Turn a car alternator into alternative energy by building this cheap and easy homemade wind generator.
By Robert D. Copeland
If you can turn a wrench and operate an electric drill, you can build this simple generator in two days. Photo by Robert D. Copeland
You can use any vehicle alternator with a built-in voltage regulator. Photo by Robert D. Copeland
The fan is attached to the alternator using a 3-inch washer. Photo by Robert D. Copeland
You can use 1/2-inch galvanized pipe to make the generator bracket. Photo by Robert D. Copeland
The 3-inch washer used to attach the fan and clutch assembly to the alternator. Photo by Robert D. Copeland
Here, you can see how the generator mounts into the bracket. Keep in mind that the exact bracket dimensions and the size of the bolts used will vary with different alternators. Photo by Robert D. Copeland
The completed generator is ready to hook up to a battery bank and provide renewable energy. Photo by Robert D. Copeland
Maybe you reside on a boat, vacation in a remote cabin, or live off-grid like me. Or perhaps you’re just interested in lowering your energy bill. Either way, with a handful of inexpensive and easy-to-source materials, you can build a homemade wind generator, making electricity yours for the taking for as long as the wind is blowing. You’ll be able to light up that storeroom, power your barn, or use a generator to keep all your vehicle batteries charged.
Electricity for my off-grid cabin comes from solar and wind power stored in a bank of four 6-volt golf cart batteries wired for a 12-volt system. A charge controller and battery minder keep my system from under- or overcharging. The whole shebang cost me less than $1,000, and I have lights, fans, a television and stereo, refrigeration, and a disco ball that goes up for special occasions.
If you can turn a wrench and operate an electric drill, you can build this simple generator in two days: one day for chasing down parts, and one day for assembling the components. The four major components include a vehicle alternator with a built-in voltage regulator, a General Motors (GM) fan and clutch assembly (I used one from a 1988 GM 350 motor), a tower or pole on which to mount the generator (15 feet of used 2-inch tubing cost me $20), and the metal to build a bracket for mounting the generator on the tower or pole. If you’re a Ford guy or a Mopar gal, that’s fine — just make sure your alternator has a built-in voltage regulator. You’ll also need some electrical cable or wires to hook the alternator up to your storage batteries. I used 8-gauge, 3-conductor cable pilfered from the oil patch. (And they said the transition from fossil fuels to renewables would take years. Pfft!)
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Fan Clutch to Alternator Attachment
The blades for the wind generator are repurposed from a vehicle fan clutch. To attach the blades to the alternator, you can weld the fan clutch hub directly to the alternator hub — just make certain the fan is perfectly in line with the alternator shaft. Also, make sure the alternator’s built-in wire plug-ins are located on what will be the bottom of the generator. If you don’t have access to a welder, you can connect the fan clutch to the alternator using the following materials:
• 5/8-inch-by-3-inch washer, 3/16 inch thick
• Electric drill
• 1/4-inch thread tap
• Drill bit that corresponds to specific thread tap
• (4) 1/4-inch-by-1-1/2-inch to 2-1/2-inch bolts with corresponding nuts and lock washers
Create a union using the 3-inch washer and the four bolts, which will fasten the fan clutch and alternator together. Drill four holes into the washer to match the holes in the fan clutch, and then cut threads in the holes using the 1/4-inch tap. Screw the bolts into the holes. To determine the length of the bolts you’ll need, stack the fan on top of the alternator with the fan pulley resting on the alternator pulley and both shafts in line. Measure the length along the two shafts from the back of the alternator fan to the back of the fan clutch hub. Use this length for the bolts. Unscrew the alternator pulley nut, and remove the pulley and small fan. Slide the union that you made from the washer and four bolts over the alternator shaft, with the bolts pointing away from the alternator. Then, reattach the alternator fan and nut onto the shaft, leaving the pulley off. The large nut will hold the union in place. Attach the fan clutch assembly to the bolts now protruding from the alternator, and tighten the nuts with lock washers in place.
