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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Initially Posted - 02/28/2007 :  15:27:52  Show Profile
I am computing the electric needs of my boat in order to determine what amount of battery power I need. I have the data for my depth finder, speed meter, GPS Chartplotter, and Autopilot. Now I need the AMP draw for the interior lights, running lights, anchor light, and propane solenoid. Do any of you have that information? Thanks.


We cannot direct the winds but we can adjust our sails.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 02/28/2007 :  15:54:05  Show Profile  Visit Frank Hopper's Homepage
I am a simpleton, I would just buy the biggest batteries that fit and call it good.
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 02/28/2007 :  17:09:26  Show Profile
Well, I used to be a simpleton but I'm trying hard to be a genius. Plus, I plan to go with AGM batteries and, at $200 each, I would prefer not to over buy. And I would like to know ahead of time what my ability to be away from shore power is and what options I have. So, while I appreciate the "all that can fit" approach I would like to be a little more analytical this time.
Edited by - Nautiduck on 02/28/2007 17:10:39
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mashedcat
Navigator

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USA
194 Posts
Response Posted - 02/28/2007 :  17:36:21  Show Profile
fluorescent light 0.7 amp
incandescent lt. 2.1 amp
anchor lt 0.8 amp
gas solenoid negligible
gas detector 0.3
multiply each one by the hrs of use and the number of each item you have aboard to get the amp hrs
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johnsonp
Admiral

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USA
606 Posts
Response Posted - 02/28/2007 :  19:13:04  Show Profile
<font color="blue"><font size="4"><font face="Comic Sans MS">Well at least I'm not responding to this post 6 years later.

Use a volt meter which is also an Amp meter and disconect the positive lead on the battery.
Switch the volt meter to Amps.
Connect the positive lead of the volt meter to the positive post on the battery.
Connect the negative lead on the volt meter to the positive battery cable.
Switch on each device and read the Amps.

paulj C250 WK # 719</font id="Comic Sans MS"></font id="size4"></font id="blue">
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mashedcat
Navigator

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USA
194 Posts
Response Posted - 02/28/2007 :  23:01:56  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Well at least I'm not responding to this post 6 years later.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

??
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mashedcat
Navigator

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USA
194 Posts
Response Posted - 02/28/2007 :  23:19:53  Show Profile
i believe pauls way is the better way to determine your amperage draw.
mine came from a table. dont forget to multiply the hours you use the device each day
Edited by - mashedcat on 02/28/2007 23:21:10
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kevinmac
Admiral

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USA
732 Posts
Response Posted - 03/01/2007 :  16:52:27  Show Profile
No such thing as too much battery capacity... ;-)
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.