[Rhodes22-list] Raven Energy Budget II

[Bill Effros]

Peter,

I don't have time right now, so please excuse the brusque (Meltzer?) answer.

Based on my actual experience with the Link-10 there is no way this 
chart is even close to actual experience.  To take an easy example--we 
don't carry enough water on board to use a freshwater pump for 6 hours a 
day.  Everything else falls into essentially the same category.

When I turn on all my cabin lights--for no good reason, just to test, 
and leave my stereo on all the time, and burn as much electricity as I 
can, I rarely use more than 15 amp hours in any given 24 hour period.  
But, in fact, I don't sail in order to read.  I like to preserve my 
night vision at night, and generally burn red leds--which require only a 
pitiful amount of electricity.

I'm with Wally on this deep cycle, starter battery, switch crap.  It 
simply doesn't apply to us.  KISS!!!!  I have never ever come close to a 
problem, and if I ever did I could always start my engine manually.  The 
engine would then run my anchor lights or any other critical component.  
(PS -- I don't use anchor lights most of the time in designated 
anchorages--they are not required.--When I do use them, I again use LEDs.

Even if it were possible to draw 41.5 amps a day through our equipment, 
that does not mean you need a minimum of 83 amps of battery rating per 
day. ("Don't draw down more than 50%...etc.")  You are piling one idiot 
factor on top of the next, using rules of thumb that are just plain 
wrong as regards our electricity usage on our boats. 

Basically you've either got to spring for a Link-10 to see what's really 
going on, or believe Wally who correctly understands all of this stuff 
intuitively.  All the rest is throwing out good money that would much 
better be spent elsewhere.

I'm with Wally on AGM batteries, too.  Batteries are all made by the 
same small group of manufacturers.  They are all good.  The cheapest are 
the best value. 

The only wild card is an auto tiller which I have not tested, which does 
use a lot of electricity in a way that can sap batteries.

Bill Effros


Michel Meltzer wrote:

>Raven Energy Budget				
>	amps	hrs	amp/hr	
>Use of Power-			out	
>				
>anchor light	0.8	9.5	7.6	
>cabin fan	0.2	4.0	0.8	
>cabin lights (25 w ea)	2.1	5.0	10.5	
>compass light	0.7	2.0	1.4	
>depth sounder	0.1	8.0	0.8	
>speed log	0.2	8.0	1.6	
>pump freshwater	6.0	0.3	1.8	
>running lights	2.5	2.0	5.0	
>spot light	10.0	0.3	3.0	
>cd player	1.0	4.0	4.0	
>VHF receive	0.5	8.0	4.0	
>VHF transmit	5.0	0.2	1.0	
>				
>daily consumption			41.5	
>				
>				
>	amp/hour	availability		days between
>Source of Power-	at 20	45.0%		recharge
>				
>2 Trojan deep cycle  group 27 SCS200	230.0	103.5	41.5	2.5
>2 Trojan deep cycle  group 31 SCS225	260.0	117.0	41.5	2.8
>
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>>-----Original Message-----
>>From: rhodes22-list-bounces at rhodes22.org [mailto:rhodes22-list-
>>bounces at rhodes22.org] On Behalf Of Michel Meltzer
>>Sent: Friday, February 03, 2006 8:36 AM
>>To: rhodes22-list at rhodes22.org
>>Subject: [Rhodes22-list] Raven Energy Budget
>>
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>>Raven Energy Budget
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>>anchor light
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>>7.6
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>>cabin fan
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>>0.2
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>>cabin lights (25 w ea)
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>>compass light
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>>0.7
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>>depth sounder
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>>speed log
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>>pump freshwater
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>>6.0
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>>running lights
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>>2.5
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>>spot light
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>>10.0
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>>cd player
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>>VHF receive
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>>0.5
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>>VHF transmit
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>>5.0
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>>2 Trojan deep cycle  group 27 SCS200
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>>41.5
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>>2.5
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>>2 Trojan deep cycle  group 31 SCS225
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>>260.0
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>>41.5
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>>2.8
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>>__________________________________________________
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>>    
>>
>
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>
>  
>