Hi Everyone... New to the forum and have learned a great deal. 

I like the Sunsynk Inverters... Looks more than anything. I want to have a 10kw inverter and Sunsynk only has 8kw and then 16kw in the single phase. Is it possible to use 2x 5kw inverters together or should I just get a 10kw Victron Energy inverter? 

You can parallel two 5kw inverters.

Any particular reason you want 10kw? Is the 8kw too small - in terms of actual usage or is this a want

5 minutes ago, Jacques Ester said:

You can parallel two 5kw inverters.

Thank you!

3 minutes ago, mzezman said:

Any particular reason you want 10kw? Is the 8kw too small - in terms of actual usage or is this a want

To be honest, it's more of a want. I'm currently running a 5kw inverter which is more than enough. The new setup is for my new house, which I will be airconditioned in most rooms and run pumps for the pool and koi fish pond etc. 

I would think 8kw would be fine, but just thinking of a little extra to be on the safe side. Just basing all this on my current consumption and peak thereof. 

1 minute ago, Zweli said:

To be honest, it's more of a want. I'm currently running a 5kw inverter which is more than enough. The new setup is for my new house, which I will be airconditioned in most rooms and run pumps for the pool and koi fish pond etc. 

I would think 8kw would be fine, but just thinking of a little extra to be on the safe side. Just basing all this on my current consumption and peak thereof. 

Ok - at least you have a baseline then. so if you stay in the SS stable then 2x5kw or if you decide to go victron or even axpert/luxpower the you can get the 10kw

11 minutes ago, Zweli said:

To be honest, it's more of a want. I'm currently running a 5kw inverter which is more than enough. The new setup is for my new house, which I will be airconditioned in most rooms and run pumps for the pool and koi fish pond etc. 

I would think 8kw would be fine, but just thinking of a little extra to be on the safe side. Just basing all this on my current consumption and peak thereof. 

Also consider the continuous AC passthrough rating... This is what the inverter will allow through during on-grid scenarios. For the 5kW I think its 32A, which equates to 7.360kW.

For the 8kW I think its at 45A, so 10kW+

and 2 Inverters is a better redundancy than one bigger one.
If you should have a failure of the inverter you can continue to use your solar system albeit with half the available energy.

Edited February 20, 20233 yr by zsde

Thank you so much guys. Really appreciate the input. 

10kVA Victron will only do 8kW sustained anyway (same for 2x 5kVAs)...

Hi, 

 

We have Growatt MIN5000TL-X inverter and it is giving very high voltage output over 255-260V. When we raised the issue, the inverter team said it is due to high grid voltage but we isolated and checked that grid voltage is well within 225-230V.

Then inverter team said Neutral-Earth to earth might be causing the issue and it reads around 15-19V.

Can high N-E voltage cause inverter output to be over 255V?

40 minutes ago, antarya said:

Can high N-E voltage cause inverter output to be over 255V?

I assume so, the N-E Voltage should be 0V, if it is 15V or more, this needs fixing and could well be the reason the inverter is putting out a higher than wanted Voltage, I don't know the Growatt, presumably there is a setting for the Voltage... 220V to 240V, if this is set to 240V ( +15 to 19V, may give you 255 to 259V out...???) anyway, if there is such a setting and its set to 240V, for now, maybe drop it to 220V, but get your E-N connection sorted, it should be 0V period.

1 minute ago, Kalahari Meerkat said:

I assume so, the N-E Voltage should be 0V, if it is 15V or more, this needs fixing and could well be the reason the inverter is putting out a higher than wanted Voltage, I don't know the Growatt, presumably there is a setting for the Voltage... 220V to 240V, if this is set to 240V ( +15 to 19V, may give you 255 to 259V out...???) anyway, if there is such a setting and its set to 240V, for now, maybe drop it to 220V, but get your E-N connection sorted, it should be 0V period.

OK, Thanks. We got 3 New earthing done and still N-E is not reducing below 7. It fluctuates between 7-19V on good days.

But in the inverter setting the Max voltage is set to 280V! by the inverter team which is insane. I can't change it as it requires password.

Can this issue be due to the grid?

30 minutes ago, antarya said:

Can this issue be due to the grid?

the Voltage out on a bi-directional/hybrid inverter like the Sunsynk very much will track the grid Voltage, as far as I can tell, so if the grid Voltage comes up to 255V  so will the inverter Voltage, but this may not be the case with the Growatt, the Neutral-Earth should be a dead short on entry to your main distribution board, I am not sure whether it should be bridged there as well or rely on the link at the commercial suppliers end, if only at the commercial power suppliers end, they would need to resolve this, there should be 0V between earth and neutral on your end, if there is a link at your main distribution board, then there are other connections in the db and after, that are not right, there should be no Voltage present between earth and neutral, unless many 100's of meters of cable are between the bridge between earth and neutral and where you are measuring it, even then, having more than 3 or 4V appear sounds really iffy...

39 minutes ago, antarya said:

We got 3 New earthing done

is this new earth spikes added and connected to the houses earth? it should also link earth and neutral before your ground fault interruptor/earth leakage switch, this way would ensure that the Voltage between earth and neutral is 0V/ensure that neutral is not sitting at even 100V and thus your live sitting at 300-odd V relative to earth...

3 hours ago, Kalahari Meerkat said:

the Voltage out on a bi-directional/hybrid inverter like the Sunsynk very much will track the grid Voltage, as far as I can tell, so if the grid Voltage comes up to 255V  so will the inverter Voltage, but this may not be the case with the Growatt, the Neutral-Earth should be a dead short on entry to your main distribution board, I am not sure whether it should be bridged there as well or rely on the link at the commercial suppliers end, if only at the commercial power suppliers end, they would need to resolve this, there should be 0V between earth and neutral on your end, if there is a link at your main distribution board, then there are other connections in the db and after, that are not right, there should be no Voltage present between earth and neutral, unless many 100's of meters of cable are between the bridge between earth and neutral and where you are measuring it, even then, having more than 3 or 4V appear sounds really iffy...

is this new earth spikes added and connected to the houses earth? it should also link earth and neutral before your ground fault interruptor/earth leakage switch, this way would ensure that the Voltage between earth and neutral is 0V/ensure that neutral is not sitting at even 100V and thus your live sitting at 300-odd V relative to earth...

The meter reads what solar inverter gives but if we disconnect the solar inverter then immediately meter reading comes down to 223-230V. If we connect solar inverter to the meter then only voltage increases.

 

The 3 earthing done is for solar plant and it is not connected to house earth. House earth has separate earthing. The voltage rise was never an issue before solar plant.

5 hours ago, antarya said:

The meter reads what solar inverter gives but if we disconnect the solar inverter then immediately meter reading comes down to 223-230V. If we connect solar inverter to the meter then only voltage increases.

 

The 3 earthing done is for solar plant and it is not connected to house earth. House earth has separate earthing. The voltage rise was never an issue before solar plant.

Based on the inverter being the reason why the voltage rises. End of story. Someone is just shifting the blame for a fault. All grid tied will track the grid IF working as it should and be just about 1V higher than grid.