Electrical management system
Total newbie here with a 2016 Jayco Greyhawk. We intend to do a lot of cross country travel staying at various campgrounds. Do I need an EMS?. Wanting to be able to use this motor home a lot for the...
Forum Discussion
Energery Management System has two meansing.. One is the Progressive Industries EMS units, which have been covered above.. The only comment I will make is the delay control, 15 seconds by default, but you can make it 136.... Make it 136
The reason: Air Conditioners and resendital fridges and Ice Makers (the stand alone type) have compressors, when these shut off for any reason, they need to stay off for at least 180 seconds if possible or as close to it as possible.
You get a one second power fail (happens a lot) Everybody's comompressor stops, Power is restored, Now all the compressors are trying to re-start, with a full head of pressure,, You are looking at a "locked rotor" current draw (Many amps) voltage drops current flows BIG time, Finally the circuit breakers (Thermal) in the motors trip, now that flowing current HAMMERS into the lines,,, Voltage spikes big time.. (During this your 136 second delay has you "off line" and thus protected) now first the locked rotor start damaged every compressor (Save yours) and the voltage spike is no fun for any of your electronics.
Finally after 2 or 3 tries (usually around 90 seconds total) things settle down, Just to be safe you wait another 46 seconds. and your compressor starts with very little, if any, head pressure left.. Mine (At 172) has even less. But I still recommend the PI unit over what I have.
The other EMS, (Intelletec is such a device) is designed to help insure you only hit 29 amps on a 30 amp site... YOu do NOT need that one.. It is a convience only.. But you DO need the PI one.
Saved me a lot of headache here cause we have had several of those 1 second failures and a couple of major ones (hours) and again when things come back on line, even if it's been hours... There is a bit of a rollar coaster ride on voltage for the first 60 seconds or so,.
The reason: Air Conditioners and resendital fridges and Ice Makers (the stand alone type) have compressors, when these shut off for any reason, they need to stay off for at least 180 seconds if possible or as close to it as possible.
You get a one second power fail (happens a lot) Everybody's comompressor stops, Power is restored, Now all the compressors are trying to re-start, with a full head of pressure,, You are looking at a "locked rotor" current draw (Many amps) voltage drops current flows BIG time, Finally the circuit breakers (Thermal) in the motors trip, now that flowing current HAMMERS into the lines,,, Voltage spikes big time.. (During this your 136 second delay has you "off line" and thus protected) now first the locked rotor start damaged every compressor (Save yours) and the voltage spike is no fun for any of your electronics.
Finally after 2 or 3 tries (usually around 90 seconds total) things settle down, Just to be safe you wait another 46 seconds. and your compressor starts with very little, if any, head pressure left.. Mine (At 172) has even less. But I still recommend the PI unit over what I have.
The other EMS, (Intelletec is such a device) is designed to help insure you only hit 29 amps on a 30 amp site... YOu do NOT need that one.. It is a convience only.. But you DO need the PI one.
Saved me a lot of headache here cause we have had several of those 1 second failures and a couple of major ones (hours) and again when things come back on line, even if it's been hours... There is a bit of a rollar coaster ride on voltage for the first 60 seconds or so,.
