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Whr Figures, From various sources
djellison
post Feb 6 2006, 03:39 PM
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I've been looking at the new entries at the PDS for WHR quotes, to compile as good a list of actual quoted Whr values as I can......so if you find one, add it to this thread and I'll update this post with figures....any source as long as it's an actual figure and an actual sol.


B0515 - 418 Whrs
B0522 - 462 Whrs
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helvick
post Feb 16 2006, 09:42 PM
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These are all the power generation numbers I have from the Rover updates:
http://marsrovers.jpl.nasa.gov/mission/status_spiritAll.html
http://marsrovers.jpl.nasa.gov/mission/sta...rtunityAll.html

Most of these are specific references but some are not absolutely specific e.g. for the Spirit Sol 219 to 231 update the power level is quoted as "Power is always a major concern as available energy fluctuates between 300 and 400 watt-hours per sol" so I've taken that somewhat arbitrarily as 300whr on Sol 219 and 400whr on Sol231.

Opportunity
Sol Whr
639 720
633 528
630 496
629 470
628 479
627 593
526 650
524 500
456 650
450 620
339 836
333 630
321 546
312 840
316 730
257 700
250 660
199 610
100 610

Spirit
Sol Whr
575 900
572 875
422 800
421 700
420 600
419 400
418 350
284 400
231 400
219 300
204 288
203 370
80 700
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helvick
post Feb 16 2006, 09:59 PM
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New Scientist Rover Updates.
All of these are a bit approximate in terms of dates and exact power levels.

New Scientist 16 Feb 2006
Opportunity
Sol 734 600whr
Spirit
Sol 754 450 whr
Sol 704 550whr

New Scientist 23 December 2004
Opportunity
~Sol 310 "over 900 whr".
Spirit
~Sol 330 600 whr

New Scientist 30 October 2004
Opportunity
June 2004(~Sol 126 to Sol 155) "dropped to 500-600 whr"
Mid September 2004 (~Sol 230) 700whr
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helvick
post Feb 16 2006, 10:13 PM
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Steve Squyres Mission To Mars
Jan 3 2006
Spirit
Sol 711 500whr

August 31 2005
Spirit
Sol 581 956whr

April 17 2005:
Spirit
Sol 457 "Over 800 whr"

And I found this in the April 17 2005 update - "We think that the rovers can't survive at power levels much lower than 280 watt-hours". That's where the minimum power level reference comes from.
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helvick
post Feb 16 2006, 11:02 PM
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The Planetary Society Rover updates.
There are quite a few power numbers quoted but only a handful are specific.

TPS MER Update November 30 2005
Opportunity
Sol 638 720 whr

TPS MER Update October 27 2005
Spirit
~ Sol 645 "High 700's"
Opportunity
~ Sol 625 "High 600's"

TPS MER Update September 22 2005
Spirit
~Sol 621 885whr
Opportunity
~ Sol 601 630whr

TPS MER Update July 28 2005
Spirit
~Sol 557 600-650 whr
Opportunity
~Sol 537 600-650 whr

TPS MER Update June 5 2005
Opportunity
Sol 463 620whr
Sol 476 650whr

TPS MER Update March 25 2005
Spirit
~Sol 435 860whr
~Sol 421 800whr
Opportunity
~Sol 401 "the 600's"
There is also a note that Spirit hit a minimum of 550 "for a while"

TPS MER Update 9 December 2004
Opportunity
~Sol 310 "800-900 whr"

TPS MER Update 22 October 2004
Spirit
~Sol 176 ~400whr
~Sol 236 - Sol 285 "400 - 500whr"
Opportunity
~Sol 126 - Sol 215 "500 - 600whr"
~Sol 216 - Sol 235 "averaging 660whr"
~Sol 236 - "than 700whr"

TPS MER Update 19 August 2004
Spirit
~Sol 223 400whr
Opportunity
~Sol 202 550-600whr

TPS MER Update 3 June 2004
Opportunity
~Sol 128 ~500whr
Note This mentions that Deep Sleep saves Opportunity ~170 whr per sol.
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djellison
post Mar 9 2006, 08:12 PM
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Just got word from JB

"Spirit is down to about 360-370 Whr and Opportunity is down to about
540-55 Whr"

Doug
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Bob Shaw
post Mar 9 2006, 08:35 PM
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QUOTE (djellison @ Mar 9 2006, 08:12 PM) *
Just got word from JB

"Spirit is down to about 360-370 Whr and Opportunity is down to about
540-55 Whr"

Doug



Time for a graph. anyone?

