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Buying a generator need advice!

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AlCin Wi

03-23-2006 08:22:13




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I'm going to buy a portable generator to use mainly with a 5th wheel camper (for going to tractor shows). It would ride in the back of the truck.
The camper has a 15k BTU ac and HAS to hsve a 30A circuit for the camper to plug into. Can I get away with a 5kW unit or will I have to go bigger? Anybody recomend one brand over the other?
I also plan on adding an extra muffler as all generators nowdays can be heard for a mile, how well do these work? Can a person actually run one in a campground - park environment?
This will be my first and hopefully last generator I buy for quiite awhile so I want to get the right one. SO if anyone has some advice I'd sure appreciate it, Thanks

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CaptRon

03-25-2006 23:40:25




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
You can't beat experience... I've run two of the Honda EU200i's for the last two years and they are the best thing since sliced bread. Definately everything that I'd heard and read about them was true. I'm a full time rver and have used my pair for weeks on end, sometimes running them constantly for 3-4 days non-stop. My last two 5th wheels were 50amp systems and I made a parallel adapter with $40 in parts from Lowes. Also I made an external fuel tank from a 6 gallon boat tank from Wal-mart. My parallel cable has a 30amp receptacle and I use a 30/50amp adapter. My 5vers also have 15,000 btu A/C units and my pair have no problems starting them even in ECO mode. Keep in mind too that a 50amp RV plugs into a 220volt receptacle and the 220 is split in the breaker panel like regular house wiring. All of the systems however operate on 110volts though. When you use a 30amp adapter the two 220volt legs are tied together. Connecting two Honda generators together will not give you 220volts (Tim B from MA).
I rewired my present 5th wheel with a power cord to the hitch and travel with my Hondas in the right rear corner of my truck bed. They are under the camper overhang that way and I can plug in to run the A/C while traveling so that when I stop at a truckstop for the night the camper is already cool. I run a cord up to the cab of the truck too so that I can power my laptop for extended periods. When I get to my destination I can set the pair on the ground under the camper overhang like DAB does. He's also correct on the weight issues. One other big thing about the Hondas is that they are great on gas, that's where the inverter design and ECO mode really come into play, they only run at a speed that's required to carry the load. Last August I had to run mine non-stop for three days and only burned less than 5 gallons of gas a day. That's for 24 hours each day. The people that I bought my land from here in NC offered to pay for our gas since it was their contractor that caused the delay in our power service. They were shocked to find out that I only had receipts totaling $30. My generators where running as we stood in the driveway discussing the power problem and we could clearly hear the A/C running but I had to take them to the side of my camper to show them that I was indeed running on generator power. To say that they were amazed would be an understatement.

The Chinese generators... I read that thread on RV.net too and last year I told everyone at the campground in SC about it too. Problem was that we couldn't find any for months and I finally scored two of the PowerPro 3500's at the local Pep Boys for $299/ea. They had a 220volt outlet and I made an adapter from the twist lock to the rv plug. It ran my A/C fine but had trouble starting the microwave at the same time. They had a huge muffler and a Honda knockoff engine so were very quiet, almost as much as the Honda's. They ran at 3600rpm so they used a bit more fuel too...about 3 times the fuel as a matter of fact.
I sold one to my next door neighbor the first day and two days later I sold the other one to another friend after I wrenched my back moving the 100 lbs that they weighed. The last one got permanently mounted in the front compartment of his 40' 5th wheel. He fabricated an external exhaust pipe and fuel system and has used this generator on several trips in the last year.

Some of these guys got rain checks and one morning a buddy knocked on my door saying that Pep Boys had called and they had more in stock, did I want to go. I ended up buying my third unit and my wife was none too happy when she found out, after all I already had the Hondas that I paid $1751 for... why did I need another generator. "Because they're neat" just wasn't good enough for her but I loaded it in the front compartment and when we got to Iowa I showed it to my uncle. He had a Generac that would break your eardrums at 40 paces...when I cranked that PowerPro he immediatley loaded that Generac in his truck and took it to town and sold it to a guy that he knew was looking for one. In fact when he cranked it for the guy I made sure that I was well away from that miserably loud SOB. BTW, he had put a Toyota muffler on it and it was still ungodly loud.

Recently some high winds have caused power outages which aren't really a concern this time of the year with the camper but I loose the internet and that torques me. So I pull out one of the Hondas and have the camper back online in about 3 minutes. I have to plug a light into the power pole to see when power is back on. I switch the refer and water heater to gas while running on the generators.

I could go on but I think that you get the idea... the Hondas are the way to go and I'd buy them again if I need to.

Recently I was in my local RV parts house and noticed that he was selling the Kipor line of Honda clones. From what I've heard these are supposed to be pretty good too. You can find them on Ebay.

