I have two generators rated at 5 KW each. I know how to phase and put the
two in parallel while they are both running. The question is will they stay
in sync and put out 10 kw if needed ?
I know the Honda generators have a parallel cord, but think that is for the
inverter type. The ones I have are made by two differant companies and just
the inexpensive kind that sell for around $ 600 to $ 800 at most stores.
How are you going to get them in phase and stay in phase?
It is easy to get them in phase and running together. I have done that many
times at work with 3 phase motor generator sets with 50 horsepower or so
setups. We have varitable speed equipment that can not be stopped and to
work on the motor generator sets we parallel a spare set long enough to take
the running set off line. Simplest way is to hook up a voltmeter between
them and when the meter goes to zero you throw the switch to put them in
parallel. In simple terms the generators become electric motors and one
will try to drive the other to the same speed after the electricl
connection is made.
My question is really has anyone done this and will it work with the simple
I understand how you intend to MEASURE the phase with a voltmeter, ok
1) how do you propose to vary the speed of a home generator to get it
in phase with another?
2) once in phase and you throw the switch to connect them and they
lock together, how do you control the throttle settings of both so
that they share the load instead of one driving the other...
each home generator has a crude speed control governor on the throttle
and if they are not set to ___exactly___ the same speed, the "faster
one" will take all the load and the "slower one" will be driven as a
motor like you described.... as another poster said, the whole system
will probably "hunt" like crazy...
it is an interesting problem but unless you re-design the throttle
governors I don't see how you can get this to work..
sounds like a fun thing to try though...
The getting them paralled is no problem. They have adjustments for the
speed. Just not too user adjustable unless you know where and how.
The answer to your # 2 is sort of what I was looking for. They will try to
stay in sync for a while, but it may only be a few seconds, or they may stay
that way for a long time. I was trying to find out if anyone had ever tried
it and if it worked or not. I don't intend to sit and adjust the speed
after they are connected but want to rely on the governers to mantain the
I hate to blow about $ 1500 if they burn each other up just to be the first
one to try it....
Especially now that I just cleaned out the fuel system of one of them due to
not running it for a long time and leaving the old fuel in it.
I dont think you can do it safely knowing how the govenors are not
very good on 5000w gasolene units. Hondas EU have minimal V swing so
its a different animal. Maybe 1v vs 3-15 v swing from Honda EU to
regular cheap units.
Not that way but you CAN connect one generator to one leg of your 220
volt supply and the other one to the other side. Using 110 volts from
each generator for each half of the house and it should work fine.
Yes maybe if you are using only 110 Volt loads, (and ignoring the fact
that you can overlaod the neutral wires.) But I don't think that
will work at all if you have 220 Volt loads.
Have you actually done this?
That would not work for any 240V loads as the two sources would be
drifting in and out of phase and 240V devices would see wildly varying
Yes, it is possible to parallel generators and not just the inverter
based ones, it has been done daily since the beginning of electric
power. It has just been uncommon to parallel small generators.
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