Will cost you more than a 25 kW solar/ grid tie array from a reputable supplier. If your that cheap and can't afford to go the right route for grid/tie just stay on the grid and pay ya carbon tax when its due.i want to build my own & have it approved
I suspect you have no idea how much it might cost to get such a device approved, you would probably have to manufacture multiples of them, send them away to be tested (some probably to destruction), along with a LARGE cheque.No problems selling power to the grid in Australia, it's already organised, i want to build my own & have it approved.
Thats about 11.5 years to get to the point of making a profit on investmentConsidering how unlikely finding schematics for the inverter are and the cost of designing it yourself 10k for a 10kw unit doesn't seem unreasonable.
Assuming your 10kw generator is generating the full 10kw 100% of the time you'll earn $876.6 per year before taxes.
Try eBay maybe they sell used inverters.
1. the link is an inverter for a fuel cell, not a grid tie inverter.Here is a link that might be relevant (10 kWh inverter):
I find it sad how many were so quick to jump on this guy with their 'expert opinions' on safety/practicality and ROI - based on assumptions.
Truely helpfull posters would have:
asked leading questions (kWh's; safety awareness) first
provided safety/cost warnings presented informatively/nicely
checked their math - $.1x10x24x365 = $8760 not $876.6
checked other people's math before extrapolating
This guy sounds like a do-er - and I suspect he has already done what he set out to do, despite the arogant/biased and self-grandizing responses he got here.
A standalone inverter is a constant voltage source. A grid-tie inverter is a constant current source. Just being in sync with the mains is not good enough, if the inverter is configured as a constant voltage source it will either overheat or shutdown.I've tried modifying a 150w inverter (stand alone one). The main problem is to make it synchronise with the grid and disconnect when no grid is available. I used an inverter that contained two 494 PWM chips, basically one is used to control the conversion from 12v DC into 360v DC, then the second generates a modified sinewave (which isn't ideal) at 50Hz. I added a 50Hz ish sinewave into the CT pin and observed the output waveform. the output frequency changed with the over riding sinewave so ion theory it works. But when I connected a step-down transformer to the CT pin, it went up in smoke.
I don't think your power company would like that.I've so far got through 3 different inverters and two 1400VA UPSs trying to learn what's going wrong.
The other problem with using the modified sine inverter is the harmonics that are introduced onto the grid, I don't think is such a big problem at such a small scale but could interfere with other equipment connected to the grid.
True it needs to be approved which is beyond the scope of a hobbyist.As said in message #2, it's not the sort of thing you would build yourself. It's got to be power company approved too.