Whr Figures, From various sources |
Whr Figures, From various sources |
Feb 6 2006, 03:39 PM
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#1
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
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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Jul 15 2006, 12:50 PM
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#2
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Junior Member Group: Members Posts: 46 Joined: 14-January 06 Member No.: 645 |
From 14 July Spirit Update: sol 897-904 Solar array input down to 280 whrs
Hang in there buddy. |
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Jul 15 2006, 02:23 PM
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#3
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
From 14 July Spirit Update: sol 897-904 Solar array input down to 280 whrs I've noted elsewhere that spirit appears to be losing power generating capacity at a slightly faster rate than I expected when assuming a constant rate of power loss due to dust of 0.18% per Sol. This latest reported whr number seems to indicate that we might be seeing the effect of local winds picking up and increasing the rate at which dust is being deposited on the panels but it could also be that Tau is increasing earlier this year than last. From Sol 811 to Sol 853 panel efficiency decreased by ~0.08% per sol. From Sol 853 to Sol 877 panel efficiency decreased by ~0.10% per sol. From Sol 877 to Sol 891 panel efficiency decreased by ~0.33% per sol. From Sol 892 to Sol 899 panel efficiency decreased by ~0.41% per sol. If that rate continues then Spirit will be in a very bad way. After mid winter insolation increases at less than 0.4% per Sol and power generation capacity would just continue to decline rather than picking up again as summer rolls in. |
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Jul 15 2006, 03:13 PM
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#4
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
...spirit appears to be losing power generating capacity at a slightly faster rate than I expected when assuming a constant rate of power loss due to dust of 0.18% per Sol. I wonder if the computer trouble that Spirtit had in the first days of its mission, which lead to a near complete discharge of the battery, reduced the battery life. I also wonder if plans are in the works for an attempt at repositioning Spirit to get a better angle to the sun, or if it has been decided to let Spirit live or die as it sits. The danger of repositioning is that it could unintentionally lead to a worse and perhaps deadly power situation. |
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Jul 15 2006, 03:46 PM
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#5
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
I wonder if the computer trouble that Spirtit had in the first days of its mission, which lead to a near complete discharge of the battery, reduced the battery life. It may have but I think we've established that the Lithion batteries used by the MER's should be good for a few thousand Sols unless temperatures drop so far that they actually get damaged. The couple of weeks of trouble at the start probably didn't do Spirit's any good but I don't think they damaged it either. I also wonder if plans are in the works for an attempt at repositioning Spirit to get a better angle to the sun, or if it has been decided to let Spirit live or die as it sits. The danger of repositioning is that it could unintentionally lead to a worse and perhaps deadly power situation. Spirit has already been manoeuvred into a position with one wheel perched on a rock giving her a very favourable northerly tilt that has increased the power she generates by about 20%. Without that tilt she would currently be generating only 220-230 whr or so per sol. An ideal tilt could increase the power gain by a further 10% or so but it would be an incredibly risky exercise. I don't think anyone would try it now, if they got it wrong and she ended up horizontal it might be impossible to recover from. |
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