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DIY solar upgrade - Considering adding more panels

 
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Solar Photovoltaic (PV)
Last Post by David999 12 months ago
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 David999
(@david999)
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Topic starter 11/08/2024 5:47 pm  

I have a growatt solar system with 10kw battery storage but only 2.6kw of panels could you help me with information on how to add other panels. There is a spare socket on the inverter and a spare plug, could I add another string and how. I would like to mount it on my garage which is box section steel with 4x9 inch joists so more than capable of holding them if I can purchase or make a frame to hold them.

IMG 3801
IMG 3797
IMG 3798
IMG 3800

 


This topic was modified 1 year ago by Mars

   
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Mars
 Mars
(@editor)
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11/08/2024 9:43 pm  

Are you going to DIY this? How big’s your inverter, kW-wise?


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 David999
(@david999)
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Topic starter 11/08/2024 10:05 pm  

@editor yes I need to nobody is interested in fitting a few panels and certainly not on the garage. Too much bother.  I posted a photo of the data tag on the inverter, not sure what figures you need but growatt told me plenty of capacity.  I think I’m only allowed to go to 4kw before I need to inform the energy supplier.



   
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Mars
 Mars
(@editor)
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11/08/2024 10:29 pm  

@david999 I’ll be super interested to see the progress.

I think @transparent might be able to offer some helpful insights.


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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 563
12/08/2024 1:18 pm  

To be frank,

If you don't know how to wire and are relying on a forum to talk you through it, you really shouldn't be doing it. DC volts will easily kill you! Isolating in the wrong order can break things. Get an electrician in. Mount the panels run suitable cables if you must, but leave the professional to do the wiring connections.

Use ballast trays to hold the panels, so no drilling required in to roof.



   
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Transparent
 Transparent
(@transparent)
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13/08/2024 11:03 am  

@david999

1: That inverter is a Growatt SPH3600TL. Its output is already limited to 3.68kW (16A) and no further consent is required from your DNO to add more panels.

2: Each of the two solar inputs is rated 120-550v DC at 13.5A max.
That's vastly more than the possible output from the inverter.
The inverter sorts this out automatically.

3: You already have 2.6kW (max) PV panels on one of the two inputs.
You could add a similar quantity to the other input and enjoy less of a tail-off from generation on overcast days.

PanelStack Sm600

 

4: Solar panels themselves are pretty cheap.
Look at these Longi panels, available from Midsummer.
The main costs are the scaffolding, labour and support structures required for roof mounting.
I can address the subject of aluminium roof rails later if you require that knowledge.

5: It's unlikely that you'd require anything of greater current-capability than the common 4mm (double insulated) solar cable.
You can buy this and the required MC4 connectors from Midsummer here, or a general electrical supplier like TLC-Direct here.
You need some tools, which I'll address separately if you decide to go the DIY route.

6: It's possible that the black/grey rotary isolator switch to the left of that inverter is already a 4-pole unit.
So a second pair of 4mm wires can be connected to it.
Personally I'd prefer to see more than just that switch.
I have fuses, over-current trips and lightning suppression on each solar array!

 

Let me stop there and hear what you think.

The comments from @johnmo about safety are well made.
I've deliberately omitted comments on safety aspects at this stage, but I have hands-on experience of how to do this work safely.

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 David999
(@david999)
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Topic starter 13/08/2024 11:03 am  

@johnmo I’m an engineer but no experience in solar. I wouldn’t install a complete system but adding another string shouldn’t be that challenging.



   
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 David999
(@david999)
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Topic starter 13/08/2024 3:58 pm  

@editor I will keep you informed but busy finishing off my house still after the flood.  The heating got sorted and the samsung bill refunded but they were at the end of their tether with me but I reminded them that I was the victim.   But altogether the room full of witchcraft became something I understand now thanks to you guys



   
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 Anonymous 5011
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Posts: 563
13/08/2024 4:48 pm  

Another source of parts is for PV is City Plumbing, seem very good price wise.



   
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 David999
(@david999)
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Topic starter 13/08/2024 4:53 pm  

@transparent

IMG 3809


   
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 David999
(@david999)
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Posts: 302
Topic starter 13/08/2024 5:00 pm  

@johnmo they seem to be fairly cheap, the ballast boxes are as much if not more.  Being engineer minded and able to weld a frame together I’m thinking much cheaper, if anybody has done this before I would appreciate images of how they went about it. I would be happy with another 4 panels.



   
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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 563
13/08/2024 5:04 pm  

Not worth the effort to make your own 4 panel system is only £315. Or you just copy to make your own angle.

https://voltaconsolar.com/products/solar-panel-mounting-flat-roof-ballast?variant=47416621564238



   
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