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Small *diesel* generators
|
|
| zxcvbob 2007-06-08, 8:25 pm |
| Reposting this here. Thanks.
Bob
-------- Original Message --------
Subject: Small *diesel* generators
Date: Fri, 08 Jun 2007 17:47:48 -0500
From: zxcvbob <zxcvbob@charter.net>
Newsgroups: alt.home.repair
I was tempted to buy a Honda 2000 watt electronic generator at the state
fair last year because they were on special for $899. (that's a great
price) I decided not to get one because (1) I hate spending $900+ and
(2) the electric power here is very reliable.
But I'm still interested in emergency generators even if I may never get
one.
Does anyone have experience with 2kw to 5kw diesel generators? Yanmar
makes them -- very expensive and hard to find -- and there are Chinese
knockoffs for less than $1000. (If you search on "Yanmar diesel
generator" you will probably find more links for the Chinese generators
that just have the word "Yanmar" in the page somewhere.)
They run at 3600 RPM rather than the 1800 I expected. So is there any
real advantage over gasoline? How long do 3600 RPM diesel engines last?
Gasoline engines are sometimes only rated for a few hundred hours. The
online specs never give this rating. I guess it's safer to store 100
gallons of diesel fuel during the blizzard (or hurricane, or whatever)
season than it is 150 gallons of gasoline.
Bob
| |
| (PeteCresswell) 2007-06-08, 8:25 pm |
| Per zxcvbob:
> I guess it's safer to store 100
>gallons of diesel fuel during the blizzard (or hurricane, or whatever)
>season than it is 150 gallons of gasoline.
I went the Honda EU2000 route last year.
Same as you - pretty reliable electric around here.
Do you have natural gas where you live?
I'm short on actual experience, but it sounds to me like a nat
gas fired generator gets around most of the care and feeding
issues that we have with gasoline machines.
Besides storing gas and draining the carb/tank between uses,
another issue that I hear coming up over and over again is
consumption. "Feeding the beast" in one person's words.
When the electric's out odds are that gasoline is harder to
obtain and the more capacity the gennie has, the faster it drinks
the stuff. Score one more point for natural gas...
My vehicle has a beeeeeeg gas tank (41 gallons) and if I try to
keep it at least half full I'm hoping that will take care of much
of the storage issue unless there's a *really* long outage.
The rest of my fuel storage consists of a couple of six-gallon
containers in the garden shed which I keep rotating through the
lawnmower.
Finally, think about how you're going to get that alternative
electric power into the house. Right now I'm depending on a few
very robust extension cords (as in #9 wire...).
In retrospect, I think the first thing I'd invest in is a proper
cutover box: something that would accommodate just an EU2000
(i.e. no 220) or a larger generator.
The extension cord solution doesn't sound too bad when the power
goes out bco a summer thunderstorm.... but I'm thinking that an
ice storm in the middle of the night in the winter may make me
wish I'd gotten a cutover switch.
--
PeteCresswell
| |
| Ulysses 2007-06-09, 1:25 pm |
|
"zxcvbob" <zxcvbob@charter.net> wrote in message
news:5cu7atF324obhU1@mid.individual.net...
> Reposting this here. Thanks.
>
> Bob
>
> -------- Original Message --------
> Subject: Small *diesel* generators
> Date: Fri, 08 Jun 2007 17:47:48 -0500
> From: zxcvbob <zxcvbob@charter.net>
> Newsgroups: alt.home.repair
>
> I was tempted to buy a Honda 2000 watt electronic generator at the state
> fair last year because they were on special for $899. (that's a great
> price) I decided not to get one because (1) I hate spending $900+ and
> (2) the electric power here is very reliable.
>
> But I'm still interested in emergency generators even if I may never get
> one.
>
> Does anyone have experience with 2kw to 5kw diesel generators? Yanmar
> makes them -- very expensive and hard to find -- and there are Chinese
> knockoffs for less than $1000. (If you search on "Yanmar diesel
> generator" you will probably find more links for the Chinese generators
> that just have the word "Yanmar" in the page somewhere.)
>
> They run at 3600 RPM rather than the 1800 I expected. So is there any
> real advantage over gasoline? How long do 3600 RPM diesel engines last?
