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Old 06-08-2018, 04:55 PM   #1
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2 Alternators CAT 3126

Has anyone added a second alternator to their CAT 3126? I have been trying to avoid it and go with a 12v solar system, but it seems like all the solar stuff will work better with a 24v system and therefore I need to add another alternator. Info on doing so would be highly appreciated!
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Old 06-08-2018, 07:53 PM   #2
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If you are already doing solar why not use a voltage step down? They are less money than adding an alternator. I guess I don't know what you need extra 12v for
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Old 06-08-2018, 09:36 PM   #3
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Our panels will not be exposed when driving. We were planning on using the alternator to charge the system while on the road. So, would I need a step up? Alternator > step up > batteries


I have no clue what I am doing with solar and it has been somewhat difficult to know what we need. I am looking for someone to take over and tell me EXACTLY what we need.



Thanks for the response!
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Old 06-08-2018, 10:53 PM   #4
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https://www.solar-electric.com/ Great site to educate yourself about solar, options and figuring out what you need.
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Old 06-08-2018, 10:57 PM   #5
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Originally Posted by Rivetboy View Post
https://www.solar-electric.com/ Great site to educate yourself about solar, options and figuring out what you need.

Yes, I have read over that site, and many others. Not everyone can read a book and know how to do something. Try to rebuild an engine by reading, it doesn't work. Take it apart, screw it up, take it apart again, and rebuild it. I'm very much hands on, but without having the items I need I can't be hands on. I'm about to finish a BS of environmental science and we've barely touched any rocks or been in the field.
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Old 06-08-2018, 11:16 PM   #6
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Victron makes a charger that will charge your 24 volt battery from a 12 volt source.

The 20 Amp version costs about $150
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Old 06-08-2018, 11:17 PM   #7
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We had planned to wire for 50 amp service.
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Old 06-09-2018, 12:03 AM   #8
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Learn how to do an energy audit.you can practice at home. All you need is pencil and paper. This is the basic first step to designing any solar system be it rv or marine.
Learn the terminology.
Watch you tube.
Good luck
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Old 06-09-2018, 12:28 AM   #9
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Quote:
Originally Posted by Sasquatters View Post
Our panels will not be exposed when driving. We were planning on using the alternator to charge the system while on the road. So, would I need a step up? Alternator > step up > batteries


I have no clue what I am doing with solar and it has been somewhat difficult to know what we need. I am looking for someone to take over and tell me EXACTLY what we need.



Thanks for the response!
I'm not sure on that, I would to be safe.
I believe you can feed lower voltage in but it's way less efficient

How many amp hours of batteries are you planning?

What's the output of your current alternator?

What is the percentage of time you would have the panels covered while driving?

I would think you'd be better off with a generator or letting your bank charge before leaving
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Old 06-09-2018, 05:57 AM   #10
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if you are going to install a second alternator and your battery bank input is isolated from the bus electrical system then install a 24V alternator rather than do step-ups..

-Christopher
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