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PASS THROUGH current in hybrid inverters


Tariq
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I have a 5 kW Sunsynk hybrid inverter, I have pushed the total AC load to around 6 kW, but the inverter itself never goes over 4998 watts, which is obviously the most the inverter can push thru and the rest comes from the grid.

 The way I understand how a hybrid system works, imagine a stream feeding into a river, the stream is the inverter and the river is the grid, so the size of the river does not matter to the stream, it can only feed in what it’s width and depth will allow.

 So my question is, what is PASS THROUGH current

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I found this when reading up on it. 

It's basically the ability to take additional ac power and simply allowing it to pass through the inverter to the connected loads without the inverter needing to do anything to the power. 

It's a relay that closes when the grid or another ac source is available allowing the inverter to use this ac source when available DC is not sufficient. 

My only question relating to this is, is the pass through current an addition to the inverter rating or total ac loads that the inverter can supply. I.e. The 8kw sunsynk has a pass through rate of 90A and output rate of 35A. Does this make for a total of 125A? Or is the 35A included in the 90A figure? 

Not that I will ever come close to these figures as my grid supply is limited to 63A from the municipal meter. 

Screenshot_20210129-112823_Chrome.jpg

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3 hours ago, Achmat said:

I found this when reading up on it. 

It's basically the ability to take additional ac power and simply allowing it to pass through the inverter to the connected loads without the inverter needing to do anything to the power. 

It's a relay that closes when the grid or another ac source is available allowing the inverter to use this ac source when available DC is not sufficient. 

My only question relating to this is, is the pass through current an addition to the inverter rating or total ac loads that the inverter can supply. I.e. The 8kw sunsynk has a pass through rate of 90A and output rate of 35A. Does this make for a total of 125A? Or is the 35A included in the 90A figure? 

Not that I will ever come close to these figures as my grid supply is limited to 63A from the municipal meter. 

Screenshot_20210129-112823_Chrome.jpg

What is the source of your screenshot?

Good questions.

 

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Busy hooking up a 5 kW Sunsynk to a single phase 63 amp supply, as the stove is not going to be on the inverter non essential circuit, will the CT be AFTER the stove or at the entry point of the grid supply.

 My grid is three phase and I dedicated one whole phase to the inverter on my own setup, so in the above case, not sure where the CT clamp goes.

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If I hooked up the stove to non essentials, then The stove will be first be supplied by solar/battery and then grid, so, yes, will be installing the CT clamp after the stove

   So pass through current is the maximum current AFTER the CT clamp, is that correct ?

Edited by Tariq
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9 hours ago, Achmat said:

I found this when reading up on it. 

It's basically the ability to take additional ac power and simply allowing it to pass through the inverter to the connected loads without the inverter needing to do anything to the power. 

It's a relay that closes when the grid or another ac source is available allowing the inverter to use this ac source when available DC is not sufficient. 

My only question relating to this is, is the pass through current an addition to the inverter rating or total ac loads that the inverter can supply. I.e. The 8kw sunsynk has a pass through rate of 90A and output rate of 35A. Does this make for a total of 125A? Or is the 35A included in the 90A figure? 

Not that I will ever come close to these figures as my grid supply is limited to 63A from the municipal meter. 

Screenshot_20210129-112823_Chrome.jpg

I asked the guys from solar-shop this a while ago and their answer was that the pass through figure is the total max, which includes the inverter's contribution. 

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15 minutes ago, Speedster said:

I asked the guys from solar-shop this a while ago and their answer was that the pass through figure is the total max, which includes the inverter's contribution. 

Thanks. No way I'll ever be able to test this theoretical limit unless I decide to get one of those 18kw generators, plug in every single appliance I have and pull an extention cord to a couple of neighbours 🤣

90A is nearly 20kw of continuous ac power. 

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  • 3 months later...

Wait. So the Sunsynk can't deliver more than 35A for grid and solar combined? So if you have some large loads you need to make sure some are not connected to the inverter at all, not even on Non Essential, in case they're all on at the same time? If the inverter shuts down if the 35A is exceeded, will I be without power completely?

Does the same apply with string inverters? I see the 4.6kW Solis 4G has a Max Output Current of 21A? I always thought that larger loads would just be supplemented by the grid, but if my load was 25A what would happen? Would I lose power?

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35 amps is 8050 watts, that is quite a large, I have gone up to 7650 watts total with no problems, if you need more than that get the 8 kW Sunsynk, not sure but think it goes to 90 amps x 230 volts = 20,700 watts, most single phase houses have a 63 amp main breaker

   Loads larger than the inverter rating are installed BEFORE the CT clamp

Edited by Tariq
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Ok so this is lame. Someone showed me a screenshot from their Goodwe ES which blends PV and grid for over 9kW, even though itself can generate only 4.6kW. They've done up to 13kW no problem (on the non-essentials loads). Are you saying the 5kW Sunsynk can't do this?

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15 minutes ago, gooseberry said:

Ok so this is lame. Someone showed me a screenshot from their Goodwe ES which blends PV and grid for over 9kW, even though itself can generate only 4.6kW. They've done up to 13kW no problem (on the non-essentials loads). Are you saying the 5kW Sunsynk can't do this?

Non essential is not going through the pass through. That's before the inverter. 

The pass through applies to the essential load. What can the Goodwe do on the essential side over the rated 4.6kW?

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Just checked the manual for the Goodwe and max AC pass through is 7 360W or 32A which is lower than the sunsynk at 35A

 

What you probably saw was the value of the CT sensor that records total power coming from the grid. You can put anything before the inverter on the non essential side as this comes directly from the grid and is not the pass through value. 

 

Pass through is the value of the essential loads over and above the rated inverter power. 

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Please would someone clarify. If the "Limit to Load" is unticked then the inverter can feed excess power to the non-essential loads and  the CT needs  to be placed on the i/c grid feeder. All good.

But his power shown on the main display dial "AC Grid". This starts red lining before 5kW and max. at 5kW. So 8kw from the grid over drives this dial. 

Don't have the screen shot of the dial. But it was full. Max at 5kw

 

Screenshot_20210513-223247_Gallery.jpg

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