Question about Inverter Electronics - Others
This inverter is not working correctly. It is generating AC voltage but the voltage is low. I need a circuit diagram to diagnose the problem. The inverter is from China. There is no other identification information on the unit.
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Posted on Jan 02, 2017
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Posted on Nov 01, 2009
I'm sorry that I can't help you, but if you're in a hurry, you can visit the Magnum website at: http://www.magnumenergy.com/Service/Servicefront.htm and try to find your model's online manual and search troubleshooting advice or you can email customer service at
firstname.lastname@example.org and they should at least be able to lead you in the right direction.
A few questions: Does this problem remain even when there is at least a 10+ watt load on your system? is your Magnum in a hot environment? Does your inverter feel extraordinaryily hot? Have your batteries outlived their lives? Have you cleaned all the connections? Even if they 'look' like they don't need it?
All the best to you.
Posted on Sep 11, 2011
SOURCE: user's manual pure sine inverter
May or may not be identical to what your part number is but the general guidelines are the same.
If you are looking for the schematic, the manufacturers keep a tight lid on those to protect intellectual property as there are several ways to achieve the sinewave synthesis, and some are under patent or are under license.
If you understand the principles of a Class A audio amplifier, you should be able troubleshoot this type of inverter.
Posted on Jan 16, 2012
Most likely your problem is in the battery type. You state that you have 2 240Ah batteries. I suspect these are deep discharge batteries which are designed to deliver low power over a long period of time. Typically the AmpHour (Ah) rating, for these type of batteries is stated at a 20 hour discharge rate. This would be a maximum of 10 amps per hour for 24 hours for the 240Ah batteries. However most batteries will only allow for a 75% efficiency so the actual delivered amperage will be about 7.5 amps per hour for 24 hours.
The wattage delivered at 7.5 dc amps at 12 v equals 90 watts. The inverter will deliver about 85% (efficiency of inverter) of this to the AC plug for about 75 watts. This is the optimum sustained load the battery will deliver for the stated 240 Ah capacity. Normally you would not drain the battery to this level. Typically battery manufacturers recommend not drawing the battery below 50% of its rated AmpHr capacity for maximum life.
As you begin to exceed the optimal wattage, particularly in a deep discharge battery, the efficiency of the battery drops, additional heat is generated, and voltage of the battery begins to drop. The higher the load the faster this occurs. I would expect in your situation (1800 watts 2-240Ah deep discharge batteries) to begin to get a low voltage alarm (about 11.5 volts) in less than a minute. You can verify this if your batteries are connected to an automotive alternator, as these can deliver high amperage as long as the engine runs. My RV has a 200 amp alternator, and when running will power 1500 watts through my alternator with no problem. Without the alternator running my Cobra 1575 inverter will shut down in about 30 seconds. (I have 2 225Ah deep discharge batteries that are new.)
Posted on Jun 15, 2013
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