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JT

03-25-2006 08:06:50




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
Briggs and Stratton portable power makes a nice little 5.5KW generator for about $850.00. They are quiet, have a 7250 surge, has a 30a 220 plug in on the generator. They are not as quiet as the Honda, but they are not as pricey as a Honda and are just as good of a system. I can start mine and carry on a conversation standing next to it. or you can go to a 7kw for about 1100.00 with a 8500 surge. Don;t make sense to pay for a name.

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Robert in W. Mi.

03-24-2006 12:37:02




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
Honda now makes inverter gen sets in 5,000 and 6,500 watt's for bigger loads. One of these should work just fine for you.

I have there 2,000 watt. inverter genset, and i really like it. It gets many uses here on the farm.

Honda gensets are quieter, use less fuel and have longer oil change intervals than the cheapo units.

Robert



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AlCin Wi

03-24-2006 07:22:50




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 Thanks and a couple more questions in reply to AlCin Wi, 03-23-2006 08:22:13  
Thanks for all the comments guys.

I think I"m leaning towards honda 3000 EU series but HOLY CR@P Honda sure is proud of "em!! The one other thing that I would like is to be able to run on LP. I did a quick search for conversion kits but didn"t find any for the EU series.

Someone mentioned the Chineese knock offs- This unit would probably only see 150-200 hours per year, not that much really, but I don"t want to be messing with the thing setting up the camper @ 10pm in the dark! and the wife needs to be able to use it too.
Thanks for all your ideas lots of things I didn"t think of.

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Tim B from From MA

03-24-2006 06:25:59




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
Al, get an inverter generator made for the purpose - it will probably cost about an extra $1k, but anything less will be a waste for using while camping. You don't want to site around in a nice setting listening to a loud generator and wondering how many neighbors are going to start throwing stones at you as they drive by.

I don't know what my AC is rated for BTUs, but I have a 34 foot fifth wheel, the AC is more than adequate, and if I recall correctly, from when I was shopping for a generator, it has a start up draw of 19A

A 3KW generator is plenty.

And check out Mayberry's. I have no affiliation with them except I bought the generator and a backpack blower from them because the prices where unbeatable, and their service was fine as can be.

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RickL

03-24-2006 00:39:00




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
I have a used coleman 10000 watt unit used about a month don't need it know. Most campgrounds generator shut off is 10pm



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jdemaris

03-23-2006 20:31:41




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
If you're willing to spend the money, sounds like you need a DC generator, not AC. With AC, the RPM can't vary much since the Hertz cycle is determined by the engine speed. With DC, the generator only has to rev up enough to meet the load since it makes DC which is then run though a full-wave inverter to make AC. Honda and Yamaha have some excellent DC to AC inverter generators that have the side benefit of a large 120 VAC draw. I worked with several people using them in hybrid solar-electric systems, and they do the work of larger AC generators but are much quiter. Also expensive.

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jeffcat

03-23-2006 17:13:29




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
Like everyone else said go with the Honda. Very quiet units. Almost creepy how quiet they are. I got a real deal on a return unit two summers ago at Lowes. 5200 watt unit with a 10hp Tecumseh on it. DA--M was that thing ever LOUD!!!! Local mower parts place I picked up a quite run mufffler for about $60.00. I think it is a Tilson or Tilton, something like that. It is black and has some weight to it. See if you can find some one with a Super Trapp mufler. Neat looking and very quiet. It WILL make the engine run a lot quieter. Don't buy at the camper store unless you like spending a LOT of money. Mower parts should have it. Also make sure you will not have HEAT problems with your new muffler. I installed a shield under the gas tank so it was safe on my gen set. Pep Boys has the Chiness knock off gens. That little blue one for a little over $100 is VERY quiet. Jeffcat

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buickanddeere

03-23-2006 14:27:24




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
To start that AC compressor it will needs at 10Kva generator minimum. That leaves mighty little cushion for other loads being on at the same time. Nobody ever regretted going up a size or two larger on a generator than what they "need".



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Tim Casbolt

03-23-2006 13:37:27




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
I agree that you would want more capacity than a 5 kw has to offer. Probably 7-8 kw would be enough and still provide a cushion. I'm partial to the Onan generators. Not only for their quiet operation (they run at 1800 rpm instead of 3600 like most others), but also for their reliability. Mine runs on propane, which is more environmentally friendly, and doesn't cause sticky float problems like gas does when it sits around for a long time. There are some good deals on Ebay if you keep your eyes open. A gasoline version can be converted to propane with a simple kit from a company like propanecarbs.com. Takes a few minutes to install and works perfectly.

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Tim B from MA

03-23-2006 13:12:46




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
I believe dab is talking about Honda's EU series, they come in 1000, 2000, and 3000w. These are made specifically for camping and similar situations where very quite machines are needed. You will definitely need such a machine, or build a box for one that, maybe, will make it as quite. People who run regular, noisy generators at campgrounds are a$$^o1es, IMHO. Plus, you won't be allow to run them at National Parks and, probably, most State parks.

