what to charge to commistion a pv system for roofer, thoughts on solar tiles

[judgeelectrical]

Hi Guys,

I am newly MCS accredited and have had a roofer approach me and ask me to install and commissiong a pv tile system(tiles are c21e solar tile, from solar centuray). It has 2 invertors, one invertor for18 of the tiles at 47 watt each and the other invertor for 12 tiles at 47 watt each.The 18 are west facing and the 12 south. I suspose i have a few questions, so here goes.

would you use 2 seperate 4mm cables to each invertor or just one and and isolate that ,
would you have all tiles on 1 string for each invertor, or a row of tiles per string (what advatages /disadvantages are there)
has anyone used these tiles
and what wuold you charge

I have a lot to learn , and would appreciate feed back

Chris

 

[SolarCity]

You should run each inverter off a seperate CB in the CU.

As for the string connections, which inverters are you using and are there any shading issues at the site?

 

[judgeelectrical]

there are no shading problems. Why would you use different strings, do they over ride each other? The invertors are a sunnyboy 1200 and a small one i had never heard off somthing 600 ( looks cheap and chinese)

 

[dansk]

( looks cheap and chinese)

Love this quote - nice one - if it looked cheap and was Japenese would it be any better? bearing in mind most of the stuf in our homes today comes from China.

I would ping Solarcentruary an email and ask them for the design, chances are they have already quoted this for the roofer and will have all the design spec on file.

 

[judgeelectrical]

No it wouldnt be any better , it would just be cheap looking and Japenese.Plus how do you know most of the stuff in my house comes from China ? or is it you with pre set ideas about chinese things?

Any way back to my questions, i will 'Ping' an email to solarcentuary and see what they say (hopfully not a chinese ping),

Thanks for your in depth reply , which has answered all my questions

 

[Graeme Harrold]

The reason for splitting into strings is to combine and add V and A to get the best out of the inverter. At 47W per tile, you are probably looking at 1 possibly 2 strings depending on the operating voltage parameters of the inverter and the voltage output of the tiles.