Bad Installation

[jason121]

I was asked to write a report today regarding a poor solar installation.
There are two inverters. The left is wired out the dead side of a shared AC isolator while the other inverter is wired of the live side (from the meter ) feeding another AC isolator.
In my opinion one inverter would feed back into the other this way.

Also do the Samil inverters have much earth leakage to cause nuisance tripping if two wired in parallel. Samil technical couldn't answer that question today.

Any thoughts

thanks Ja

 

[jackhammerJIM]

Its not clear from the pictures and description but sounds like a radial circuit with 2 ac isolators (nothing wrong with that ) what size is the ac supply ? what size array ?

The inverters won't feed into one another .

Cant comment on the nuisance tripping . what are the ocpd characteristics ?

 

[jason121]

Its 2kw pv.1kw east and 1kw south. If I fit more than 1inverter I always sub fuse each inverter. Best practise for isolation and fault finding. Ocpd not fimiliar with that. They have blown 4 inverters up so far. So there is a fault some where

 

[jackhammerJIM]

Over Current Protective Device .

What size is the ac supply cable ?

 

[jason121]

B16 with 2.5mm feeding meter split with 1.5mm flex from isolators

 

[Leesparkykent]

B16 with 2.5mm feeding meter split with 1.5mm flex from isolators

sounds like a pile of dog turd! How long is the AC run roughly?

 

[jason121]

1 meter max, not long. no problems with voltage rise.

 

[jackhammerJIM]

Its only a 2kw system Lee. Agree on it sounding dodgy though .

Have you done any testing ???

 

[jason121]

Yes panel strings are ok. AC good except the wiring dodgy. These a 1100TL samil inverters.

 

[TJ Anderson]

Love the DC launched over the ridge tile SKY TV Style

 

[Leesparkykent]

Love the DC launched over the ridge tile SKY TV Style

Haha I didn't notice that until you pointed it out, I wonder if he left the job on his horse swinging his lasso like he did with that dc cable lol.

 

[shanky887614]

why didnt they use a proper inverter? you can have multiple strings feeding an inverter?

at only 2kw its only 1kw per string or 4 x250 watt panels per string.

one of the companies i did work for usually did around 10 per string (cant remember exact it was about 3-4ish years ago)

 

[Leesparkykent]

why didnt they use a proper inverter? you can have multiple strings feeding an inverter?

at only 2kw its only 1kw per string or 4 x250 watt panels per string.

one of the companies i did work for usually did around 10 per string (cant remember exact it was about 3-4ish years ago)

Yes like a dual MPPT inverter

 

[jason121]

East and south facing arrays. Im not sure if there is one small enough

 

[whinmoor]

East and south facing arrays. Im not sure if there is one small enough

There probably wasn't when that job was installed so the 2-inverter solution was probably the only option. Nowadays an option might be the Hosola Bright 2000MTL.