20 watts=how many amps ? - GL1800Riders
Reply
 
LinkBack Thread Tools
post #1 of 24 (permalink) Old 10-28-2008, 12:42 AM Thread Starter
Seasoned Member
 
Join Date: Nov 2003
Location: Wi. Rib Lake
Posts: 17,158
20 watts=how many amps ?

i know next to nothing about electricity but am interested in adding heat to the stock 02 seat

found what appears to be a nice seat heat kit on ebay for $50 delivered

they say it puts out up to 20 watts of heat and comes with a hi-lo switch

would like to hook it up to the 5 amp accessory terminals on the wing but since i already have Dual Star grip heaters hooked up there i am wondering if they will be able to handle the additional load ?

ehcycledude@yahoo.com
02 GL1800 yellow 465,000 smiles
Rode my bike to Trailer Week
cycledude is offline  
Sponsored Links
Advertisement
 
post #2 of 24 (permalink) Old 10-28-2008, 01:19 AM
Seasoned Member
 
Dream Catcher's Avatar
 
Join Date: Oct 2006
Location: SW Ohio
Posts: 3,033
Re: 20 watts=how many amps ?

Hey Mike....
20 watts at the typical 14 volts DC coming from the running alternator regulator
would be approximately 20/14 or 1.43 amps.
The heat from the unit would be measured in BTU's I imagine.
The electrical power used by the heater would be 20 watts.
If they specified that power at the maximum, as it should be, then that 1.43 amps would be
on the high heat setting of the switch.
The low heat setting would probably be a setting of something more than half of that max.,
as heater elements stop producing heat when the amps get too low.

07-Burnt Orange-ABS/NAV CSC TRIKE
Dream Catcher is offline  
post #3 of 24 (permalink) Old 10-28-2008, 01:32 AM Thread Starter
Seasoned Member
 
Join Date: Nov 2003
Location: Wi. Rib Lake
Posts: 17,158
Re: 20 watts=how many amps ?

THANKS Dream Catcher

so it sounds like the seat heater and heated grips combined will not come anywhere near the 5 amp limit of the accessory terminals, i will probably order the kit tommorrow, heated seat should be great up here in wisconsin

ehcycledude@yahoo.com
02 GL1800 yellow 465,000 smiles
Rode my bike to Trailer Week
cycledude is offline  
post #4 of 24 (permalink) Old 10-28-2008, 02:34 AM
Seasoned Member
 
Lone Ranger's Avatar
 
Join Date: Nov 2005
Location: H. R. 3011
Posts: 4,079
Re: 20 watts=how many amps ?

Simple formula I use:

watts divided by volts = amps or

volts times amps = watts

[SIGPIC][/SIGPIC]
Lone Ranger is offline  
post #5 of 24 (permalink) Old 10-28-2008, 04:54 AM
Seasoned Member
 
Auswing's Avatar
 
Join Date: Sep 2006
Location: Bay of Plenty New Zealand
Posts: 1,422
Re: 20 watts=how many amps ?

The battery is listed as 12V 18 Ah. It is incorrect to calculate the current based on 14.4 volts.
The workshop manual also states that it is fully charged at 13 - 13.2 Volts.
Current should be calculated using a nominal 12 Volts.

VOLTAGE (20C/68F):
Fully charged: 13.0 13.2 V
Under charged: Below 12.3 V


14 volt batteries exist, but the Wing does not have one.

Trev.

"If everything seems under control, you're just not going fast enough".
(Mario Andretti)

Silver 06 - since traded for 2013 F700GS BMW

Elite Camper Trailer - looking for a new home
Auswing is offline  
post #6 of 24 (permalink) Old 10-28-2008, 07:47 AM
Contributing Member
 
WingCdr's Avatar
 
Join Date: Oct 2008
Location: Glos, United Kingdom
Posts: 38
Re: 20 watts=how many amps ?

Quote:
Originally Posted by Auswing
The battery is listed as 12V 18 Ah. It is incorrect to calculate the current based on 14.4 volts.
The workshop manual also states that it is fully charged at 13 - 13.2 Volts.
Current should be calculated using a nominal 12 Volts.

VOLTAGE (20C/68F):
Fully charged: 13.0 13.2 V
Under charged: Below 12.3 V


14 volt batteries exist, but the Wing does not have one.

Trev.
Auswing is correct. Alternator and battery voltages may be over 12V when you put a meter on 'em but will drop to around this nominal 12V value when in use/under load. The bike is a 12V vehicle and everything should be calculated on that basis.

