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Deye Inverter, 80% voltage drop on switching on the PV switch. Is there any setting which must be changed?


MichaelV37

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Initially it measures the open circuit voltage. This is without any load on the panels. Once turned on it will pull the voltage down by allowing current to flow. The MPPT controller will dictate this voltage set point to maximise current flowing given the amount of light hitting the panels.

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2 minutes ago, Michael37 said:

on the Deye inverter, which setting can be set to get the maximum voltage and current? 

 

There is no setting for this. This is the basic function of the MPPT controller (hardware). Meaning this is what it is designed and built to do. It 

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image.thumb.png.8086a591ceb0cfa47448bf7a11b5c0d9.png

Here is a picture. Notice how the blue (voltage from panels) goes down as the current (orange) increases. By midday my 15kWh battery bank is fully charged. The voltage shoots up by nearly 30V as the current falls to zero. The spikes later in the day is the geysers and the pool pump and other loads turning on and getting powered by the panels. Consequently voltage gets pulled down and current goes up again.

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7 minutes ago, Michael37 said:

but the voltage dropping from 400v to 80v is not correct, the inverter  does not show the PV at all.

This is totally abnormal for voltage to fall more than about 25%

If it drops to 80V it is too low for the MPPT so it could show no PV as you mention. 

Edited by Scorp007
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11 minutes ago, MichaelV37 said:

IMG_20230328_185615.jpg

You have some serious issues here, Your battery cables are way too thin. The MPPT is wired wrong the black wire needs to be moved one slot left . The ct coil should not be in the inverter . You have no earth neutral bond relay . Your AC wires look too thin aswell.

Edited by Nexuss
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1 hour ago, Nexuss said:

You have some serious issues here, Your battery cables are way too thin. The MPPT is wired wrong the black wire needs to be moved one slot left . The ct coil should not be in the inverter . You have no earth neutral bond relay . Your AC wires look too thin aswell.

I think you are making a mistake. The 2 wires to the MPPT are correct. 1st you get the 2xpos then 2xneg for MPPT1. Then the same for MPPT2. 

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MPPT is wired correctly. Likely cause of the reported issue is a poor connection (high resistance) somewhere in the panel string.

Agree on the rest: CT coil over there is definitely going to screw up power to non-essential loads (will not work at all).  Battery wires look like someone wants to light a bonfire. And AC wires certainly look too thin too. Lack of N-E bonding is a big safety issue.

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