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rolling my own
By rob7916, Section Newbies Posted on Tue Jun 17, 2008 at 03:17:15 AM MST
more newbie questions about pmg design and grid tied inverters

coils that is...
is it true that all commercially available grid tied inverters want high voltage dc, 90vdc for 110vac and 200+vdc for 240vac?
does anyone know the formula/rule of thumb for determining how many turns on a coil will produce X amount of voltage.
i kind of remember gauss, speed, turns on coil but this was 30 years ago... dam CRS Disease
know any good practical elec engineering books?
I.E.
if a 9 coil 100turns / 12 n42 magnet at 120 rpm produces 12vdc, does doubling the turns on the coil double the voltage? does 4 times the turns = 4 times the voltage?
newbie
rob

rolling my own | 3 comments (3 topical)

Re: rolling my own (3.00 / 0) (#1)
by Flux on Tue Jun 17, 2008 at 12:24:52 AM MST

"I.E.
if a 9 coil 100turns / 12 n42 magnet at 120 rpm produces 12vdc, does doubling the turns on the coil double the voltage? does 4 times the turns = 4 times the voltage?"

Yes if you look at open circuit volts.

"is it true that all commercially available grid tied inverters want high voltage dc, 90vdc for 110vac and 200+vdc for 240vac?"

Not true for all of them, but it makes sense. There are some about that accept lower voltage but they will be a combination of a conventional inverter and the bit that inverts back onto the grid and are likely more expensive. I think there are some that will accept a battery supply instead of inverting raw high volts dc back on to the grid.

Flux

Re: rolling my own (3.00 / 0) (#2)
by rob7916 on Tue Jun 17, 2008 at 11:39:09 AM MST

thanks Flux
i guess a call to a inverter dealer is on my todo list.

any prefrance: low E / high I or High E / low I

[ Parent ]

Re: rolling my own (3.00 / 0) (#3)
by finnsawyer on Fri Jun 20, 2008 at 08:34:07 AM MST

Doubling the turns on the coil, if you use the same amount of copper (smaller wire), doubles the open circuit voltage, as Flux states, but that is not likely to be true if you use the same size wire and make the coil bigger (with accommodating change in the size of the alternator). I thought I'd make that distinction clear.
GeoM

rolling my own | 3 comments (3 topical)

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