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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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Can humans reverse the solar eclipse from the executive crisis with the stars or different galaxies and is space infinite [closed]

I’m asking a simple question I just need awsers and all the solar eclipses were caused by the moons so what if we just reversed it with all the technology that we have.
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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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1answer
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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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Solar cell phone charger a sustainable choice?

So I bought this handy and 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 cost(carbon dioxide and resources)...
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Are there currently any solar panels that are produced/built entirely with solar power/energy?

The closely related Are there types of solar panels that can be made completely locally and independent of fossil fuels? Suggests that it is possible to make solar cells without fossil fuels. I ...
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77 views

Which measure of solar irradiance is needed to calculate the energy output of PV systems?

According to "E = A * r * H * PR" global formula to estimate energy generated, the solar irradiance value is needed. I have Horizontal irradiance, Tilted irradiance, and Normal irradiance values but ...
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1answer
52 views

Solar charging an e-bike's lithium battery while riding

I would like to know what parts I would need to charge a 36V lithium battery for an ebike? I want to charge the battery while riding the bike for greater range.
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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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How to setup the below solar configurations? [closed]

I have following components :- – 2 * 250 watt solar panels v-guard – 1 * 12 volt, 150ah battery mtekpower – 1 * 900va inverter v-guard – 1 * 12/24 volt , 50amp charge controller v-guard the ...
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1answer
47 views

How can I install solar panels far from the regulator?

I'm building a solar installation for a summer camp, and we were looking at the following kit (1000W, 12V) We wanted to have the regulator+inverter in a closed little stall, but that stall is usually ...
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3answers
130 views

What capacity solar system is required for new homes under the California 2019 Building Energy Efficiency Standards (Title 24)?

From the press release (emphasis added): Moving to cut energy use in new homes by more than 50 percent, the California Energy Commission [CEC] today adopted building standards that require solar ...
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Are there advantages to putting solar panels on individual homes rather than in large solar farms?

Suppose 10 million new solar panels will be installed in some country this year, and there are two options: A: the solar panels go onto the roofs of 1 million individual houses B: the solar panels ...
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Is there a simple on-line tool for estimating wind turbine power output?

The back-and-forth in the comments on this answer sent me searching for a simple tool that would enable a user to put in a location, wind turbine size, and a few other parameters, in order to estimate ...
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Can hot air move horizontally without a fan (vertical is easy)

Passive solar thermal, taking cool air at bottom and hot air out at top is easy. But can the same 'hot air rising' system be made to work horizontally. IE long black tube on a narrowboat Any ideas ...
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How to consume all my photovoltaic electricity locally?

In a location where feed-in to the grid is not rewarded, it makes sense to consume "oversupply" locally produced photovoltaics energy with non-critical consumers, such as water heaters. How can I ...
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32 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 ...
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708 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 ...
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67 views

How to size an PV array?

Due to limitations on the street fuse we are going to make a new house ( 50 m2 ) a hybrid off-grid solution that is at the rear of an existing house which is on the grid. So, this means we can charge ...
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3answers
62 views

Cost benefit analysis of a PV array with racking to set optimal angle, vs a larger array

I'm thinking of installing some panels on the roof. It's unshaded but only pitched at 5 degrees on long run roofing iron. Would I be better off racking at an angle to optimize for winter sun, or just ...
5
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1answer
50 views

Size and reliability of inverter for refrigerator in an off-grid tiny home

I am building an 'Off Grid' tiny home, with my primary energy supply from solar + battery storage. I intend to utilise low voltage everything possible with the exception of a standard home washing ...
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1answer
66 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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1answer
103 views

How to attach more sources of energy to your charge controller

Lets say I have an existing solar power system. If I want to add a wind turbine or I get more solar panels, is it as easy as just attaching the new sources of energy to my charge controller (in ...
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Solar/battery powered portable freezer or fridge?

Well, last week we got hit by cat 5 hurricane Maria. So I'm thinking, one of the things I miss the most right now is ice. Considering the amount of sunlight that we have, does a battery-powered ...
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4answers
111 views

Low-cost solar energy alternatives to power a single appliance in an apartment?

I'm searching for information on solar energy alternatives that are accessible to people like me without having to break the budget. For example, I live in an apartment with a rooftop, and I want to ...
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1answer
117 views

PV and Battery circuitry for DIY off-grid solar power

I am in need of setting up an off-grid power supply for a 10k btu air conditioner (plus some extra power for light use, like laptop charging). The AC runs at 7-8 amps 110v, but I'm unsure of it's ...
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Is solar energy the best renewable source of energy?