> Gasoline engines are sometimes only rated for a few hundred hours. The
> online specs never give this rating. I guess it's safer to store 100
> gallons of diesel fuel during the blizzard (or hurricane, or whatever)
> season than it is 150 gallons of gasoline.
>
I've had two eu2000s. The first one lasted about 12,000 hours and the
second only about 7000 hours. Most of the time they were running at about
1/3 load so they engine speed was greatly reduced from the maximum, which I
suppose is 3600 rpm (though some people here have said that an eu2000 won't
start producing output until it reaches 2800 rpm--this I do not accept).
Honda made it pretty easy to drain the carburator for storage. I always add
a little Sta-Bil to the last bit of gas, run it, then drain the carb and
spray it with carb cleaner by removing the float bowl. You can also get a
conversion kit for propane and then you won't have to worry about fuel
spoiling. BTW they are (were recently anyway) selling for $895 in South
California.
I know nothing about diesels.
> Bob
| |
| Pete C. 2007-06-10, 9:25 am |
| Ulysses wrote:[color=darkred]
>
> "zxcvbob" <zxcvbob@charter.net> wrote in message
> news:5cu7atF324obhU1@mid.individual.net...
>
> I've had two eu2000s. The first one lasted about 12,000 hours and the
> second only about 7000 hours. Most of the time they were running at about
> 1/3 load so they engine speed was greatly reduced from the maximum, which I
> suppose is 3600 rpm (though some people here have said that an eu2000 won't
> start producing output until it reaches 2800 rpm--this I do not accept).
> Honda made it pretty easy to drain the carburator for storage. I always add
> a little Sta-Bil to the last bit of gas, run it, then drain the carb and
> spray it with carb cleaner by removing the float bowl. You can also get a
> conversion kit for propane and then you won't have to worry about fuel
> spoiling. BTW they are (were recently anyway) selling for $895 in South
> California.
>
> I know nothing about diesels.
>
What were the failures when the EUs died?
Pete C.
| |
| Ulysses 2007-06-11, 5:25 pm |
|
"Pete C." <aux3.DOH.4@snet.net> wrote in message
news:466BE7E7.6FAFFF1E@snet.net...
> Ulysses wrote:
state[color=darkred]
get[color=darkred]
generators[color=darkred]
last?[color=darkred]
The[color=darkred]
about[color=darkred]
which I[color=darkred]
won't[color=darkred]
add[color=darkred]
a[color=darkred]
>
> What were the failures when the EUs died?
On both of mine the so-called "governor gear" broke. This is a small
plastic gear that is in the same position as a governor gear inside, say, a
Honda GX engine but since the engine speed is governed by electronics
controlling the carburator the only real purpose I can see for this plastic
gear is to lubricate the engine parts by splashing oil everywhere. It looks
like it could also dampen the engine speed a little because it has fins that
are partially immersed in the motor oil. In both case the engine failed due
to, from what I can see, lack of lubrication. I'm going to be taking eu2000
#2 to a third authorized Honda dealer to see if Honda will replace the
cylinder, piston, crankshaft, piston rod, etc. If they don't fix it I
probably won't be buying any more Hondas. I think for $900 I should get
something with an engine that can be rebuilt.
The really sad part is that I knew more about the insides of the eu2000
engines that either of the Honda Authorized Service Centers guys knew. And
I don't think I know all that much.
>
> Pete C.
| |
| Pete C. 2007-06-11, 9:25 pm |
| Ulysses wrote:[color=darkred]
>
> "Pete C." <aux3.DOH.4@snet.net> wrote in message
> news:466BE7E7.6FAFFF1E@snet.net...
> state
> get
> generators
> last?
> The
> about
> which I
> won't
> add
> a
>
> On both of mine the so-called "governor gear" broke. This is a small
> plastic gear that is in the same position as a governor gear inside, say, a
> Honda GX engine but since the engine speed is governed by electronics
> controlling the carburator the only real purpose I can see for this plastic
> gear is to lubricate the engine parts by splashing oil everywhere. It looks
> like it could also dampen the engine speed a little because it has fins that
> are partially immersed in the motor oil. In both case the engine failed due
> to, from what I can see, lack of lubrication. I'm going to be taking eu2000
> #2 to a third authorized Honda dealer to see if Honda will replace the
> cylinder, piston, crankshaft, piston rod, etc. If they don't fix it I
> probably won't be buying any more Hondas. I think for $900 I should get
> something with an engine that can be rebuilt.
