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Alternator Upgrade 4JH80 |
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Nelson01 
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Joined: 18 September 2018 Location: Med...Italy now Status: Offline Points: 45 |
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 Topic: Alternator Upgrade 4JH80Posted: 04 March 2023 at 23:18 |
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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 ? Marc
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Marc
H508#11 UNEVIE |
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Alex75
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Joined: 10 February 2022 Location: France Status: Offline Points: 75 |
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Posted: 05 March 2023 at 07:43 |
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I am the subject, because I will be interested
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Alex75
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Joined: 10 February 2022 Location: France Status: Offline Points: 75 |
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Posted: 07 March 2023 at 19:09 |
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aucun retour ?
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jeb
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Joined: 05 May 2014 Location: Sweden Status: Offline Points: 214 |
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Posted: 08 March 2023 at 13:32 |
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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.
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Jesper
Hanse 400e |
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spam
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Joined: 22 February 2017 Location: Boston Status: Offline Points: 68 |
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Posted: 08 March 2023 at 14:30 |
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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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