Suuny Boy inverter SB3000 HF-30

SolarCity · May 28, 2012

PhilipK said:
Same roof space - 1 row of 7 above a row of 8 all south facing on a roof with 30 degree pitch
I think I understand but will the gain by running better at 2900w outweigh the loss of never achieving above 3000w

As far as my computer simulations go, it appears so.

PhilipK · May 28, 2012

No shading at all

whinmoor · May 28, 2012

[ElectriciansForums.net] Suuny Boy inverter SB3000 HF-30

Ok. Here's Philip's photo. Any comments? Looks pretty neat except for a possibly peeling label?
Looks like a single string as well.

PhilipK · May 28, 2012

Thanks that is good news.
However does this mean that the average annual system output will be less than the 3159 quoted and more like 2900

whinmoor · May 28, 2012

I'd expect your system to perform much better than 2900kWh per year. 3159kWh is the official Government SAP figure which tends to be rather pessimistic in my experience. You should do a bit better than that (assuming reasonable weather conditions of course).

I think your installer's done a decent job and hasn't "fiddled the figures".

You do have polycrystalline panels which are a bit less efficient than monos but they should work fine if installed correctly.

Gavin A · May 28, 2012

PhilipK said:
Thanks that is good news.
However does this mean that the average annual system output will be less than the 3159 quoted and more like 2900

no, I think you're getting mixed up.

the annual output is in kWh, whereas the limit on your inverter output is in kW.

They essentially are unrelated, though it roughly works out at around 8-900kWh per year per kWp of solar PV installed, which in this instance results in an annual output prediction of 3200kWh.

I'm not running this through sunny design as I've done this so many times I already know that the impact of the inverter being marginally lower rated than the peak output of the panels will result in losses of approximately 0.1-0.2% per year from the inverter capping the peak output, but the improved efficiency from running the inverter closer to it's peak efficiency point through the year should result in something like a 0.4-0.6% improvement in output, so the net effect is a marginally improved output.

3200kWh per year seems reasonable to me for a south facing system of this size, so I'd be reasonably confident that you should achieve this or thereabouts.

tommac1 · May 29, 2012

That number of panels in one string would produce an over voltage for the 3000HF. You would have to wire for two strings to keep the voltage within the operational range. This can be done by wiring the two strings directly back to the two string inputs on the inverter (still only one MPPT though). Alternatively the two strings could be wired together with connecting sockets on the roof and a single connection will then go to the inverter. I believe that in either case that the two strings should be the same size, orientation shading etc.

SolarCity · May 29, 2012

tommac1 said:
That number of panels in one string would produce an over voltage for the 3000HF

Not by my calculations.....

Gavin A · May 29, 2012

SolarCity said:
Not by my calculations.....

or mine.

IMO it's actually pretty much perfect for getting the absolute peak efficiency from the inverter.

moggy1968 · May 29, 2012

I think it takes underspeccing the inverter a bit far. I would have used a 3.6 inverter on this one

SolarCity · May 29, 2012

moggy1968 said:
I think it takes underspeccing the inverter a bit far. I would have used a 3.6 inverter on this one

It's on the limit as far as I'm concerned. I generally go for 120% and no more. This is just personal choice though and until we get any solid empirical data from UK conditions then none of us are going to know for sure.

dsa1000 · May 29, 2012

We recently installed 14x 245watt mono modules =3.4kw system using a SMA 3000HF, this was used by sma sunnyboy design am as best efficiancy and also for system, we installed it on one string with no shading and also a SSw roof at 39deg.

dansk · May 29, 2012

Im wondering if the OP is mixing up the "two rows" of panels as "two strings" because PV-SOL wont allow me to input two strings - also no over-voltage here even with VOC @-10 and 1000w/m² irradiance.

MickF · May 29, 2012

whinmoor said:
Ok. Here's Philip's photo. Any comments? Looks pretty neat except for a possibly peeling label?
Looks like a single string as well.

I thought that the DC and AC cables had to have physical seperation, looks like even if for a small distance they are in the same conduit.

Where's the emergency shutdown procedures?

Where's the Isolation stickers?

Where's the schematic?

Looks can be deceiving..

moggy1968 · May 29, 2012

the emergency shutdown procedure has to be displayed at the point of interconnection, I.E the main fuse. I used to put it at the inverter as this seemed the obvious place, but got pinged for it on my previous inspection as the point of interconnection means between the suppliers side and the customers side, not the interconnection between AC and DC. HAving said that, could that flappy piece of paper be the shutdown procedure?

I think there are isolation stickers on there but it's hard to tell whats on them. The inverter should also have some stickers on it.

AC and DC should have physical seperation and I can't see how that would be achieved in this instance using the same piece of trunking, unless the cables go off in opposite (and rather unexpected!) directions.

It's not possible to tell if there are 2 strings from this, as there might be a connector bringing the 2 strings together further up the system. The best guide is probably the voltage readings because they will be about half what you would expect if it was one string.

Suuny Boy inverter SB3000 HF-30

SolarCity

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PhilipK

whinmoor

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PhilipK

whinmoor

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Gavin A

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tommac1

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SolarCity

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Gavin A

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moggy1968

SolarCity

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dsa1000

dansk

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MickF

moggy1968

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