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Questions tagged [solar-power]

Questions on obtaining electrical energy from the light of the Sun through either direct photovoltaic conversion or thermal conversion.

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28V vs. 124V on the ISS

Apparently the US segment of the ISS runs on 124v DC, while the Russian segment is on 28v DC. Why the difference? I understand it is often safer to have several different voltages rather than one, but ...
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0answers
36 views

Solar preheated magnetoplasmadynamic thruster

Can focused sunlight super heat the gas in a MPD taking less electricity to change the fuel into plasma? From comments: http://www.projectrho.com/public_html/rocket/enginelist.php#id--Beamed_Power--...
11
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2answers
2k views

Why latest Landsat satellites have solar panel on only one side?

It is normal for satellites to have solar panels on both sides of the body. But Landsat satellites, from Landsat 4, seems to have the solar panel on only one side. Are there any specific advantages ...
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1answer
74 views

Why did Deep Space 1 use solar concentrators?

@Hobbes' answer mentions that Deep Space 1 used special refractive solar concentrators attached to photovoltaic cells. According to SCARLET: The innovative array uses 720 lenses to focus sunlight ...
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0answers
13 views

Has direct bandgap photoemission from III-V solar panels on spacecraft ever been detected or reported?

I thought I had asked this question before, but I can't find it now so I will ask here. I have asked a related question in Physics SE: Do III-V based photovoltaics “glow” (photo-luminesce) when ...
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1answer
104 views

Why satellite’s solar panel wattage is often listed in specifications?

What is the purpose of listing the power output (Wattage) from solar panel, without the energy/power specification of batteries or other electrical storage devices? Do satellites often use the power ...
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0answers
27 views

What is InSight's one-sol energy budget like on a good day?

I am worried about InSight's solar panels getting covered in dust: Why do InSight's solar panels have tall vertical ridges between segments - will these trap dust? Help me to sleep better. What would ...
18
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1answer
2k views

Brushing clean a Mars lander's solar panels

A comment by SF. regarding the InSight Mars lander caught my attention: I really, really wonder why they didn't just include a small compartment with a duster brush grippable by the robotic arm. ...
8
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1answer
312 views

Could dusters be installed on solar panels on a mars lander? [duplicate]

I see on the interwebs that the lander Insight is about to land on Mars and the NASA PR describes the solar panels as producing 600-700W now and 200-300W when covered in dust. Is there any reason why ...
3
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0answers
47 views

What are the tradeoffs of circularly unfurling solar panel over linearly deploying solar panels?

Martian landers like Phoenix and Insight uses circularly unfurling solar panels. The regular satellites make use of linearly unfurling panels. What are the primary reasons why linear unfurling ...
5
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2answers
105 views

Does a solar geometry library exist for satellites in LEO?

I'm looking for a solar geometry library built for a cubesat in LEO. In my research so far, I've discovered the MINES Paris-Tech Solar Geometry 2 library (http://www.oie.mines-paristech.fr/...
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1answer
142 views

Could the International Space Station be fitted with solar sails?

How much solar sail and vane surface area would be needed to replace the boosts needed to keep the ISS in orbit? Could this be done at a higher orbit minimizing atmospheric drag? What is the closest ...
10
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1answer
204 views

Why the MASCOT lander has no solar panels?

The MASCOT lander carried on Hayabusa2 just landed on Ryugu, completed it's mission and finshed operation as it has a non-rechargeable battery and no means to generate power. See this answer for more ...
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3answers
449 views

Can a satellite utilize gravity gradient stabilization, solar power, electrodynamic tethering and dynamic quadrupole momentum at once?

Have any analysis been done using 2 or more devises above to function as a satellite where 1 alone would not to maintain orbit without propellants? Will this system or one with a different ...
2
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0answers
54 views

Would a lower LEO ISS orbit really have a shorter eclipse duration than a higher one?

This comment says Lower orbit also mean shorter ones; for observations (one of the ISS missions) it is an advantage. It also have shorter night times (ie smaller batteries).. and the likely ...
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0answers
76 views

What technology assistance did NASA give to hikers to the South Pole using renewables-only?

The CBS News article Expedition Antarctica: A father and son's journey to save the planet says (in part): The success of the expedition necessitated the pioneering of new equipment that would use ...
5
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2answers
774 views

What is a typical satellite solar panel mass?

