schickmann: What did you use to create tension on the belt to keep belt tight? I can
see the bracket on the lower lobe of alternator...but what is the adjustor
on the upper lobe attached to?
Life is illusion: Could you please tell me what is the difference between the size of magnets
in 100amp alternators and 60amps alternators? Do 100amp ones have
bigger/stronger magnets or just thicker and longer wires are used for
goodcat1982: homebuilt? lol please. All you've done is connected 2 pulleys from and
engine and a PMA
NathansBackwoods: Why is it geared down, to get more current you want to put an over drive
from the engine to the alternator.
bigchad007: Couldn't you get an Alternator with a regulator built in?
mipmipmipmipmip: IT IS NOT VERY QUIET!!!
Szh Zoni: @dougaustintx if i want to move alternater with a 3000 rpm motor , so which
motor will u suggest me,, and if i attach a gearbox then ?? please reply me,
darion gordon: U did not make that
AlternativePowerMan: Also, when working with these little engines, don't exceed the ratio number
of 500. 1 HP can power 500 watts of electrical power. A lot of the retail
generators seem to use this number. It seems to be a good rule of thumb.
callmeshane303: Nice set up - bit too springy and flexible for my liking - the parts have a
tendency to fatigue, crack and break. I myself would be inclined to spin
the alternator at it's maximum RPM, at the motors maximum RPM and set up
gearing to that effect. I'd also fit in a lever with a spring to release
belt tension when starting and to allow the belt and pulley system to act
as the infrequently used clutch.
bartybollocks: Nice build, I am about to build something similar, had you considered using
a centrifugal clutch?
Dino Pasic: use hho as power for generator, i think it can also work on hho only, but
if it is used as second fuel source it is good also
Kargaroc286: it would be better to have an external regulator, so if anything fails, you
don't have to replace the entire thing
Rayxl1: Mine's going OK now I've given it a 2 to 1 reduction from engine to
bodybuildingking: A battery charges more efficiently SLOWLY then it does quickly. This rule
applies for every kind of battery out there.
MrLagros: Nice video! Thanks for sharing. I just built a homemade battery charger my
self. I think I'm using the same engine. Check out my video for my battery
charger and other solar/wind projects.
OBXSOLWIND: Nice well done!
bowtau9: Sorry i meant over 20 + amps , Can you regulate the charge to the batteries
with this type of set up , without the gm type alt ? Nice set up .....
bowtau9: Is that 21 v i see ? Wow.
dougaustintx: Well Nathan, as you can see , with the engine only running at 2150 rpm it
was still putting out 40 amps and the battery was already fully charged, so
it really could have used an even larger pulley on the alternator to slow
down the charge rate.
dougaustintx: I bought the permanent magnet alternator on Ebay. Search terms: " MAX AMP
PMA Permanent Magnet Alternator Generator QC12F " I don't currenty use this
PMA to charge batteries as it was putting too high voltage into the
batteries, even running the engine at its slowest setting and putting a 7"
pulley on the alternator in an effort to reduce RPM's and voltage. I
removed the PMA and installed a standard high amp GM alternator with a
built-in regulator to control the voltage.
Jay Roy: nice idea :)
TheWindMillMan: love the rev counter were did you get it great kit I love back yard
engineering and tinkering love the video thanks for sharing it with us andy
aaronanalog: Use an old Moped motor for better results. 2stroke 12,000 rpm and you can
gear it how ever you need to. + it uses less fuel.
dougaustintx: @bigchad007 Actually, I don't think there are any PMA's with internal
regulators, at least there weren't when I put this system together. The
typical automobile alternator regulates output by reducing the voltage to
the rotor, which reduces the magnetism acting on the field coils. In a PMA,
the magnets on the rotor are always on and working at maximum.
dougaustintx: @zoni3 I don't know what kind of alternator you are planning to use, but I
can tell you that most alternators will take a lot of horsepower once the
load is applied. I would not go with less than a 6 hp engine. If you live
near a Harbor Freight store or can mailorder one, they put their 6 hp
engines on sale for about $90 fairly often. Run the engine as slowly as you
can to conserve gas. I would not run a gearbox due to the complexity and
lack of long-term reliability.
doctorh2005: Is this really running by itself? Is it possible to connect to a Fiat Punto
car??? Please get back to me!! Thanks!
