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Topic: 24SI Alternator check (Read 2712 times) previous topic - next topic

Re: 24SI Alternator check

Reply #50 –
Quote from: dlkj07 –
Just curious, why does the 28SI have to use the ignition hot wire to work correctly?

As Chuck said, the Delco 28SI (40SI, 55SI) need to have 12V on the B+ terminal either continuously or at startup using an isolator with the ignition terminal. The internal smart (digital) regulator needs this to boot up and be ready to regulate using the S sense voltage. Once the engine is running the "kick start" from the ignition wire is no longer needed, until the next time you start the engine. So, using the stock isolator will not work, you will get erratic or no output.
Peter and Tammy Fleming
1991 U300 GV 40 - Sold, owned for 4 years
Downsized to Roadtrek Popular 210 class B

Re: 24SI Alternator check

Reply #51 –

So if I'm going to spend around $200 or so for the isolator with the ignition lug but in the future going to upgrade to the Victron Orion XS DC-DC charger,($315 on amazon) I may as well get the Victron now because it will work with my current setup.

Then when I do upgrade to Lithium Ion batteries I should be good to go.

Amazon.com: Victron Energy Orion XS Smart DC to DC Battery Charger 12/12 50A...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Dylan and Aimee
2001 U320 4013
Unit# 5896
450 HP/IFS
 

Re: 24SI Alternator check

Reply #52 –
Here is the Delco Tech Bulletin on using an isolator.

Note - the initial image is the thumbnail, click again to see the high res document.

The selected media item is not currently available.
Peter and Tammy Fleming
1991 U300 GV 40 - Sold, owned for 4 years
Downsized to Roadtrek Popular 210 class B

Re: 24SI Alternator check

Reply #53 –
Quote from: prfleming –
Here is the Delco Tech Bulletin on using an isolator.

Note - the initial image is the thumbnail, click again to see the high res document.

The selected media item is not currently available.
Well that explains it well, thanks.
Dylan and Aimee
2001 U320 4013
Unit# 5896
450 HP/IFS
 

Re: 24SI Alternator check

Reply #54 –

Quick search for isolators with excite option

Amazon.com: Victron Energy Argofet Battery Isolators 200-2AC (2 Batteries...

Amazon.com: Quick Cable 303306-001 Battery Isolator : Automotive

Amazon.com: Cole Hersee 48162 Battery Isolator : Automotive

https://www.waytekwire.com/product/eaton-s-sure-power-24023a-ib-multi-battery

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Peter and Tammy Fleming
1991 U300 GV 40 - Sold, owned for 4 years
Downsized to Roadtrek Popular 210 class B

Re: 24SI Alternator check

Reply #55 –
Quote from: prfleming –
Quick search for isolators with excite option

Amazon.com: Victron Energy Argofet Battery Isolators 200-2AC (2 Batteries...

Amazon.com: Quick Cable 303306-001 Battery Isolator : Automotive

https://www.waytekwire.com/product/eaton-s-sure-power-24023a-ib-multi-battery
Thanks, but I do think I talked my self into the DC/DC charger instead.
As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
Dylan and Aimee
2001 U320 4013
Unit# 5896
450 HP/IFS
 

Re: 24SI Alternator check

Reply #56 –
Quote from: dlkj07 –
Thanks, but I do think I talked my self into the DC/DC charger instead.

Yes, awesome. My only comment is with 1 of those you are only using a fraction of the available alternator output to recharge batteries while driving. Some other members have added multiple B2Bs with good results.
Peter and Tammy Fleming
1991 U300 GV 40 - Sold, owned for 4 years
Downsized to Roadtrek Popular 210 class B

Re: 24SI Alternator check

Reply #57 –
Quote from: prfleming –
Yes, awesome. My only comment is with 1 of those you are only using a fraction of the available alternator output to recharge batteries while driving. Some other members have added multiple B2Bs with good results.
In my situation I think I'm good with one...I have solar too which pumps in more juice if needed. Not often will I need to rely just on an alternator to get my batteries charged...unless I'm missing something.
Dylan and Aimee
2001 U320 4013
Unit# 5896
450 HP/IFS
 

Re: 24SI Alternator check

Reply #58 –
Nighttime and cloudy days come to mind.
1995 U320C SE 40'
Jeep 4x4 Commander - Limited - Hemi
"The Pack"  Yogi and Diesel our Airedales -  Charlie our Boxer/Akita mix. Gone but NEVER forgotten Jake our yellow Lab.
NRA Law Enforcement Firearms instructor - Handgun/shotgun
Regional Firearms instructor for national Armored Transp. Co.

Re: 24SI Alternator check

Reply #59 –
Peter. Could you turn the boost switch on while driving to get more power to the house batteries, while driving? I have lithium house batteries and a Orion dc/dc charger. I don't currently turn on my boost switch while driving. But have considered it.
Tom
Tom and Michelle 2004 U270 36WTFS

Re: 24SI Alternator check

Reply #60 –
I ditched the diode isolator for a Yandina combiner (relay based) years ago. I think Yandina has been bought out, but other companies make a similar unit.
1998 U270 34'

Re: 24SI Alternator check

Reply #61 –
Quote from: T and M Long –
Peter. Could you turn the boost switch on while driving to get more power to the house batteries, while driving? I have lithium house batteries and a Orion dc/dc charger. I don't currently turn on my boost switch while driving. But have considered it.
Tom
Can you combine batteries with the boost switch while driving - yes. But, lithiums will accept a very large charge current up to being fully charged. You would run the risk of seriously overloading the alternator. That is why people go to a B2B (or multiple B2Bs in parallel) with lithiums, so the alternator load is controlled to protect the alternator.
Peter and Tammy Fleming
1991 U300 GV 40 - Sold, owned for 4 years
Downsized to Roadtrek Popular 210 class B

Re: 24SI Alternator check

Reply #62 –
Thanks for the answer. That's what I thought, but wanted your thoughts.
Tom
Tom and Michelle 2004 U270 36WTFS