-
Magnum Inverters – Won’t Run A/C’s
Moved from the Seminar thread.
3/14/2016 12:18:42 AM
peralko 
I noticed Magnum will be there for a presentation. I was told at Marathon GP that Magnum inverters does not support CruiseAirs–we ended up with a rebuilt Trace. According to Marathon, with the Magnum inverters, you won’t be able to run CruiseAirs without the generator or shore power.
Per & Margrit
2000 Marathon H3-45 #594
w/OTR AC
Previous coach ’95 CC Affinity
Member of the Prevost rescue squad
3/14/2016 7:25:42 AM
Jon
Why? Please explain why a Magnum of sufficient capacity will not run a Cruiseair? Does that mean it won’t run a roof air or a refrigerator or an aux compressor or a water pump? All have motors.
A lot of folks have swapped out modified sine wave inverters for pure sine wave inverters such as the Magnum because motor driven devices work better with them.
Jon and Di 2006 Liberty Elegant Lady 2005 H2 Hummer, 1950 Ford
Knoxville, TNOwner of three Liberty Coaches since 1990
3/14/2016 7:34:38 AM
Truk4u
That makes no sense unless the Magnum chosen doesn’t have the capacity of the Trace 4000.
Tom & Nancy
02 Marathon H, 732
08 Avalanche LTZ
3/14/2016 8:58:58 AM
Jeff
Magnum although a 4000 watt unit does not have the capacity for the surge that the trace units have….you have limited options if the the trace units are not repairable…There are a couple manufactures that can run the air conditioning units without stacking units. Might want to move this post to a new topic
Jeff Rowe
East Tennessee Luxury Coach
126 Horne Dr.
Vonore TN 37885
844-884-6036
© 2011 Prevost Community 
-
4 Replies
-
4000 watts is about 33 amps at 120 volts. I cannot recall seeing the starting current draw on my Cruiseairs approaching that. If they do it is a momentary response and I was of the opinion an inverter has the capacity to handle XX watts continuous and a greater value for surge.
What am I missing?
I am guessing the trace are not pure sine wave, or are they?
1999 XLV X-6872, liberty #440 -
Trace units use a step appoximation of a sine wave. If I remember right, they use variable steps between 33 and 52 to approximate a sine wave.
Marathon charged around $2100 for the rebuilt Trace, and they sent my unit out for reconditioning -
Since they are not pure sine wave inverters, if you upgrade anything with a motor, and I am thinking refrigerator as a good example you may have issues. Older devices were not as sensitive, but newer devices with motors and motor controllers might fail over time.
-
I replaced my heart freedom inverters with magnums and have had no issues.
Log in to reply.