BlanchProductions: put a smaller pulley on the alternator, that will give it some boost
dougaustintx: @Redneckology Hehe... yeah it is. You have a sharp eye. I was trying to
keep the base as light as possible, and the "recycled" road sign has some
good back bracing built into the extrusion.
AlternativePowerMan: Hey good work keep it up. Personally I am not a fan of PMA. Typical
automotive alternators use electronic regulation which works really nice in
these little air-cooled engine setups. With PMA you gotta put more effort
into sizing the pulleys, watching the engine RPM, connecting the alternator
after you start the engine. Still, nice setup. What were you using for
rts: Wow, some commenters have no clue about under/overdrive pulleys. The 12,000
RPM moped motor suggestion was funny though. Just apply the same principles
of an auto transmission shifting from low to high gear (overdrive) and
you'll understand. Maximum output at the lowest engine speed possible is
the goal. No point in constantly over buzzing the engine unnecessarily for
sustained periods, not to mention, it burns more fuel and engine longevity.
NathansBackwoods: well it makes more sense to me to make it charge as fast as you can, might
as well get full use out of what you have, just my opinion.
dougaustintx: It was almost 40 amps going into a battery that was already fully charged!
The problem I had was the PMA was putting out about 17 volts with no way to
regulate it other than making the engine run much slower, or adding a whole
bank of batteries to create a bigger load. Thanks for looking.
Håkan Andersson: ive got one of my one i bilt it my self and i have a 100 A alternator and
it works great i have not put up pictures or films on it on the web
dougaustintx: If I were still using the permanent magnet alternator, I might consider a
clutch to eliminate the cogging effect at startup. I switched to a regular
high capacity car alternator early on. With the car alternator
(non-permanent magnet) I have a way to regulate the charge going to the
battery. I still feel like an over-center type of lever engagement would be
better and more reliable than a centrifugal clutch.
jacktheripped: @wiredforstereo that's why you can get 85 horse power from a 250cc Rotax ;)
gaspowerrules: @dougaustintx r theese motors reliable the 6.5 from harbor freight
NiteStar131: Fantastic work, you have a great set-up and are indeed a lucky person indeed
simonspaz: It's always best to run it on part throttle, not so much tickover/idle. At
idle the piston rings don't have enough compression to make a full seal and
eventually this leads to glazing of the bore and that in itself gives poor
compression and will mean lower output. I used to get this on old police
cars when they had excessive idling. The only option was the re-hone the
cylinders and put in new piston rings.
Juston Townson: I have a harbor freight engine as well with a Omar from windblue and use
this to charge a large bat. Bank. When batteries are at 60 percent I don't
need to worry about over voltage, but yet I am putting in the amps needed
to charge the batteries. This engine as run my camper for weeks without
shutting it off! I have an external tank that will go a week with it just
above idle! I love this stuff. LOL. Nice work.
Brian Pena: lol i have that same mother for my go kart (from habor fraght)
tom rushmore: ive got a pma from windbluepower and use it as a bike generator spinning it
with a bike and a belt and found the belt has to be tight which mine isnt
that tight but yea can light lightbulbs and charge small batterys within
time its just a fun project to learn about electricity
dougaustintx: @TheWindMillMan In case I didn't answer this for you before, I got the
little Tiny Tach at a local lawnmower/outdoor equipment place. They usually
have 2 or 3 different styles, but they are a bit pricey (around $35). I
think Briggs & Stratton makes one that is cheaper. I was kind of hoping
Harbor Freight would carry some small electronic tachs for about $8, but
that hasn't happened yet.
Ty Matthews: You don't think putting 50 amps into a dead battery will destroy it?
Batteries are not like gas tanks or water balloons... it's not a matter of
"filling up" as quickly as possible. It's a chemical oxidation/reduction
process with fundamental physical limits as to how fast they can be
charged. Over doing it, which you clearly are attempting to do, will likely
cause it to overheat dramatically. This in turn will almost assuredly
result in a nasty explosion, sending acid everywhere.
dougaustintx: The idea is to have STORED energy for use when you need it. It's kind of
hard to store AC, but batteries do just fine with DC.