Electronics > Projects, Designs, and Technical Stuff
current limiting 12v charging circuit
(1/3) > >>
tatersalad:
Im stumped and so are my buddies at work. Im trying to charge 3600ah worth of batteries on a motor home. I have it set up with dual 180 amp alternators and a few inverters to run the ac units. I would like to limit how much amperage the batteries can draw so if they are low they wont over load the alternators and burn up the windings. any ideas? thoughts? Basically a dc to dc battery charger rated for 200 amps. Ive found a 40 amp dc to dc but its 400 and it would take a week to charge it back up. I have a generator but id rather not use it. thanks in advance for any and all advice.
mvs:

--- Quote from: tatersalad on January 29, 2019, 03:21:32 am ---I would like to limit how much amperage the batteries can draw so if they are low they wont over load the alternators and burn up the windings. any ideas? thoughts? Basically a dc to dc battery charger rated for 200 amps.

--- End quote ---
Alternator should be controlled through its field winding. There is no point in creating external dc-dc charger, because of the complexity, costs and worser efficiency.
soldar:

--- Quote from: tatersalad on January 29, 2019, 03:21:32 am --- I would like to limit how much amperage the batteries can draw so if they are low they wont over load the alternators and burn up the windings. any ideas? thoughts?
--- End quote ---
You are making this too complicated when it is quite simple. Forget about the batteries. You want to limit the alternator output to a safe limit. That is all. And there is a good chance the alternator already has this internally built in. You should find out what alternator you have and what kind of control/regulator it has.
tatersalad:
they are 22si alternators, the gentleman who built them says they are good for 250amps each but if they are run at a constant full load it will burn the regulator and diodes up he recommended 150 to 175 each and they will last for ever. I don't want to over complicate it but I also don't want 500 dollars of alternators ruined and a tow bill of 750. someone mentioned controlling charge voltage and that would also regulate the charge current so I might go that route. still open to ideas
soldar:

--- Quote from: mvs on January 29, 2019, 09:19:07 am --- Alternator should be controlled through its field winding. There is no point in creating external dc-dc charger, because of the complexity, costs and worser efficiency.
--- End quote ---
That is the simple and correct answer.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod