Difference between 208V and 240V grid tie pv system?

[wika_boy]

I was wondering if anyone knew what the difference between the 208V and the 240V grid tie system?

[fromport]

I was wondering if anyone knew what the difference between the 208V and the 240V grid tie system?

240 volt == split phase (2x 120 volt)

http://en.wikipedia.org/wiki/Single-phase_electric_power

vs
208 volt == 3 phase system

http://en.wikipedia.org/wiki/Three-phase_electric_power

Tip: use google next time, this one was almost too easy...

[wika_boy]

Difference between 208V 240V gird tie pv system?

So one type of system is made for a 2 pole single phase system and one is made for a 3 pole 3 phase system?

[fromport]

So one type of system is made for a 2 pole single phase system and one is made for a 3 pole 3 phase system?

Yep!

When you have a 3000 Watt inverter to feed into the grid:
@ 120 volt that would be 25 amps for a single phase
@ 240 volt split phase that would be 12.5 amp total
@ 208 volt 3 phase that would be just less than 5 amp's per phase.

[wika_boy]

So if someone were to hoop up a pv grid tie system to a residental 240V panel, they could hook it up to one hot leg or hook it up to both hot legs. What would be the difference between hooking up to one hot leg or to both hot legs?

[russ]

So if someone were to hoop up a pv grid tie system to a residental 240V panel, they could hook it up to one hot leg or hook it up to both hot legs. What would be the difference between hooking up to one hot leg or to both hot legs?

İf someone doesn't already know this (such as me) one would hope they leave it to an electrical type!

İf it is for an illegal connection then no problem - go ahead but try to get your affairs in order first.

[wika_boy]

ho cuz just relax, I was just asking just for my general knowledge, so no worry k.

[fromport]

So if someone were to hoop up a pv grid tie system to a residental 240V panel, they could hook it up to one hot leg or hook it up to both hot legs. What would be the difference between hooking up to one hot leg or to both hot legs?

No,
you buy/use an inverter that is designed for 120 , 240 or 208 volt

You hook it up accordingly. You can not change it.

Eg:
My outback (3600 watt) GVFX inverter uses single phase 120 volt
My enphase M190 (watt) inverters uses 240 split phase.

I can not connect it otherwise.

What i was trying to explain is that the higher the voltage, the lower the current. High currents are responsible for high line losses. You will have to use serious copper to avoid that.

Hope i'm more clear now.

[wika_boy]

Ok, thanks for your help man. Appreciate it

[lile001]

fase.

Sorry, I just can't help it. "Phase" is spelled with a P. It might help folks on a Google search to know this. Pardon me for being picky.

[fromport]

Sorry, I just can't help it. "Phase" is spelled with a P. It might help folks on a Google search to know this. Pardon me for being picky.

You are right.
I stand corrected.

Lame excuse:
i am originally from Europe (2 years in US now) where you do write it as "fase" instead of "phase".
Old habits die hard it seems
Sorry

Will try and edit my postings and correct my spelling mistakes,
Thanks!

[ionized]

240 volt == split phase (2x 120 volt)

http://en.wikipedia.org/wiki/Single-phase_electric_power

vs
208 volt == 3 phase system

http://en.wikipedia.org/wiki/Three-phase_electric_power

Tip: use google next time, this one was almost too easy...

Or you might be really "lucky" and have a three-phase high leg 120/240 open delta system like mine.

[lile001]

Or you might be really "lucky" and have a three-phase high leg 120/240 open delta system like mine.

Yeeow! "wild leg" systems are taken out like varmints whenever my local utility has one in their sights. Same with "corner grounded delta".

[ionized]

They seem to be relatively common around here. I used to own a 1950 home that was built with it, as were others on the block. It seems to have been common in homes built with early central air (with water-cooled condensers).

What I have now, is not only, wild/high/*&^%# leg, but also open delta. I have come to understand that this means you are not supposed to connect anything but balanced (three-phase) loads to the high leg. That means that it can only be used for three-phase even though you can get somewhere between 208 and 240 single-phase between that an any other leg. Only the other two legs can be used for 240 and, of course, 120 single-phase.

[MarineLiner]

ho cuz just relax, I was just asking just for my general knowledge, so no worry k.