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Lunt Blocking Filter Heater test results

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#1 bigdob24

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Posted 15 January 2020 - 02:14 PM

I’m bored on this cloudy cold day so I thought I would run the new BF Heater Module to see how it does.

This was not in the scope , but don’t think that will make a lot of difference. 

First test was in the house and second in my garage at more realistic temps.
I Used a digital laser thermometer for the test and got temps from the same spot for all the readings.
Easy installation with 2 screws that are supplied
Same length 3” adds .5” to width making it 2.5” and adds 1.5” to depth
does add some weight , it’s sturdy.
On / off switch and LED indicator light , charging ports and a battery
by pass to run from an external battery.
First test the room was 70 as was the heater on the BF.
After 5 min the temp was 84 degrees
10 min 90
15 min 92
20 min 94
25 min 96
30 min 97
Second test garage temp was 44 as was the heater on the BF.
After 5 min temp was 60 degrees
10 min 66
15 min 72
20 min 74
25 min 77
30 min 78
40 min 82
50 min 84
60 min 83
  After a total of 90 min the battery LED has started blinking indicating less than 10% battery life left.

This model has a battery by pass cable to run off an external battery for unlimited run time.

I’ll be happy with the run time on the battery as when it’s cold less than 90 min will be plenty of observing time for me if something is happening

Also have a new DS for my scope to test out when the sun shines , more on that another time.

 

BD

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#2 sunnyday

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Posted 15 January 2020 - 02:19 PM

hi 

 

I can't wait to see the results outside, thanks.

 

because here where I live it is colder, it can be useful, indicative.

 

thanks again 



#3 dhkaiser

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Posted 15 January 2020 - 03:57 PM

BD

Thanks for the results.  I am waiting for my module and wonder what type is the external battery connection? Cigarette lighter plug or something else?



#4 bob71741

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Posted 15 January 2020 - 04:07 PM

Nice to see some hard data for the heater; thanks much!!

 

was the final (after 30 and 60 min) ambient temperature the same as the start temp?



#5 bigdob24

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Posted 15 January 2020 - 06:09 PM

hi 

 

I can't wait to see the results outside, thanks.

 

because here where I live it is colder, it can be useful, indicative.

 

thanks again 

I also have a new DS to try and the temp tomorrow is a high of 27 and the next two sunny days are colder than that. 
My scope and equipment is stored inside so I would turn on the heater as I’m setting up.

After what I saw today in a 44 degree garage I don’t think it will have any trouble keeping up.

BD

Thanks for the results.  I am waiting for my module and wonder what type is the external battery connection? Cigarette lighter plug or something else?

The external plug is a USB connector, I’ve got a 10000 mAh battery pack that would run that heater several hours, used it to power my Quark for hours on end 

Nice to see some hard data for the heater; thanks much!!

 

was the final (after 30 and 60 min) ambient temperature the same as the start temp?

Yes, the first was just done in the house 70 degrees and the second was done in my garage and it was 44 degrees 


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#6 hopskipson

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Posted 15 January 2020 - 06:24 PM

Nice to see some practical data for this.  I'm just curious as it looks like the laser is pointed at the heater itself.  Since the blocking filter is located in the eyepiece holder I wonder if the temperature is the same.  I used a dew strap wrapped around the eyepiece holder inside a heavy sock and that seemed to work well in 50 degree weather.



#7 bigdob24

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Posted 15 January 2020 - 08:26 PM

Nice to see some practical data for this.  I'm just curious as it looks like the laser is pointed at the heater itself.  Since the blocking filter is located in the eyepiece holder I wonder if the temperature is the same.  I used a dew strap wrapped around the eyepiece holder inside a heavy sock and that seemed to work well in 50 degree weather.

 

The temp was the same on all of the white body, I would guess after initial warmup it would be well above the 40/45 degree mark . Metal will dissipate the heat out and away from the source  .

Ill try and remember to check when I get it out under the sun

BD
 


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#8 dhkaiser

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Posted 17 January 2020 - 06:35 PM

Cloudy here as well, and my Lunt Heating Module arrived today, so here are my results...

 

Beginning and ending outside temp 32* F.
IR Temp tool rated at 2% accuracy.

 

Start Clamshell 66*  BF 67*  Heating Mod 66*

5 min Clamshell 45*  BF 53*  Heating Mod 52*

10 min Clamshell 41*  BF 58*  Heating Mod 55*

15 min Clamshell 38*  BF 56*  Heating Mod 57*

20 min Clamshell 36*  BF 55*  Heating Mod 56*

25 min Clamshell 32*  BF 52*  Heating Mod 53*

30 min Clamshell 29*  BF 50*  Heating Mod 52*

35 min Clamshell 29*  BF 51*  Heating Mod 53*

 

After 35 minutes the Heating Mod was down to power level 1 out of 3.  Even though it was on 3 (67% - 100%) before taking it outside, I'm not sure it was at 100%, worth testing again.


Edited by dhkaiser, 18 January 2020 - 07:42 AM.

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#9 torsinadoc

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Posted 18 January 2020 - 09:54 AM

Mine last about 90 minutes before the battery dies

#10 dhkaiser

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Posted 18 January 2020 - 09:58 AM

I will make sure mine has a full charge next and time it tell it gives a low battery signal.



