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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744 views

What is the typical embodied energy of a solar photovoltaic panel?

What is the typical embodied energy of a solar photovoltaic panel, in terms of nominal power output or panel area? The ideal answer would be in kWh/WP, but kWh/m2 would also be acceptable. I ...
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380 views

What is the fair-market value of the Solar System installed by Solar City in 2013?

I live in the Maryland suburbs of Washington DC. On December 31, 2012, I signed a lease deal with SolarCity (now Tesla) to install solar panels on the roof of my home + associated electrical ...
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4answers
173 views

What is the most sustainable choice for a domestic hot water system in temperate, coastal Australia?

We currently have an ailing 14 yr old solar hot water installation. A few plumbers have given us the same story: due to the age and general condition of the system, it makes more sense to replace it ...
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1answer
44 views

What is the most economical and convenient house battery type?

I suppose a 5kWh storage would be more than enough for a minimalist house with solar energy system. Lithium-Ion electric car batteries would do the job, but they are too expensive and I am not sure ...
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2answers
71 views

Cost-effective way to solar charge proprietary LiPo tool packs having AC chargers

I'd like to go solar with a couple of our battery-powered tools without a) charging the batteries with DC directly, as they're expensive batteries with their own fancy AC chargers, or b) spending ...
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1answer
99 views

Renewables vs Fossil Fuel Cost Comparisons, without Subsidies

They said that Solar and Wind are now cheaper than fossil fuels. One of the primary reasons is subsidies and new technologies. Does anyone know the comparison research using No Subsidies. If we ...
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1answer
49 views

Can a solar inverter still work without batteries? (off-grid)

Consider the following setup: Solar panel (0.5 m2 / 12V / 100W) Solar inverter (12 volts DC → 120 volts AC) LED TV (32" / 55 watts) no batteries / no grid-tie Assume the solar panel is ...
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1answer
73 views

Do solar PV roofs make sense for semi trucks?

Today I read the news that Tesla is about to start production of electric semi trucks (aka tractor-trailers). Given the size of the trailer and its long, flat roof, I wonder if it would be feasible to ...
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Dominion Energy (Virginia) solar standby charges

Does anyone know anything about Dominion Energy's solar standby charge (in Virginia) ? All I can find about it is generic information such as "Dominion plans to charge $4.19 per kilowatt for a solar ...
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66 views

What is the frequency of fires at solar power generation facilities?

https://pv-magazine-usa.com/2019/08/22/there-are-solar-power-fires-per-year/ This data implies (roughly) 1 in a million solar fire risk. So say I have a 1gw solar farm with 1kw panels. Does this mean ...
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1answer
88 views

What type of solar panels to use for a house of 50 m2 and 3000 kW of consumption?

I am beginning to acquire knowledge to assemble my first self-consumption solar kit and I have been investigating what kind of solar panels I should use for a house of approximately 50 m2 with a ...
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93 views

Grid tied inverters that work during power outages

Is it possible to have a grid tied solar installation operate when power is out without a battery bank? All of the grid tied inverters I have found kick offline during power outages. This is a fine ...
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1answer
53 views

When does wind make more sense than solar for a home application?

Let's say I have a fixed amount of money that I can either spend on a complete solar PV system (panels, inverter, all the hardware and wiring) or a complete wind system (turbine, inverter, all the ...
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1answer
78 views

Callibrate a battery monitor for a ~5yr old 360Ah solar panel installation

I am looking to calibrate a new battery monitor for an off-grid battery bank that's ~5 years old, since the previous battery monitor stopped working recently. I'm not sure how to go about it given the ...
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2answers
151 views

Why should I buy the brand solar panels when the cheaper ones offer a better power to price ratio?

Following this question, I'm trying to figure out what is the best option for me. Looking at brand products, for example SunPower Maxeon 3 400/410 Wp and SunPower P3 Black 325 Wp, they offer a power ...
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1answer
138 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 ...
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1answer
96 views

Is using multiple MPPT controllers with a solar panels array, to mitigate effect of shadows a myth?

So my installation is for a sail boat. There's a lot things like rigging sails etc, that can create shadows on part of the array and this is constantly moving around. Some panels in the array will ...
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137 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 ...
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1answer
63 views

Are optic fibre based daylighting solutions sufficient for solar panels?

Some daylighting solutions are available in the market that use collectors and large diameter optic fibre cables to transfer sunlight to interiors of residential or underground dwellings. Below are ...
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2answers
133 views

Excess solar power

I am wanting to hook up a solar system to my house but don't want to feed back into the grid (for a number of reasons, including legislative bureaucracy and having to change my electricity company). ...
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1answer
49 views

Renewable garden watering system - 12v battery system (solar recharged) to ensure there is 50l of water at 20ft twice a week

I have a load of water butt rainwater storage linked to my gutter downpipes for my garden water needs, but I can't stand around waiting to fill watering cans from taps on butts, so occasionally (once ...
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1answer
70 views

What do the voltage and energy readings on this MPPT charger mean?

I've got a new EPEver 3210AN, 30 A MPPT solar charge controller, and single 320 W 40 V solar panel connected about 4 feet (1 meter) away with 12 AWG wire. It's a very simple van setup. My battery is ...
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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 ...
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1answer
91 views

Can I use 2.5kW solar panels to power 2kW rated grid tie solar inverter?

Can I use 2.5kW solar panels (10x 250 watts) to power 2kW rated grid tie solar inverter? Will anything blow up? Panels: 10x 250W, 36V panels Inverter: 2kW with max input voltage: 500V any help is ...
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1answer
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How do solar panels degrade after 25 years of warranty?

