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Ddonald

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Posts: 3
Reply with quote  #1 
My current house electrical panel is 240 split phase
I am trying to install a 24vdc inverter/charger
Most I see give you two wire 240 volt
I dont think that will work as a grid tie using AC Coupling
I am using Replus 240A Micro Inverters that I think will be grid tied
So do I need a 24vdc Inout/ 240 AC input / 240 plait phase output inverter/charger
Thanks

stmbtwle

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Posts: 2,955
Reply with quote  #2 
Not enough information.

Which country are you in? We have members all over the world, with different electrical systems and different objectives.

Can you post a link to that specific inverter? Inverters made for the US market will generally work in the US; others probably will not.

When all else fails, download and read the directions.


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Ddonald

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Posts: 3
Reply with quote  #3 
California
SCE
240 Split Phase L1-N-L2
This requires a Split Phase Micro Inverter
Most I see are 240 Single Phase  L1-N
So the one I have for testing will not work
I also need a 24vdc Inout/ 240 AC input / 240 split phase output inverter/charger

I could run the PV 240 Single Phase into the inverter/charger
but I dont think thats a good idea

I think I have answered my own question
I cant use 240 Single Phase Micro Inverters on a 240 Split phase system
Need an enphase IQ type Micro Inverter
stmbtwle

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Reply with quote  #4 
A 240v single-phase inverter may be built for the NON-US market.

Some US systems use TWO, 120v single-phase inverters, one for each leg.

Many grid-tied inverters will NOT work with batteries.

Battery-based inverters generally are NOT grid-tied.

I think what you want is a "hybrid" or "grid-interactive" inverter/charger. Look here: http://www.solar-electric.com



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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
tacman7

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Posts: 42
Reply with quote  #5 
Split phase is what I would call normal service. What I find in any residential house I've ever been in.

Two hots and a neutral.

Split phase = single phase:

https://en.wikipedia.org/wiki/Split-phase_electric_power

Any residential grid tie inverter is going to work with that.

Are you talking about things like this:

https://www.wholesalesolar.com/2931730/sma/inverters/sma-sunny-boy-7.7-us-inverter

Or this:

https://www.amazon.com/ECO-WORTHY-Switch-Inverter-Limiter-System/dp/B076KBCHBM/ref=sr_1_3?

?


Ddonald

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Posts: 3
Reply with quote  #6 
I got it figured out
I need to use a micro inverter like the IQ series like ENPHASE IQ7-60-2-US
These are connected to the grid (simplified statement)
A Hybrid Inverter/Charger is also connected to the grid like the Schneider Electric Conext SW 4024 Inverter/Charger
When Grid power goes down, this unit triggers a relay to disconnect the system from the grid, during the day you run off the PV array
and charge the batteries, this unit will throttle the charge to the batteries to keep from smoking them
and at night you run off the batteries. When the grid comes back up the unit will switch the relay and PV to load and grid
There is a little more to it, but that's it in a nut shell
stmbtwle

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Reply with quote  #7 
That should work, I think, with the battery inverter providing the "grid" signal for the microinverters to follow. Otherwise they would shut down.
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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
colinmcc

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Posts: 176
Reply with quote  #8 
Attached is an old Enphase application note (dated 2014) on AC coupling of Micro inverters to Battery based systems.

You can find many other documents, application notes, and schematics on AC
Coupling at the following websites.
Magnum Energy http://www.magnumenergy.com/Documents/DocsFront.htm
Outback Power Systems http://www.outbackpower.com/index.php/applications/ac-coupling
MidNite Solar http://www.midnitesolar.com/index.php

 
Attached Files
pdf Enphase_Application-Note_AC-Coupled-Battery-Based-Systems.pdf (1.55 MB, 3 views)

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