Solar Panels in series question

[naturesgrasp]

I recently got the Aptos DNA panels Will mentioned in his video and was setting them up for my off grid system. I tested the voltage of one panel by itself and it reads around 35 volts and 5 amps. I hooked 9 of them in series and test the voltage and amperage on the unconnected wires and it reads around 335 volts and 50 amps. Is this because there is no load? The only connection for the two ends of the series string is the multimeter probes. I'm confused. In series the voltage should increase but not the amperage correct? I tried looking here on the forums but couldn't find anything on this so sorry If this has been asked or discussed. Thanks.

 

[45North]

Can you post a pic of the sticker on the back?
The open circuit voltage should be listed.

 

[naturesgrasp]

They are bifacial and dont have a sticker. This is the spec sheet from the pdf for the panels

 

[naturesgrasp]

They are the 370W panels on the right. It is over 100 degrees Fahrenheit outside also.

 

[timselectric]

It doesn't sound like you are testing amperage correctly.

 

[naturesgrasp]

Im using this multimeter from amazon. To measure the voltage and amperage i'm sticking the probes into the mc4 connectors directly. It is set to DC amperage when Im checking the amperage

https://www.amazon.com/gp/product/B08MTCMWLB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[BentleyJ]

Voltage seems correct for a panel with current flowing but a single panel should produce almost 11A

 

[naturesgrasp]

That was my thought also. The panels arent at a good angle for this time of year I have them at about 45 degrees and facing approximately south so that in January I will get more out of the panels.

 

[BentleyJ]

Im using this multimeter from amazon. To measure the voltage and amperage i'm sticking the probes into the mc4 connectors directly.

Amperage is checked with the clamp. Voltage is checked with the probes

 

[BentleyJ]

@timselectric is never wrong. LOL

 

[naturesgrasp]

Oh ok. I was under the impression you could check amperage with either the probes or clamp as long as it was within the specs of the multimeter.

 

[timselectric]

@timselectric is never wrong. LOL

I'm wrong quite often. I just hide it well. lol

 

[naturesgrasp]

Does checking amperage with the probes only work if it is parallel to the circuit?

 

[BentleyJ]

Not familiar with that particular meter but generally that type doesn't have any amperage testing ability using the probes unless it has a high precision MV scale that the clamp would not read well.

 

[ohmboy]

In series the voltage should increase but not the amperage correct?

Correct.