#11 dhkaiser

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Posted 19 January 2020 - 12:37 PM

Second test, full charge lasted 90 minutes until flashing indicating 10% or less charge.  I was impressed since the temp started at 14* F and ended at 15* F.  Between the two tests it looks like the heater will keep the BF about 20* warmer than the outside temp.

 

Start Clamshell 54* BF 54* Heater 54*

10 min Clamshell 36* BF 48* Heater 48*

20 min Clamshell 26* BF 39* Heater 36*

30 min Clamshell 17* BF36* Heater 32*

40 min Clamshell 14* BF 37* Heater 37*

50 min Clamshell 15* BF 35* Heater 37*

60 min Clamshell 14* BF 33* Heater 34*

70 min Clamshell 17* BF 37* Heater 41*

80 min Clamshell 14* BF 33* Heater 35*

90 min Clamshell 13* BF 33* Heater 32*


Edited by dhkaiser, 19 January 2020 - 12:42 PM.

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#12 sunnyday

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Posted 19 January 2020 - 12:59 PM

Second test, full charge lasted 90 minutes until flashing indicating 10% or less charge.  I was impressed since the temp started at 14* F and ended at 15* F.  Between the two tests it looks like the heater will keep the BF about 20* warmer than the outside temp.

 

Start Clamshell 54* BF 54* Heater 54*

10 min Clamshell 36* BF 48* Heater 48*

20 min Clamshell 26* BF 39* Heater 36*

30 min Clamshell 17* BF36* Heater 32*

40 min Clamshell 14* BF 37* Heater 37*

50 min Clamshell 15* BF 35* Heater 37*

60 min Clamshell 14* BF 33* Heater 34*

70 min Clamshell 17* BF 37* Heater 41*

80 min Clamshell 14* BF 33* Heater 35*

90 min Clamshell 13* BF 33* Heater 32*

thank you for the result, I wonder how will react this bf heater to the temperatures where I live, it often does here temperatures near 0 f and even lower.

 

ps, what do you mean by Clamshell?



#13 dhkaiser

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Posted 19 January 2020 - 01:07 PM

The clamshell is the clamp that holds the telescope to the dovetail, used those measurements as a control.

 

thank you for the result, I wonder how will react this bf heater to the temperatures where I live, it often does here temperatures near 0 f and even lower.

 

ps, what do you mean by Clamshell?


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#14 bigdob24

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Posted 19 January 2020 - 04:26 PM

Second test, full charge lasted 90 minutes until flashing indicating 10% or less charge.  I was impressed since the temp started at 14* F and ended at 15* F.  Between the two tests it looks like the heater will keep the BF about 20* warmer than the outside temp.

 

Start Clamshell 54* BF 54* Heater 54*

10 min Clamshell 36* BF 48* Heater 48*

20 min Clamshell 26* BF 39* Heater 36*

30 min Clamshell 17* BF36* Heater 32*

40 min Clamshell 14* BF 37* Heater 37*

50 min Clamshell 15* BF 35* Heater 37*

60 min Clamshell 14* BF 33* Heater 34*

70 min Clamshell 17* BF 37* Heater 41*

80 min Clamshell 14* BF 33* Heater 35*

90 min Clamshell 13* BF 33* Heater 32*

In your test in those temps how did the image look?

Did it maintain good contrast and detail through the whole session?

We have sunshine predicted for Tuesday and a high of 29, I may try to get out if the wind is out of right direction for me.

Its hard to get out in the cold

BD



#15 torsinadoc

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Posted 19 January 2020 - 06:10 PM

In your test in those temps how did the image look?
Did it maintain good contrast and detail through the whole session?
We have sunshine predicted for Tuesday and a high of 29, I may try to get out if the wind is out of right direction for me.
Its hard to get out in the cold
BD


Mine didn’t seem to hold contrast today. Granted conditions were terrible (30sF,seeing 1/5 and high clouds). I checked and it was on. Can’t say that it functions any better than wrapping dew heater strap around the blocking filter

#16 dhkaiser

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Posted 19 January 2020 - 06:14 PM

No looking at images, clouded out.  I doubt I will be doing a lot of observing in those temps with the BF temp in the 30's.  We will see.

 

In your test in those temps how did the image look?

Did it maintain good contrast and detail through the whole session?

We have sunshine predicted for Tuesday and a high of 29, I may try to get out if the wind is out of right direction for me.

Its hard to get out in the cold

BD



#17 bigdob24

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Posted 19 January 2020 - 08:32 PM

Mine has the capability to plug into an external power supply. I would guess that with a constant power supply the temp wouldn’t drop after an hour or so.

I need it to be around 30+ and wind anywhere but out of the south. I can setup right in my garage at the door , but first I need a sun.

BD


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#18 dhkaiser

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Posted 26 January 2020 - 03:49 PM

First use of the heater under sunlight.  50 min observing in 43* F temp, heater on all the time.  Had the most detail visible so far, very pleased.



#19 bigdob24

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Posted 26 January 2020 - 08:30 PM

Nice to hear it all works as it should 

BD




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