Bob Shaw


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helvick
post Mar 9 2006, 09:12 PM
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QUOTE (Bob Shaw @ Mar 9 2006, 08:35 PM) *
Time for a graph. anyone?

Here ya go
Spirit
Attached Image


Power is down significantly compared to my prediction at the last check point. My previous estimate had it at 416whr for Sol 774. At this rate it would drop below 300 whr on Sol 829 and below 280 on Sol 849. If a more hospitable environment isn't ound she would drop to 245whr between sol 923 and 938

Opportunity

Attached Image

Opportunity is also down somewhat - I had anticipated it would be at 571 whr at this point . At this rate the minimume power level looks to be 405whr between Sol 902 and 924.

The lower power levels for both rovers might indicate that dust levels are up (which would be unexpected I think) or it might just be unfavourable orientation.
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Nirgal
post Mar 9 2006, 10:03 PM
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Opportunity

Attached Image

Opportunity is also down somewhat - I had anticipated it would be at 571 whr at this point . At this rate the minimume power level looks to be 405whr between Sol 902 and 924.

[/quote]

So the Trek to Victoria could become a race against the time. If this trend (dust-induced power loss dropps more rapidly than predicted/expected) then we will hit the "operational limit" in significantly less than 100 Sols.
So in order to rech the Victoria slopes in time we should be really making not much less than 20 meters per Sol of driving *on average* which seems pretty fast IMO unsure.gif

Any guesses about the average meters per day Oppy could realistically make in the terrain towards Victoria ?

And, ehr yes: keep up praying for those cleaning events wink.gif
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helvick
post Mar 9 2006, 10:43 PM
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QUOTE (Nirgal @ Mar 9 2006, 10:03 PM) *
So the Trek to Victoria could become a race against the time. If this trend (dust-induced power loss dropps more rapidly than predicted/expected) then we will hit the "operational limit" in significantly less than 100 Sols.

At the moment I still don't think that Opportunity will fall below a level at which it can still drive for at least an hour a day but if it is dust deposition that is causing this rather than orientation or an increase in Tau then who knows.
QUOTE (Nirgal @ Mar 9 2006, 10:03 PM) *
Any guesses about the average meters per day Oppy could realistically make in the terrain towards Victoria ?

Depends on the type and density of dunes and we don't really know what's ahead yet. On a good pavement she should be able to cover 20-40m even when power drops to 400whr. Around Sol 320/325 she covered 60-80m on sols when she was generating not much more power than she is now (540-600whr)
QUOTE (Nirgal @ Mar 9 2006, 10:03 PM) *
And, ehr yes: keep up praying for those cleaning events wink.gif

Oh yes.
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alan
post Jun 23 2006, 04:02 PM
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From the laest update
QUOTE
SPIRIT UPDATE: Spirit Continues Work Even As Martian Winter Deepens - sol 867-873, June 21, 2006:

Spirit continues to be productive, even as winter conditions harshen. Spirit now receives about one-third as much solar energy as the rover received in mid-2005 while on "Husband Hill." That is, the rover now receives about 310 watt-hours per Martian day, or sol,

Helvick , does your projection account for Spirits current tilt?
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helvick
post Jun 24 2006, 01:27 PM
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QUOTE (alan @ Jun 23 2006, 05:02 PM) *
Helvick , does your projection account for Spirits current tilt?

No. My estimates are based on a horizontal orientation and have never taken tilt into account which is a major flaw that I never got round to fixing. Spirit's current tilt adds around 15% extra power to those numbers so the current estimated value from my last chart of around 270whr would go up to around 310whr which agrees pretty well with the reported value. The minimum values from Sol 923-938 will be around 285whr which is very low but higher than the worst that was seen in the climb up Husband Hill.
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dilo
post Jun 24 2006, 02:54 PM
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Helvick, is your estimated output for sol 923-938 considering also further dust deposition?
If not, I'm a little worried...


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helvick
post Jun 24 2006, 03:01 PM
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QUOTE (dilo @ Jun 24 2006, 03:54 PM) *
Helvick, is your estimated output for sol 923-938 considering also further dust deposition?
If not, I'm a little worried...

All of my "projections" include a 0.18% cumulative degradation in performance per sol to account for dust deposition so a minimum of around 285whr/sol give or take a couple of watts should be right unless she goes and falls off that rock.
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dilo
post Jun 24 2006, 03:27 PM
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thanks!


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