9hp OHV engine and Permanent Magnet Alternator

My new set up for charging a bank of 12 v batteries tied in series. I'm using a 9 hp OHV engine that has a 2 1/2 inch pulley and a 7 inch pulley on the PMA, I designed it so I can loosen the V belt which allows me to start the engine and then ease in the alternator, this is a must for charging a bank of batteries. There are a few you tube videos that show a lawnmower engine hooked up to a PMA, that's what I used to have but found it to be almost impossible to start the engine with the V belt tight, just way too much current and resistance, plus it's noisy and just plain ugly on the environment, this set up is by far better, the OHV engine is the way to go. I built the frame out of square tubing and mounted the motor on rubber mounts. I am getting 30 to 35 open volts at turtle speed, 40 volts full throttle. I can achieve more volts by reducing the size of pulley on the PMA if needed. I also have solar and wind to help charge my batteries but after running a week or so on the batteries this help charge the batteries, I really hate to use the engine but it's way better than running a generator.

Category:

Science & Technology

Tags:

• MVI
• 0237

[luca20yo]

im new to this who process. i thought the pma kept going if cranked . then why need a moter to move the pma?

[stuckinwawa]

@luca20yo the pma needs to turn to send energy to the batteries, most people use the pma hooked up to a wind mill, I made this set up to charge my bank of batteries at my camp, sometime I don't see wind for weeks and I need to charge my batteries, this setup charges my batteries way faster than using a battery charger hooked up to a generator.

[mpmrla]

Nice professionsl looking setup. I made something similar to safely rechargre my marine battery since standard chargers are so unregulated they just damage good batteries. I used a 1hp ac motor and a regulated 45 amp vehicle alternator i purchased used for $5. After the motor is up to speed i excite the field coil for 1 second with a push button switch from the battery being charged and off she goes with regulated 14.7vdc

[intheshitter]

Why is the alternator putting out so much voltage? Shouldn't it be around 14v? Interesting setup.

[AlternativePowerMan]

Any chance we could see a load test video? Can it power some good load? The engine should be able to do up to 4500 watts. Nice setup. Check out my homemade generator.

[luca20yo]

@stuckinwawa im trying to make some magnets to charge one first i got to get the magnets working then ill be trying it was well.

[Phantasmansghost409]

@stuckinwawa Hello: I think you could get around the problem of having to tighten the belt. I would think to use remote stater relay to engage your charging system after the the engine is started. You could use a two stage set up so the batts can top charge then deep charge on the second. I have worked with electronics and automotive equip so have good resorces of info.

[1REDDAWN13]

@goose2goose2 ....sorry you didn't get the sarcasm.....it was weak but there. My thought was if you have all the parts, batteries and the time; sure make the home made gen. Add up all the parts price, how much more to get a brand new gen.

[goose2goose2]

@1REDDAWN13 you need to study more about alts and gens....big difference!

[goose2goose2]

but how many amps? volts don't mean much...how much current?