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Forum Index : Electronics : using recovered solar inverters

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brucedownunder2
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Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 11:20pm 13 Mar 2021

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Hello,

I thought I'd start (probably been done before), a topic on using recovered solar inverters .

At this stage, I'd be interested in the inverter side from 48 volt solar input ,not exporting to the grid ,.

Be interesting to hear from anybody that has the clues as to get them running for a 48 volt input supply. either using the home grid supply to power it or maybe bypass that supply if possible.

Bruce

Bushboy

Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406

Posted: 04:14am 14 Mar 2021

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All the grid tie inverters I have seen, and know of, are for dc solar voltages well above 48 volts.

So your first problem will be rewinding the transformer for 48v input.

Second problem, all inverters use microprocessors these days, and the grid tie units simply will not work without sensing a mains connection. So you can do is toss the big grid tie electronic circuit board straight into the wheelie bin.

What you are left with is a metal box, a big heat sink, and a transformer that needs to be rewound. Those parts are an ideal starting point for building an Oz inverter from scratch.

Sorry, but there is no quick tweak to make a 200 volts (or higher) grid tie inverter work in a 48 volt system without a TOTAL rebuild.

Cheers, �Tony.

brucedownunder2
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Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 06:40am 14 Mar 2021

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OK,

thanks for explaining the facts, I and Aaron are building my inverter , so had a thought of any possibility of using parts . We are nearly finished ,I've made the steel box ,wound the Torodial, and choke, Aaron has bought the boards, so we are on the home straight.

Just a thought ??? ,

thanks Tony.

Bruce

Bushboy

Haxby

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Joined: 07/07/2008
Location: Australia
Posts: 423

Posted: 08:32am 14 Mar 2021

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Not sure if you know that after you build the ozinverter, you can use a working grid tie inverter to feed power back into the batteries?

The ozinverter "creates" the grid that the GTI sits on and the power flows back through the ozinverter to the batteries.

You then need a way of turning off the GTI when the battery is full.

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