Our DIY Grid Tie Inverter

Our DIY Grid Tie Inverter

Category:

Science & Technology

Tags:

• Grid
• Inverter
• DIY

[PTranCypress]

@Xringer

You are correct!

I have talked to many, many but you are the first one who crack the code.

Th Cap has other functionality to smooth the AC curve as well.

Very Congratulation

[Xringer]

@PTranCypress

So, your rig will allow backwards current flow from the battery.

That's why you used bi-directional triacs.

Since it's wired like a battery charger with the battery installed backwards, you get backwards current from the battery to the grid.?.

It seems like the AC pulse voltage and the battery voltage will be added together.

That higher voltage will be fed back onto the grid.. Limited by the size of the cap..?.

The cap is a resistance in series with both voltage sources.

[PTranCypress]

@Xringer

Yes but NO NO NO big NO.

The Bridge rectifiers do not allow reverse bias.

[Xringer]

@PTranCypress

I got some time to trace the current flow, and it looks like the diodes only allow the triacs to turn on and conduct current in one direction only.

(120 hz Positive pluses will be present @ left side of cap).

when I look at the function of the diodes, they seem to be making the triacs function like diodes.

Humm, the output wave form looks like it might be the same as a regular full-wave bridge rectifier..

If that's true, you could cut the cost of this thing way down..

[PTranCypress]

@Xringer

at that design --->fuse burned

[Xringer]

@PTranCypress

Why is that? If a 1:1 transformer were used to isolate the hot side of the AC,

that could reduce the shock hazard (relative to earth ground).

Is there no gate voltage limitation on the Triacs?

[PTranCypress]

@Xringer

Transformer; don't works well.

[PTranCypress]

@Xringer

Utility company only allows up to (168V?) as I recall. Not sure.

The limitation of the sign is AMP not volt. have not tested to see how high it goes.

When We work on the RIIG the similar design busted at about 160V - For safe I say 50 ...... (50+110=160)

[Xringer]

@PTranCypress

Looking at the circuit, it appears the the Hot side of the 120 AC line can be switched (triac) onto the DC input (solar panels).

This means that someone outdoors could put her finger on the +14VDC from the solar panel, and feel 120VAC flowing down to her toes on the grass..

I think this design needs an isolation transformer..

[Xringer]

@PTranCypress

I was wondering about the 50v limit. I was thinking it had something to do with the line voltage.

IF the 50v DC limit is related to the 115vac line voltage, then a plain single phase 220vac version should work.

Providing the parts were rated for the higher voltages, the DC limit would be double.?.