Re: Power generation system. Part 2

some of them you wont find in commercial UPS either :) Yet...

yep.

ROTFLMAO! nicely put. Say Pcont = 3kW.

Cheers
Terry

Most of those are features I am used to seeing in a commercial (i.e. not
domestic) UPS.

However review for a moment your 3:1 peak:average capability.  Peak is
determined largely by current handling in the semis.  Average is more determined
by thermal factors.

I can turn a 2:1 into a 3:1 very cheaply - by removing part of the heatsink.
One needs to be rather careful specifying such a ratio unless the average power
output capability is also defined adequately.

What features would you look for in a "pure" sinewave inverter? what
features would you like?

Here's what I think:

- true sinewave (even at no load)
- line interactive
- fully regenerative (eats motor loads etc)
- low (ideally no) EMI. Run an AM radio sitting on top of it...
- doesnt care which wires go to the grid, which to the load
(alas, it does care about which go to the battery)
- IP66/IP68 (run the sucker underwater...)
- drop it from 1m and give it a good boot while its running (wont die)
- programmable input PF -1...+1 (IOW can do VAR compensation)
- input can act as harmonic filter
- failsafe (fully fused, thermal modelling/monitoring etc)
- no inrush current
- sub-cycle brownout/dropout detection - bumpless power transfer
- optically isolated comms link
- user serviceable cooling fan
- liquid cooling option
- 3:1 peak to average power ratio
- > 20kHz switching frequency (inaudible)
- single- & three-phase models
- wide range of battery voltages (12-24-48V)
- built-in battery condition monitoring
- simple yet useful user interface (small LCD, a few buttons)
- optional bypass contactor

Cheers
Terry

If you want a quiet RF environment, some "pure" sinewave inverters put
out a bit of RF. Mine (SEA Voyager) puts an S5 signal on some of the
amateur bands. Can be suppressed of course - but that's more work.
It is very efficient though - even at low levels  (<50W).
Alan

**I have yet to determine that. If anyone has a suggestion, I would be all
ears. Here is my source:

http://www.quirks.com.au/

Just wondering mate, what brand of inverter are you thining of going for?

**What about consumables?

**Perhaps. However, I am searching for a practical, reasonably priced,
doable (right now) technology.

What about hydrogen fuel cells?

Last forever, no batteries required.

The way of the future.

After some investigation, I've decided to CONSIDER a completely different
approach to a petrol, or diesel generator. I can buy a 3kVA inverter for
about $3k and some Solar cells (10 X 115Watt panels) for another $8k. The
gummint gives me back $4k (yay!). I have plenty of easily accessible (<2
Metres from ground level), flat, unshaded roof space for the panels. I can
buy a second hand, refurbished, 24V 1kA/Hr battery for another $2k.Not only
should I be able to generate all the power I require, but, for a few extra
Bucks, I can feed the surplus back into the mains and make a little profit
(double YAY!). No neighbour problems and get to have a warm, fuzzy, green
feeling. A win all 'round.

Any thoughts and suggestions will be appreciated.