Sunsynk 8kW

[Vassen 95]

@Johann1982

has the aux restart issue been resolved now. 
 

I installed a microinverter to my gen port and it seems to be restarted the microinverter every few minutes. 
 

 

[Johann1982 52]

@VassenHi, yes Aux restart no longer an issue after latest firmware mod.

[Johann1982 52]

On 2020/09/01 at 6:44 PM, Achmat said:

@Johann1982

I take it that the aux restarting issue had been completely resolved now. 

Thinking of putting the rest of my loads back on the aux of its fixed. 

Yes, no more restarting issues. Everything is running smoothly. 

[Johann1982 52]

On 2020/08/20 at 12:51 PM, Halcyon said:

Hi Johan, do a voltage check between load neutral and earth when AC grid is off.  One of the Sunsynk manuals specifically states you will read 110v with a floating neutral unless resolved with a relay.  My load output neutral earth measured +- 50V when in island mode but this was resolved when I installed a relay.  The 50V gave me a little bite when touched. Surprisingly my E/L did trip when you press the test button without relay installed but I was told that is not a reliable test for safe functioning.  The Sunsynk definitely does not have an internal relay doing the bonding job like a Victron.  I bought a R100 40A NO relay from ACDC.  It is so small I fixed it with cable ties inside the inverter.  As you know there is a lot of space inside once you open the front cover.

@HalcyonDo you perhaps have the product code for that relay? Voltex this side is useless and would like to order a couple to use with my future installations.

[JustinSchoeman 49]

This is the one I am using:
https://www.acdc.co.za/pages/product-individual?CGB-1C 230VAC

[Vassen 95]

11 minutes ago, JustinSchoeman said:

This is the one I am using:
https://www.acdc.co.za/pages/product-individual?CGB-1C 230VAC

Hi Justin.
Are you using that with the sunsynk? That’s a 12V DC coil relay. 
 

this is what I’m using. 

[JustinSchoeman 49]

Picture is a 12V - product code is the 230V one (they use the same picture for all the CGB-1C product codes).

[Vassen 95]

30 minutes ago, Johann1982 said:

@VassenHi, yes Aux restart no longer an issue after latest firmware mod.

Thanks. R&D are apparently looking at my issue now. 
 

 

[Vassen 95]

2 minutes ago, JustinSchoeman said:

Picture is a 12V - product code is the 230V one (they use the same picture for all the CGB-1C product codes).

Okay cool thanks. There’s a acdc express close to me. Will check if the have stock. 

[Bloubul7 45]

I used a 60a solid state relay from Communica.  Might be a little overkill but should last

https://www.communica.co.za/products/ksi600a60-l

[Halcyon 5]

On 2020/09/27 at 9:04 AM, Johann1982 said:

@HalcyonDo you perhaps have the product code for that relay? Voltex this side is useless and would like to order a couple to use with my future installations.

Hi Johann, Yes the one I have is the same as Justin's as per the link he posted.  Just marked as 12V somewhere in error on the page but must be the 230V 40A version.

[Johann1982 52]

Thanks, appreciate it.

[Vassen 95]

I went to the local AC/DC express and they didn’t have in stock but were able to order for me. It should be there today. 

[Gnome 106]

On 2020/09/27 at 11:07 AM, Bloubul7 said:

I used a 60a solid state relay from Communica.  Might be a little overkill but should last

https://www.communica.co.za/products/ksi600a60-l

"Solid state relays" do not provide electrical isolation.  When the MOSFETs on the solid state relay fails, it'll fail short circuit.  Mechanical relays don't have this problem.  You really should not be using that relay.

EDIT: Also it looks like your are connecting the relay using a low voltage circuit?  If that is the case, you've effectively removed the isolation from the low voltage circuit.  A very big no-no.  Anything connected to that low voltage circuit (including network cables) can become live.

Edited September 29 by Gnome

[Bloubul7 45]

12 minutes ago, Gnome said:

"Solid state relays" do not provide electrical isolation.  When the MOSFETs on the solid state relay fails, it'll fail short circuit.  Mechanical relays don't have this problem.  You really should not be using that relay.

EDIT: Also it looks like your are connecting the relay using a low voltage circuit?  If that is the case, you've effectively removed the isolation from the low voltage circuit.  A very big no-no.  Anything connected to that low voltage circuit (including network cables) can become live.

Thanks,

Will replaced it with a mechanical relay.  It is driven by 220V, the inverter provides a 5 amp 220v islanding switch

[Gnome 106]

3 minutes ago, Bloubul7 said:

Thanks,

Will replaced it with a mechanical relay.  It is driven by 220V, the inverter provides a 5 amp 220v islanding switch

Actually I stand to be corrected:  They internally do use opto-isolator to create isolation: https://www.electronics-tutorials.ws/power/solid-state-relay.html

Just verify in the specification of the relay you bought that it does actually isolate.

[Bloubul7 45]

54 minutes ago, Gnome said:

Actually I stand to be corrected:  They internally do use opto-isolator to create isolation: https://www.electronics-tutorials.ws/power/solid-state-relay.html

Just verify in the specification of the relay you bought that it does actually isolate.

Thanks, yes they are Opto-isolated

[JustinSchoeman 49]

2 hours ago, Gnome said:

"Solid state relays" do not provide electrical isolation.  When the MOSFETs on the solid state relay fails, it'll fail short circuit.  Mechanical relays don't have this problem.  You really should not be using that relay.

I think you may be confusing failure modes... Solid state relays are all isolated, and pretty much only a lightning strike could break down the control to load isolation.

The main safety drawback of SSRs is that the primary failure mode is fail-closed - i.e. if the output fails, it fails in such a way that it carries on conducting.  Mechanical relays can fail closed, but it is extremely rare (something like 1:10^7 for typical relays) - if they fail, they usually fail open - i.e. load disconnected, which is generally a much safer failure mode.

[Gnome 106]

14 hours ago, JustinSchoeman said:

I think you may be confusing failure modes... Solid state relays are all isolated

To be honest with you, I figured from first principles.  Only after did I go read more about it.  I knew that solid state relays were just MOSFETs.  And MOSFETs always fail short-circuit.  However the opto-isolators is pretty decent isolation.  The reason I thought this is because you don't typically expect a relay to consume current on the switching side, only the coil side.  Bit of a drawback with using them I guess.

14 hours ago, JustinSchoeman said:

only a lightning strike could break down the control to load isolation.

Most opto-isolators are rated roughly 4kV, so it doesn't take *that* much to break the barrier (lightning tests typically start at 200kV up to 1MV).  In terms of break-down voltage it is much easier to get higher kV ratings using opto-isolators than relays anyway.  Isolation is more about failure mode than breakdown voltage.

Edited September 30 by Gnome

[Achmat 34]

Anyone with more than 8kwp of panels and the sunsynk 8kw inverter? 

Yesterday I had my first 50kwh of pv production and the display on the inverter seems to only record 50kwh and stops counting pv production beyond this. 

Today looks like another 51kwh solar day and the inverter stopped recording pv production. 

Edited October 12 by Achmat

[Werner67 0]

Hi Achmat

I do record more that 50kw a few times when able to use all the power.

have 8.6kw of panels.

[Achmat 34]

36 minutes ago, Werner67 said:

Hi Achmat

I do record more that 50kw a few times when able to use all the power.

have 8.6kw of panels.

Sunsynk support updated my device on Friday so now the inverter shows the full pv production. 

Seconds pic was before the update. 

Edited October 18 by Achmat

[lancelot 11]

Nice to have something to "do" with all your production. 

[nic13 0]

Hi all

anyone have the last mcu and hmi firmware files for the 8k?

thanks