Sun Inverter drops to 0 volts DC when power on.

[aonavy]

I got a got a weird question. I have the 2000w/240/2 phase inverter connected to 2x305w panels in series. When i connect the panels and turn on the inverter, voltage drops to 0. Turn the power off, voltage jumps to around 86v. Its almost like the inverter is killing the voltage. series or parallel it doesn't matter. Thoughts?


Panels

• Rated Power (Pmax): 305W
• Maximum Voltage (Vmp): 36.3 V
• Maximum Current (Imp): 8.41 A
• Open Circuit Voltage (Voc): 44.8 V
• Short Circuit Current (Isc): 8.97 A
• Maximum system voltage: 1000V (IEC) /600V (UL)
• Max Fuse Rating: 15A
• Dimensions: 76.93 × 38.7 × 1.57 in
• Weight: 50.7 lbs

 

[42OhmsPA]

Are you 100% certain polarity is correct?

 

[aonavy]

Are you 100% certain polarity is correct?

I was thinking that as well. I could double check this. let me verify

 

[Mattb4]

Double check all your connections. You can show voltage with a bad one that drops to nothing when the SCC attempts to draw current.

 

[aonavy]

Are you 100% certain polarity is correct?

Cables look good! there not mixed up/swicthed

 

[aonavy]

Double check all your connections. You can show voltage with a bad one that drops to nothing when the SCC attempts to draw current.

connection look good. Its a very basic setup at the moment. panels to cut off switch (outside) to cut off switch (inside) to inverter. I tested the volage at all stages.

as soon as turn on the inside cut off switch, voltage drops to zero.

 

[Mattb4]

Could you post photos of your two cut off switches and the connection to SCC?

 

[aonavy]

Could you post photos of your two cut off switches and the connection to SCC?

I used two of these. pretty straight forward

https://www.amazon.com/gp/product/B0B2LGDRNN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[Mattb4]

Those grid tie inverters are unreliable and do not meet US standards for interconnect. Sorry but I see no point in further troubleshooting.

 

[aonavy]

Those grid tie inverters are unreliable and do not meet US standards for interconnect. Sorry but I see no point in further troubleshooting.

I’m not feeding the grid

 

[Mattb4]

I’m not feeding the grid

Without grid they do not work. Even if they claim zero export they still need a grid to function.

 

[aonavy]

Without grid they do not work. Even if they claim zero export they still need a grid to function.

Thanks

 

[aonavy]

I got it! The switch cable were backwards. I figured since it came from the factory like this it was good. Guess not