I have a 3000w Honda EU machine that I am very happy with. It runs my AC fine - you should check your AC to see its requirement for start-up amps. 3000w is about 25 amps at 120v - I am guessing that will be plenty for you (note the continuous output rating for the generator is about 2750w).

I hadn't though about dab's idea of getting 2 2000w machines and hooking them together. That would also give you some 220v power. Alone these Honda machines are just 110v.

I bought mine "on the net" from a Mayberry's, which is a power equipment dealer in NJ.

Link

They sold it to me for much less than I could get it locally, even though I gave local folks the chance to match it or even come close - they could not.

Good luck

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souNdguy

03-23-2006 12:42:51




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
Well..lets see... 20a times 240v is 4800 watts. Looks like you are a tad shy. If you needed a 30a breaker, allowing for surge and all ).. then you need a unit that will surge to 7200watts.. I've not seen many 5500w untis that will surge to 7200w.. I think you would be better off with a 7500w-8000w unit. I've seen many 6500w units that will surge 7200 and 7500.. but then.. what does that leave you to run the rest of the rv? What is the run current after start on the AC?? Probably cheaper to get mor genny thatn you need, when looking at the minimums.. etc.

Soundguy

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KEB

03-23-2006 18:58:11




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 Re: Buying a generator need advice! in reply to souNdguy, 03-23-2006 12:42:51  
30 amps on an RV (I have a fifth wheel trailer) is at 120 volts, not 240 volts. Some newer high end RV's have 50 amp service, which is 240 volt. 30 amps at 120 volts is 3600 watts; allowing for some power factor a 4kVA generator should be plenty big enough to run everything.

A lot of people run air conditioners on the Honda and Yamaha 3000 watt inverter type generators. An air conditioner on a 20 amp circuit should only draw 16 amps (80% of breaker rating)under full load, which is 1920 watts (ignoring power factor).

The issue comes in when you try to start the air conditioner, and the generator doesn't have enough surge capacity. You can fix that with a soft start kit for your air conditioner (see your local RV dealer if you have a problem starting the AC on the generator). Once its running it doesn't take that much power to keep it running.

One thing to keep in mind when buying a non-RV generator is that the rated output is at 240 volts, which means you can only draw half the rated power at 120 volts. Some of the newer generators come with a provision to put the windings in parallel rather than series, which gives the full output at 120 volts. I saw this feature on one of the e-cheapo Chinese knockoff generators at Costco not too long ago.

The bigger generators like you see on motorhomes typically have two 120 volt output circuits. I had an older motor home with a 6.5 kW Onan. It had two 120 volt circuits, and ran one air conditioner off of each one. We could only run one air conditioner at a time (switch selectable) on shore power, which was a 30 amp, 120 volt circuit.

The Honda & Yamaha generators are nice, but really expensive. Some of them also have electric start. I have an older 750 watt Honda that will run everything in the trailer except the microwave and air conditioner, and you can't hardly hear it running. Some day I'll get a real RV generator! We also have one of the Lowes special 5.5 kW generators, which runs everything of off one side of the 240 volt output just fine but is way too noisy to use in a campground. For camping we use it mostly on our land in the mountains where we're quite a distance from the nearest neighbor, and then only when we need the air conditioning or microwave.

If you really want to research generators, go to RV.net and read some of the threads on the tech board. There's one that addresses these Chinese knockoff generators thats several hundred posts long. Believe it or not, most people who have them are happy with their performance, and they appear to be a great cheap alternative if you're not using it day in & day out. Have no personal experience with them, though.

One final bit of advice, don't count on a bigger muffler to bring the noise level down very far. A lot of the noise from these generators is mechanical, not from the exhaust. That's why the really quiet ones are fully enclosed.

Keith

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souNdguy

03-23-2006 19:51:08




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 Re: Buying a generator need advice! in reply to KEB, 03-23-2006 18:58:11  
Some o fthe things you pointed out were the points I was trying to make. Just because a unit is rated at.. say.. 7500w @ 240v.. it does not mean you get 7500w at 120v.. etc.

Soundguy



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dab

03-23-2006 09:02:58




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 Re: Buying a generator need advice! in reply to AlCin Wi, 03-23-2006 08:22:13  
Go with a honda. They are very quiet and you can hook them in parallel if you need to. Bought two and hooked them together and can't even hear them run when the air is on in the trailer. They aren't cheap. About $2000.00 for both of them. Could have bought one big one that would handle the same for about $150.00 less but the nice thing about these is my 73 year old dad can easily lift them up and put them in the truck. plus if not running the air only need to use one. Most places have a 10 o'clock shut off on generators but I have run these all night and not got in trouble. In fact I put these units under the front of my fifth wheel and when the air is running the air conditioner is louder then the generators. Plus they are small, maybe 9"wide, 12" long and maybe 12" tall. (going off of memory on that)

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