Does anyone know a reliable source to find the mass of solar panels on satellites (in particular GEO satellites)? I know they will vary but I am struggling to even find one data point let alone a ...
4
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1answer
112 views

Hows does “Glenn Research Center's sapphire refractive secondary concentrator” work?

Clicking through NASA.spinoff.gov I came to the page for spinnoff 2001 Glenn Research Center and found this: Glenn Research Center's sapphire refractive secondary concentrator will be used with ...
3
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1answer
90 views

What effects does atmosphere have on solar panels?

For the purpose of this question I do not want to focus simply on the fact that there will be less "night time" for the panels while in orbit/outside the atmosphere of a planet. What I'd like to ...
2
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1answer
165 views

Why not a landing platform with solar cells on the Mars 2020 rover for the helicopter scout?

In May 2018 the Mars Helicopter Scout (MHS) was approved to fly on the Mars 2020 mission. Author: NASA/JPL-Caltec. It's a solar powered helicopter drone with a mass of 1.8 kg and a coaxial rotor ...
3
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0answers
62 views

Have inflatable solar arrays ever been used in practice?

Was trying to find some "experimental" solar panel designs, and came across a rather fascinating design idea, inflatable solar panels. I feel like something this compact would work stupendously for a ...
4
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4answers
372 views

Can a solar sail be added to an ion engine and work better?

Has there been a concept vehicle that uses both solar sails and ion engines? Does the added mass of each system increase or reduce the spacecrafts total delta V capabilities? Inspired by S.F. As S.F....
4
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1answer
129 views

Why are the Global Precipitation Measurement (GPM) satellite's solar panels angled so strangely?

The Global Precipitation Measurement Mission (or GPM) spacecraft (1, 2) has two solar array panels. They extend from opposite sides and one is tilted with respect to the other. This is a slightly ...
3
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1answer
78 views

Feasible to use lasers / concentrated light to power solar cells in our solar system?

I was watching a video on Youtube which criticized Elon Musk's idea to use solar power to power the space craft at long distances from the sun such as Saturn. That got me thinking whether it would be ...
2
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1answer
203 views

Can orbital maneuvers be performed by a solar sail to correct eccentricity?

This unique model would spend very little time in Earth's shadow and eccentricity correction is performed on every pass. Can the angle of the hard flat solar sail or one big solar vane maintain an ...
11
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6answers
2k views

Can a satellite work like a radiometer?

Like a Crookes Radiometer, could a satellite have a stiff vain to maneuver? With a white side to let light pass and the black side capture light radiation be enough provide radiation pressure to keep ...
4
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2answers
432 views

Solar Flux on Mars Surface

Considering that the Solar Flux on top of Mars' atmosphere is 590 W/m2 (following the 1/r^2 relation for sunlight), how much of this incident light actually arrives to Mars. In other words, what is ...
5
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0answers
147 views

Low energy cements for Mars and Callisto. Waterless cement for the Moon. Any good candidates?

In the non-polar regions of the Moon and Mercury there is a shortage of volatiles, including hydrogen and nitrogen, so they might be regaded as too valuable to be "wasted" to prepare concrete. ...
6
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2answers
319 views

What does Specific power [W/kg] of a Solar Array exactly mean?

I am trying to size (weight and surface) a Solar Array for a Mars Base (university project) and the main specification I get is Specific Power [W/kg]. However, I need to relate both weight and surface,...
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1answer
129 views

Dyson Swarm: Does Mercury have enough mass/raw material?

Does Mercury have enough mass/raw elements to construct an Inverse Dyson Swarm/Bubble (for lack of a better term)? Inverse Dyson Swarm/Bubble Wiki -- a lot like the Dyson Bubble around the star, but ...
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0answers
135 views

How to size Solar Array for Mars Surface

Good morning everyone, I am working on a project for my university where we need to perform a PrePhase A study for a Mars Infrastructure for Propellant production as a means of support for future ...
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1answer
164 views

Radioisotope thermoelectric generator vs Solar? [duplicate]

What circumstance would a radioisotope thermoelectric generator is better to use than solar cells in space probes and rovers?
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1answer
76 views

How large would be the seasonal variation of eclipse duration for a spacecraft in LEO?

The question How long will a 500 km altitude satellite spend in Earth - shade per orbit has several answers, and there is some discussion of constraints related to maximum eclipse, due to some issues ...
3
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2answers
256 views

How fast is the onset of periodic eclipse for a spacecraft in LEO?

