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Author Topic: What the Buoys are telling  (Read 331846 times)

Pmt111500

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Re: What the Buoys are telling
« Reply #1250 on: March 02, 2017, 03:31:08 PM »
Up in the sky Venus keeping company to the buoy.
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Oddmonk

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Re: What the Buoys are telling
« Reply #1251 on: March 02, 2017, 05:13:28 PM »
Up in the sky Venus keeping company to the buoy.

Yes.

Andreas T

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Re: What the Buoys are telling
« Reply #1252 on: March 04, 2017, 11:49:04 PM »
The photovoltaic panels seem to be charging the batteries enough now to keep the buoy running through the hours of darkness. But clear skies also mean heat loss with little downward IR as seen in the temperature readings.

jdallen

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Re: What the Buoys are telling
« Reply #1253 on: March 05, 2017, 01:28:43 AM »
The photovoltaic panels seem to be charging the batteries enough now to keep the buoy running through the hours of darkness. But clear skies also mean heat loss with little downward IR as seen in the temperature readings.
Temperatures that low is good.  If the ice itself is chilled as well, that's 1-2CM/day of growth potential, assuming ice of at least 2M thickness.  The $64 question is how long we'll have these wonderful temperatures, and if we're getting similar elsewhere over large enough stretches of the basin.
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Gray-Wolf

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Re: What the Buoys are telling
« Reply #1254 on: March 05, 2017, 10:36:34 AM »
The photovoltaic panels seem to be charging the batteries enough now to keep the buoy running through the hours of darkness. But clear skies also mean heat loss with little downward IR as seen in the temperature readings.
Temperatures that low is good.  If the ice itself is chilled as well, that's 1-2CM/day of growth potential, assuming ice of at least 2M thickness.  The $64 question is how long we'll have these wonderful temperatures, and if we're getting similar elsewhere over large enough stretches of the basin.

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jdallen

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Re: What the Buoys are telling
« Reply #1255 on: March 05, 2017, 06:57:37 PM »
The photovoltaic panels seem to be charging the batteries enough now to keep the buoy running through the hours of darkness. But clear skies also mean heat loss with little downward IR as seen in the temperature readings.
Temperatures that low is good.  If the ice itself is chilled as well, that's 1-2CM/day of growth potential, assuming ice of at least 2M thickness.  The $64 question is how long we'll have these wonderful temperatures, and if we're getting similar elsewhere over large enough stretches of the basin.

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Eli81

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Re: What the Buoys are telling
« Reply #1256 on: March 06, 2017, 10:26:28 PM »
Indeed, a nice stretch of operation - going on 5 days now. Being a battery person, you can actually "see" the cold temperatures in the battery voltage - peaking at 16V! That's a tad high for a lead acid. That will come down as the temperatures and therefor battery internal resistance drops.

Almost -50C last night again.

Does look quite chilly...

Lord M Vader

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Re: What the Buoys are telling
« Reply #1257 on: March 07, 2017, 07:06:57 PM »
Hey folks, do you have this site showing at least 8 bouys temperatures over the Canadian Arctic? Zoom in and out and you will find mintemps ranging from -2F to -40F over the open Arctic basin! And also info about the bouys temps over the last 7 days!

http://www.wrh.noaa.gov/map/?&zoom=6&center=62.451405884537564,-155.6982421875&basemap=OpenStreetMap&boundaries=true,false&obs=true&obs_type=weather&elements=temp,wind,gust&obs_popup=false&obs_density=3

Andreas T

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Re: What the Buoys are telling
« Reply #1258 on: March 12, 2017, 11:47:33 PM »
The latest blast of (relatively) warm humid air which entered  the arctic from across east siberia has reached Obuoy14.
Temperature is up above -15degC.
By the way: checking temperatures at Resolute suggest that the low temperatures seen when the buoy "woke up" were the lowest of the winter.

Andreas T

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Re: What the Buoys are telling
« Reply #1259 on: March 13, 2017, 11:57:41 PM »
clearer sky today brings a slight drop in temperature. Cloudiness can also be seen by lower battery voltage when PV panels don't deliver much charging current.

Eli81

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Re: What the Buoys are telling
« Reply #1260 on: March 15, 2017, 01:34:09 AM »
Woohoo! They have updated the movie. 2017 starts at about 14:10.

Sunset in the Arctic...

Watching_from_Canberra

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Re: What the Buoys are telling
« Reply #1261 on: March 16, 2017, 09:20:01 AM »
What's the second colour on the battery graph?  Lithium batteries starting to take charge?
http://obuoy.datatransport.org/monitor#buoy14/batteries

Eli81

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Re: What the Buoys are telling
« Reply #1262 on: March 17, 2017, 05:56:24 AM »
The lithium banks are primary (non-rechargeable) batteries.

I'm thinking it's temperature related. The lithium bank is dead, but it's voltage will vary based on ambient temperature. Colder temperatures will lower cell voltages, and warmer temperatures will raise them.

Either that or it's due to bank loading - over the winter, the systems would have been trying to draw from the lithium bank, but as mentioned its dead, so the voltage would collapse rather than support any load. Now that the lead-acid is taking a charge, they're completely unloaded.