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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7
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0answers
278 views

Were solar concentrators on HS-702 just a stop-gap measure until triple-junction PV cells were available?

According to Gunter's Space Page discussion of early versions of the Hughes HS-702 Bus: The first version of the 702 used solar arrays with concentrators. These concentrators tended to early fogging, ...
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764 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 ...
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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 ...
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1answer
614 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 ...
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663 views

When there is more power than needed, are satellite photovoltaics shunted or open circuit?

I saw the word "shunts" in this answer about DSCOVR's upgraded photovoltaic arrays when it was unmothballed and readied for space. Reading it, I get the idea that shunts are used to dissipate the ...
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Mining Helium-3 on the moon and sending it to Earth?

It would be best to mine and process material on the moon to obtain helium-3, but my question is, what if we did an unmanned mission? A small robot 1 meter long, powered by solar energy, that takes ...
6
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327 views

What are the ISS's eight “power channels”? How do they work?

c|net's NASA troubleshoots mysterious ISS power issue links to the NASA Blog post Crew Waits for Dragon Mission While Teams Troubleshoot Power Issue which says: Monday morning, teams identified an ...
6
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1answer
605 views

Could a solar thermopile be enough to power a small satellite?

It seems that a nuclear thermoelectric generator was used to power spacecrafts for some exploration missions. Can a thermopile that harvest the light/shade temperature difference on Earth's orbit be ...
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143 views

Mass ratio of solar-electric versus radioisotope thermo-electric power for propulsion; beyond how many AU do RTGs win?

Solar-electric propulsion has been used several times now in deep space missions. This question explores the scalability in comparison to Radioisotope thermoelectric generation or other nuclear-based ...
6
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1answer
147 views

Why did Salyut 7 go completely dead when its solar-array-pointing system failed?

According to Wikipedia, when Salyut 7's solar-array-pointing system failed in 1985, its batteries were rendered unable to charge, and the station almost immediately went completely dead: The first ...
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1answer
156 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 ...
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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. ...
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204 views

Why do Juno's solar panels narrow toward the core?

I'm no engineer, but if I was making a vessel with extending sails, solar panels, mast, antennae, etc. I would make them widest close to the core. But Juno's solar panels narrow toward the core as ...
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Solar panels on Mars?

I was wondering if a base on Mars could be powered by solar energy alone? Since Mars is further away from the Sun wouldn't that mean lower efficiency thus making solar not scalable? Let's assume a ...
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3answers
318 views

Fast spining solar cells to clear Martian dust possible?

I've seen a fast spinning glass wheel used in front of a camera to clear away water, dust or ice. Could Solar panels be made circular and spin to clear dust off of them in the same way may? As ...
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1answer
3k views

Could Stirling Engines work on sunlight alone?

With the heated side facing the sun and the rest in its own shade, could two contra-rotating Vacuum Stirling Engines and flywheels, in tandem, accumulate torque, to power a reaction wheel? Can the ...
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767 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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480 views

MetOp-A; Why this unusual solar panel shape and deployment method?

This solar panel is closer to square than most solar panels I've seen, which tend to be very long - length/width ratio perhaps 4 to 6. This looks like only 1.5, and it seems to be located at the end ...
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1answer
215 views

Would it be practical to use a rover with a cable to a power and communication station?

Geology Dr. Paul Spudis (who was on the Clementine Lunar orbiter mission) has an interesting step-by-step proposal for exploration of potentially extractable water ice at the Lunar poles. It includes ...
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576 views

What would keep Dyson Swarm reflectors in place?

I've been reading a bit about the concept of a Dyson Swarm and how one of the more plausible routes would be to disassemble Mercury to construct ~1km hematite mirrors as the swarm reflectors. The ...
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1answer
160 views

What criteria dictate solar panel design?

On space craft equipped with solar panels, those panels comes with various form factors and number. 2 straight rows (e.g. progress, rosetta,...) more straight rows (e.g. ATV, Juno,...) only one ...
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664 views

Why are these multi-junction solar cells 40% efficient on earth but 30% in space?

This video about Spectrolab's spacecraft power systems mentions Juno several times and it looks like the Juno panels are shown at several points in the video. Multi-junction cells are discussed, they ...
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656 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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112 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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272 views

Is utilizing the high temperature for chemical reactions on Venus a feasible way of generating electricity?

I assume utilizing habitats floating high in the Venus atmosphere as described by Geoffrey Landis. So weight, size etc is a constraint, and we will not be operating at the surface with the crushing ...
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191 views

Power supply for StarShip?