>
> The really sad part is that I knew more about the insides of the eu2000
> engines that either of the Honda Authorized Service Centers guys knew. And
> I don't think I know all that much.
Thanks for the info, I'll have to watch out for that on mine. Makes me
happy I'm using Mobil 1 in it like I use on most everything these days.
Pete C.
| |
| Vaughn Simon 2007-06-12, 9:25 am |
|
"Ulysses" <therealulysses@yahoo.com> wrote in message
news:136re9fa3at59bc@corp.supernews.com...
> If they don't fix it I
> probably won't be buying any more Hondas. I think for $900 I should get
> something with an engine that can be rebuilt.
At least you can take pleasure in knowing that both machines easily paid
for themselves in just the gas they saved over a Home Depot-class machine. I
think we can assume that nor real parts support is available for the off-brand
inverter generators, so that only leaves Yamaha if you want a portable inverter
genny. Are they any better? My shop has two 1000-watt Yamahas that we keep to
power up network gear. They run like clocks, but I doubt that we will ever have
enough hours on them to know how good they really are.
I have had my EU-2000 for two years now, and it has had no more than 5 or 6
tanks of gas put through it, so the situation there is about the same.
Vaughn
| |
| Pete C. 2007-06-12, 9:25 am |
| Ulysses wrote:[color=darkred]
>
> "Pete C." <aux3.DOH.4@snet.net> wrote in message
> news:466BE7E7.6FAFFF1E@snet.net...
> state
> get
> generators
> last?
> The
> about
> which I
> won't
> add
> a
>
> On both of mine the so-called "governor gear" broke. This is a small
> plastic gear that is in the same position as a governor gear inside, say, a
> Honda GX engine but since the engine speed is governed by electronics
> controlling the carburator the only real purpose I can see for this plastic
> gear is to lubricate the engine parts by splashing oil everywhere. It looks
> like it could also dampen the engine speed a little because it has fins that
> are partially immersed in the motor oil. In both case the engine failed due
> to, from what I can see, lack of lubrication. I'm going to be taking eu2000
> #2 to a third authorized Honda dealer to see if Honda will replace the
> cylinder, piston, crankshaft, piston rod, etc. If they don't fix it I
> probably won't be buying any more Hondas. I think for $900 I should get
> something with an engine that can be rebuilt.
>
> The really sad part is that I knew more about the insides of the eu2000
> engines that either of the Honda Authorized Service Centers guys knew. And
> I don't think I know all that much.
BTW, if you still have the dead units I'd be interested in buying one or
both for parts. Email me (remove .DOH.) if interested.
Pete C.
| |
| Steve Spence 2007-06-12, 8:25 pm |
| Listeroids come in 6hp to 24hp, but I wouldn't call the 6hp "small". They
work great on everything from veggie to motor oil and tranny fluid.
--
Steve Spence
Director, Green-Trust
http://www.green-trust.org
"Pete C." <aux3.DOH.4@snet.net> wrote in message
news:466E9734.AAF7142B@snet.net...
> Ulysses wrote:
>
> BTW, if you still have the dead units I'd be interested in buying one or
> both for parts. Email me (remove .DOH.) if interested.
>
> Pete C.
| |
| (PeteCresswell) 2007-06-12, 8:25 pm |
| Per Steve Spence:
>Listeroids come in 6hp to 24hp, but I wouldn't call the 6hp "small". They
>work great on everything from veggie to motor oil and tranny fluid.
This link http://www.kk.org/cooltools/archives/001011.php
cites a claim of .3 gallons per hour @8,000 watts.
Sheesh! I'm pretty sure my EU2000 burns more than that.
--
PeteCresswell
| |
| William Dryden 2007-06-12, 9:25 pm |
|
"Ulysses" <therealulysses@yahoo.com> wrote in message
news:136llhq4mvl59cd@corp.supernews.com...
>
> I've had two eu2000s. The first one lasted about 12,000 hours and the
> second only about 7000 hours. Most of the time they were running at about
> 1/3 load so they engine speed was greatly reduced from the maximum, which
I
> suppose is 3600 rpm (though some people here have said that an eu2000
won't
> start producing output until it reaches 2800 rpm--this I do not accept).
