question

dirkmuc avatar image
dirkmuc asked

MPPT 75/15 showing -1W

Hello,


I have a question wrt the output power of my 75/15. after sunset the power goes to -1W.

How can this happen? The solar panel is hopefully not consuming energy....

Has someone any idea?

Cheers

Dirk



MPPT SmartSolar
minus-one-watt.jpg (19.8 KiB)
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Alexandra avatar image Alexandra ♦ commented ·

@dirkmuc

To troubles shoot, can you unplug the panel and see if it changes? If it does then you know it is the panel.

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1 Answer
lklmenterprises avatar image
lklmenterprises answered ·

Is that coming from the BMV? or Venus device?


It isn't the Solar panel draining power, it is the MPPT itself, it will be drawing a small current for it's own circuitry (such as Ve port, reporting, etc.) and that is how you are even getting those figures, presumably it is connected to a Venus GX or similar in order to get your reporting. I'm surprised it shows so little.

My system draws a stead 11w all the time, but is inclusive of:

1 x Venus GX on raspberry Pi

1 x Battery Shunt

1 x Batter Isolator

1 x MPPT 100/50

1 x EasySolar in Charge Only mode (just so it continues to report to the Venus.)

Also the reason it shows in your Solar PV Yield - is likely that in your Venus GX you have your Solar MPPT set as the Battery Monitor.

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