Bracket Assembly for Mounting the Alternator
If you have a welder, making a bracket is simple. I used 1-inch square tubing for all the bracket pieces and a 2-foot-long piece of 1-inch pipe for the rotating stem that fits inside the pole. If you don’t have a welder, fear not. The bracket assembly can be put together with 1/2-inch galvanized pipe and fittings. Here’s a list of the pipe fittings you’ll most likely need:
A tail fin must be attached to the 12-inch nipple at the back of the bracket to spin the generator around and line it up with the wind’s direction. You can cut a fin that’s about 1 foot high and 2 feet long out of old tin siding or roofing with tin snips or a cutting torch — a right-angle-triangle shape works best. If you’re using corrugated metal, be sure to cut the fin so the corrugations run horizontally. After the fin is cut out, lay it on top of one of the 12-inch nipples and drill three pilot holes through the bottom of the tail fin and into the side of the nipple. Use three screws (steel roofing screws work well) to affix the tail to the nipple.
Wind Generator Tower
I used an old 20-foot-tall television antenna tower along with a 2-1/2-inch-diameter pipe for the top piece. You’ll also need to weld or bolt a stop at the top of the tower that will make contact with a stop on your bracket assembly. The stops will only allow the generator to turn 360 degrees clockwise or counterclockwise so your cable doesn’t get twisted around the pole and tower.
A joint of 2-3/8-inch heavy-gauge metal tubing anywhere from 10 feet to 20 feet in length (or height, once erected) makes for a good tower after it’s attached to a building or other sturdy, stationary structure. Make sure it’s secure, and consider using guy-wires if necessary.
After you have all the generator components fastened together and attached to your bracket assembly, mount it to your unerected pole or tower. Insert the pipe on the generator bracket assembly into the pole or the top of your tower. Use two steel washers stacked together to create a smooth surface to act as a bearing between the generator and tower. Attach the positive and negative wires to the alternator and secure them to the bracket and along the tower with zip ties, baling wire, or duct tape. (It isn’t really homemade unless it has a little baling wire and duct tape on it somewhere, now is it?) Make sure to leave enough slack in the wires for the wind generator to rotate 360 degrees.
You’ll likely need assistance standing the tower and generator upright as it will be pretty heavy. Ropes and a come-along will help if you’re going up fairly high. If it’s always windy in your location, you’ll only need to be high enough off the ground to keep the moving parts safely overhead. Securely fasten your tower in place. The wind can be deceptively strong, so don’t cut corners on this final assembly stage. After you’ve erected your wind generator, connect the wires to your battery bank with a charge controller in between to prevent under- or overcharging.
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Now, you’ll be ready to hit the lights, crank up the jams, and bust out those old disco moves I know you’ve been saving up for an electric slide with family and friends.
A quick disclaimer: build and use at your own risk. My generator works fine, but you’re responsible for your work. Good luck and power up!
Robert D. Copeland raises and sells grass-fed beef cattle and is the proprietor of a Texas-based off-grid bed-and-breakfast retreat called The Sunflower, complete with straw bale and earth plaster cabins, fresh organic meals, permaculture instruction, workshops, and more!
Power From the Wind is the completely revised and updated edition of the go-to guide for individuals and businesses interested in installing small wind energy systems. Written for the layperson, this practical guide provides an accurate and unbiased view of all aspects of small wind energy systems, including:
Wind and wind energy system options
Ways to assess wind resources at your site
Wind turbines and towers
Inverters and batteries
Installation and maintenance of systems
Costs and benefits of installing a wind system
Readers will gain the knowledge they need to make wise decisions during the design, purchase, and installation of small wind energy systems and to communicate effectively with wind system installers, and will be empowered to help make the smartest, most economical choices. Order from the Mother Earth News store or by calling 800-456-6018.
Originally Published: April/May 2017
Share your thoughts.
sean
1/25/2021 1:47:25 PM
Put a liter fan on it not the one shown use bamboo wood for the tail
Tex
11/16/2020 1:47:26 AM
Lsouth it doesn't take a genius to figure out how to wire an Alternator to a battery bank.
LSouth
11/4/2020 2:31:32 PM
It believe it would take a hurricane force wind to turn that type of fan blade. Even then, the tower would likely collapse long before any electrical power has been produced.
I'm in the process of building a hand crank operated, 12 volt battery charging system, using a series of small and large pulleys.
Tech support where I ordered the alternator from told me I needed to provide 600 rpm to excite (energize) the alternator.
Providing that I can crank 1 rotation every 2 seconds (30 rpm) stepping up to 4-1 ratio (120 rpm) with pulleys, and then again with 5-1 pulleys, I'm hoping to reach that 600 rpm mark.
With friction from the pulleys and belts, it is unlikely I could step up a 3rd time and be able to crank 30 rpm by hand. Wind power would require much less physical effort, but it's rarely ever windy where I live.