I am surprised no one has told you this yet, but you better hope the engine
was running the full 3600 RPM all the time. The engine speed controls the
frequency of the AC coming out of the generator and has nothing to do with
how heavily it is loaded. If it was only running 2700 RPM you would have 45
Hz AC and it would fry any motors you were trying to run.
| |
| Ecnerwal 2007-06-12, 9:25 pm |
| In article <m6hu63923kp38fj0apgeatvvf567r1uuua@4ax.com>,
"(PeteCresswell)" <x@y.Invalid> wrote:
> This link http://www.kk.org/cooltools/archives/001011.php
> cites a claim of .3 gallons per hour @8,000 watts.
I sincerely doubt that it is an accurate claim. More likely an 8KW
generator head, and a genset that burns 0.3 GPH with whatever typical
load (averaging much less than 8KW) is actually being run from it. Hype
writers tend to blur those little details, either deliberately or
through excess uninformed, non-critical enthusiasm.
Just Say: 0.0375 gallon/KWh is not bloody likely.
--
Cats, coffee, chocolate...vices to live by
| |
| Ecnerwal 2007-06-12, 9:25 pm |
| In article <ZOHbi.25305$YL5.18173@newssvr29.news.prodigy.net>,
"William Dryden" <william_dryden@sbcglobal.net> wrote:
> I am surprised no one has told you this yet, but you better hope the engine
> was running the full 3600 RPM all the time. The engine speed controls the
> frequency of the AC coming out of the generator and has nothing to do with
> how heavily it is loaded. If it was only running 2700 RPM you would have 45
> Hz AC and it would fry any motors you were trying to run.
You don't know what an eu2000 is, or how it works, or the difference
between a hole in the ground and another sort of hole. Engine speed has
exactly no effect whatever on frequency out for an eu2000, or any other
inverter-generator.
--
Cats, coffee, chocolate...vices to live by
| |
|
|
| Neon John 2007-06-13, 9:25 am |
| On Tue, 12 Jun 2007 21:15:06 -0400, "(PeteCresswell)" <x@y.Invalid> wrote:
>Per Steve Spence:
>
>This link http://www.kk.org/cooltools/archives/001011.php
>cites a claim of .3 gallons per hour @8,000 watts.
>
>Sheesh! I'm pretty sure my EU2000 burns more than that.
I started out writing an analysis of this but it got complicated enough that I
decided to make a blog entry instead. That way I could use
pictures'n'graphics'n'stuff.
http://www.johndearmond.com/2007/06...and-listeroids/
Executive summary: Ain't no way a small engine is going to achieve 0.3 gph at 8KW.
John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Cleveland, Occupied TN
I'm going crazy. Wanna come along?
| |
| Bruce in Alaska 2007-06-13, 5:25 pm |
| In article <ZOHbi.25305$YL5.18173@newssvr29.news.prodigy.net>,
"William Dryden" <william_dryden@sbcglobal.net> wrote:
> "Ulysses" <therealulysses@yahoo.com> wrote in message
> news:136llhq4mvl59cd@corp.supernews.com...
> I
> won't
>
> I am surprised no one has told you this yet, but you better hope the engine
> was running the full 3600 RPM all the time. The engine speed controls the
> frequency of the AC coming out of the generator and has nothing to do with
> how heavily it is loaded. If it was only running 2700 RPM you would have 45
> Hz AC and it would fry any motors you were trying to run.
>
>
Hmmm, obviously this guy (the Commenter) isn't familiar with the Honda
Generator/Inverter Technology.
Bruce in alaska
--
add a <2> before @
| |
| sylvan butler 2007-06-13, 5:25 pm |
| On Wed, 13 Jun 2007 01:32:41 GMT, William Dryden <william_dryden@sbcglobal.net> wrote:
> "Ulysses" <therealulysses@yahoo.com> wrote in message
> news:136llhq4mvl59cd@corp.supernews.com...
[color=darkred]
> I am surprised no one has told you this yet, but you better hope the engine
> was running the full 3600 RPM all the time. The engine speed controls the
I'm suprised at your temerity to correct someone when you have no clue...
> frequency of the AC coming out of the generator and has nothing to do with
> how heavily it is loaded. If it was only running 2700 RPM you would have 45
> Hz AC and it would fry any motors you were trying to run.
