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Small grid-tie inverters? - Page 3

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Posted by Eeyore on June 20, 2008, 11:16 am

Maury Markowitz wrote:

Dare one ask why ?


Posted by BobG on June 20, 2008, 12:25 pm
I think there is a market for a small grid tie inverter.... lots of
Florida guys like me got real tired of getting up every two hours to
put another gallon of gas in the generator back during the '04
hurricanes. I have a small pv system with some panels, a
SolarConverters MPPT charge controller, a couple of T105s and an
inverter that will run the fridge and the tv, etc. There it sits
waiting for the next hurricane. A 250W system that would keep this rig
'exercised' while I'm at work would pay for itself in a couple of
years. I've been ruminating on how to make one... I think driving the
12v secondary of a 250 watt transformer with a varaiable ampl and freq
pwmmed sine wave might work. Cant quite dial in on how to stay in sync
though... ideas?

Posted by Mauried on June 20, 2008, 12:36 pm

You cant make a grid Tie Inverter, at least not one that any electric
supply utility will approve, and without approval, you cant connect it
to the mains.
A lot of the costs in grid Tie Inverters is the accreditation and
safety checks needed before power utilites will allow their use.
A Grid Tie Inverter wont help at all during power blackouts.

Posted by BobG on June 20, 2008, 3:01 pm
 On Jun 20, 8:36am, maur...@tpg.com.au (Mauried) wrote:

Oh Poo. Its 250 watts fer gods sake. Its just a little trickle. No one
will know its there. No need to ask for approval. Its easy to tell
when the rest of the world turns off... the output current limits on
the next cycle. Its the 'normal' case thats sort of hard to

Posted by z on June 20, 2008, 4:17 pm

Yeah no one will know its there until the utility company needs to do work
on a line and shuts it off -- and your 250 watts is still flowing making
the line hot when they work on it.

Then you've got some pissed off utility guys.

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