Multiplus residual consumption

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Nicolas asked Nov 18, '22

Multiplus residual consumption

Hello guys, thank you for the great support here in the community.

My Multiplus 12 / 800 /35 is sucking about 15w continuously even when no equipment is plugged on. 15*24h=360wh per day is quite significant in a van.

With the INTERFACE MK3-USB, I set it up as lithium and updated the software.

How much is the normal residual consumption and what could be done to decrease it, please?

My installation:

2x150ah lifepo4 ECOWORTHY batteries in //, with 3x150w solar panels in //, through Victron MPPT SmartSolar 100/50, monitored with the Victron Smart Shunt, and converter / charger Victron Multiplus 12/800.

MultiPlus Quattro Inverter Charger

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Modifications Space

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Answer 1 · 2022-11-18T10:14:04Z

nickdb answered · Nov 18, 2022 at 10:14 AM

Docs are always your friend..

Also, remember there is an mppt, shunt etc that consume. Measurement accuracy at low loads is also not great.

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Answer 2 · 2022-11-18T11:47:20Z

klim8skeptic answered · Nov 18, 2022 at 11:47 AM

Curious me wants to know if the 2 battery meters on top of the battery give accurate readings??

Just to be sure, you have used the aux port of the Smart Shunt to measure the other (paralleled) battery.?

While you have the positive fuse out, do a zero current "calibrate" on the Smart Shunt.

EDIT.

Looking further at the batteries, the batteries have not been hooked up as cross diagonal. Battery balancing is not optimal. The negative lead from the shunt has to go to the other battery.

Due to the tiny eyelets on the neg wires from the battery monitors, the larger crimps are not seated flat on the battery terminal. (neg batt post under the big red knob)

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Answer 3 · 2022-11-20T09:14:23Z

Nicolas answered · Nov 20, 2022 at 09:14 AM

@klim8skeptic

Thanks for your answer.

Exactly, I used the second port of the Smart Shunt to measure the other battery in //, is it wrong?

Actually, I don't even know where this second value is visible on the app.

Ok, done for the calibration.

Ok, I will put the tiny eyelets on top.

Ok, does the cross diagonal mean I switch the order of the 2 negatives?

The 2 battery meters on top always give the exact same value as my multimeter, found it useful for a quick check.

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klim8skeptic ♦ commented · Nov 20, 2022 at 11:49 AM

Ok, does the cross diagonal mean I switch the order of the 2 negatives?

Yes swap the lead that goes to the shunt, to the other battery negative. Wiring Unlimited manual, look at section 3.3 Parallel battery bank wiring .

The 2 battery meters on top always give the exact same value as my multimeter, found it useful for a quick check.

To check the battery voltage, they are probably ok. To check battery SOC, they are worthless. Put the effort into setting up the Smartshunt for reliable SOC readings.

Exactly, I used the second port of the Smart Shunt to measure the other battery in //, is it wrong?

Not wrong, just no point as both will read the same value. The cable to keep goes from the VBatt+ on the shunt, to the other end that connects to the batt+ under the GPO's. Keep the unused lead as spares, or use it to monitor your start battery (?). Refer Smart Shunt manuals.

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