All Questions

Tagged with
Filter by
Sorted by
Tagged with
6
votes
1answer
254 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 ...
11
votes
1answer
205 views

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 ...
1
vote
0answers
35 views

Why are the big solar panels on the ISS orientated away from the Sun? [duplicate]

While looking at this picture below from another question I notice all the panels are not facing the Sun. Why is that?
2
votes
1answer
188 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 ...
2
votes
0answers
68 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 ...
16
votes
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
votes
1answer
300 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 ...
4
votes
2answers
546 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 ...
6
votes
1answer
449 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 ...
4
votes
1answer
698 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 ...
3
votes
1answer
213 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 ...
4
votes
1answer
177 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 ...
8
votes
1answer
4k views

Why does the ISS not use the most efficient solar panels available?

In this question, Geoffc's answer stated that the ISS solar arrays are about 14% efficient. Higher efficiency panels were available when these arrays were manufactured. Given the high cost per pound ...
8
votes
1answer
472 views

What is the difference in solar panel efficiency between Solar Impulse & ISS?

Solar Impulse is on target to circle the world. Presumably Solar Impulse has the most current and efficient solar cells available, while those on the ISS range between 5 and 10 years old. How do the ...