Shading on Sanyo HIT240 panels

[fiardor]

Turned up on this instal to put in inverters and found this abortion.

As you can see i have a little bit of a shading problem (11am) to say the least LOL

I have a 150 of these and they are all the same. 10 rows of 15.

Can someone tell me the ramifications as to the by-pass diodes with this amount of shading and them being in landscape?

They all have Tigo optimisers on them but they are gonna do diddly as they have nothing to optimise to!!!

 

[cbw]

OMG!!!

Think I would walk away?

 

[fiardor]

OMG!!!

Think I would walk away?

Wish i could bud but no can do.

 

[Earthstore]

Well that settles the argument, Sanyo's produce more shade than any other panel.
The cheapest panel you could buy, fitted correctly would have produced more than that.
What has the install company said? Is the customer aware that this is not acceptable? And who is the MCS with, you or the install company?
You did make me laugh though....

 

[methley]

With optimisers on each panel, the bypass diodes aren't going to do anything to help you at all. Basically if a panel is shaded it won't produce. See the plot below from my system. You can see the power curves for two Sanyo 235W modules mounted portrate. One is unshaded (apart from the passing clouds at lunchtime) and one has a hard, diagonal, shadow across it which gradually moves across the panel until it, too, is unshaded. Interestingly you can see the vertical elements of the panel kicking in as the shadow uncovers them. There seem to be three distinct jumps of power as the panel is unshaded. In your example with a horizontal shadow on a landscape panel, you might see the same jumps as each section of panel is uncovered from shade.

 

[FB.]

I though that circuits and bypass diodes, on panels with square cells, were usually arranged like this, with six lines of ten cells, and three (coloured dotted yellow) bypass diodes providing the fastest bypass route across the panel:

 

[edexlab]

Depending on the panel and I think its the 240/250's sanyo's have a different cell string configuration to most other makes ( i can't find the datasheet which shows this but will look),and instead of being of the arrangement as in your diagram with the cell strings running the full length of the module they are in 3 blocks from the top of the module down
ie where you might position a normal panel in landscape due to shade along the lower part of an array ,the sanyo would be better in portrait
As for the effect this shading would have on the diodes ,I think this is irrelevant as the layout is obviously wrong and unless thats changed then this system should not be turned on as it can only cause problems and potentially be damaging to the whole system and if it is turned on then your customer is left with 2/3rds of the system he's paid for .
the only sensible thing to do would be to widen the gap between the rows and I don't envy you the job of trying to get that to happen!
but in my view its the installing company's problem and not yours (unless it's your company of course) and nothing else you can do will solve it.

 

[series530]

The HIT250's certainly do have a very different arrangement to most. I don't know if the 240's are the same:

The 250's, considered in portrait mode, have a narrow band across the middle as one bypass region and above and below this narrow band are the other two bypass regions. Most other panels are like the graphic that another poster referred to.

 

[solarcat]

Another interesting thing about this install..the module clips are all on the short side of the modules :banghead:

This is expressly prohibited by Sanyo (as it is by most module manufacturers)!!!

 

[petex2416]

Wondered when someone would finally pick up on that!

 

[whinmoor]

Another interesting thing about this install..the module clips are all on the short side of the modules :banghead:

This is expressly prohibited by Sanyo (as it is by most module manufacturers)!!!

Does anyone know of a table showing which manufacturers allow this? Or is it even more complicated as some manufacturers will permit some of their modules to be clamped like this but not others?

 

[solarcat]

Schott Solar allow clips to be applied to the short side of any of their modules, I do not know of any others who do...

 

[petex2416]

Hyundai Mg series do.

 

[SolarCity]

To be fair, quite a lot of panel manufacturers now allow it.

Linuo panels, most Suntech panels allow it.

 

[Gavin A]

but not sanyo...

the only possible saving grace for this system could be the optimisers, but I'm not clear how they work, and am pretty doubtful that they're going to solve the issue of the shading going across all the strings in the panels.