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Solar Photovoltaic (PV)
Last Post by Transparent 6 months ago
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Transparent
 Transparent
(@transparent)
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Posts: 2381
16/11/2024 3:06 pm  

@burtis  we don't know how many PV panels can be fitted on your roof.
You might be able to estimate it if you know the size of your tile/slates.

The majority of panels are about the same size: 1.0 x 1.6m

And the output is also becoming very similar across manufacturers:

Voltage will be in the mid-thirties (32-38v ish)
and current will be between 11-14 Amps.

The majority of inverters have a similar voltage range which is 'acceptable' for a string of panels to be connected:

Anywhere from around 150v to 450v will usually allow the MPPT peak-power tracking system to work

So if your roof can support a significant number of panels (as mine can), then you need them divided into separate strings which present a sensible output voltage towards the top end of the range.

Save energy... recycle electrons!


   
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Burtis
 Burtis
(@burtis)
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Posts: 108
Topic starter 16/11/2024 3:34 pm  

@transparent 

LookIng at my local area all houses are the same basically. Old council lots. 

Most have 14 panels on the roofs they are quiet old though so maybe newer ones are larger (some have 10 probably because of shading from a neighbour by the looks to the hill and steps)

I have no idea about any of this just thought ahhh seems like good value and I don't plan on moving so get it on the roof earlier rather than later 😅

Should probably keep the money aside to sort the heat pump out though if that all goes tits up

This post was modified 6 months ago 2 times by Burtis

   
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Transparent
 Transparent
(@transparent)
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Posts: 2381
17/11/2024 12:15 pm  

What will have changed over the years will be the power output of those PV panels.

5 years ago a 'standard' 1.0 x 1.6m panel would be producing around 250-280w peak.

2 years ago that would be 360w

Now you can get 460w

So you can achieve a lot more electricity from the same-sized roof area.

 

Another thing which installers sometimes forget is that the panels don't mind if they're arranged vertically or horizontally on the roof.
If you look around, you can find houses with roof space wasted because more panels could've been fitted if they'd been placed horizontally.
Sometimes the panels manufacturers stipulate that the fixing-clamps must be on the long-edge...
... but there are vertical-oriented roof-rails which can be fitted if that's the case.

The cost of the installation work itself is now such a major part of the overall price that there are unlikely to be better deals if you wait until later.
Even if you negotiated a further 10% off the price of the panels themselves, it would make negligible difference to the final bill.

Save energy... recycle electrons!


   
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