fuel consumption - SailNet Community
LinkBack Thread Tools
post #1 of 4 Old 07-26-2012 Thread Starter
Junior Member
Join Date: Jul 2012
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
fuel consumption

i was searching forum and google could not find so here my "question"

how to convert fuel consumption from g/kWh to Lit/h

should i sum "power kw x g/kwh" multiply or divide by the density of the fuel to get Lit/h


Fuel consumption 215 g/kWh

Rated power is 100 kW.

At 100 kW, fuel consumptuion is...

215 g/kWh x 100kW = 21500 g/h or 21.500 kg/h

0.85 kg/l is a typical figure for diesel

21.500 kg/h x 1 L/0.85 kg = 18.3 L/h ( 4.025 Imperial gallons or 4.834 US gallons)

should i this "21.500kg/h" multiply or devide by 0.85 to get Lit/h


Last edited by lola rose; 07-26-2012 at 06:57 AM.
lola rose is offline  
Sponsored Links
post #2 of 4 Old 07-26-2012
Senior Member
lajimo's Avatar
Join Date: Sep 2011
Posts: 187
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
fuel consumption

The units have to cancel so it looks like division is what you need as you showed in the example. I'm not sure about the multiplication by rated power however - do you really use that or is it a maximum value?
lajimo is offline  
post #3 of 4 Old 07-26-2012
Senior Member
JimsCAL's Avatar
Join Date: May 2007
Location: Glen Cove, NY
Posts: 4,552
Thanks: 5
Thanked 205 Times in 197 Posts
Rep Power: 13
Re: fuel consumption

You have it correct. Multiply by the power in kW then divide by the density in g/l. Note that you if you want consumption at other than rated power, use the actual power and the fuel rate at that power. The fuel rate will vary somewhat with power, though not much once above about 1/3 rated power.
JimsCAL is online now  
post #4 of 4 Old 07-27-2012 Thread Starter
Junior Member
Join Date: Jul 2012
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Re: fuel consumption

thanks for your reply. you are correct should be

g/Kwh x engine kw : density of fuel (0.85 for diesel)

one more "question".

can i install 100 US gallon tank in the 20 foot boat. ofcourse, i can. but should it be overkill. engine is FNM HPEP-150 sterndrive. what would be bigest tank that i normaly can install in boat this size. i would like to have as much range as posible.

i am in europe and would like to cruise med, croatia to greece, sicily, etc at least 300 miles range with 10% reserve fuel

thanks one more time.

(sorry for english, it is not my first language)

this is the boat...

Overall Length 20' 3"

Overall Beam 6' 10"

Last edited by lola rose; 07-27-2012 at 01:18 PM.
lola rose is offline  

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

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


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

Email Address:


Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
fuel consumption gas vs diesel jklewissf Gear & Maintenance 25 05-11-2013 07:28 PM
Fuel Consumption vega1860 General Discussion (sailing related) 17 12-25-2011 11:46 AM
Fuel consumption question tireman Gear & Maintenance 15 05-18-2011 12:18 PM
Fuel Consumption SimonV General Discussion (sailing related) 10 02-14-2007 12:28 PM
fuel consumption Darco1 Gear & Maintenance 1 04-12-2005 01:15 PM

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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