Homebrewed Electricity > Controls

inverter protection from surge back EMF etc

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rgormley:
Any idea on a way to protect an inverter from back emf`s surges etc etc
Ie: fluros flickering, motors in Fridges turning on/off
they would be making some nasty stuff going back to the inverter.

i would like to help protect by placing some surge dampening on the inverter output
woould a good quality surge/power board work?

TomW:
rgormley;
Funny, never saw anyone claim this to be a problem until this post?
My thought is you are over thinking things. Seeing problems where none exist, etc.
I could be wrong but it just doesn't seem like it would be a problem in quality equipment. And, if it is a problem in cheap equipment the fix is probably simply buy good gear.
Maybe you have a link to information about this?
Always curious about new information.
Cheers.
TomW

veewee77:
My guess, and this is strictly a guess, mind you, is that the manufacturer would have taken that into account when they produced the inverter. With any kind of quality inverter, you'll likely see that they are pretty well protected from that right out of the box.
Now, if you get an inverter made by Ralph's Inverters, you might have a problem.  
Doug

boB:


A good inverter will be able to sink reactive power as well as source it.

This is why, for instance, a modified square wave inverter has that flat

spot at zero volts in its PWM duty cycle.  It's basically a short circuit

at that time to the AC output.
In a sinewave inverter, the output impedance ~should be~ low for either the

goes-inta' or the goes-outa direction of current.
If an inverter is making AC and gets connected to another AC source, like

the grid or a generator, then it's called "backfeed", which is sometimes

hard to protect from, but again, a good inverter will have "backfeed protection"

and shut off when it sees high current at the wrong time in the AC cycle.
Spikes can be helped by different methods like MOVs and stuff, if that's what

you're talking about.
boB

rgormley:
err maybee the cheap ass factor here...
the inverter i have bought is a new 24vdc 3kw cont rated  (6kw surge) for only $400 AU. so maybe a elcheapo!
yes maybee i`m looking for problems that simply is not there.
(i have a 12volt 3kw cont rated inverter) and it has ben happy for 3 year running 24/7 onthe fridge-freezer  / fluro lights /PC`s etc)
so yes maybe it`s in my mind
MOV`s yes thought about them acroos the AC but dont they go short cct if overvoltaged (ie spike was absorbed by them?)
dont fluro ballasts produce evil back emf when the balast collaspes?
or should i take a chill pill...

Cheers...Richard

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