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Open Roads Forum  >  Fifth-Wheels

 > Difference between Yamaha & Honda Inverters

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Greyhound RB

Michigan

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Posted: 02/13/20 12:09pm Link  |  Quote  |  Print  |  Notify Moderator

Quick question about engine displacement between the newer 2200 watt inverter generators. The Yamaha says 80cc and the Honda says 121cc. The Handa has 50 % more displacement than the Yamaha. If this is true, wouldn't the Yamaha have to run at a good bit higher rpm to put out the same power. If true I cant believe they would both last the same amount of engine hours. Any thoughts?

MFL

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Posted: 02/13/20 12:33pm Link  |  Quote  |  Print  |  Notify Moderator

JMO, but yes, makes sense to go with the bigger Honda engine for longevity, and useable power. Since the price difference is very little, a no brainer really! The Champ is an 80cc but a bargain in comparison, in case that may interest you.

Jerry





theoldwizard1

SE MI

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Posted: 02/13/20 12:47pm Link  |  Quote  |  Print  |  Notify Moderator

You are partially correct. For a given CONSTANT torque, to get for horsepower, you do have to increase the RPM. I am sure you know that many internal design factors affect the torque generated at a specific RPM so we are not exactly comparing apples to apples.

The other "confusion factor" is that both of these are inverter generators. Inverter generators start by producing a high voltage (around 200V), variable frequency (for AC power, frequency varies with engine speed), 3 phase AC current, typically using permanent magnets. (3 phase AC is much more efficient than single phase.) This is then converted to high voltage DC, filtered and then inverted to a constant voltage, constant frequency inverter circuit.

I suspect the engine size used on those two generators had more to do with what size internal parts (piston, rods, crankshaft, block, etc) both companies already had in production for other equipment. The difference could be from the strength of the magnets, efficiency of the electronics or the power of the engine.

The Yamaha 2400, 2800 and 3000 inverter generators all use a 171cc engine !

The Honda EB2800i uses a 186cc engine, but the EU3000i uses a 163cc engine !

laknox

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Posted: 02/13/20 01:06pm Link  |  Quote  |  Print  |  Notify Moderator

I still like Yamaha's Burst feature on their 3kw EB genny. Gives a "burst" of 500w pulled from the starting battery for about 10-15 seconds to help start A/Cs and other high load starting motors. I wish they'd do that on all electric start models. One thing to watch out for in their inverters though, is that the 4kw unit uses a CONSTANT SPEED engine. Runs at a constant 2600 RPM instead of adjusting speed for demand. All other of their inverter-generators are variable-speed, including the 6kw.

Lyle


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ScottG

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Posted: 02/13/20 02:56pm Link  |  Quote  |  Print  |  Notify Moderator

In real life use, the Honda has far better surge capacity. (Yes, We've tested it).
That being said, If I could get what I paid for my Honda, I would go out and buy a Yamaha ef2800i instead of the Honda's 2200 and have even better performance.


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Lwiddis

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Posted: 02/13/20 05:35pm Link  |  Quote  |  Print  |  Notify Moderator

X2, ScottG.


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philh

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Posted: 02/13/20 06:37pm Link  |  Quote  |  Print  |  Notify Moderator

get the lesser expensive unit and install an ez start on the aC

B.O. Plenty

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Posted: 02/13/20 09:57pm Link  |  Quote  |  Print  |  Notify Moderator

philh wrote:

get the lesser expensive unit and install an ez start on the aC
For what the EZ start costs you can buy a bigger generator
B.O.


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rbp111

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Posted: 02/14/20 08:42am Link  |  Quote  |  Print  |  Notify Moderator

I know that it is not the question, but I like the Honda over the Yamaha because the Honda uses a pump to move the gas. That is opposed to Yamaha which the gas can has to be higher to move the gas.

philh

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Posted: 02/14/20 09:09am Link  |  Quote  |  Print  |  Notify Moderator

bigger generator cost more to operate, and are heavier.

Compared to a small honda, which may or may not have enough umph to start a 15k Btu AC, it's still cheaper. Plus the added advantage of being able to run on 15a A/C line, and charge the battery.

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