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Alternator Upgrade 4JH80

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Category: Hints & Tips
Forum Name: 505/508
Forum Description: 505/508 Hints, Tips and News
Printed Date: 01 October 2023 at 06:24
Software Version: Web Wiz Forums 12.06 -

Topic: Alternator Upgrade 4JH80
Posted By: Nelson01
Subject: Alternator Upgrade 4JH80
Date Posted: 04 March 2023 at 23:18
Hi to all

On our 508,we have a 12V/125 Amp alternator with a 4JH80 Yanmar engine.

Looking to upgrade alternator to 180-210 Amps.Has anyone upgraded their alternator and if so what did you use as alternator ?



H508#11 UNEVIE

Posted By: Alex75
Date Posted: 05 March 2023 at 07:43
I am the subject, because I will be interested

Posted By: Alex75
Date Posted: 07 March 2023 at 19:09
aucun retour ?

Posted By: jeb
Date Posted: 08 March 2023 at 13:32
How much do you get out of your original 125A Alternator (in fact it's a 120A Valeo, not 125)?
I have upgraded my 3JH4 engine from original 80A HItachi to a 125A Hitachi clone (very similar to the Valeo) including upgrading to the 6PK belt as you have on your engine. I optimized the alternator pulley to get a 1:2,4 ratio. Also added external fan cooling and can now charge with 120-125A net (Alternator giving 130-135A) continuous. Maybee external fan cooling will give you enough. 

Hanse 400e

Posted By: spam
Date Posted: 08 March 2023 at 14:30
How did you set up the external fan?   Do you have a picture?  When you say that you get 120A continuously, is that with lithium batteries?   My experience is that the AGM's internal resistance quickly limit the charging current  

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