in the form above. It might be able to be resolved quickly.
That torque setting is the maximum, in the future if you are going to use torque wrenches, find one with a range closer to the target, eg 1-15 Nm. In this case it could be a fault in the metal part, or the low end of the torque wrench. It is much easier to feel the natural point of tightness with a smaller tool.
Thank you @Guy Stewart (Victron Community Manager). The inverter has been handed in at the supplier here in Cape Town and they will liaise with Victron to have it resolved. I hope for quick resolution as the inverter keeps my business running during our regular rolling blackouts.
The Multiplus II documentation could perhaps be improved in two ways:
Point 1- They are the same though, the actual recommended torque is the maximum torque! Any tightening beyond that value is considered overtightened, and risks damage somewhere. Any less, and it could be tighter making a better contact and more secure connection.
I am sympathetic with your second point. All the information is there, but it is easy to overlook the model number variation, and given the significant potential for damage to an M6 tightening to an M8 torque rating, I will consider how we can make the situation clearer in the documentation. I am also open to suggestions...
Hi Guy, I am finding these posts very frustrating as it feels to me that there are some underlying issues that is not communicated or addressed. I ran into the same problem yesterday fitting new DC cables to a year old Multiplus-II 8k. Following all the training and user guides, I felt it important to follow the instructions of ensuring the terminals are correctly torqued and went ahead and checked AC and DC terminals but managed to snap of two bolts just by using the correct values, which again you highlighted as being important.
When researching the issue I am finding dozens of posts like these complaining about the same problem. I am also concerned that I have two bolts on the same unit and have never had this problem on any other unit before which again makes me think of a factory defect or if heat could of damaged the bolts.
What really bothers me is I have followed your advice of initiating the warranty process just to be told straight out even before the unit was seen by the dealer that this can only happen because of installer error and will not be covered by warranty. I now have a quote for a 1/3 of the price of a new unit, just to replace this terminal board.
it is very frustrating trying to follow all the instructions as per your training and manuals, then having a problem and be told, but you really shouldn't of followed our guidance and should of just try and feel by hand when it is snug enough.
Why is Victron and its dealers providing conflicting information and why am I being punished for following your instructions?
Hi
Is that a brass bolt? if so they have lower torque values anyway than steel bolts, also is the torque wrench being calibrated and checked not a cheapy? as thay can be a long way of in calibrated readings.
Regards
Rob Duthie
NZ
Victron posts torque values of 12Nm for DC terminals and 1.6Nm for AC terminals in the manual
The 1.6Nm is for the AC screw terminals not bolt type as the bigger units have.
Hello,
my brand new phoenix had the same Problem.
Victron replaced it without problems.
Best regards Robert
The picture of the broken M8 bolt does not appear to be brass or copper. Why is the bolt not solid? (having the center filled with some non structural material) The Victron 12Nm torque spec seems very high (even if for a brass solid bolt) compared to the steel grade 4.6 torque spec of 11Nm.