Anyways.... I call BS on this article.
He's just advertising his ranch and bed n breakfast through this scam.
If this is real you'd see the wiring diagrams and all but there are only pics? Even a 5 year old can create ads with just pics...pfft. What a scam.
Bamboo
8/23/2019 1:45:50 PM
I have 3 of these in Jamaica to power up a church and parsonage. I use heavy equipmentioned batteries there cause that's all you can get there. It's my most costly item I have but once they are powered up I get 2 morning services and 2 nightly services. We are not changing out everything to LED
Bamboo
8/23/2019 1:44:22 PM
I have 3 of these in Jamaica to power up a church and parsonage. I use heavy equipmentioned batteries there cause that's all you can get there. It's my most costly item I have but once they are powered up I get 2 morning services and 2 nightly services. We are not changing out everything to LED
Bamboo
8/23/2019 1:31:02 PM
I've got 3 of them working in Jamaica. Powering a big church 11,000SF and a parsonage. Lot of wind. I used deep cycle heavy equipment battries, all I can really get.
We use this because I can regulate a steady 120 volts, 60htz that the musical equipment need. Only Peavy can operate at 90 amps and 50 htz. Also, 60htz is what makes a saw either sing or bind up.
We are in process of changing out to LED. Even better now
Bamboo
8/23/2019 1:27:05 PM
I have 3 of these in Jamaica to power up a church and parsonage. I use heavy equipmentioned batteries there cause that's all you can get there. It's my most costly item I have but once they are powered up I get 2 morning services and 2 nightly services. We are not changing everything to LED
pmbourque
8/23/2019 8:23:12 AM
Oh my sweet goodnesses! That has to be be the quaintest and most adorable one I've seen made in current times! Good work!
How noisy is it?
RobertLewis39
5/15/2019 4:04:05 AM
I used to have big problem finding effective ways to build my wind power system and reduce my electric bill.But I am getting better result now, after I stumbled upon this excellent guide I found HERE ( easy-wind-power.hqtips.info ). It was a godsend. It gave me great wind power tips and showed me what I was doing wrong before.
owhgsparkie
4/1/2019 6:58:42 AM
Just wondering in regards to the low output from the alternator, if the blade rotor was connected to the alternator rotor via a large sprocket(blade rotor) and small sprocket(alternator rotor) surely that could multiply the output in accordance with sprocket ratios used?? Or would that increase resistance and restrict blades from spinning as freely??
KindPharm
7/27/2018 1:24:58 PM
I am totally new to all of this and would LOVE for those calling 'B.S.' to share something that is affordable and easy to create that would power a small irrigation pump or air pump to pump air between two sheets of poly on a high tunnel...
Thanks!
Joe
6/6/2018 6:05:35 PM
A regular alternator out of a car needs to be modified to produce anything meaningful above a few volts if any at low RPM. If this guy is not totally bullshit lieing, he is using a modified PMA alternator (permanent magnet alternator) and if not the voltage he is so proudly showing is actually a voltage drop caused by the alternator using power to power it's field coil. This is very misleading to newcomers to the field of renewable energy and makes a mockery of it. And if he really wanted to help people build this he would have should people how to wire the alternator up . Including explaining things like the wires on the regulator the ignition switch , the stator and the field wires. This is why rednecks laugh at liberals because they see shit like this. .
Joe
6/6/2018 6:05:00 PM
A regular alternator out of a car needs to be modified to produce anything meaningful above a few volts if any at low RPM. If this guy is not totally bullshit lieing, he is using a modified PMA alternator (permanent magnet alternator) and if not the voltage he is so proudly showing is actually a voltage drop caused by the alternator using power to power it's field coil. This is very misleading to newcomers to the field of renewable energy and makes a mockery of it. And if he really wanted to help people build this he would have should people how to wire the alternator up . Including explaining things like the wires on the regulator the ignition switch , the stator and the field wires. This is why rednecks laugh at liberals because they see shit like this. .
