Perhaps the GT235E had a larger alternator and a 1000 watt inverter. You could put an inverter on any mower but would quickly drain the battery without a larger inverter. My LX279 alternator puts out 13 amps. Any load over about 150 watts on the alternator would be draining the battery. You would need around a 80 amp alternator to be be handle 1000 watts of 110 assuming you used a very efficient inverter.