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Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1395

Posted: 05:42am 05 Apr 2025

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G'Day Guy's,
Well looking for my old post on grid tie was like pulling teeth so hence this new thread on the topic of powering my shearing shed.

Now I am working again this project is going ahead and my excavator is up there and after a couple runs with it the job of leveling and filling is going to easy

This brings in the power system I want to put in.

12 1,000AH Ceil deep cycle batteries for a 24 volt setup.

The inverter will be Poida's totem pole board as yes I am behind the times and I did buy every component for it. Got all the passives on the board and soon I'll drill and tap the heatsinks to fit all 24 HY5608 fets as I do have plenty here.

Now on reading Poida did push 4Kw or more out this board with a single toroid

Now as I do have to see AEM Cores to get the toroids I'm thinking of stacking 2 of them and get their winding shop to wind the secondary on. So as we only need the secondary I am going to ask to use the thickest wire that can fit so it can suit the back feeding.

This does make me think about this back feeding from using a grid tie, now I do have a couple of 5Kw grid ties here and 6.3Kw of solar so I'm thinking the back feeding can just charge the batteries.

To keep warm in winter that 1850 wood stove that has a wet back so some 2" poly pipe will be in the concrete slab will be put in.

Regards Bryan

Godoh
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Joined: 26/09/2020
Location: Australia
Posts: 498

Posted: 03:52am 06 Apr 2025

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Hi Bryan, good luck with the shed power system upgrade.

I back feed with about 5.6 kw of panels through a 24 volt 8010 inverter. Or when charging the car through a 3kw Latronics inverter. (I have change over switches to select which inverter I want to use)
I use two 5kw GTI inverters one connected to 3.2 kw of panels, and one connected to 2.4 kw of panels.
What happens is that in the morning the panels output all they can backfeeding through the GTI inverters. The batteries are charged up fairly fast and the voltage controlled relays switch relays that I have fitted in the GTI inverters outputs to cause them to anti island.
The only time I use full power from those two banks of panels is when charging the car.
Then I have seen 5.5kw going into the car. As the power is being used the battery voltage is held down enough that both GTI inverters are working.
Sometimes one or both GTI inverters still anti island and switch off, then the battery inverter charges the car until the battery voltage falls enough too turn the relays back on.
If both GTI inverters tried to backfeed and only charge the batteries on a sunny patch of the day the Battery inverter would be overloaded.
So far that has not happened as one of the GTI inverters is set to to anti island before the other.
Pete

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