Robert Bruninga via EV wrote:
No, just because it produces 60 Hz AC does not make it a Microinverter.
Anyone can make an inverter, They are dirt cheap from 1kw to 3 kW and only
cost about 15 cents a watt! You can buy a 2 kW "inverter" for not much
more than $300. But that does not make it a Grid-Tie microinverer.
A grid tie microinverter is a CURRENT SOURCE that pushes current against an
existing waveform It has to have an infinite load (the grid) or the
voltage will soar out of sight if the load goes down. That is what current
sources do. Fundamental EE.
Bob is right. People are being a bit loose with their definitions.
A "microinverter" is just a small inverter. There are zillions of these.
A normal inverter is one whose control circuits make it behave like a
voltage source. The inverter sets the output voltage and frequency at
(say 120vac 60hz). The load then draws whatever current it needs, from 0
to the max power the inverter can handle. The inverter does its best to
hold the voltage at 120vac while supplying that current.
A "grid tie" inverter is an inverter whose control circuits make it
behave like a current source. The *grid* sets the voltage and frequency;
the inverter just delivers its current. Without a grid, such an inverter
won't work.
The power section of an inverter is the same, regardless of what type it
is. The differences are in the control circuitry. Generally, the power
section costs all the money. The control circuitry is cheap in comparison.
Sure, one can design a box that can do both, But that is a complex
internal circuitry that does either one or the other, but they are totally
different circuits...
Well, nowdays it's just a one-chip microcomputer that costs a few
dollars; no matter what kind of inverter you're building.
--
In software development, there are two kinds of error: Conceptual
errors, implementation errors, and off-by-one errors. (anonymous)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
