PARALLELING HONDA EU6500s & EU7000s for 100A/120A OUTPUT in our HD P&P Pkg Learn how to get with Massachusetts Tax Credits of our work on recent FEATURE PRODUCTIONS like the Tony & Ridley Scott
Now Available Discounted 1Ton Van & Truck Packages include: The New Drop Ceiling Hanger our RENTAL CATALOG or QUOTE FORM click here. Service 
feature electrical packages for 100A or 120A Output
We have developed a new HD PlugnPlay Pkg. that enables the
paralleling of either two Honda EU6500 or EU 7000 inverter generators to generate an
unprecedented 100 or 120 Amps of power from portable generators. A complete
system consists of two generators, a Paralleling Control
Box, and one of our Transformer/Distros (either 60, 84, or 100 Amps.)
To provide power that is readily accessible, our 100A Paralleling Control
Box is outfitted with a "Hollywood Style" 240V Twistlock receptacle. The "Hollywood Style" Twistlock
receptacle is there to supply power to either our 60, 84, or 100 Amp
Transformer/Distro. The addition of a Paralleling Siamese with a 240V Bates pocket will enable you to power large
HMIs that operate at 240V (4k  9k ARRIMAXs) as well as 120V loads on the Transformer/Distro. To power 12kw HMIs
requires modification to the generators (both EU6500s and EU7000s) and our 120A Paralleling Control Box (see picture below.)
The Transformer/Distro serves several important
functions in this system that enables two generators to be paralleled (see
below for details), but its' primary function is to stepdown the
combined 240V output of the two generators into a single large 120V
circuit (either 60, 84, or 100 Amps) that is capable of powering more small
lights or larger 120V lights (up to 10k Quartz) than has ever been
possible before on the super quiet Honda EU generators.
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 BreakOut boxes to distribute power
around your set, breaking out to UGround Edison Outlets where ever
needed.
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 our Transformer/Distro,
the one that makes it possible to parallel two EU6500s and EU7000s in the first
place, is that it isolates the generators from high neutral return
currents that can lead to dangerous neutral “crosscurrent”
between the two generators (see below for more details.) For sales or rental information contact rentals@screenlightandgrip.com
__________________________________________________________________ Each component of our "HD Plug & Play Package" is available for Rental or
Sale
Mole Richardson, K5600, Power to Light, Kino Flo, and Honda.
These technological advances in lighting design now enable the use of bigger lights, or more smaller lights, off of standard wall outlets or off a new generation of quieter and more powerfull Honda Inverter Generators. Click here for detailed information on our HD P&P Pkg. __________________________________________________________________ Time to put our Geek Hats on: The following is a brief explanation of the importance of our
Transformer/Distro in the successful paralleling of two Honda EU6500s and EU7000s.
If some of these concepts are foreign to you, we suggest you first read
our technical “White Paper” on the use of "Portable Generators in Motion Picture Production"
that is cited in the 4th
Edition of Harry Box's "Set Lighting Technician's Handbook" and then read an
informative article by Gary Olson, Technical Support for Cummins Power,
on “Paralleling Dissimilar Generators.”
on portable generators than has ever been possible before." Harry Box The voltage waveform shape created by a generator is affected by its'
load. The resulting waveform may be described in terms of its
fundamental frequency and voltage magnitude and the magnitude of the
harmonic voltages and their frequencies that make it up. This harmonic
voltage distortion, while small in the case of inverter generators, may
still be significant, particularly in paralleling applications.
The illustration above shows the relationship of firstorder
(fundamental frequency waveform) to third and fifthorder harmonic
waveforms of the resulting waveform. The harmonic voltages are
effectively added to the fundamental waveform, resulting in the pure
sinusoidal shape of the fundamental being somewhat distorted. For
example, the resultant voltage at time A in the illustration above will be
the sum of the blue (fifthorder), green (thirdorder), and red voltage
magnitudes. So, the instantaneous voltage at that instant in time would
be somewhat higher than the voltage of the fundamental.
In this illustration, two voltage waveforms of the same RMS value (the red and blue lines) are superimposed upon each
other. Note that even though these voltage waveforms have the exact same RMS magnitude (they would read the same on a true RMS meter),
at different points in time the blue voltage is higher than the red, and vice versa. Since there exists potential (voltage) between the two
machines at these points, when the machines are connected together on a common bus, current will flow between the machines
(cross current.) Note that because the blue and red voltage lines cross each
other three times in each half cycle, the cross current includes a 3rd harmonic component (this current is represented by the green line.)
And, because the neutral systems of the two machines are tied together into a common neutral bus, this cross current will circulate (as illustrated below)
between the two generators continuously.
Cross current can become a problem if we add to it the triplen harmonics dumped into the neutral by nonlinear loads such as nonpower factor corrected HMIs, Kinos, & LEDs. Because these harmonic currents (the triplens and the 3rd harmonic of the cross current) are in phase with one another they do not cancel in the neutral as fundamentals do, but instead build one on the other to create elevated cross current with a large 3rd harmonic that circulates continuously on the neutral conductors. And, because the elevated 3rd harmonic crosscurrent is at a higher frequency (180Hz) it generates heat exponentially (use this link for details.), resulting in the overheating of the conductors and the generator's inverters. Since the harmonic content of a generator waveform varies with the load, the negative effects of operating with dissimilar voltage waveforms will be most apparent at rated load because that is the point at which the rise in internal temperature created by elevated cross currents will typically be highest and the generator's inverters most susceptible to failure.
One way to avoid the problems associated with 3rd harmonic currents continuously circulating on the neutral
is to simply drop the neutral connection between the load and the generators. For this reason, we have designed the electrical distribution
of our paralleling setup to include a 240Vto120V stepdown Transformer/Distro to serve 120V loads (rather than a "Splitter Box.") Since
there is no electrical connection between the primary and secondary of a transformer, our Transformer/Distro
interrupts the path on which the most disruptive current can flow in a paralleling set up (the load 3rd harmonic.) Again, load 3rd harmonics
(those generated by nonpower factor corrected loads like HMIs, Kinos, & LEDs) are problematic because they will not cancel with the cross current 3rd
harmonic generated by paralleling two generators. The net result can be severely elevated cross current circulating between the two generators leading to
their inverters overheating.
In our system, large HMIs operate singlephase at 240V on the 250V Bates
receptacle on the control box and hence return no harmonic currents to
circulate as cross current. But, what about smaller HMIs, Kinos, and
Quartz lights that operate at 120V and require a neutral? That's where
our Transformer/Distros play an important role. Their Single Phase stepdown
configuration both creates the required neutral connection for smaller
120V loads, and at the same time (as illustrated below) isolate the generators from the 3rd
harmonics created by these loads that would otherwise lead to elevated
cross current.
The harmonic currents generated by small HMIs, Kinos,
& LEDs will cause heating in the primary of our Transformer/Distro
(it can take it  it's built for it), but the disruptive effect of
their flow in the system neutral of the paralleled generators is
eliminated so the generator inverters remain cool. By eliminating a neutral
connection between the genset bus and the loads, a Transformer/Distro eliminates
the reason (harmonic problems) that prevented the successful parallel operation
of EU6500s before  making it now possible to operate more
lights, or larger lights, on portable Hondas than has ever been
possible before (use this link for a more detailed explanation.). 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 PlugnPlay Pkg. Use this link for
sales information on our HD PlugnPlay Pkg. or contact rentals@screenlightandgrip.com.
