Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

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].

4
votes
1answer
30 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
votes
0answers
44 views

Solar energy MPPT device with precise 12v out

Is there an MPPT device which outputs exactly 12v DC? Most of my searches led me to 12v chargers, which output a (10% to %20 initially) higher voltage that is optimal for charging the battery type it'...
1
vote
0answers
50 views

How to setup the below solar configurations?

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 ...
4
votes
1answer
45 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 ...
3
votes
1answer
118 views

Are crypto currencies sustainable?

Except generating a different kind of "money value", what is the sustainable value of crypto currencies compared to the energy consumed to generate them? Compared to currencies working with ...
3
votes
2answers
71 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 ...
6
votes
1answer
70 views

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 ...
3
votes
1answer
31 views

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 ...
4
votes
1answer
65 views

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 ...
1
vote
2answers
64 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 consume "oversupply" locally produced photovoltaics energy with non-critical consumers, such as water heaters. How can I ...
1
vote
1answer
21 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 ...
4
votes
2answers
120 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 ...
2
votes
1answer
66 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 ...
4
votes
3answers
60 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 ...
4
votes
1answer
46 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 ...
0
votes
1answer
60 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 ...
6
votes
1answer
101 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 ...
4
votes
4answers
284 views

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 ...
3
votes
4answers
109 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 ...
5
votes
1answer
103 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 ...
7
votes
3answers
367 views

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. ...
3
votes
1answer
76 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 ...
3
votes
1answer
101 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 ...
3
votes
2answers
410 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 ...
4
votes
1answer
116 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 ...
6
votes
0answers
67 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 ...
10
votes
1answer
96 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 ...
5
votes
2answers
438 views

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 ...
3
votes
2answers
99 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 ...
4
votes
1answer
69 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 ...
6
votes
1answer
181 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 ...
5
votes
1answer
131 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 ...
8
votes
2answers
70 views

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 ...
2
votes
1answer
202 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 ...
4
votes
3answers
362 views

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 ...
0
votes
2answers
198 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. ...
5
votes
2answers
88 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, ...
2
votes
0answers
44 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 ...
4
votes
2answers
109 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 ...
-5
votes
1answer
118 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 ...
5
votes
1answer
505 views

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

How much silicon is there, in kg, in a 1kw panel? Thanks!
9
votes
3answers
127 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 ...
8
votes
1answer
210 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
87 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 ...
4
votes
3answers
255 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
5
votes
2answers
474 views

Converting from W/m² to kWh/m²/day

I have access to live solar irradiance data (in W/m²) at each minute of the day in my location, they come in 3 types: minimum, maximum and average. How do I make use of these datas to convert to kWh/m²...
6
votes
1answer
80 views

Determine the solar installation size based on W/m² solar irradiance data

I have access to live solar irradiance data (in W/m²) at each minute of the day in my location. How do I make use of these datas to determine the solar installation size (in kW)? I guess what I don't ...
5
votes
2answers
138 views

Trying to figure out what to buy for my solar power system

My plan is to get 4x 250w panels @24v, 6x 12v 200 ah batteries, a 60 amp charge controller and 1000w pure sine inverter. It will be a 48v system. How does all of this scale with each other? Also I ...
2
votes
1answer
83 views

Detailed breakdown of Solar PV installation site test (site survey)

I'm slowly teaching myself on how I can build a solar PV system for my own home. Anyone kind enough to provide a breakdown of what tools i need to test my site for an optimum conversion of solar ...
6
votes
2answers
92 views

How large a solar panel would I need to electrolyse 1 liter of water?

I am interested to know how large a solar panel one would need to produce pure oxygen and pure hydrogen from sea water. I already found the required energy here: If you assume perfect efficiency......