Joe
6/6/2018 6:04:59 PM
A regular alternator out of a car needs to be modified to produce anything meaningful above a few volts if any at low RPM. If this guy is not totally bullshit lieing, he is using a modified PMA alternator (permanent magnet alternator) and if not the voltage he is so proudly showing is actually a voltage drop caused by the alternator using power to power it's field coil. This is very misleading to newcomers to the field of renewable energy and makes a mockery of it. And if he really wanted to help people build this he would have should people how to wire the alternator up . Including explaining things like the wires on the regulator the ignition switch , the stator and the field wires. This is why rednecks laugh at liberals because they see shit like this. .
jon
5/18/2018 9:50:13 AM
Stop publishing this,. I have seen it at least three different times. Do you ever read the comments from the knowledgeable people that write comments. All things point to this being a scam. Please either investigate or delete
Jeffrey Vasby
5/18/2018 7:43:20 AM
Sounds great but l don't see how he can get enough rpms to provide steady current. Also with bulk comes drag and resistance. Great idea l just see too much inffenciecy.
IanT
2/26/2018 3:04:50 PM
The alternator needs to turn at a minimum of 700 revolutions per minute to make any voltage so I am calling BS to this.
recycler
2/24/2018 7:35:49 PM
Low wind speed is the problem with any wind generator-the available energy is much lower,not just linearly reduced.I agree with above that an efficient blade set is very important.If it is inefficient you would get a trickle charge at best.There are other little tweaks that might turn out to be advanced engineering to get them right.The support pole has to be high.It could be a solar collector that creates a heated updraft to power a horizontal vane.A simple flat vane could bend in a very low breeze,connected to a one-way could start the main shaft spinning and overcome starting friction and inertia.Etc.
Don
2/6/2018 5:49:06 PM
The viscous clutch is going to allow the fan to free-wheel unless you have hot air flowing over it to make the thermostat engage the clutch. The fan is designed to pull air thru the radiator, not to be turned by air flowing past it. It is, after all, a FAN not a wind turbine (notice the curve of the blades). There is no way the fan will spin fast enough in the wind to turn the alternator fast enough to generate any usable power unless it is sped up buy a gear or pulley set.
Dugg
12/21/2017 6:34:21 PM
Check a self sustaining RV for your answers .I just need a windmill. Pulleys is the answer for low wind. You have to change the set up . alternator on bottom and fan on top.
Dugg
12/21/2017 6:34:20 PM
I would change that . I would put pulleys in between the alternator and the blades so I could make power at low speeds. The key to having a converter that that works. I have an self sustaining RV so it has everything there. I just need the windmill to give enough power to live. Paulbusby854@gmail.com
larry
12/7/2017 6:40:23 PM
larsonlars: Regardless if the fan is using a clutch or is mounted solid the fan has to be reversed to operate efficiently. Other wise you are spitting in the wind.
andy
10/18/2017 1:14:18 AM
What charge controller and battery minder do u use?
agipson823
10/18/2017 1:14:17 AM
What charge controller and battery minder do u use?
woodyratcliff
7/30/2017 9:52:44 AM
Is the battery bank connected to the circuit breaker box? What are some options to get power from battery bank to appliances, or lights.
joebrown4109
7/9/2017 3:48:28 PM
Well in the first place , you're using a clutch fan so you're going to have to drill holes in that , and make it a solid fan. in the second place that thing pulls a lot of torque when it's actually generating power . so I do not understand how you're getting enough wind to actually spit it at a high enough rate to get it to charge your batteries . unless you live in a wind tunnel. You must have some solar panels to back it up. because an alternator has to spin pretty damn fast to generate enough juice to keep your batteries charged up. if you're pulling juice out of them constantly with a refrigerator or a TV and some lights. If you've ever put jumper cables out of vehicle, you can hear the motor pull down when it is actually charging. that's the alternator putting torque on the motor. and I don't see any bolts through your clutch fan, so I don't understand how it's even spinning the alternator..... some thoughts on that would be nice to hear from you. as I would like to build one but have always thought it to not really be feasible to use an alternator. one wire Chevy alternator is perfect if it will generate juice as slow speed.
joebrown4109
7/9/2017 3:48:25 PM
Well in the first place , you're using a clutch fan so you're going to have to drill holes in that , and make it a solid fan. in the second place that thing pulls a lot of torque when it's actually generating power . so I do not understand how you're getting enough wind to actually spit it at a high enough rate to get it to charge your batteries . unless you live in a wind tunnel. You must have some solar panels to back it up. because an alternator has to spin pretty damn fast to generate enough juice to keep your batteries charged up. if you're pulling juice out of them constantly with a refrigerator or a TV and some lights. If you've ever put jumper cables out of vehicle, you can hear the motor pull down when it is actually charging. that's the alternator putting torque on the motor. and I don't see any bolts through your clutch fan, so I don't understand how it's even spinning the alternator..... some thoughts on that would be nice to hear from you. as I would like to build one but have always thought it to not really be feasible to use an alternator. one wire Chevy alternator is perfect if it will generate juice as slow speed.
