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Old 06-30-2020, 08:36 PM   #1
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12,500 watt genset.

Wife and i are looking for a used higher end coach.
weve been looking at essex,foretravel,zephyr,
most of these have bigger gensets.
Seems to me A Zephyr would not need more
power than an Allegro bus similary equipped.
To run 3 acs and whatever else. Is it just "fluff'
for the money or is there a real need in lets say an essex that the smaller genset in say a dutchstar wouldnt cover??
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Old 06-30-2020, 09:16 PM   #2
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I have an 8000w gen, my ACs uses 11amp each 33amps, which is <4000w, microwave 1500w, water heater(if switched to electric) 1000w, battery charger (only when 800ah bank batteries are real low) 1800w.

Ive NEVER completely maxed out my generator, but I guess if everything there was running it would shed my water heater, if battery bank was empty AND water wasn't hot.
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Old 07-01-2020, 03:33 AM   #3
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so if all that was runnining at once and you turned on the hairdryer what happens..looks like
your at 8300 watts with what you mentioned.above
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Old 07-01-2020, 03:37 AM   #4
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The larger generator will run at a lower percent of capacity than the smaller one. This may result in a longer life span if all things (maintenance) are equal. Whether this is worth the extra money is a question only you can answer.
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Old 07-01-2020, 04:41 AM   #5
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I have a 12.5 Kw and can easily exceed 50 amps on each side if we don't watch the load. The manufacturer had a good reason to install that size. If you look at a coach with a smaller generator it will not have some of the accessories. In the case of my Monaco Signature, add up the amperage for 3 A/C's, AquaHot 600 with two 2,000 watt elements, microwave, 240 VAC Dryer, washing machine, InstaHot water heater for tea, hair dryer etc.. We have to watch the load and start load shedding frequently. Move into a Foretravel with a 4th A/C and other conveniences and you will see why they have a 20 Kw generator. They can also have a "buddy receptacle" for someone to plug into their generator.

The Zephyr is nice, I don't see it in the same class as a Foretravel.
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Old 07-01-2020, 04:43 AM   #6
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The generator might be sized to support the inrush current from all three ACs starting at the same time. Not when you turn them on, but because the compressors won't cycle on and off at the same rate, and sometimes things happen "just right" to create a big spike in the load.
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Old 07-01-2020, 04:53 AM   #7
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Some of the newer coaches being build with the smaller gensets are using the inverter/batteries to help augment the power supply. When there is a temporary need, the system can use the inverter to take up the slack, and when the extra load is removed the batteries are recharged.
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Old 07-01-2020, 09:33 AM   #8
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Quote:
Seems to me A Zephyr would not need more
power than an Allegro bus similary equipped.
To run 3 acs and whatever else. Is it just "fluff'
for the money or is there a real need in lets say an essex that the smaller genset in say a dutchstar wouldnt cover??

In a coach with 3 a/c and the other stuff that is typical on a high end model, a 7500-8000 watt genset is only marginally adequate. Even with two a/c it's possible to hit about 40A per leg and an Onan 7500 maxes out at 35 amps/leg. Therefore the top-of-the-line models are often equipped with the larger (more expensive) 10,000 or 12,000 watt generators. It's the difference between "over-the-top" and "barely adequate". Not much different than offering a larger engine or a bigger inverter on those same models. If you can afford more, you get more capacity to help avoid any possible disappointments.
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Old 07-01-2020, 09:42 AM   #9
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Another thing to consider is the 12,500kw (and larger) generators are actually capable of producing 240V single-phase power, not to be confused with 50A 120/240V service in most RVs.

Many of the higher-end coaches have 240V Dryers and potentially other appliances that can run more efficiently on 240V.......might not automatically mean there are 240V appliances in these upper-end coaches, but the 12.500 or larger generators will provide this capability if needed in the future
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Old 07-01-2020, 10:03 AM   #10
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Another thing to consider is the 12,500kw (and larger) generators are actually capable of producing 240V single-phase power, not to be confused with 50A 120/240V service in most RVs.

Many of the higher-end coaches have 240V Dryers and potentially other appliances that can run more efficiently on 240V.......might not automatically mean there are 240V appliances in these upper-end coaches, but the 12.500 or larger generators will provide this capability if needed in the future
Huuu ? Maybe if its European.

120/240 volts is single phase power.

Here in America 120/240 volts is the standard and the generator will supply it.

Othewise how will it support all of the 120 volt items ?
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Old 07-01-2020, 10:15 AM   #11
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Huuu ? Maybe if its European.

120/240 volts is single phase power.

Here in America 120/240 volts is the standard and the generator will supply it.

Othewise how will it support all of the 120 volt items ?
Of the Onan line only the 10 and 12.5 K will provide 240 volts for the dryer or electric cooktop. Onan does make some smaller commercial gen sets that produce 240 but they aren't for RV use.
My rig uses 240 for the dryer and yes it is possible to draw more than 50 amps on each leg.
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Old 07-01-2020, 04:45 PM   #12
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Huuu ? Maybe if its European.

120/240 volts is single phase power.

Here in America 120/240 volts is the standard and the generator will supply it.

Othewise how will it support all of the 120 volt items ?
You might wanna read-up on that ....2 120V lines do NOT make single phase 240 unless wired properly
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Old 07-01-2020, 04:58 PM   #13
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You might wanna read-up on that ....2 120V lines do NOT make single phase 240 unless wired properly
Roll eyes ?

You said,

" Another thing to consider is the 12,500kw (and larger) generators are actually capable of producing 240V single-phase power, "

??? " not to be confused with 50A 120/240V service in most RVs " ???. "

What does that mean or have to do with smaller generators with 2- 120 volt outputs ?
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Old 07-01-2020, 05:14 PM   #14
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Roll eyes ?

You said,

" Another thing to consider is the 12,500kw (and larger) generators are actually capable of producing 240V single-phase power, "

??? " not to be confused with 50A 120/240V service in most RVs " ???. "

What does that mean or have to do with smaller generators with 2- 120-volt outputs?
Actually a 7500W generator only has a SINGLE 120V output (like a 30A shore connection) and it splits the SINGLE 120V leg into 2 output legs to power both sides of your panel as though you had 2 but the differences is that they will not be 180* out of phase as is needed for 240V single phase.

If you try to run a 240V single phase device without a phase converter it will not work which is why I was talking about the larger generators that DO put out (2) 120V lines that ARE 180* out of phase.

As I said you may want to do some more reading as your misunderstanding is very common......Peace!
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