A spacecraft in low inclination LEO will undergo regular eclipsing of the Sun and this is a big issue for power management. How fast is the light-to-dark transition, say 90% to 10% sunlight intensity ...
6
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2answers
655 views

The Orbital Mass Accelerator Engine Theory

Can 2 satellites equal in weight traveling on the same orbital path in the opposite directions intersect and propel each other to gain altitude in orbit? Can orbital perturbation be negated during ...
1
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1answer
682 views

Why would SpaceX limit Starman’s Tesla signal transmission to 12 hours and not use solar power? [duplicate]

I'm as smitten as everyone else by Elon’s Starman cruisin' his Tesla through the cosmos. But I'm even more curious why we were limited to a signal transmission architecture with a mere 12-hour life ...
17
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1answer
1k views

What inspired the circular panels on the Phoenix Lander and InSight rover?

The solar panels on the Phoenix Lander and InSight rover seem to take on an iconic new look of circular solar panels. As far as I could see solar panels on landers and rover took up the maximum ...
2
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1answer
747 views

How much do solar cells for space cost? [closed]

There is a lot of discussion about refueling rockets in deep space. This is to be managed by electrolysis of water powered by solar cells. This requires a lot of energy so one needs a lot of solar ...
16
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1answer
1k views

Can ISS fold its solar panels?

The solar panel modules of ISS use an extending central truss structure to stretch two "ribbons" of solar panels. Can that structure be re-folded in space, if need arose (for whatever reason), or is ...
7
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1answer
241 views

How are the orientations of the ISS' eight independent solar arrays optimized?

I've noticed that in various photos and videos the orientation of the ISS' eight independent solar arrays are often moving, and usually some are different than others. 0th-order naive thinking would ...
9
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1answer
895 views

What are the sources of light at L2? How will the James Webb telescope be powered?

The James Webb space telescope will be positioned very close to L2. According to JPL, Webb will have a large solar-array to power itself. I don't understand how this works, since L2 is positioned "...
1
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1answer
75 views

Will the Planetary Society's LightSail spacecraft's solar panels be articulated during each orbit?

The NYTimes article Review: ‘Bill Nye: Science Guy,’ a Portrait of a Fighter for Facts includes a link to the film's trailer on YouTube and a photo of Bill Nye with a model of a 3U cubesat attached to ...
9
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1answer
239 views

Do Orion's solar panels have adjustable sweep?

In this video overview of NASA's proposed EM-1 mission, the solar panels on the Orion spacecraft are initially shown extending perpendicular to the spacecraft (at around 3:46). Shortly after that, as ...
4
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1answer
354 views

How are the silicon PV cells constructed in the ISS's solar panels? Are they as flexible as they appear here?

My understanding is that the ISS's solar panels are silicon and double sided to maximize bang-for-the-pound (average power per kilogram transported to orbit). See Are the ISS US Segment solar arrays ...
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1answer
59 views

'Space Transit Habitat' source(s) of energy

What are the sources of energy for a Space Transit Habitat(manned) in terms of both propulsion( after passing over the Low Earth Orbit) and required electric facilities)through a 6-8 month voyage to ...
1
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1answer
270 views

Why do the solar panels on the seven Sentinel configurations look so completely different from each other?

I understant that these six different Earth-observing satellite platforms measure and image Earth data differenty, but there is just such a wide variety of different ways to build solar panels and ...
3
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1answer
411 views

ViaSat's 18 kW solar array - largest ever for a commercial telecom satellite?

Now that the protests at Kourou Space Center in French Guiana are over, Arianne has launched both EutelSat 172B and ViaSat-2 as 2017-029A. While EutelSat 172B has a ...
8
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2answers
666 views

How does ROSA unroll? (Roll Out Solar Array)

The upcoming SpaceX launch with the apparently first re-use of a dragon capsule will bring with it the Roll Out Solar Array (ROSA). (See also: More science, reused Dragon capsule featured on CRS-11) ...
6
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1answer
368 views

Are the ISS US Segment solar arrays double-sided?

Some answers on this site claim that the ISS US Segment solar arrays are double-sided (i.e. cells on both sides of the blanket). I tend to doubt this, but a search of my references did not turn up ...
9
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1answer
2k views

How much light is there on the way from Earth to Proxima Centauri?

I want to know how much light is there for a spacecraft that flies from earth to Proxima Centauri. I know there's the sun but what happens after the spacecraft leaves the solar system? Are there stars ...