Questions tagged [photovoltaics]

Solar panels that convert light directly to electricity. For questions on using sunlight to to heat water use [solar-thermal]

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32
votes
3answers
2k views

Which solar power technology has the highest energy return on investment (EROI aka EROEI)?

Which solar-electric technology had the highest EROEI? Energy Returned On (Energy) Invested, also known as EROI and as EROEI, has become something of a fashionable metric *but see footnote. It is ...
29
votes
5answers
1k views

Estimating the cost of solar panels and return time?

I'm interested in installing a solar array on my property, and am trying to find tools that can help me do a cost analysis so I can optimize my budget and see how long it will take to balance the ...
6
votes
3answers
216 views

How to consume all my photovoltaic electricity locally?

In a location where feed-in to the grid is not rewarded, it makes sense to somehow consume all the "oversupply" electricity from photovoltaics by yourself. How can I implement this in an automated ...
7
votes
3answers
14k views

How can I monitor a PV system's performance?

What are things I should monitor to track a photovoltaic system's performance? I'm not looking for a recommendation for a particular piece of kit, because such a recommendation could quickly go out ...
16
votes
3answers
7k views

Would monocrystalline or polycrystalline solar panels perform best in a UK climate?

If I were to get solar panels installed on the roof of my home, in the UK, what type should I choose? There appear to be three main types, and at present the choice appears to be between the ...
9
votes
1answer
171 views

What causes photovoltaic (solar) cells to degrade?

Photovoltaic panels can have 20 or 25 year underwritten warranties with a guaranteed remaining efficiency of 80 % of the new panel. That means, that photovoltaic panels seem to degrade somehow. Why ...
5
votes
1answer
619 views

Does a building need an equator-facing roof to take advantage of Solar PV systems?

Does a building need an equator-facing roof to take advantage of Solar PV systems? That is, in the Northern hemisphere, do I need a south-facing roof? And, conversely, in the Southern hemisphere, do I ...
6
votes
2answers
150 views

Are green roofs more sustainable than roofs with photo voltaic?

Both types of roofs have advantages. Green roofs do not produce energy (in some cases just fruits) but they do not consume that much energy for production of panels, installation and control and do ...