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I have recently brought a solar kit. With a victon 175w panel and a victron mppt 75/15. Once installing it has worked for around 5 days. The last couple of days it produced nothing. Even though good sunny days
When looking into today I found the solar panel at 19v when testing disconnected from mppt. When introducing mppt it drops to around 13v. This causes the batteries not to charge.
Has the mppt failed?
Thanks
The Victron 175w panel should read ~23.7v when not connected (Voc) and ~19v at Vmp. Is it possible the panel is shaded?
I don't think it's shaded as I have moved vehicle during the day to get different voltages. And when it's getting dusk the voltage is less.
Why when introducing the MPPT the solar voltage drops so much ?
Thanks
Why when introducing the MPPT the solar voltage drops so much ?
Having nothing connected makes the panel run at Voc, the highest voltage it can. Connecting something like a controller will typically drop panel voltage. That is normal. The panel's voltage isn't normal.
I have moved vehicle during the day to get different voltages
Do you have a picture of this setup? Panel Voc really shouldn't change much in normal daylight. Panel current will change with different conditions.
I have also tested direct at the panel leads and voltage is the same. 19.8v
I will not discount the switch as a potential contributing factor or even a bad connection. After operation and some heat being generated, connections may be not as tight anymore, especially if the torque settings of 0.75Nm were not strictly adhered too. Is the MPPT still correctly set up for 12V?
Mppt is set up to 12v on victron connect app.
