reverse phasing protection for mosfets in inverter circuits.

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i a novice in electronic and i'll appreciate if anyone can help me with the problem am facing with my diy inverter i built.my output mosfet short at times when i connect my transformer then i get 240volts at d transformer output at 13 volts but when i plug my t.v (79watts) d volt drops to 201volt with a bulb of 60watts it drops again to 180.am using 4 mosfet(irfp250) 2 in parallel.here is d diagram .i replaced d power transistor with mosfet irfp250,1ohm with 220 ohm and 100ohm with 2.2 k. https://www.edaboard.com/attachment.php?attachmentid=71034&d=1332065898
 

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Hi mossses,
You have to increase the number of output transistors (irfp250). Better you use STP75NF75, a better transistor with low RDS (on). Hopefully you will get the problem solved.
 

Have done dat already,am using 8 (irfp250) 4 in parallel on both side but still d same
 

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