1) he said he was using an eu2000. From that model number and its
context it is reasonable to conclude the generator is a honda inverter
generator. With those the engine speed is whatever is needed to meet
the load and the inverter always provides proper frequency A.C. out.
2) It is trivial to design a generator to run at some fixed speed other
than 3600RPM. Only a two-pole alternator direct-coupled to the engine
needs the engine to be run at 3600RPM for 60hz output.
sdb
--
What's seen on your screen? http://pcscreenwatch.com
sdbuse1 on mailhost bigfoot.com
| |
| (PeteCresswell) 2007-06-13, 8:25 pm |
| Per Neon John:
>Executive summary:
Did you mention looking for a Lister mailing list?
This was cited on one of RocketBoy's pages:
http://listerengine.com/smf/index.php
--
PeteCresswell
| |
| Neon John 2007-06-14, 3:25 am |
| On Wed, 13 Jun 2007 20:21:54 -0400, "(PeteCresswell)" <x@y.Invalid> wrote:
>Per Neon John:
>
>Did you mention looking for a Lister mailing list?
>
>This was cited on one of RocketBoy's pages:
> http://listerengine.com/smf/index.php
>
>
Thanks. I missed that. He's added some pages since I last visited.
John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Cleveland, Occupied TN
What do you call 4 Blondes in an Abrams? Air Tank.
| |
| Ulysses 2007-06-15, 3:25 am |
|
"Vaughn Simon" <vaughnsimonHATESSPAM@att.FAKE.net> wrote in message
news:8iubi.147236$p47.105542@bgtnsc04-news.ops.worldnet.att.net...
>
> "Ulysses" <therealulysses@yahoo.com> wrote in message
> news:136re9fa3at59bc@corp.supernews.com...
>
> At least you can take pleasure in knowing that both machines easily
paid
> for themselves in just the gas they saved over a Home Depot-class machine.
I
> think we can assume that nor real parts support is available for the
off-brand
> inverter generators,
Much to my surprise I found parts fairly easy to get for my cheap Chinese
generators. Matter-of-fact my UST 5500 is at Sears getting warranty repair.
Ironically it is not done yet cause they are waiting for parts. Hmmm.
Anyway, when the float got stuck on the carb I called them and they sent me
a new carburator in about a week or so. What's wrong with it now is it was
overloaded by my chargers on my Outback inverters. Maybe outback should be
fixing it (I was following their instructions). Otherwise I like it better
than my Honda GX powered 5000 watt genny because it runs smoother, is
quieter, has more power, and uses a bit less gas. But the Honda ran my well
pump daily for over 4 years before it had any major problems so we'll see.
My UST 2300 now has nearly 1100 hours on it. If it makes it past 1700 hours
it will have surpassed my last Honda eu2000 as far as hours per dollar spent
goes. So far it still runs smoothly, is pretty good on gas, always starts
in one pull, and the oil looks good at changes. The main problem that I see
with the USTs is that the alternator bracket is also the engine case so you
can't just stick a generic alternator on there if the original should fail.
so that only leaves Yamaha if you want a portable inverter
> genny. Are they any better? My shop has two 1000-watt Yamahas that we
keep to
> power up network gear. They run like clocks, but I doubt that we will
ever have
> enough hours on them to know how good they really are.
>
> I have had my EU-2000 for two years now, and it has had no more than 5
or 6
> tanks of gas put through it, so the situation there is about the same.
>
> Vaughn
>
>
| |
| Ulysses 2007-06-15, 3:25 am |
|
"Pete C." <aux3.DOH.4@snet.net> wrote in message
news:466E9734.AAF7142B@snet.net...
> Ulysses wrote:
great[color=darkred]
and[color=darkred]
never[color=darkred]
Yanmar[color=darkred]
Chinese[color=darkred]
any[color=darkred]
100[color=darkred]
whatever)[color=darkred]
the[color=darkred]
eu2000[color=darkred]
accept).[color=darkred]
always[color=darkred]
and[color=darkred]
get[color=darkred]
fuel[color=darkred]
South[color=darkred]
say, a[color=darkred]
plastic[color=darkred]
looks[color=darkred]
that[color=darkred]
due[color=darkred]
eu2000[color=darkred]
And[color=darkred]
>
> BTW, if you still have the dead units I'd be interested in buying one or
> both for parts. Email me (remove .DOH.) if interested.