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Put a liter fan on it not the one shown use bamboo wood for the tail
Lsouth it doesn't take a genius to figure out how to wire an Alternator to a battery bank.
It believe it would take a hurricane force wind to turn that type of fan blade. Even then, the tower would likely collapse long before any electrical power has been produced. I'm in the process of building a hand crank operated, 12 volt battery charging system, using a series of small and large pulleys. Tech support where I ordered the alternator from told me I needed to provide 600 rpm to excite (energize) the alternator. Providing that I can crank 1 rotation every 2 seconds (30 rpm) stepping up to 4-1 ratio (120 rpm) with pulleys, and then again with 5-1 pulleys, I'm hoping to reach that 600 rpm mark. With friction from the pulleys and belts, it is unlikely I could step up a 3rd time and be able to crank 30 rpm by hand. Wind power would require much less physical effort, but it's rarely ever windy where I live. Anyways.... I call BS on this article.
He's just advertising his ranch and bed n breakfast through this scam. If this is real you'd see the wiring diagrams and all but there are only pics? Even a 5 year old can create ads with just pics...pfft. What a scam.
I have 3 of these in Jamaica to power up a church and parsonage. I use heavy equipmentioned batteries there cause that's all you can get there. It's my most costly item I have but once they are powered up I get 2 morning services and 2 nightly services. We are not changing out everything to LED
I have 3 of these in Jamaica to power up a church and parsonage. I use heavy equipmentioned batteries there cause that's all you can get there. It's my most costly item I have but once they are powered up I get 2 morning services and 2 nightly services. We are not changing out everything to LED
I've got 3 of them working in Jamaica. Powering a big church 11,000SF and a parsonage. Lot of wind. I used deep cycle heavy equipment battries, all I can really get. We use this because I can regulate a steady 120 volts, 60htz that the musical equipment need. Only Peavy can operate at 90 amps and 50 htz. Also, 60htz is what makes a saw either sing or bind up. We are in process of changing out to LED. Even better now
I have 3 of these in Jamaica to power up a church and parsonage. I use heavy equipmentioned batteries there cause that's all you can get there. It's my most costly item I have but once they are powered up I get 2 morning services and 2 nightly services. We are not changing everything to LED
Oh my sweet goodnesses! That has to be be the quaintest and most adorable one I've seen made in current times! Good work! How noisy is it?
I used to have big problem finding effective ways to build my wind power system and reduce my electric bill.But I am getting better result now, after I stumbled upon this excellent guide I found HERE ( easy-wind-power.hqtips.info ). It was a godsend. It gave me great wind power tips and showed me what I was doing wrong before.
Just wondering in regards to the low output from the alternator, if the blade rotor was connected to the alternator rotor via a large sprocket(blade rotor) and small sprocket(alternator rotor) surely that could multiply the output in accordance with sprocket ratios used?? Or would that increase resistance and restrict blades from spinning as freely??
I am totally new to all of this and would LOVE for those calling 'B.S.' to share something that is affordable and easy to create that would power a small irrigation pump or air pump to pump air between two sheets of poly on a high tunnel... Thanks!
A regular alternator out of a car needs to be modified to produce anything meaningful above a few volts if any at low RPM. If this guy is not totally bullshit lieing, he is using a modified PMA alternator (permanent magnet alternator) and if not the voltage he is so proudly showing is actually a voltage drop caused by the alternator using power to power it's field coil. This is very misleading to newcomers to the field of renewable energy and makes a mockery of it. And if he really wanted to help people build this he would have should people how to wire the alternator up . Including explaining things like the wires on the regulator the ignition switch , the stator and the field wires. This is why rednecks laugh at liberals because they see shit like this. .
A regular alternator out of a car needs to be modified to produce anything meaningful above a few volts if any at low RPM. If this guy is not totally bullshit lieing, he is using a modified PMA alternator (permanent magnet alternator) and if not the voltage he is so proudly showing is actually a voltage drop caused by the alternator using power to power it's field coil. This is very misleading to newcomers to the field of renewable energy and makes a mockery of it. And if he really wanted to help people build this he would have should people how to wire the alternator up . Including explaining things like the wires on the regulator the ignition switch , the stator and the field wires. This is why rednecks laugh at liberals because they see shit like this. .
