question

drogos avatar image
drogos asked

Quattro making buzzing sounds

I have bought a used Quattro. It seemingly works, but some times it starts to make bad sounds. I tried connecting it with only 50mm dc cables straight to multiple different batteries with no ac connected. Sounds is the same. How ever if it is off for a little it tends to go away again. I made two recordings of the sound: https://www.youtube.com/watch?v=NmyPadE7vqY and https://www.youtube.com/watch?v=CDWX25yAMjA This is not a wiering / battery / ac issue. Any idea what this could be?

MultiPlus Quattro Inverter Charger
3 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.

Alexandra avatar image Alexandra ♦ commented ·
@Drogos

By 50mm² DC cable is right you mean 2x 50mm² neg and pos?

Have you switched on with AC in and AC out disconnected/isolated completely? Does it make the same sound?

Have you measured the voltage output of the terminals? Is it correct?

0 Likes 0 ·
Show more comments
2 Answers
nickdb avatar image
nickdb answered ·

Sounds like a load that has a dodgy power supply that only uses part of the sine wave.

Were any loads connected? It so, what?

1 comment
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.

drogos avatar image drogos commented ·
Tested it with both loads connected and disconnected. Tried connecting a freeer, a latop, a pool pump, all the same. Sounds sometimes is there, other times not. Tried with AGM batteries as well as lithium batteries. Also have a Phoenix 3kva on another system. Swapped these, and Phoenix never have issues, Quattro always end up buzzing from time to time.
0 Likes 0 ·
Sarah avatar image
Sarah answered ·

Hi @Drogos really hard to tell what the noises could be from. From a troubleshooting perspective have you tried updating the firmware on the Quattro. It may not fix the problem but it rules the firmware out as the source of the issue. Please be aware that doing the update will erase the config of the Quattro.

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.