alt.energy.homepower

"Ulysses" wrote in message
news:13djn2l4u4t6p44@ ...
|
| "Sudy Nim" wrote in message
| news: $ @ ...
| > Is it possible to run two portable generators in parallel?
| >
| >
|
| Aside from buy two new inverter generators designed to be paralleled I've
| read (in this NG) in the past about using a 100 watt light bulb to somehow
| synchronize the waveforms. From what I've read it's tricky but can be
done,
| at least sometimes. I imagine the frequency needs to be very close on
both
| gennies. Perhaps some googling might turn up some old posts on the
subject.

The process is very simple.

The bulb is wired to the hot line of both gen sets. The speed and voltage
are adjusted so the bulb is effectively 'off'.

When the genset are more then 20 Hz off the bulb is constant on, as the
frequency approaches a match the bulb flickers until full frequency and
phase is in sync. At full voltage and freq sync the bulb is off.

To my personal knowledge (goes back 50+ years) this process was and may
still be used in marine applications when hot transferring loads from a
running genset to another gen set when the first is to be shut down for what
ever reason.

I've also observed (but have zero personal experience other than watching
the deed be done) the process used to sync gen sets that had the ability to
self maintain sync over narrow ranges once set up.