Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 03-06-2023, 08:39   #1
Registered User
 
unbusted67's Avatar

Join Date: Dec 2006
Boat: Looking for a new boat
Posts: 2,539
Images: 24
Understanding gendsets as they pertain to hybrid propulsion.

Sorry “gensets” and I’m not saying I’m doing this but I am researching hybrid propulsion and find myself a bit confused regarding generator/batt bank sizing for a 24kw electrical DC motor.

Assuming no solar or regen how would I calculate bank size and more importantly generator size?
__________________
__________________________________________
Unbusted67 or just Ben
unbusted67 is offline   Reply With Quote
Old 03-06-2023, 09:27   #2
Registered User

Join Date: Jan 2023
Posts: 912
Re: Understanding gendsets as they pertain to hybrid propulsion.

Once you know what the electrical demand of your engine is a cruising speed, and how far you want to go on battery only power, that tells you how big your battery bank needs to be. If you want to the generator to supply enough power to run the boat at cruising speed, you need a generator big enough to power the motor, plus enough to add some to the batteries, plus enough for house loads.

In terms of gross fuel usage, capital cost, and maintenance cost, it is hard to design such a system that is more efficient than a properly sized straight diesel power plant.
SailingHarmonie is offline   Reply With Quote
Old 04-06-2023, 14:46   #3
Registered User
 
unbusted67's Avatar

Join Date: Dec 2006
Boat: Looking for a new boat
Posts: 2,539
Images: 24
Re: Understanding gendsets as they pertain to hybrid propulsion.

Let’s say I’ve got a 24kv motor and am looking at a 400ah bank at 96volts (2 banks of 8 series/parallel) that’s 400x96=38000kwh so I could run the motor at WOT for 1.5 hrs. I’d need an absolutely massive generator to both run the engine and charge house bank and propel the boat. Something in the order of 50kw, which you’d be hard pressed to fit in and engine room. Does this sound right?
__________________
__________________________________________
Unbusted67 or just Ben
unbusted67 is offline   Reply With Quote
Old 04-06-2023, 14:55   #4
Registered User
 
unbusted67's Avatar

Join Date: Dec 2006
Boat: Looking for a new boat
Posts: 2,539
Images: 24
Re: Understanding gendsets as they pertain to hybrid propulsion.

I just did days of research when I could have just watched a 7 minute YouTube video. �� https://youtu.be/ktLksMWVb0s
__________________
__________________________________________
Unbusted67 or just Ben
unbusted67 is offline   Reply With Quote
Old 04-06-2023, 15:03   #5
Registered User

Join Date: Jul 2020
Location: Virginia, USA
Boat: Tayana 37
Posts: 960
Re: Understanding gendsets as they pertain to hybrid propulsion.

Quote:
Originally Posted by unbusted67 View Post
Letís say Iíve got a 24kv motor and am looking at a 400ah bank at 96volts (2 banks of 8 series/parallel) thatís 400x96=38000kwh so I could run the motor at WOT for 1.5 hrs. Iíd need an absolutely massive generator to both run the engine and charge house bank and propel the boat. Something in the order of 50kw, which youíd be hard pressed to fit in and engine room. Does this sound right?
If you are going to use a generator large enough to power the full output of the electric motor 24/7 there is no point just have the engine turn the propshaft.

The idea of a hybrid propulsion is you mostly use the electric motor for populsion and the generator backfills some of the required power and also recharges the batteries as needed.

A 24 kW electric motor coupled to a 24 kW diesel generator/engine is pointless. Have the 24 kW engine just turn the propshaft.
Statistical is offline   Reply With Quote
Reply

Tags
propulsion

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mechanical possibility of hybrid propulsion conversion Shlomi Engines and Propulsion Systems 6 31-10-2022 18:52
Electrical Propulsion vs Diesel Propulsion niel12 Multihull Sailboats 232 14-11-2014 16:51
parallel hybrid for propulsion Allio Engines and Propulsion Systems 30 15-07-2013 02:14
Hybrid Propulsion - I Just Don't Get it twistedtree Engines and Propulsion Systems 38 19-06-2013 12:33
They never got over Herreschoff did they? 44'cruisingcat Multihull Sailboats 7 13-11-2007 18:56

Advertise Here


All times are GMT -7. The time now is 22:03.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.