>
I just dropped off #2 today at the 3rd Honda Repair place and they sound
like they know what they are doing so it may actually get repaired. #1 is
now a belt-driven generator head powered by a 4 HP Honda. I used it today
to run a battery charger and it ran at just above idle for about 5 or 6
hours on 1 1/2 quarts of gas. It's not a lunchbox any more but it's still a
good inverter generator.
> Pete C.
| |
| Ulysses 2007-06-15, 3:25 am |
|
"Ecnerwal" <LawrenceSMITH@SOuthernVERmont.NyET> wrote in message
news:LawrenceSMITH-B2CE57.21540212062007@news.verizon.net...
> In article <ZOHbi.25305$YL5.18173@newssvr29.news.prodigy.net>,
> "William Dryden" <william_dryden@sbcglobal.net> wrote:
>
engine[color=darkred]
the[color=darkred]
with[color=darkred]
have 45[color=darkred]
>
> You don't know what an eu2000 is, or how it works, or the difference
> between a hole in the ground and another sort of hole. Engine speed has
> exactly no effect whatever on frequency out for an eu2000, or any other
> inverter-generator.
>
> --
This is why it's important to copy the thread with replies so misinformation
is easier to sort out. I guess I have to go back and see what the
misinformed reply was replying to.
> Cats, coffee, chocolate...vices to live by
| |
| Neon John 2007-06-15, 3:25 am |
| On Thu, 14 Jun 2007 22:32:52 -0700, "Ulysses" <therealulysses@yahoo.com> wrote:
>I just dropped off #2 today at the 3rd Honda Repair place and they sound
>like they know what they are doing so it may actually get repaired. #1 is
>now a belt-driven generator head powered by a 4 HP Honda. I used it today
>to run a battery charger and it ran at just above idle for about 5 or 6
>hours on 1 1/2 quarts of gas. It's not a lunchbox any more but it's still a
>good inverter generator.
>
Have any pictures? I'd like to see that hack.
John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Cleveland, Occupied TN
What do you call a blonde's dildo? Pneumatic tool.
| |
| Ulysses 2007-06-15, 1:25 pm |
|
"Neon John" <no@never.com> wrote in message
news:dti473djlgp0sqfs9jcf6jg29fh6v449id@4ax.com...
> On Thu, 14 Jun 2007 22:32:52 -0700, "Ulysses" <therealulysses@yahoo.com>
wrote:
>
>
sound[color=darkred]
is[color=darkred]
today[color=darkred]
still a[color=darkred]
>
> Have any pictures? I'd like to see that hack.
It's not pretty enough yet to take any pictures ;-) I think I got a couple
of "bugs" worked out if it--it was making a funny noise inside the crankcase
probably because I removed the oil splasher gear and lubed the crankshaft
with grease. Apparently that was not quite enough lubrication so I
overfilled the crankcase with oil. I hope to post some pictures soon.
I was just about to attach it to a cart and do a little painting etc when I
decided I'd better go back and read again what you said about voltage
regulators in 12 volt alternators. From everything I've read that would
probably get me about 14 amps at 56 volts and would be the cheapest solution
if only temporary.
Also, yesterday I took a 12 VDC fan (car heater blower) motor and spun it in
a drill. At about 2000 rpm it was outputting about 7.5 volts. I had
measured the current draw a while back at about 7 amps with a 12" fan blade
on it. So, my question is: is there a rule of thumb to determine how much
voltage and current a permanent magnet DC motor will put out? From this
little experiment it looks like I would need a 24 VDC motor to get 12 volts
(adjust speed as needed). I think you said that a 20 amp motor (for
example) will put out about 20 amps if used as a generator but I assume that
will vary with speed/voltage.
>
> John
> ---
> John De Armond
> See my website for my current email address
> http://www.neon-john.com
> http://www.johndearmond.com <-- best little blog on the net!
> Cleveland, Occupied TN
> What do you call a blonde's dildo? Pneumatic tool.
>
| |
| Neon John 2007-06-15, 8:25 pm |
| On Fri, 15 Jun 2007 10:10:29 -0700, "Ulysses" <therealulysses@yahoo.com> wrote:
>Also, yesterday I took a 12 VDC fan (car heater blower) motor and spun it in
>a drill. At about 2000 rpm it was outputting about 7.5 volts. I had
>measured the current draw a while back at about 7 amps with a 12" fan blade
>on it. So, my question is: is there a rule of thumb to determine how much
>voltage and current a permanent magnet DC motor will put out? From this
>little experiment it looks like I would need a 24 VDC motor to get 12 volts
>(adjust speed as needed). I think you said that a 20 amp motor (for
>example) will put out about 20 amps if used as a generator but I assume that
>will vary with speed/voltage.
