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Bossrox

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Grid tie ?
« on: September 10, 2024, 07:59:32 PM »
I'm fully off grid but don't grasp the grid tie concept. It's like a foreign side of solar to me.

Something I don't get about grid tie, is when you're using power, how is it the power is getting drawn 1st from the inverter before going to the grid. If they're both tied together you have equal sources so it's not like your power use can discriminately choose where to take it from. That baffles me. Can anybody explain that?
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JW

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Re: Grid tie ?
« Reply #1 on: September 12, 2024, 12:08:06 AM »
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JW

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Re: Grid tie ?
« Reply #2 on: September 12, 2024, 12:31:01 AM »
One thing about Flavio-

I told him fix the search function, it looks like actually he did it... (it took years)We had nothing in the beginning now that has changed he actually pulled it off.
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JW

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Re: Grid tie ?
« Reply #3 on: September 12, 2024, 01:12:54 AM »
To send power to the grid, a grid tied inverter is needed... this is the only way to do that. Most that have tried that say its not worth it. There are issues with the battery bank.

JW
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sean_ork

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Re: Grid tie ?
« Reply #4 on: September 13, 2024, 04:25:52 AM »
Quote from: JW on September 12, 2024, 01:12:54 AM
To send power to the grid, a grid tied inverter is needed... this is the only way to do that. Most that have tried that say its not worth it. There are issues with the battery bank.

JW

What "issues with the battery bank" ?

... there is no requirement or need to have a battery in order to grid tie your own generation.
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JW

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Re: Grid tie ?
« Reply #5 on: September 13, 2024, 01:24:01 PM »
Let me do a search, I read all the posts as they were made (20years)
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ruddycrazy

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Re: Grid tie ?
« Reply #6 on: September 14, 2024, 05:19:15 AM »
I just setup today a 3Kw Sunny Boy Grid tie to my 1.5Kw solar array where I put all the panels in series to get the voltage up and the first test was a 2400 watt Vax vacuum which ran purfect, now to load it up a bit more put another 1600 watt vacuum on to add more load and both ran fine straight off the grid tie inverter.

So no battery needed at all so from sunup to sun down there is free power to had from these grid tie inverters and my goal is setup it up with a split system aircon for temp control on hot days thru summer
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sean_ork

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Re: Grid tie ?
« Reply #7 on: September 14, 2024, 07:02:52 AM »
... obviously the GTI will stop functioning instantly on loss of mains/grid supply.
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JW

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Re: Grid tie ?
« Reply #8 on: September 14, 2024, 03:53:18 PM »
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ruddycrazy

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Re: Grid tie ?
« Reply #9 on: September 14, 2024, 06:13:18 PM »
Quote from: sean_ork on September 14, 2024, 07:02:52 AM
... obviously the GTI will stop functioning instantly on loss of mains/grid supply.

What grid aint paid a power bill in over two decades and the grid is a couple of K's away and WILL never be connected to my farm
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sean_ork

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Re: Grid tie ?
« Reply #10 on: September 15, 2024, 12:44:25 PM »
Quote from: ruddycrazy on September 14, 2024, 06:13:18 PM
Quote from: sean_ork on September 14, 2024, 07:02:52 AM
... obviously the GTI will stop functioning instantly on loss of mains/grid supply.

What grid aint paid a power bill in over two decades and the grid is a couple of K's away and WILL never be connected to my farm

Great, but you'll be tying the SMA to your own microgrid, if that goes down so will the SMA.
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clockmanFRA

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Re: Grid tie ?
« Reply #11 on: September 16, 2024, 03:15:31 AM »
Please see PDF file for explanation and real working Empirical Evidence, ....

* AC COUPLING WITH OLD GTIs No7.pdf (246.14 kB - downloaded 57 times.)
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JW

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Re: Grid tie ?
« Reply #12 on: September 16, 2024, 10:26:24 AM »
This probably old news, to protect line men, when grid go's down don't send any power to it.
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Bruce S

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Re: Grid tie ?
« Reply #13 on: September 17, 2024, 09:06:43 AM »
Quote from: clockmanFRA on September 16, 2024, 03:15:31 AM
Please see PDF file for explanation and real working Empirical Evidence, ....

(Attachment Link)

You beat me to it!!  ;D

Bruce S
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XeonPony

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Re: Grid tie ?
« Reply #14 on: September 22, 2024, 10:37:20 AM »
Quote from: sean_ork on September 13, 2024, 04:25:52 AM
Quote from: JW on September 12, 2024, 01:12:54 AM
To send power to the grid, a grid tied inverter is needed... this is the only way to do that. Most that have tried that say its not worth it. There are issues with the battery bank.

JW

What "issues with the battery bank" ?

... there is no requirement or need to have a battery in order to grid tie your own generation.

Red tape issue, it is no technology issue. Basically the power companies don't allow it, because in principle you could charge a large battery bank during cheap off peak hours, then sell back during peak pricing. Even though residential doesn't use this scheme.

Basically they want to cripple you as much as possible, even in the so called friendly to renewable areas.

Grid tie with battery inverters are more expensive due to the added circuitry but not by too much.
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sean_ork

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Re: Grid tie ?
« Reply #15 on: September 22, 2024, 03:41:21 PM »
Here in the UK we don't have any of the nonsense hinted at above, arbitrage is actually encouraged by a few forward thinking providers who are experimenting with TOU tariffs with one eye on grid stability and minimising the need to curtail wind generation.
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JW

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Re: Grid tie ?
« Reply #16 on: September 23, 2024, 04:06:06 PM »

 
Quote from: sean_ork
What "issues with the battery bank" ?

Over voltage. there are things to combat this like a dump load that is used mostly for wind mills. 
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sean_ork

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Re: Grid tie ?
« Reply #17 on: September 24, 2024, 04:07:51 AM »
Quote from: JW on September 23, 2024, 04:06:06 PM

 
Quote from: sean_ork
What "issues with the battery bank" ?

Over voltage. there are things to combat this like a dump load that is used mostly for wind mills.

 ::)
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