This question is focused on high quality solar panels (certified Tier 1) which are more and more mainstream. The 25 years warranty is becoming standard, and producers describe degradation in 25 years ...
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1answer
70 views

Simple solar light system

I've been looking for a simple solar powered lighting system for a carport I just built. I bought these without realizing how small they are: 2 Pack Solar Lights Outdoor. Unfortunately they look ...
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1answer
47 views

What's the current price of power to gas fuel?

I've been curious about power to gas technology. I've read up on the immense energy losses as you split water to hydrogen and then using the Sabatier reaction to generate methane. Do we know given the ...
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1answer
91 views

Can data from wind and solar farms be used to improve climate modeling?

As of 2018, there were over 341,000 wind turbines around the world. In the U.S. alone, a projected one million homes will have roof-top solar PV by 2020. This does not include commercial or utility ...
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1answer
204 views

If made on-site, what is needed for a solar panel

In this answer Russel says solar panels are: a sandwich of glass + bonder + silicon PV cells + bonder + backsheet This got me wondering how much of those materials are needed to make the solar ...
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1k views

How much energy costs do portable solar panels save in a house?

Our Houston area HOA does not allow roof top solar panels and I doubt they would survive our hurricanes too. I discovered NRG Energy sells these portable solar panels under their goal zero brand. If ...
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0answers
42 views

Solar Install Flat Roof

I want to install 23 305w panels on my roof. It's a flat roof constructed with 2x8 beams spaced at 24". There is no snow load to consider and we get occasional wind and rain storms a few times per ...
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1answer
44 views

How to identify the rating of my electrical panel

Recently I got a bid from a solar company and they said I don't need to upgrade my electrical box since it is rated at 125 amps, and for that value, I can install a 7k system based on calculation here....
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1answer
43 views

Shading percentage to cause hot spots

I'm designing a solar plant over the roof or a huge building for my company. Now the roof has a lot of obstacles, Shafts, pillars, AC equipment etc. I have a couple of questions that I could really ...
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60 views

My solar inverter display volts but no amps and a few watts. What's wrong?

I have 150watts 7 solar panels of specs : max DC volts 20; max SC amps 8.02Amps. Individually checked all 7 solar panels short circuit amps and they are in 6.54 - 7.84amps range. Solar Inverter Specs ...
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0answers
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Designing an electrical off grid system for winter

I'm currently planning the conversion of a panel van into an RV including heating, water, and electrical. The part which I'm not confident about is the reliable supply of electrical power in the ...
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1answer
78 views

Any electric vehicle that can be used as a home energy storage?

I have a house with a solar array on top currently tied to the grid. I would love to be able to use an EV as a battery for my house, and after it charges up in the day be nice to use it for the ...
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2answers
96 views

Will negative power pricing counteract the growth in solar PV capacity?

In California, the real-time electricity prices routinely go negative. Here's pricing for the four load aggregation points for California on April 1, 2020 (source): This is due to the large amount of ...
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0answers
34 views

How much renewable energy is curtailed around the world?

CAISO, the California electric grid operator, provides daily and historical reports on wind and solar curtailment: I started looking for similar data from MISO, the grid operator where I live, ...
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1answer
228 views

Is Tesla Powerwall a good investment?

I'm trying to determine if investing in a couple of Tesla Powerwall units to store solar energy is a wise financial decision. My energy cost is $0.1649/kWh. The installed price of the two Powerwall ...
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3answers
508 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 ...
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1answer
285 views

If I can create enough electricty from solar should I store and use it rather than feed back to the grid?

When we installed our solar PV system in 2010 there were several reasons it wasn't feasible at that time to store and use the power we were generating instead of feeding into the grid. The main ...
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0answers
73 views

Solar Panel Drawing Amps instead of adding them? [closed]

I have an off grid powered house powered by 6 x 12v batteries all hooked up in parallel. I also have 4 x 150w 12v solar panels all hooked up in parallel too. Things were good however I decided to move ...
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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 ...
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1answer
65 views

How do German fossil fuel subsidies compare to PV subsidies?

Over on Politics.SE there's an interesting discussion about "grid parity": "If grid parity has already been reached, why is it so expensive to switch to renewable energy?". The discussion has ...
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1answer
140 views

Can residential rooftop solar arrays be cheaply extended over time?

I am looking to install rooftop solar on my house some time this year. I have a decent amount of roof space and very little shading so I should achieve fairly ideal conditions for it. A lot of the ...
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1answer
584 views

Is it ok to mix battery brands in a solar battery bank?

I plan on installing 12V 100 Ah LiFePO4 batteries, but since they are so expensive, I might buy from different vendors. The batteries have the same chemistry, voltage, and amperage, but are from ...
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1answer
357 views

Is a solar cell phone charger a sustainable choice?

I bought this handy mobile solar charger for my cell phone. I wonder if it's a sustainable buy and looking for a report or similar that compares the production costs (including carbon dioxide ...
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105 views

Led powered solar panels? [duplicate]

I've read multiple threads about this but I've yet to come across an answer to this question.... would it be possible to have a small bank of led lights power multiple solar panels? For instance, if I ...
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0answers
34 views

Data source for real world solar PV production?

In the U.S., the National Renewable Energy Lab (NREL) provides some great resources for examining the potential of solar PV systems, such as PVWatts and the National Solar Radiation Database viewer. ...
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0answers
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Solar setup for well pump [closed]

The electricity where I live is pretty expensive at about almost 30 cents a KWh, so I'm considering setting up a solar system. I got 3 100 Watt Polycrystalline solar panels a while ago, pretty cheap. ...