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I have developed a new HD Plug-n-Play Pkg. that enables the paralleling of two Honda EU6500 inverter generators to generate 100 Amps of power. A complete system consists of two modified Honda EU6500s, a Paralleling Control Box, and one of our Transformer/Distros (either 60- or 84- Amp.) Parallel operation of two Honda EU6500 generators made possible by our new Paralleling Control Box) The generators require modification to interface with our standard Paralleling Control Box, which syncs the frequency and equalizes the load between the generators. Our proprietary paralleling control circuitry uses the Pulse Width Modulation (PWM) of the generator's inverters to control the load sharing. The phase angles of the two generators are synchronized using open loop architecture. The final function of our control box is to switch the outputs of the inverters to a common bus after their frequencies are locked in step (same phase angle and time base.) 
(As demonstrated here, our new HD Plug-n-Play Paralleling System can power a 6K HMI as well as 2-2k and 2-1k Fresnels) To provide power that is readily accessible in industry standard outlets, our Paralleling Control Box is outfitted with both a 240V Bates receptacle, as well as a "Hollywood Style" 240V Twist-lock receptacle. The 240V Bates pocket is there to power larger HMIs than has ever been possible before on Hondas (4k - 9k ARRIMAXs.) The "Hollywood Style" 240V Twist-lock receptacle is there to supply power to either our 60- or 84- Amp Transformer/Distro. The Transformer/Distro serves several important functions in this system that enables two EU6500s to be paralleled (use this link for details), but its' primary function is to step-down the combined 240V output of the two generators into a single large 120V circuit (either 60- or 84- Amps) that is capable of powering more small lights, larger 120V lights (5-10k Quartz) than has ever been possible before on portable Hondas. Each of our Transformer/Distros is likewise outfitted with an industry standard 120V Bates receptacle so that you can use standard distro equipment, like Bates Siameses, Extensions, and Break-Out boxes to distribute power around your set, breaking out to U-Ground Edison Outlets where ever needed. Our 60A Transformer/Distro provides 120V power to smaller lights while a 6K HMI operates at 240V) 
 An added benefit to using a Transformer/Distro to distribute the combined power of the two generators is that, no matter where you plug into the Transformer/Distro on its' secondary side, it automatically balances the load on the generator's two legs (which is critical for successful paralleling of two machines – use this link for details.) This feature also makes electrical distribution on set incredibly simple: you just plug in lights until one of the generator's load indicators reads 6000 Watts and the Transformer/Distro does the rest. But, the most important benefit to be gained by using a Transformer/Distro, the one that makes it possible to parallel two EU6500s in the first place, is that it isolates the generators from high neutral return currents that can lead to dangerous neutral “cross-current” between the two generators that can overheat their inverters (use this link for more details.) By reducing the dangerous neutral “cross-current” created by two generators operating in parallel, our Transformer/Distros make it possible to operate more lights, or larger lights, on portable Hondas than has ever been possible before. Given the high sensitivity of HD camera systems these days, just about all the light you will need to obtain good production values can now be operated on our new HD Plug-n-Play Pkg. (use this link for more details.) Contact me if you want to retro-fit your Honda EU6500 for parallel operation without modification. Guy Holt, Gaffer, ScreenLight & Grip, Lighting Rental & Sales in Boston