Early renderings of the Mars Colonial Transport showed 2 fan shaped solar arrays deployed while in space. I haven seen any depictions of the StarShip with a solar array either in orbit or standing on ...
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540 views

Probes on a Solar System Escape Trajectory

Not one probe that has or will leave the Solar System (Pioneer 10, Pioneer 11, Voyager 1, Voyager 2, and New Horizons) has a Solar Power System. This leads to the question, is there a reason behind ...
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3answers
618 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....
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913 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 ...
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149 views

Redeployable solar arrays. Do they exist? or are they being worked on?

Has it ever been done, or is anyone working on, redeployable solar arrays? In other words, a solar cell array that can be deployed in space, used for a period, and then folded up again into the ship, ...
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1answer
738 views

Why are the ISS' Sequential Shunt Units not on the inside?

Recently Tim Peake and Tim Kopra carried out an EVA to replace a failed Sequential Shunt Unit, some form of electrical regulator for the solar panels, on the outside of the ISS. Why aren't these ...
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1answer
180 views

Were the ISS Solar Arrays manufactured as a set?

The solar arrays used on the ISS were launched in 4 different launches. Starting in 2000 for the first array, used on the Z-0 truss, to 2007, 2008, and 2009 for the final three. Are all 4 of them ...
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1answer
429 views

Are there solar panels available today that would last through various lunar days?

I have been working on a project to build a realistic digital model of a Moon base. I'd assumed that during the initial phase of the base, the power source would be photovoltaic panels. But now that I ...
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1answer
105 views

How well does polymer filament survive space radiation?

I am reading Medium.com's 3D Printing Is Going to Space and Made In Space is doing something very cool. However, the point of failure in a system like this seems to be the polymer strut itself - how ...
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1answer
220 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 ...
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1answer
114 views

Does the proposed Voyager Station solar power arrangement make sense?

The Gateway Foundation has proposed a rotating space station with solar panels on the "hot side" (always facing the sun)/ This is to maximize power generation and minimize heating by keeping the body ...
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1answer
155 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 ...
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1answer
84 views

Do a significant proportion of cubesats (or any at all) have articulated solar panels/sails which can be pointed at the Sun?

It appears that for early cubesats the solar panels were simply fixed flat to the sides of the spacecraft, and even deployable panels were not part of early cubesat designs. Have a significant number ...
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Any commercial communication satellite in GEO Orbit that supports 25 KW Power?

As I understand, EchosTAR-11, built by Space systems Loral, was the first 20KW Commercial satellite. (Reference: Recent Successful satellite systems- Visions for future by D.K.Sachdev).
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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 ...
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2answers
231 views

Why can't solar panels work eternally for any space probe?

I was just thinking about this that as all probes have solar panels attached to them so why do they have to shut down at the last stage, So I googled and found that dust sticks to panels because of ...
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2answers
321 views

What are low-mass ways of supplying power for a 4.5kW ion thruster?

I'm in the process of designing a spacecraft for a project, and I'm at the stage of choosing the propulsion system. I'm going to use a Boeing 702 ion thruster (requiring 4.5kW) for propulsion, to ...
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2answers
557 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 ...
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1answer
129 views

What is the benefit of rigid solar arrays over flexible ones?

I read somewhere that flexible arrays tend do waver when a satellite is rotated so it would make Earth observing satellites have 'fuzzy' pictures. But I also read that Hubble used a flexible array for ...
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1answer
225 views

Solutions to Ongoing Problems on the Solar Panel rotary joints

What are the causes of the damaged SARJ on the ISS? This occurred back in 2007, and endangers the lives of astronauts. Also, what are the solutions to this problem. Does anyone know what types of ...
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1answer
1k 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 ...
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2answers
161 views

Could Solar Cells provide Neutron shielding?

In any (deep) spacecraft, radiation shielding is paramount. Neutrons and gamma rays can only be stopped by putting mass (or distance) between source and target. It seems that one should put more ...
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2answers
182 views

Is it feasible for a future Rosetta type mission to use wireless transfer of power to Philae?

While listening to the latest updates it seems like there is a limited 60 hour battery capacity left for Philae. There seems to be some information on the web on wireless power transfer using lasers. ...
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4answers
193 views

What spacecraft relied on solar electrical power farthest from the Sun?

Question: What spacecraft relied on solar electrical power farthest from the Sun? If you like you can break it down by use case; spacecraft that used it for solar-electric propulsion (and weren't ...
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1answer
125 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 ...