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Old 10-10-2015, 05:35 PM   #1
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Location: South Western Michigan
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Automatic Energy Select switch

Can anyone tell me what the Automatic Energy Select Switch does on my 2015 Rockwood model 8289WS 5th wheel?
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Old 03-13-2016, 09:03 PM   #2
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Seems like Charlie never got an answer to his question, but I'd like to ask it again. There is black box in the electrical space behind the power panel. it's called an "Automatic Energy Select Switch":

Intellitec’s Automatic Energy Select Switch (AESS) is
designed to be used in RVs to share the power available
from a single circuit breaker between two large loads. The
AESS applies power to both appliances until the primary load
is turned on. It then removes power from the secondary load
to prevent the circuit breaker from being overloaded. This
function is particularly useful for sharing power between the
microwave oven and another “sheddable” or postpone-able
appliance, such as the washer/dryer, or water heater.
Typically, this function has performed with selector switches,
forcing the owner to manually switch between the two
appliances.
The selecting function is particularly useful when the
microwave oven is the principal load. Power is always
available to it, assuring that the customer can use the
microwave whenever required and it’s internal clock remains
operating. While the microwave is in use, the function of the
secondary load is postponed until the microwave is finished.

I get all that, but how does FR actually use it? Is it mentioned in the manual or the literature somewhere?
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Old 03-14-2016, 08:42 AM   #3
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Quote:
Originally Posted by Charlie.Reynolds View Post
Can anyone tell me what the Automatic Energy Select Switch does on my 2015 Rockwood model 8289WS 5th wheel?
Oh the things you find when trying to answer questions on this board!!!

It seems that the electrical code for "recreational vehicles" states that if you have 30 amp service, you cannot have more than 5 circuits in your panel and you cannot connect more than two "thermostatically controlled loads." Such loads would include the water heater, the air conditioning, and electric fireplace. I don't think the furnace counts since it is not a 120 volt unit. Don't know about the reefer either. If they install a "load shedding device" like the AESS, they can have more of these loads and more than 5 breakers on a 30 amp shore power system.

What is does is sense if the primary load is using significant current, and switches off the secondary to keep from overloading the single breaker. So when you turn on the microwave, it will drop the electric hot water heater and 45 seconds after the microwave goes off, the hot water heater goes back on! In general you would never know it is happening, but it keeps from overloading the 30 amp power feed. There is no reason to have such a device in a 50 amp power panel and shore power arrangement, so you probably have one if you have a 30 amp connection.

If you are a masochist, you can read for yourself at Page 70-479 Look at section "C".
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Old 03-14-2016, 11:16 AM   #4
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Scott,


Thanks for going the extra mile on this one. The part about the code is the critical thing, as is the reasoning behind the use of the device. I count 6 breakers plus the main in my converter panel (pic in my album).
The reefer is a thermostatically controlled device, at least to my way of thinking, so it could be involved too.
Seems like FR might want to mention that the device is used, especially if it's the water Heater, on electric only, that is being turned off in the morning when the microwave is going and there is no hot water...


(I just read the code over again (I'm not a masochist, I'm a quality engineer!)and I don't think a microwave fits the definition unless it's a combined convection type. A standard microwave is a time and power device without a thermostat, so, in my trailer at least, I have the fireplace, the HWH, AC and the reefer. It would be nice to know what is controlled, but at the moment, I don't really want to dig through the spaghetti to track it down!)


Cheers
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Old 03-14-2016, 12:46 PM   #5
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Quote:
Originally Posted by ChateauV10 View Post
Scott...
The code really doesn't say what has to be on the device. I would bet that the microwave is the priority device and it sheds the hot water heater, but only when it is actually heating. 45 seconds after it stops heating, the hot water heater will be back on. Not a bad deal unless you use the microwave for cooking something that takes hours.

The documentation is a little misleading. I am sure that if we dig, the load will be shed only when the priority device draws "significant current." Otherwise the clock in the microwave would stop when the hot water heater comes back online. There is a current sensor on the priority feed, not a simple switch and, of course, if they were to totally cut off the priority device when the hot water heater came back on line, you couldn't turn the microwave back on at all!!!

Not a bad design...
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