Thread Tools Search this Thread Display Modes
Old 10-15-2021, 05:17 PM   #1
Senior Member
City: Cairns
Join Date: Jul 2019
Posts: 427
Alternator Arms Race

Looking for some more charging capacity??

48v @ 400A. That's 20kW. 😳

Obviously those are Shenzen amps but an indication of the capacities available now.
Attached Thumbnails
GoneDiving is offline   Reply With Quote
Old 10-16-2021, 08:23 PM   #2
diver dave's Avatar
City: Palm Coast, FL
Vessel Name: Coquina
Vessel Model: Lagoon 380
Join Date: Jan 2017
Posts: 2,353
25HP from two V belts isnt exactly confidence building.
diver dave is offline   Reply With Quote
Old 10-16-2021, 09:21 PM   #3
Seevee's Avatar
City: st pete
Vessel Model: 430 Mainship
Join Date: Sep 2016
Posts: 3,314
I try to avoid most Chinese stuff, just hard to determine quality and just don't like them.
Seevee is offline   Reply With Quote
Old 10-16-2021, 10:46 PM   #4
Lepke's Avatar
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,667
So when something fails, where do you get parts.
Lepke is online now   Reply With Quote
Old 10-17-2021, 05:31 AM   #5
FF's Avatar
Join Date: Oct 2007
Posts: 22,553
A low cost rebuilt DN 50 would be my choice if I needed mucho amps.

Available with belt drive .

50DN Delco High Amperage Bus Alternator 24 Volt 270 Amp Gear Driven Oil Cooled


3 available

US $867.00
FF is offline   Reply With Quote
Old 10-24-2021, 11:19 AM   #6
City: San Francisco
Join Date: Apr 2018
Posts: 2,245
Not hard to 400A out of that setup. VERY hard to get 400 amps for more than a few minutes without melting it down. Alternators are usually 60-70% efficient. So if it is putting out 20KW, it is generating 13KW in heat internally. Where's it gonna go?

Even a reliable brand (I am using a Delco 28si) will seriously derate as soon as it warms up. My alternator is rated at 160A but will only do about 110 continuously and stay within temp specs. I do have an Electrodyne on the sailboat which will do a continuous 280A @ 24V, but it is a huge piece of gear with external diodes, two large fans, and is driven by a driveshaft.
DDW is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program

All times are GMT -5. The time now is 12:40 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012