Quattro 12/5000 Connection and Power PCB keeps on blowing?

Unit is located in an enclose box with holes and exhaust fans installed around it. The Connection and Power Pcb of the unit have been replaced once with the same configuration from where it was installed in New Zealand. The same problem happened and then the unit was repalced with a totally new unit and then the same thing happened again. Connection and Power pcb is broken.

What could have been the issue here?

Looking forward to an open discussion.

2 |3000

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Alexandra ♦ commented · Apr 05, 2023 at 04:55 AM

@JONI RAVAI

To help diagnose that depends on how it was broken. Or what components failed.

Was it mechanical damage? Or electrical?

Often it is DC ripple on the power board, so related to undersised cable or battery.

Do you just have unsupported cables just hanging out?

Just guesses right now. Pictures of setup and more details would help. Also the repair centre you are working with should ve abke to explain more.

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JONI RAVAI Alexandra ♦ commented · Apr 26, 2023 at 03:15 AM

Hi Alexandra. Thank you for your response. The battery cable size used is 2 X 70mm cables. Which means 2 X 70mm for the negative and 2 X 70mm for the positive.

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Alexandra ♦ JONI RAVAI commented · Apr 26, 2023 at 07:40 AM

70mm² can carry 100 ish amps comfortably. Without voltage drop.

Sounds like heat is also a consideration. So uprate the size even more.

2x means 200A of current. 5000÷12 is 416A. So you need double the cable currently installed minimum.

Check the manual for the inverter.

You must be seeing pretty bad voltage drop under load and very likely DC Ripple.

In the case for DC, bigger is always better. Especially on longer runs like yours.

Or just switch up to a 24 or 48v system, that would be way more efficient.

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nesswill commented · Apr 05, 2023 at 05:22 AM

If in an enclosed box even with holes and fans it could still be over-heating (just not enough airflow), do you have a temp sensor in the box or can you measure the temp?

as Alexandra says some pictures please...

i note from another post of yours "Blown Capacitor on output of 24V- 375W Phoenix Inverter" if on the same setup as Alexandra says DC ripple could be the cause of your issues or did you solve it?

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JONI RAVAI nesswill commented · Apr 26, 2023 at 03:19 AM

https://youtu.be/oLxCYnMvx8s

Please follow link to check out the video of how the system was setup by the original installers, Marine Electrics in Auckland, New Zealand, before we changed the connection PCB and also the new inverter.

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