Here is my thinking on renewable resources. Biomass is the absolute worst way to go because it releases CO2 and damages habitats. Geothermal is not far behind but is for a different reason. ...
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82 views

Solar water-pump working continuously

I want to install a solar water-pump or a windmill water pump to extract water from an aquifer without stop during the day (constant flow). The solar water-pump is less expensive and comes with the ...
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1answer
102 views

How large should be solar panel to power air conditioner?

Solar panels are more efficient in sunny regions, but even in places that receives less sunlight, there are hot days when electricity consumption peaks because of air conditioning. More sun = warmer ...
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456 views

Why is solar energy so expensive?

I was surprised to find out recently that solar power plants tend to be more expensive than traditional energy plants based on depletable resources like coal and oil. Why is that? It seems as though ...
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1answer
117 views

Apply solar energy solutions at our apartment?

I know this will probably get closed, but it seems that I can't find anything that will guide me in the right direction. We live in a South American country, so we have tons on sun. We also have a ...
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1answer
97 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 ...
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1answer
100 views

Are there solar panels that can survive extreme temperature changes?

I want to look at getting solar panels for my home. Unfortunately, one thing that I need to resolve first is whether or not they will work / last while in the temperature extremes - anywhere from -40 ...
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2answers
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How much irradiation from the sun is required to generate solar power?

Interested to know how to calculate how much energy photovoltaic (PV) panels would produce given x amount of solar irradiation per day - amount of direct sunlight and how much that might be effected ...
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103 views

Solar Lights With Little Sunlight

My solar lights charges the rechargeable batteries. But in the winter there is not enough sunlight to keep the lights on all night. The solar cells and batteries are in parallel; can I add an AC 3 ...
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1answer
70 views

How can I find out what a reasonable rate for installed solar is?

I'm looking to have a ~20kW grid-tied solar system installed at our property in Ontario, Canada. I've been searching and reading but am unable to find current (last year or two) data on how much such ...
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1answer
188 views

Can 140 square miles of solar panels power the US?

In the book The Upcycle (copyright 2013) by William McDonough and Michael Braungart, the authors make the following claim: ... consider exactly how much desert area covered in solar collectors ...
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1answer
151 views

Battery Positive Terminal Growth

I'm living in an off-grid house with battery power storage. Batteries are one of the most expensive and problem prone aspects of off-grid power. I have a battery bank in which some of the batteries ...
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2answers
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Feeding hotwater into modern appliances

Most appliances, such as washing machines and dishwashers typically take cold water and heat it internally. This is probably the most efficient way on a grid connected house with electric water ...
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1answer
246 views

What are lead crystal batteries?

I recently read about 'Lead Crystal' batteries on the Internet and am wondering if they are suitable for a solar-powered house. Does anyone know what these are? How old is this technology? Is it ...
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Does the price of polysilicon (for solar PV panels) depend on oil prices?

The assertion that the answer to this question is "yes" was made in an answer to another question here: Which solar power technology has the highest energy return on investment (EROI aka EROEI)?. The ...
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209 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. ...
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2answers
92 views

Fusing a Solar (PV) Panel

I am installing a solar panel which requires a 7m cable run. All the diagrams I've seen on the internet suggest fusing at the charge controller end. This protects against charge controller failures, ...
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48 views

How much capacity inverters and batteries should i need to set up a 800 watts solar panel? [closed]

my requirement is just to run ten 4-watts LEDs, a 0.5 HP submursible motor and four ceiling fans through solar panels. Calculations suggested that i need 800 watts panels to work on it. But I'm ...
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2answers
117 views

Two solar regulators to one battery bank?

I wish to connect four 250w panels to a battery bank. Each panel is rated at 15A, yet my MPPT* regulator warns against exceeding 30A. Could I add a second regulator, running two panels to each, but ...
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123 views

How does the solar industry fund itself?

Based on a previous discussion, it appears panels are being sold at less than 10% of their raw material cost. What is making up the difference? Edit: The answer seems to be that... solar is viable ...
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1answer
713 views

What is the amount of silicon in a 1kw panel?

How much silicon is there, in kg, in a 1kw panel? Thanks!
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135 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 ...
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1answer
217 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 ...
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1answer
92 views

Is it cost effective to use a solar panel in an apartment if I have a low electricity bill?

I would like to be more sustainable and I am thinking of installing a solar panel on the roof of my apartment, my question is how cost effective I will be knowing that my current electricity bills are ...
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3answers
291 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