A regular alternator out of a car needs to be modified to produce anything meaningful above a few volts if any at low RPM. If this guy is not totally bullshit lieing, he is using a modified PMA alternator (permanent magnet alternator) and if not the voltage he is so proudly showing is actually a voltage drop caused by the alternator using power to power it's field coil. This is very misleading to newcomers to the field of renewable energy and makes a mockery of it. And if he really wanted to help people build this he would have should people how to wire the alternator up . Including explaining things like the wires on the regulator the ignition switch , the stator and the field wires. This is why rednecks laugh at liberals because they see shit like this. .
Stop publishing this,. I have seen it at least three different times. Do you ever read the comments from the knowledgeable people that write comments. All things point to this being a scam. Please either investigate or delete
Sounds great but l don't see how he can get enough rpms to provide steady current. Also with bulk comes drag and resistance. Great idea l just see too much inffenciecy.
The alternator needs to turn at a minimum of 700 revolutions per minute to make any voltage so I am calling BS to this.
Low wind speed is the problem with any wind generator-the available energy is much lower,not just linearly reduced.I agree with above that an efficient blade set is very important.If it is inefficient you would get a trickle charge at best.There are other little tweaks that might turn out to be advanced engineering to get them right.The support pole has to be high.It could be a solar collector that creates a heated updraft to power a horizontal vane.A simple flat vane could bend in a very low breeze,connected to a one-way could start the main shaft spinning and overcome starting friction and inertia.Etc.
The viscous clutch is going to allow the fan to free-wheel unless you have hot air flowing over it to make the thermostat engage the clutch. The fan is designed to pull air thru the radiator, not to be turned by air flowing past it. It is, after all, a FAN not a wind turbine (notice the curve of the blades). There is no way the fan will spin fast enough in the wind to turn the alternator fast enough to generate any usable power unless it is sped up buy a gear or pulley set.
Check a self sustaining RV for your answers .I just need a windmill. Pulleys is the answer for low wind. You have to change the set up . alternator on bottom and fan on top.
I would change that . I would put pulleys in between the alternator and the blades so I could make power at low speeds. The key to having a converter that that works. I have an self sustaining RV so it has everything there. I just need the windmill to give enough power to live. Paulbusby854@gmail.com
larsonlars: Regardless if the fan is using a clutch or is mounted solid the fan has to be reversed to operate efficiently. Other wise you are spitting in the wind.
What charge controller and battery minder do u use?
What charge controller and battery minder do u use?
Is the battery bank connected to the circuit breaker box? What are some options to get power from battery bank to appliances, or lights.
Well in the first place , you're using a clutch fan so you're going to have to drill holes in that , and make it a solid fan. in the second place that thing pulls a lot of torque when it's actually generating power . so I do not understand how you're getting enough wind to actually spit it at a high enough rate to get it to charge your batteries . unless you live in a wind tunnel. You must have some solar panels to back it up. because an alternator has to spin pretty damn fast to generate enough juice to keep your batteries charged up. if you're pulling juice out of them constantly with a refrigerator or a TV and some lights. If you've ever put jumper cables out of vehicle, you can hear the motor pull down when it is actually charging. that's the alternator putting torque on the motor. and I don't see any bolts through your clutch fan, so I don't understand how it's even spinning the alternator..... some thoughts on that would be nice to hear from you. as I would like to build one but have always thought it to not really be feasible to use an alternator. one wire Chevy alternator is perfect if it will generate juice as slow speed.
Well in the first place , you're using a clutch fan so you're going to have to drill holes in that , and make it a solid fan. in the second place that thing pulls a lot of torque when it's actually generating power . so I do not understand how you're getting enough wind to actually spit it at a high enough rate to get it to charge your batteries . unless you live in a wind tunnel. You must have some solar panels to back it up. because an alternator has to spin pretty damn fast to generate enough juice to keep your batteries charged up. if you're pulling juice out of them constantly with a refrigerator or a TV and some lights. If you've ever put jumper cables out of vehicle, you can hear the motor pull down when it is actually charging. that's the alternator putting torque on the motor. and I don't see any bolts through your clutch fan, so I don't understand how it's even spinning the alternator..... some thoughts on that would be nice to hear from you. as I would like to build one but have always thought it to not really be feasible to use an alternator. one wire Chevy alternator is perfect if it will generate juice as slow speed.