Please help me understand

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Re: Please help me understand

Postby interested_in_solar » Sat Sep 14, 2013 8:58 pm

Sorry, i looked at the proposed quote wrong...

It has 3 strings of 4 panels to the NNE and they got 6 panels in 2 strings of 4 and 2.

I looked at their proposed diagram from google maps wrong.

That makes only 18 panels, 2 short. Hmmm, but the roof configuration has changed since that photo, i didn't own the property then and the solar hot water is gone.

So maybe once they come out to have a look, it'll be okay?

They are using:-

20 x QSE/ZC Solar 250W Polycrystalline Panels
1 x Powerone Aurora PVI-5.0 Outdoor Inverter (Single Phase)

* They do have upgrade options for me also...

I have 3 phase to my residence, should i opt of that or it doesn't make a difference?
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Re: Please help me understand

Postby davidg » Sat Sep 14, 2013 11:07 pm

interested_in_solar wrote:It has 3 strings of 4 panels to the NNE and they got 6 panels in 2 strings of 4 and 2.

Strings too short nowhere near enough voltage on any string if that's whats being suggested on an Aurora

interested_in_solar wrote:That makes only 18 panels, 2 short. Hmmm, but the roof configuration has changed since that photo, i didn't own the property then and the solar hot water is gone.

Google maps a terrible way to quote, it's good for roof orientation but that's about it.

interested_in_solar wrote:So maybe once they come out to have a look, it'll be okay?

Over the phone no one ever "pressures" it's when face to face BTW if they aren't actually either an CEC designer or installer, take everything being said with a very large grain of salt.

interested_in_solar wrote:20 x QSE/ZC Solar 250W Polycrystalline Panels

Check whirlpool for feedback on them - I've not used them at all however some the statements on there are not encouraging.

interested_in_solar wrote:Powerone Aurora PVI-5.0 Outdoor Inverter

Sun on the inverter while it might be in the morning WILL shorten the life of the display, permanent shade is the ideal.

We were putting a system on roof the other day I look across the road and there is an inverter on the north wall in full sun it looked about 20 years old I reckon it was about 2 years (An Eversolar I think it was) I'd guess not long before it bites the dust being cooked to death.

interested_in_solar wrote:* They do have upgrade options for me also...

What sort of options?

interested_in_solar wrote:I have 3 phase to my residence, should i opt of that or it doesn't make a difference?

Depending on the distributor they may want to you spread the load across phases anyway and that will add to the cost - if you have 3 phase seriously consider 3 phase inverter, Kaco, SMA <-German, Aurora is OK, and some of the better ones warranty also good and generally backed up as long as installed correctly.
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Re: Please help me understand

Postby Tracker » Sat Sep 14, 2013 11:45 pm

interested_in_solar wrote:............ 3 strings of 4 panels to the NNE and they got 6 panels in 2 strings of 4 and 2..........

I do wonder if they are GROUPS rather than STRINGS......
HOW does anyone know how panels are wired, from a installation diagram.

My garden shed has a physical 4 by 5 array roof ....
Is that five strings of 4, or four strings of five.... NO..... they are ALL in parallel.... :?
..
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