Anyone install the 8kW inverter with the 595W Canadian solar panels?

Is the panel within specification for the inverter?

Can the invert handle the current?

Panel Spec

Voc - 41.1 V

Isc - 18.42 A

Imp - 17.15 A

We have two 8kW inverters and would like to put 16 of the panels to start off with.

I watched one of the Synsynk You Tube videos recently. I think the max PV input was 10,000W, want to aim for 450V or lower and the max amperage was around 18A. It's got two sting inputs. Why not go for smaller sub 500W panels & not fly so close to the sun? Careful, Icarus...

1 minute ago, WJP said:

I watched one of the Synsynk You Tube videos recently. I think the max PV input was 10,000W, want to aim for 450V or lower and the max amperage was around 18A. It's got two sting inputs. Why not go for smaller sub 500W panels & not fly so close to the sun? Careful, Icarus...

Space is an issue so the lower number of panels the better. It does have a max current of 18A, is that the Isc or Imp that should not be over 18Amps?

The 8kw has 2 mppt’s. so if you plan to spread the 16 panels over both inverters ( ie 4 mppt’s) and limit the panels to 4 per mppt you will be fine on both the volt and amp side. 

You will probably find that the mppt rating will increase to 22 amp with latest software. 
 

if running a parallel setup make sure both inverters have same software version and that cables to the batteries are in equal length.

each mppt can handle 5000 watts so you can add more panels provided you stay below the 450 volts. In fact I would probably do 8 panels per mppt to start with since that will give you better dc voltage and less voltage drop over the dc lines to the inverter. You could also get away with 4mm^2 cable assuming 336 volts on 8 panels in series

Edited September 21, 20214 yr by branderplank

6 minutes ago, branderplank said:

The 8kw has 2 mppt’s. so if you plan to spread the 16 panels over both inverters ( ie 4 mppt’s) and limit the panels to 4 per mppt you will be fine on both the volt and amp side. 

You will probably find that the mppt rating will increase to 22 amp with latest software. 
 

if running a parallel setup make sure both inverters have same software version and that cables to the batteries are in equal length.

each mppt can handle 5000 watts so you can add more panels provided you stay below the 450 volts

Mind my ignorance, should the Isc or the Imp be less that 18Amp?

It is amazing how a software change can increase the limits, I would have thought some of the components needed to be changed.

Just now, hussein said:

Mind my ignorance, should the Isc or the Imp be less that 18Amp?

It is amazing how a software change can increase the limits, I would have thought some of the components needed to be changed.

My 5kw went from 9.9amps to 11 amp per mppt after software update. There was some discussion about this somewhere on the forum. 
 

the amps is not really the issue as the inverter would just clip it if it went over (of course within reason). Usually you have to look at the Isc of the panel. On rainy \ cloudy days when the panels are cold and sun comes out you could even exceed the panel rating for short periods. 
 

4 minutes ago, branderplank said:

My 5kw went from 9.9amps to 11 amp per mppt after software update. There was some discussion about this somewhere on the forum. 
 

the amps is not really the issue as the inverter would just clip it if it went over (of course within reason). Usually you have to look at the Isc of the panel. On rainy \ cloudy days when the panels are cold and sun comes out you could even exceed the panel rating for short periods. 
 

Thank you for your feedback, much appreciated.

12 hours ago, branderplank said:

My 5kw went from 9.9amps to 11 amp per mppt after software update. There was some discussion about this somewhere on the forum. 
 

the amps is not really the issue as the inverter would just clip it if it went over (of course within reason). Usually you have to look at the Isc of the panel. On rainy \ cloudy days when the panels are cold and sun comes out you could even exceed the panel rating for short periods. 
 

I have seen as much as 12.3 amps per mppt with these cloudy/sunny days.

The Sunsynk 5 kW is now rated at 13 amps and the 8 kW at 22 amps with a firmware update

11 minutes ago, Tariq said:

The Sunsynk 5 kW is now rated at 13 amps 

I think in previous discussions it was illustrated that it clipped the amps at around 9.9 amp.

Following the upgrade, it could go over the 9.9Amp threshold. I have not seen the 13 Amps quoted on a spec sheet but have seen the 22 Amps for the 8kw

 

 

@branderplank, the 13 amps was confirmed by Sunsynk, I have a Sunsynk 5 kW with JaSolar 540 watt panels, Imp is 12.9 amps, had a firmware update done and see 12.4 amps regularly and even 12.9 amps once, briefly.

49 minutes ago, Tariq said:

@branderplank, the 13 amps was confirmed by Sunsynk, I have a Sunsynk 5 kW with JaSolar 540 watt panels, Imp is 12.9 amps, had a firmware update done and see 12.4 amps regularly and even 12.9 amps once, briefly.

Which firmware version is that for the 5kW inverter? 

@PowerUser      See below for firmware version

@Tariq Thank you! I'm even on a later version already - MCU:3363

Edited September 22, 20214 yr by PowerUser

Is that the one where the System Mode is split into two screens

38 minutes ago, Tariq said:

Is that the one where the System Mode is split into two screens

Yes. Exactly. 

@hussein Any progress with your install?

On 2021/09/21 at 6:48 PM, WJP said:

I watched one of the Synsynk You Tube videos recently. I think the max PV input was 10,000W, want to aim for 450V or lower and the max amperage was around 18A. It's got two sting inputs. Why not go for smaller sub 500W panels & not fly so close to the sun? Careful, Icarus...

You can safely over wattage the Inverter, there is a video on the Sunsynk youtube channel about it as the Inverter can control the amperage going through it by adjusting the resistance of the inverter. It will not draw more than the rated amps from the panels. 

The thing to be concerned about is the voltage. The inverter cannot lower the Voltage so you need to make sure you stay well clear of the maximum voltages and take into account spikes due to cold panels etc. Otherwise you can expect flames and smoke!

I have 12,740Watts of panels on and East/West split on my 8kw Sunsynk Inverter without any issues. 

 

On 2021/09/21 at 6:05 PM, hussein said:

Anyone install the 8kW inverter with the 595W Canadian solar panels?

Is the panel within specification for the inverter?

Can the invert handle the current?

Panel Spec

Voc - 41.1 V

Isc - 18.42 A

Imp - 17.15 A

We have two 8kW inverters and would like to put 16 of the panels to start off with.

 

Max voltage is 550V 

You could put 12 panels per string, would give you 492V & 7140 Watts per string

2 Strings would give you 14280Watts of panels, bearing in mind that the inverter cannot generate more than 12000Watts of power and generate more than 8kw of AC, that would be a huge overkill and probably result in a quite lot of power being wasted. 

I have an East/West Split with 12740W of panels which works very well with my Sunsynk 8kw, peak solar power at the moment is about 11.2kw and because it is East/West I get it over a longer period of time than North facing panels. 

2 Strings of 10 panels each would probably be the way to go I would think and that would give you 11,900Watts of solar panels

 

Hey @Sc00bs  i have a few questions if you dont mind.What happens when the working array voltage is more than the mppt's working range ?

Also , what is the 370V figure for in the specs below ?

• MPPT Range – 125~425V
• Max V DC input – 370V (100V~500V)

The 370 volts is probably the optimum voltage, but you don’t want to push your string voltage past 450 volts. I was going to 470 volts on one string and in a chat with Keith Gough, he said it should be ok, but that I might peak at over 500 on a very cold day, so decided not to take a chance, based on what he said.

6 minutes ago, Nexuss said:

Hey @Sc00bs  i have a few questions if you dont mind.What happens when the working array voltage is more than the mppt's working range ?

Also , what is the 370V figure for in the specs below ?

• MPPT Range – 125~425V
• Max V DC input – 370V (100V~500V)

I have no idea what the 370V number is, on the Ellies spec sheet for the Sunsynk 8kw, it doesn't have it. 

My understanding is that the 500V number is the one to worry about and to stay well clear off.

 

Max. DC Input Voltage (V) 500V

MPPT Range (V) 125V-425V

Start-up Voltage (V)  150V

Not sure what happens if you go over 425V, smoke and flames over 500V.

I would speak to the guy at support for Sunsynk SA and ask him for confirmation, would be nice to know what he says. 

My own array peaks at 382V

5 minutes ago, Tariq said:

The 370 volts is probably the optimum voltage, but you don’t want to push your string voltage past 450 volts. I was going to 470 volts on one string and in a chat with Keith Gough, he said it should be ok, but that I might peak at over 500 on a very cold day, so decided not to take a chance, based on what he said.

That makes sense @Tariq

23 minutes ago, Tariq said:

The 370 volts is probably the optimum voltage, but you don’t want to push your string voltage past 450 volts. I was going to 470 volts on one string and in a chat with Keith Gough, he said it should be ok, but that I might peak at over 500 on a very cold day, so decided not to take a chance, based on what he said.

Thanks @Tariq that is what i suspected , at 370 volts the mppt would be running at about 87%. Think i read somewhere that the best for efficiency is like 80% so that would indeed make sense. Quite interesting about the voltage peaking on a cold day . I have not found that at all during the past winter ,monitoring the voltages of my panels for a while now and they dont peak in volts on cloudy days but they do peak in amps. The highest voltages i get is when the panels are idling during the day. 

9 hours ago, Sc00bs said:

I have an East/West Split with 12740W of panels which works very well with my Sunsynk 8kw, peak solar power at the moment is about 11.2kw and because it is East/West I get it over a longer period of time than North facing panels. 

 

So the inverter can only ever invert 8kw. Is the balance of power generated going to the battery? Did not know it can exceed 8.8kw on the DC Bus? Or would it be limited to the 10.4kw max solar PV input?