Questions tagged [solar-power]

Electric energy produced from sunlight. This could be via semiconductors, in [photovoltaics]; or through the concentration of solar heat to drive a turbine, as in concentrating solar power [solar-thermal].

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32
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3answers
3k 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
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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 ...
23
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1answer
508 views

Do small portable solar chargers generate more energy than it costs to produce them?

I know large solar panels generate more energy than is needed to manufacture them, but what about small portable solar chargers for mobile phone or radio? I've read somewhere that their efficiency is ...
41
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6answers
928 views

Producing my own energy options in urban area with windows but no roof access?

I'm wanting to produce my own energy, but I live in a condo with no access to the roof. I'd like to produce electricity, so maybe turning that energy into electricity safely. I have windows that have ...
-5
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4answers
42k views

Solar energy without the sun: Super LED light on top of solar panels? [closed]

Some questions: Can LED light provide same amount of energy as sunlight? Can humanity get rid of the sun and charge solar panels from LED light alone? If this is feasible, this would be truly ...
9
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3answers
405 views

Are there types of solar panels that can be made completely locally and independent of fossil fuels?

I want to know if there are any kinds of solar panels that can be produced completely locally, from gathering materials to manufacturing to installing, without fossil fuel inputs anywhere in the ...
7
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2answers
5k views

How to set up grid-tied photovoltaics without feed-in?

In my current place (Morocco), the electrical utility operator does not allow feed-in. How can I create a photovoltaics installation that respects this rule? I would like to create a grid-tied ...
8
votes
3answers
492 views

Offsetting with Solar, over what period do you measure the carbon offset

I'm looking to offset the carbon footprint of my wedding. I'd like to do it by helping out some local community solar projects. I've calculated that the wedding's footprint will be about 23,000 kg ...
6
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3answers
219 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 ...
1
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1answer
128 views

What do the different rules for photovoltaics feed-in mean?

When researching about photovoltaics feed-in to grid options in my area, I came across various terms: net metering, feed-in limit, zero export / zero feed-in, solar smoothing. Can somebody explain ...
11
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2answers
16k views

What's needed to set up a personal solar power system?

I'd like to set up a solar power system to power a small house, say 20 kWh per day, 600 kWh per month. What equipment do I need to make it happen? Production and storage are both important. I'm ...
13
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2answers
1k views

How do white roofs cause global warming?

Another user asked the question, and I think the question is important enough to deserve it's own post. I've heard that white roofs drive away clouds and cause global warming. How can this be?
8
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2answers
127 views

How to improve energy efficiency of composting toilet?

I've been looking at a commercial composting toilet for a mobile, off-grid application ("boondocking rv"). I've done a power budget and the toilet is coming out as the biggest user of energy. Power is ...
7
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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 ...
10
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3answers
165 views

How can I cheaply evaluate how much solar energy I can collect?

I'm nearing the end of the life of my asphalt shingles on my house (the inspector estimated 2yrs left when I bought the house 2yrs ago). Since my house is 100% electric and my state (Nebraska) offers ...
16
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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 ...
15
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8answers
2k views

What alternatives to batteries exist to store solar energy at home?

What viable options (other than batteries) exist for a home owner to be able to store energy from solar panels for use at night or when the sun isn't shining? I realise there will be losses in the ...
9
votes
1answer
256 views

Establishing a Small Commercial Solar Plant

This question may be outside of the scope for this forum, but I'm having a hard time finding good information, and thought asking here might be worthwhile. I started looking into farm-scale solar ...
6
votes
1answer
578 views

Solar UPS with Priority of Power Sources

I would like to add solar to my energy mix. For context, my grid supply is unstable. Currently I have a UPS which switches to Batteries when grid goes down. I have been researching products which can ...
5
votes
1answer
622 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 ...
5
votes
3answers
392 views

Which battery is best for solar power?

I just bought 50W solar panel with charge controller. Can I use standard Car Battery (Liquid type)? The battery is planned to be used to power my night lights at the rooftop garden
4
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1answer
114 views

Any way for microinverter PV array to power a house when the grid is down?

Suppose I'm already heavily invested in microinverter type solar panels -- with the inverter on the panel on the roof. These comply with UL 1741 and will stop supplying power the moment they see grid ...
28
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7answers
10k views

Why am I offered a 5 kW inverter with a 6.6 kW solar installation?

I've just received two quotes for installing a rooftop solar system at my residential address (near Sydney, Australia). This caught my eye: Company 1: Panel: 22 x ET panels 300w Inverter: Growatt 5 ...
8
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1answer
184 views

Is the energy used to manufacture and install solar panels in proper balance with the energy output from them? [duplicate]

From mining/harvesting materials to altering them into useful manufacturing materials to making actual products, and then packaging them and shipping them to retail stores, or directly to customers, ...
5
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2answers
125 views

How to calculate the estimated production by solar PV panels?

I know what is the irradiance in my region, therefore I know what is the maximum expected production when the solar panels are placed optimally (interestingly, the two links provide different optimal ...
1
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1answer
235 views

Does a PV panel take more energy to build than it generates in its lifetime? [duplicate]

Industrial energy costs are $1 per million BTU (MMBTU) or 300kWh, or $3*10^-6 per watt hour (Wh). http://www.eia.gov/consumption/manufacturing/ Solar has 1 kg of 9n silicon per 100W, at $20/kg. ...