Solar maximum

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Solar maximum

Postby Fagio » Tue Jan 17, 2017 3:24 pm

I am in the process of upgrading my solar 2.4KW (Sunpower 300 Panels/ SMA Sunnyboy 3800 inverter) with 5 kw system (20 Trina 290 watt panels and Zever 5000 inverter. My electricity supply is single phase. The 2.4 Kw panels sit on the eastern side of the building. The new system will sit mostly on the western side 14 panels and 6 panels on the northern. I understand that NSW limits export to 5KW for single phase. My question is could I have both systems connected to achieved a full day of solar as I would not expect the 5KW would be exceeded. Still learning.
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Re: Solar maximum

Postby Gordon-Loomberah » Tue Jan 17, 2017 3:56 pm

Welcome to the Energy Matters Forums Fagio :)

You will probably need to use an inverter that limits exports, although if the E and W facing panels are tilted enough from horizontal you wont have to limit things too much. Alternatively, you could run loads to ensure you don't exceed the limit.
However, your provider may not allow what you are proposing, without you installing a device to limit exports to 5kW.
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Re: Solar maximum

Postby Fagio » Tue Jan 17, 2017 4:14 pm

Thanks Gordon. You are right on the mark, my solar company have just advised my as much. Regards Fagio
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Re: Solar maximum

Postby Gordon-Loomberah » Tue Jan 17, 2017 4:22 pm

Have you considered a battery to absorb any extra energy? You'd still need to have export limiting, but you can save the energy for your own use at night.
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Re: Solar maximum

Postby Fagio » Tue Jan 17, 2017 7:57 pm

Yes That is an option i have to investigate.
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Re: Solar maximum

Postby davidg » Tue Jan 17, 2017 10:55 pm

Fagio wrote:Zever 5000 inverter.

If this the inverter being used (pretty cheap and not patch on a proper SMA inverter) make absolutely sure it is installed in a place where it will ALWAYS be in permanent shade and cooler the better, ie the south side of the building or inside the garage for instance.

Did you consider installing the panels and hooking up to your existing Inverter, the SMA typically can be massively over driven, the array would have to matched to the inverter, but it can be done. #just saying
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Re: Solar maximum

Postby Icarus » Wed Jan 25, 2017 11:00 pm

davidg wrote:the SMA typically can be massively over driven, the array would have to matched to the inverter, but it can be done. #just saying


Davidg I have 5kw facing west and a SMA 5kw inverter , I want to put 2-3 Kw on the east roof but angled 40 degrees north, to catch winter sun . roof pitch is 18 degrees not to steep . could the inverter handle this ? also want to add say 12kwh of batteries .
reason being to power AC for heating on winter mornings .
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Re: Solar maximum

Postby davidg » Wed Jan 25, 2017 11:22 pm

Icarus wrote:I have 5kw facing west and a SMA 5kw inverter, I want to put 2-3 Kw on the east roof but angled 40 degrees north, to catch winter sun . roof pitch is 18 degrees not to steep . could the inverter handle this ? also want to add say 12kwh of batteries.


Which Sunnyboy inverter model do you have? I need to look up the specs. The existing array/s is it/they using 2 x MPPT's or ??? Then are all the panels facing in the same direction and at the same angle?

12kWh's of batteries I'm guessing that would be usable energy and using a Sunny Island 6.0H (4.6kW's continuous) ? What type of batteries are your preferred option?
Off-grid Systems specialist- You could store Sun to use later- I Do!
SELECTRONIC SPMC-482 7.5kW, 8.2kW's of Arrays

with AC-Coupled Grid-Connect Inverters,
1100Ah 48V Bank

Auto Backup Genset
PVOutput Stats

Sparkys light up your life :)
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Re: Solar maximum

Postby Icarus » Thu Jan 26, 2017 7:56 pm

Its a 5000TL here is a pic ,
Batteries ? I was thinking Lithium of some sort .
The black on the east side is pool heating but that could go some of it .
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here is my roof
20151129_131207.jpg (84.91 KiB) Viewed 527 times
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