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alator asked

MPPT VE.Can 250/100 rev2 Output low

Hi All here is my setup:

2 x Quattro 48/15000/200

1 x SmartSolar MPPT VE.Can 250/100 rev2

1 x 6kw Solis

3 x 200a/10kwh Rosen power wall with inbuilt BMS

35 x 390w panels (15 connected to MPPT & 20 connected to Solis)


I am told my panels are in strings of 5 on two separate roofs eg 3 strings of 5 making 15 panels on MPPT. I am finding that the 15 panels to the MPPT is roughly 25% of the output of the 20 panels connected to the Solis inverter. I am getting no response from my installer.

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Both roofs are similar pitch and facing same direction there is no shading on either. The MPPT is always at around 25% of the solis inverter. Which is lower than what i had expected with a 5 panel difference.

Can anyone here help me understand if this is correct or suggest what i should look at?


Update: The company who installed have informed me the original installer has left them and a new engineer came out on 15th September. He confirmed that what i was told previously was incorrect there are 2 strings (6 panels and 7 panels) connected to the MPPT. He tested both and saw that both output the same Voltage and current to the MPPT. Disconnecting 1 string had no impact on the power generation of the MPPT but he could see voltage on the string when testing it.

I am now being told that they need to confirm that the MPPT has enough trackers to handle 2 inputs. I checked the VRM as to the exact model of the MPPT:

1663748432134.png

I do not understand what is meant by trackers as this appears to be the largest MPPT Victron offers and has enough input ports for more strings to be connected than the 2 i have connected. This seems to confirm that I am generating 50% of the power due to 1 string not being used but the question remains how can this be fixed?

Thanks

MPPT Controllers
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2 Answers
alator avatar image
alator answered ·

Hi all,

so the answer to this was due to a poor quality install. The installer finally came out and checked the wiring and found that 10 of the 15 panels connected to the MPPT were not correctly wired. Once they fixed the wiring the output is on par with the Solis inverter.


thanks

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Alexandra avatar image
Alexandra answered ·

@Alator

The favourites for this usually are (besides not actually having the correct settings):-

1. BMS is limiting the charge (not sure it applies in your case) I assume it is not Can or otherwise connected to the system.

2. Limit by DVCC for system charging.

3. Charge controller is limited in its own settings i.e. 100A set to 50A

4. Controller is too hot due to installation placement.

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alator avatar image alator commented ·

Thank you for the information.

I can confirm it is not hot as it is out in the garage and today is cool. I checked the charge controller and it is set to 100A.

If i look at the DVCC setting via the Cerbo GX unit or remote console it shows DVCC is turned on with only SCS enabled. I do not know what that means though.

1659540081870.png The battery BMS shows as connected1659540275273.png1659540316749.png

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