It should be exactly reciprocal - a 12 volt motor that spins at 1000 rpm should
generate 12 volt when spun at 1000 rpm. The magnetic circuit is so bad in the
typical cheap automotive motor that it usually doesn't hold true. I suggest moving
up a bit on the quality scale.
Pretty much any motor converted to a generator is going to have to have the brushes
retimed. The magnetic field is distorted in the opposite direction when generating
so the brushes must be moved to find the new neutral (no sparking) point.
This usually involves cutting slots in the brush holder or end bell if they don't
already exist. Put a load on the generator and adjust for minimum sparking. There
are more scientific methods of brush timing but that's good enough.
John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
http://www.johndearmond.com <-- best little blog on the net!
Cleveland, Occupied TN
If we aren't supposed to eat animals, why are they made with meat?
| |
| China diesel owner 2007-07-12, 3:25 am |
|
"zxcvbob" <zxcvbob@charter.net> wrote in message
news:5cu7atF324obhU1@mid.individual.net...
> Reposting this here. Thanks.
>
[snip]
> Does anyone have experience with 2kw to 5kw diesel generators? Yanmar
> makes them -- very expensive and hard to find -- and there are Chinese
> knockoffs for less than $1000. (If you search on "Yanmar diesel
> generator" you will probably find more links for the Chinese generators
> that just have the word "Yanmar" in the page somewhere.)
>
> They run at 3600 RPM rather than the 1800 I expected. So is there any
> real advantage over gasoline? How long do 3600 RPM diesel engines last?
> Gasoline engines are sometimes only rated for a few hundred hours. The
> online specs never give this rating. I guess it's safer to store 100
> gallons of diesel fuel during the blizzard (or hurricane, or whatever)
> season than it is 150 gallons of gasoline.
>
> Bob
I have two "silent" Chinese types, on wheels, fully enclosed, with the
Yanmar engine knockoffs.
The units start in just a few revolutions. The exhaust becomes smokeless
after a few minutes running with a dummy load. The internal fit and finish
are very fine. The engine is overbuilt like the Yanmar; it has an iron
sleeve, roller bearings, and pressure lubrication. The electrical wiring is
neat, and the components appear to be of good quality.
On the other hand, these units still have some of the "small shop" quality
of integration. They are not as thoroughly designed as systems as the more
refined Yamaha and Honda products. The most notable problem I have heard of
is that the voltage regulators tend to fall off; one dealer glues them in
place. Shipping damage is fairly common. One unit had a bad ignition switch
that drained the battery. The core components appear to be durable. On the
other hand, I haven't tried to get a genhead repaired.
The units appear to run much cooler than a Yamaha ESI3000. The outer casing
does not even get warm to the touch under a maintenance run. The engine is
touchable immediately afterwards. This bodes well for durability under heavy
load.
| |
| Ecnerwal 2007-07-12, 1:25 pm |
| In article <_oSdnaYezJ73NQjbnZ2dnUVZ_oGlnZ2d@giganews.com>,
"China diesel owner" <nowhere@nowhere.org> wrote:
> does not even get warm to the touch under a maintenance run. The engine is
> touchable immediately afterwards. This bodes well for durability under heavy
> load.
Actually, it bodes well for water in the oil. If your maintenance run is
not getting the thing hot enough to boil out condensate, it's probably
not doing much for maintenance. Try a longer run or a heavier load on it.
With adequate serious classified shopping, a used US-made 1800 rpm
diesel with good parts availability can be obtained in the $2K and under
price range.
--
Cats, coffee, chocolate...vices to live by
| |
|
| On Jul 12, 5:58 am, Ecnerwal <LawrenceSM...@SOuthernVERmont.NyET>
wrote:
> With adequate serious classified shopping, a used US-made 1800 rpm
> diesel with good parts availability can be obtained in the $2K and under
> price range.
================================================
Hey Larry.... I tried that trick with using my name backwards as a
user name, but it didn't work! -Bob
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