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Old 06-07-2021, 16:07   #1
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Why does Quattro takes battery voltage from its own cable connection rather than the

We now have a full Victron Energy charging and inverter solution (smart shunt, cerbo, quattro, smart solar), plus a third party BMS and a LFP battery. On the Cerbo we have set the voltage source for all connected equipment to be the shunt. However, for charging and inverting the Quattro takes its voltage from its own cable connections (the other ends are on the positive discharge bus and negative bus) rather than the shunt.

As a consequence bulk charging doesn’t last very long and it drops down to absorption relatively quickly - usually within 15-20 minutes of starting charging. We have set absorption to 13.8V. Note that the shunt is reporting 13.5V, yet at the Quattro it is seeing 13.8V.

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Any ideas? Is this just the way the Quattro works?
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Old 06-07-2021, 21:53   #2
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

You can enable DVCC on the Cerbo and select the Smartshunt as the voltage source.
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Old 06-07-2021, 22:07   #3
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

The Quattro also has a battery sense connection that could be run to the battery. If You can’t get it to share the shunt info.
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Old 06-07-2021, 22:40   #4
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

DVCC is the right call
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Old 07-07-2021, 16:57   #5
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

Could be high voltage drops in the cabling, maybe good clean up of terminals and use lanolin or other lubricant. Make sure ss washer is not between fuse and cabling.
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Old 08-07-2021, 02:16   #6
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

Quote:
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You can enable DVCC on the Cerbo and select the Smartshunt as the voltage source.

Already done that, so that’s not the solution unfortunately.
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Old 08-07-2021, 02:21   #7
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

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Could be high voltage drops in the cabling, maybe good clean up of terminals and use lanolin or other lubricant. Make sure ss washer is not between fuse and cabling.

Only a couple months since installation and everything is tight and clean. We have SS split washers at all connections so maybe that’s the problem? So, no split washers at all or can one get copper ones?
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Old 08-07-2021, 05:07   #8
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

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Only a couple months since installation and everything is tight and clean. We have SS split washers at all connections so maybe that’s the problem? So, no split washers at all or can one get copper ones?

A split washer above the lug, below the nut is fine. Just don't put one below the lug, as it has a negative impact on connectivity.



But in general, it sounds like DVCC isn't working correctly for whatever reason.
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Old 08-07-2021, 05:53   #9
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

Measure the voltage drop while you have good load, my positive had .6 Volt more than the negative due to a ss washer inserted between the fuse and the cable lug. This voltage drop should be minimal.
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Old 08-07-2021, 07:46   #10
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

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Already done that, so that’s not the solution unfortunately.
The solution is to get it working properly because when it is you get the correct numbers.
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Old 08-07-2021, 07:58   #11
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

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Measure the voltage drop while you have good load, my positive had .6 Volt more than the negative due to a ss washer inserted between the fuse and the cable lug. This voltage drop should be minimal.

He posted the voltage drop. 0.3v with a 120a load. Hard to do much better then that. Not a cable issue.
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Old 28-10-2021, 15:17   #12
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

Posting an update. The solution to the voltage sense problem (and some funny behaviour by the Quattro charger algorithms) was to enable my BMS’s CANbus connection, as well as setting the BMS as the voltage/current/temperature sense. Now the BMS is the source of truth for all Victron equipment connected to the Cerbo and charging behaves as it should.
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Old 29-10-2021, 05:01   #13
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Re: Why does Quattro takes battery voltage from its own cable connection rather than

Thanks for the update. Glad you got it solved.
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