Formulae:
V=IR where (V)oltage equals (I) current [amps] * (R)esistance [ohms]

thus R=V/I etc

P=VI where (P)ower [watts] equals (V)olts * (I) current [amps]

thus I=P/V or V=P/I etc

P=I2 R where (P)ower [watts] equals (I) current [amps] squared * (R)esistance [ohms]

thus.....you get the picture - change the side [of the equals sign] change the operator - haven't got a square root symbol for this font and bulletin board!!

DB - WingCdr
Prov Anti Chrome #1918

GL1800 Goldwing & XR125

Previously.....
FJS600 Silverwing
CBR1100XX Blackbird
CBR1000F
NTV650
XL125R
KE175
CB100N
WingCdr is offline  
post #7 of 24 (permalink) Old 10-28-2008, 08:46 AM
Seasoned Member
 
Join Date: Aug 2007
Location: Anderson In.
Posts: 887
Re: 20 watts=how many amps ?

Please explain why my volt meter reads 14 at idle and 14 + cruising? It's an 08.
Thanks

Jim
James Bertuca is offline  
post #8 of 24 (permalink) Old 10-28-2008, 08:52 AM
Seasoned Member
 
LD_RIDER's Avatar
 
Join Date: Feb 2004
Location: Maine
Posts: 3,855
Re: 20 watts=how many amps ?

My guess is that the alternator is charging the bike. Check the voltage with the alternator not charging (bike is off) and see what you get. The Goldwing alternator will begin charging at around 800 engine rpms...

Rob in Maine
IBA #540

Honda NC700Xd
Garmin 590LM
3gal Aux Fuel
Givi Panniers/Topbox
LD_RIDER is offline  
post #9 of 24 (permalink) Old 10-28-2008, 10:42 AM
Seasoned Member
 
DrtiBird's Avatar
 
Join Date: Dec 2003
Location: Gainesville, GA
Posts: 1,596
Re: 20 watts=how many amps ?

Quote:
Originally Posted by cycledude
i know next to nothing about electricity but am interested in adding heat to the stock 02 seat

found what appears to be a nice seat heat kit on ebay for $50 delivered

they say it puts out up to 20 watts of heat and comes with a hi-lo switch

would like to hook it up to the 5 amp accessory terminals on the wing but since i already have Dual Star grip heaters hooked up there i am wondering if they will be able to handle the additional load ?
cycledude,
To eliminate your concerns, use a relay(s) that takes power directly from the battery (fused) for both the grips and the seat. The power to trigger/operate the relay(s) would come from the accessory terminal. Radio Shack has a good selection of 12v relays.

As far as the low side of the seat heater goes, it depends on how the heat is reduced. My old grip heaters had a single heating element and used a large resistor to cut the voltage to the heaters thus reducing the heat. That resistor did nothing to reduce the power that was used.

The newer grip heaters (Dual Star & Elect Connection) use heaters with dual elements; both are on for high and only one for low. With these the low setting actually uses less power.

Heated clothing uses a controller (HeatTroller?) that actually pulses the 12v to the clothing. For warmer clothing it sends 12v to the elements longer, with max heat gained with a constant 12v. It's basically an electronic on/off switch.

Just more info for your to consider.

Cruise On,
Ron
2001 FLHTCUI - Scarlet Red/Birch White
2003 GL1800 - Candy Red
2005 Thunderbird - Inca Gold
2011 Shelby GT500 - Red/W

DrtiBird is offline  
post #10 of 24 (permalink) Old 10-28-2008, 03:34 PM
Seasoned Member
 
Stan Wright's Avatar
 
Join Date: Dec 2006
Location: Bedford, IN
Posts: 431
Re: 20 watts=how many amps ?

There's not really a wrong answer when using 12V or 14V to calculate the current draw. When the bike is running the alternator is putting out around 14V, and when it's off the battery is supplying around 12V. Either way the calculated current isn't that much different:

20 watts @ 14V = 1.43 amps
20 watts @ 12V = 1.67 amps

When I calculate current draw I like to use 12V because it gives me a small safety margin over the actual draw at 14V.

I agree with DrtiBird about using a relay. It wouldn't take much of a current spike to toast that 5 amp fuse at an inopportune time.

My Goldwing page

Darksider #223

My trips
Stan Wright is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the GL1800Riders forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome