Solar Panels being clipped /limited on Inverter Input

[djhackett2000]

Hi, just wanted to say thank you. I've got the firmware update now too and all is working perfectly. 5.4kw from pv this morning. 2.7kw going to battery and 2.6kw going to the gird. Not bad for 3.6kw inverter ;-). Winner. Now to install the solar divert!

 

[JonesyJT]

Great news ? I’m glad it sorted it out for you. I too had 5769W being generated ( out of installed capacity of 5.77KW) by PVs and going straight to battery??

Out of interest, who are you with regards selling your export.
What does the solar divert do - is it to an immersion heater?

 

[djhackett2000]

I've just gone with my current supplier as I'm fixed with them to next year, EDF. 5P export. Solar divert is yes, immersion heater and also for ev in the future...

 

[SynSunk]

Hi

hi there,
Yes I just got it resolved this week by a firmware/operating system update by Sunsynk. Was promised it a few weeks ago but didn’t happen. Looks like there was a bug in system. Now working fully?
Will post picture of my version so you can compare.
Hope this helps
View attachment 111057

Glad this worked for you. However, I also have a SunSynk 3.6kW inverter plus SunSynk batteries with firmware version M2.3.7.4. It still won't exceed 3,800W no what the SOC or load.

(For those who say "What do you expect from a 3.6kW inverter?", even SunSynk agree that it shouldn't be throttled to 3.8kW - although they've so far not been able to resolve it)

 

[LGS51177]

I too have the Sunsynk 3.6 and straight away, with a 6.4kW array, 5.2 in perfect South, 1.2 on another roof, I've been getting limited to 3.8 in the inverter.
Looks like I too am going to have to get onto the installer (although they were quite shocking in the fact the settings in the inverter were not right and it wasn't working in the first place).
Failing that a call to sunsynk support tomorrow.

 

[SynSunk]

Is it the SG01LP1? Have you looked at the plate on the side of the inverter and checked the details against the corresponding data sheet? The plate on mine says it'll take up to 7,000W pV (as does Keith Gough, their CEO), but the data sheet says 4,680W (as does their tech support). I'm very interested to hear how you get on, and please share your settings if they give you any useful advice. ??

 

[Al D]

Is it the SG01LP1? Have you looked at the plate on the side of the inverter and checked the details against the corresponding data sheet? The plate on mine says it'll take up to 7,000W pV (as does Keith Gough, their CEO), but the data sheet says 4,680W (as does their tech support). I'm very interested to hear how you get on, and please share your settings if they give you any useful advice. ??

I'm not sure about this, but 7kW is essentially 1.5x the datasheet's 4680W max input. My guess is 7kW represents the machine safety parameter, and the ~4.7kW is the max usable power before clipping. Just a hypothesis.

 

[Ampster]

My guess is 7kW represents the machine safety parameter, and the ~4.7kW is the max usable power before clipping.

My guess is 7kW is the max panel capacity and 4.7 kW is what power will be clipped at because that is all the inverter can output.. That represents a DC:AC ratio of 1.49. SolarEdge allows 1.55. Those numbers could be agressive but it all depends on orientation, tilt and local weather. Solar panels rarely output nameplate capacity and ratios of 1.25 are common.

 

[SynSunk]

My guess is 7kW is the max panel capacity and 4.7 kW is what power will be clipped at because that is all the inverter can output.. That represents a DC:AC ratio of 1.49. SolarEdge allows 1.55. Those numbers could be agressive but it all depends on orientation, tilt and local weather. Solar panels rarely output nameplate capacity and ratios of 1.25 are common.

That would be fine if the power was indeed clipped at 4.7kW, but it's being clipped at 3.8kW. ??

 

[adriaanvw]

That would be fine if the power was indeed clipped at 4.7kW, but it's being clipped at 3.8kW. ??

I've got exactly the same issue with our installation, though I have the SG01 not the SG05 model. I think perhaps the firmware upgrade only fixed the 05 model and not the 01

 

[adriaanvw]

I too have the Sunsynk 3.6 and straight away, with a 6.4kW array, 5.2 in perfect South, 1.2 on another roof, I've been getting limited to 3.8 in the inverter.
Looks like I too am going to have to get onto the installer (although they were quite shocking in the fact the settings in the inverter were not right and it wasn't working in the first place).
Failing that a call to sunsynk support tomorrow.

Did you get anywhere with SunSynk support?

 

[JonesyJT]

I got nothing from Sunsynk UK support. However my installer contacted me and I think Sunsynk dialled in and upgraded the software for me. I got the opinion that they were catching up with units that had been shipped with older firmware

 

[SynSunk]

After numerous phone calls / emails to SunSynk, yesterday they remotely updated the firmware to version M.2.3.8.1. For the first time since installation, the inverter now puts out more than 3,800W.

Throughout this protracted process, the installers were of little help. Initially they were keen to resolve the matter, but latterly seem to have lost interest and failed to even respond to messages. There's no money to be made in providing customer service, I suppose.

SunSynk, on the other hand, were initially reluctant to engage, preferring to signpost me back to the installation company. However, they then recognised the difficulties being experienced and committed to put things right. Their technical support department in South Africa has been excellent, and their techie (Dino) even took his laptop home on a Friday evening so he could see through the update at a time convenient to me. That appears to have fixed the 3,800W clipping issue (although the deteriorating UK weather is making it difficult to fully evaluate).

 

[adriaanvw]

After numerous phone calls / emails to SunSynk, yesterday they remotely updated the firmware to version M.2.3.8.1. For the first time since installation, the inverter now puts out more than 3,800W.

Throughout this protracted process, the installers were of little help. Initially they were keen to resolve the matter, but latterly seem to have lost interest and failed to even respond to messages. There's no money to be made in providing customer service, I suppose.

SunSynk, on the other hand, were initially reluctant to engage, preferring to signpost me back to the installation company. However, they then recognised the difficulties being experienced and committed to put things right. Their technical support department in South Africa has been excellent, and their techie (Dino) even took his laptop home on a Friday evening so he could see through the update at a time convenient to me. That appears to have fixed the 3,800W clipping issue (although the deteriorating UK weather is making it difficult to fully evaluate).

I got in touch with SunSynk support - they upgraded my firmware to M2.3.8.1 and the problem is fixed! No more clipping at 3,800W. Thanks for the advice

 

[LGS51177]

Did you get anywhere with SunSynk support?

No, nothing. However, I did gather that without battery etc, I wouldn't be achieving higher than 3.8kW. I'm awaiting a battery........still! My supplier seem to know nothing about the integral workings of the sunsynk. I asked them about a divert system being installed and they insisted I needed an Iboost etc. I had to explain to the head engineer that the inverter does it all.

 

[skylink]

I got in touch with SunSynk support - they upgraded my firmware to M2.3.8.1 and the problem is fixed! No more clipping at 3,800W. Thanks for the advice

It may be showing 4kW but it's only doing 3.6 so I am a little confused. as to what is the advantage of showing one number but doing another.

 

[scottm85]

It may be showing 4kW but it's only doing 3.6 so I am a little confused. as to what is the advantage of showing one number but doing another.

Are you sure that it is only doing 3.6 though?

 

[skylink]

Are you sure that it is only doing 3.6 though?

Do the math.

 

[scottm85]

Do the math.

But what about this? Basically, clipping will only happen now once the batteries are full.

 

[skylink]

But what about this? Basically, clipping will only happen now once the batteries are full.

Well little spikes here and there??? my comment was on the pic showing 4.03kW and 1.27 + 2.33 = 3.6kW