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].

Filter by
Sorted by
Tagged with
1
vote
0answers
14 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. ...
0
votes
0answers
27 views

How many 12V batteries for a 4000 Watt Inverter [closed]

How many 12V 100 Ah Deep Cycle batteries would I need to power a 4,000 Watt Inverter?
0
votes
0answers
25 views

Solar setup for well pump

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. ...
2
votes
1answer
25 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 ...
1
vote
0answers
23 views

Must I install bypass diodes across my solar panels?

I have an array consisting of ten solar panels wired in series as shown in the figure below: My problem is that during some winter months (Oct - Dec maybe), in the afternoon, the sun is so low that ...
1
vote
1answer
55 views

Are solar powered cars sustainable and are they a good idea for future transportation?

As population rises, fossil fuels will start depleting so are solar powered cars a good idea? How much power can they produce when it is cloudy?
2
votes
1answer
44 views

How to work around a supposed Huawei SUN2000L-5KTL inverter throttling issue

I have a PV system with a WEG SIW300H M050 inverter, which is simply a rebadged Huawei SUN2000L-5KTL (link to the manual). Its rated output power is 5000 W while its nominal apparent power is 5500 VA. ...
2
votes
3answers
191 views

Pros and cons of solar panels over a parking lot?

What are the net benefits to clearing a plot of trees, or grass to install solar panels? Isn’t it better to install the panels over parking lots?
2
votes
1answer
37 views

Do light fixtures with small solar panels require direct sunlight?

I purchased an Osram Ledvance DoorLED Solar product which charges its own batteries and turns on automatically at nighttime to provide light. It requires a 7 hour minimum charge time. When there is ...
1
vote
0answers
22 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 ...
2
votes
3answers
92 views

PV system: Which to upgrade first: panels, inverter, batteries?

General question Adding on from the title, what are the restrictions to ensure that the various components of the PV system are compatible with each other? Are there rules around how many batteries, ...
2
votes
2answers
115 views

If water gets on solar panel connector from cleaning or rain will it cause problems?

I have a solar array with 8 panels. There is a slight gap between each panel. At 2 locations string MC4 connectors are placed between the gaps. My question is if water gets on this connector (and not ...
1
vote
1answer
201 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 ...
3
votes
1answer
54 views

With current technology, how much CO2 is emitted when making renewable power plants?

In order to make a solar panel or a wind turbine, a few basic inputs are required: labor energy water raw materials Given the current abundance of renewable resources, I assume that the first three ...
3
votes
1answer
59 views

With two 50W panels best to wire in series or parallel?

Charge controller (Renogy Wanderer 10A PWM) can handle the combined voltage when wired in series. From the spec sheet, it has a max PV input voltage of 50VDC. Panels connect to a charge controller ...
3
votes
1answer
60 views

Is there a difference between DC \ PV cable and AC cable?

I have now seen a few DIY tutorial videos (not in english) which suggest that one should use DC cable for connecting Solar Panels to the Inverter. They claim that AC cable causes a greater voltage ...
0
votes
1answer
52 views

Charge controller reading voltage but no amps

So I have a small solar setup (100w/200ah) in my camper van. I left the controller/panel/batteries hooked up thinking I would occasionally clear the snow and there would let the sun topped the ...
1
vote
0answers
37 views

Adding solar to a small van.. just need steady 12v source not a battery bank.. question about switches and isolators? [closed]

I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator. Sitting on top of the battery I have a 1200 Watt pure sine 100v inverter connected ...
3
votes
1answer
68 views

How can I calculate from peak power (kWp) to energy per day (Wh/day)?

According to this Wikipedia article (Dutch) there is a rule of thumb that the energy output of a solar system is 850 to 1000 kWh per year per Wp. However, this takes the grey climate of the ...
3
votes
1answer
173 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 ...
3
votes
1answer
1k views

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 ...
5
votes
1answer
184 views

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)...
0
votes
1answer
70 views

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 ...
3
votes
1answer
87 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 ...
3
votes
1answer
66 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.
5
votes
1answer
70 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
vote
0answers
61 views

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 ...
4
votes
1answer
56 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 ...
5
votes
3answers
196 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
118 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 ...
4
votes
2answers
45 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
231 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 ...
6
votes
3answers
184 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
vote
1answer
91 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 ...
7
votes
2answers
4k 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
71 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 ...
5
votes
3answers
65 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
votes
1answer
59 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
84 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 ...
8
votes
1answer
109 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
714 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 ...
2
votes
4answers
118 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 ...
6
votes
1answer
151 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
1k 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. ...
2
votes
1answer
134 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 ...
2
votes
1answer
129 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 ...
4
votes
3answers
657 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
122 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
1answer
225 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 ...
9
votes
1answer
110 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 ...