3 hours ago, Sc00bs said:

The only problem with this setup is that the inverter cannot power the non-essential items with power from the PV Panels. Non-essential items will then only be able to get power from the grid. 

Not true. 

You can still push power back to loads before the inverter. It's a bi directional inverter so the grid connection is both an input and an output. 

The aux is an additional connection if you want to have non essential after the inverter. You could still leave non essential loads before the inverter and the inverter will push power to these loads either from excess solar or batteries depending on software settings. 

 

Grid > CT sensor > non essential loads >< inverter > essential loads 

Thank you @Achmat & @Vassen for the correction.

 I assume that you would have to have a sensor in place so that power is not fed back into the grid, is that correct?  

Can someone tell me, I am looking at either a Sunsynk 8kw system or a 5kw and then perhaps adding a second 5kw on a bit later.

If I have 2 x 5kw Sunsynk inverters in parallel, would that allow me to connect 2 x 6500w of panels using all 4 mppt controllers or are there some restrictions when using the inverters in parallel? 

 

Thanks

 

9 minutes ago, Sc00bs said:

Thank you @Achmat & @Vassen for the correction.

 I assume that you would have to have a sensor in place so that power is not fed back into the grid, is that correct?  

Yes. There is a sensor after the grid meter.

1 minute ago, Vassen said:

Yes. All 4 mppt can be used but your battery bank will also need to be sufficiently large to allow for 10kw inverter unless you are just planning to use it as grid tied.

I have read that if you are running inverters in parallel, then you can only connect 1 generator though if you are planning to use the gen input. You will also need to have a common battery bank. 

Thanks @Vassen, seldom pull more than 2kw at night so don't need batteries to run a 10kw load. The large PV panel array would be to offset non-essential items that I would like to cover during daylight hours with my PV panels when funds allow. Thinking of starting with a 5kw Inverter and then I can slot another one on later if I want rather than spending the extra for the 8kw out the box.

Hi 

I have a problem with the evaluation that it is a Dye fault  that non essential line drops to 170v ac and causes the non essentials to switch on and off. This is the line that is connected to Mains input. This can only happen if there is a wiring problem with resistance and a load with high current is switching on or the supply from Mains is a problem. The Mains voltage will always override the Dye compensation voltage if Dye voltage drops. A  Dye inverter  cannot stop the voltage (current flow) unless it is higher than the mains voltage and if it should drop the Mains would compensate.

I might be wrong and I am not an electrician however I have a Sunsynk which is the same as a Dye and have heard of no problems other than for the update for firmware for the parallel connection. 

Edited November 4, 20205 yr by Peter Topp

Hi Vassen 

I am sure this can happen as you have mentioned and have not looked into that and did not know you can use the gen. input as an output.   I have gone through all of the docs and videos and have missed that part. I only know that the gen input does not give feedback if used as an input and also  only allows current in stages till full output. I do not understand why you would use the gen input as an output as you can block the feedback to mains with the ct if installed correctly when non essential loads are connected to it. I would think the best is to just connect the no non essential loads to the mains input and use the ct as a block back to mains when needed.

I will now go back and check the docs and see what I have missed.

Hi

I have gone back and read the documentation and yes indeed it does deal with (smart load) for Dye or (aux load) for Sunsynk. I probably missed it because I use the gen. input for a generator.

19 minutes ago, Peter Topp said:

Hi Vassen 

I am sure this can happen as you have mentioned and have not looked into that and did not know you can use the gen. input as an output.   I have gone through all of the docs and videos and have missed that part. I only know that the gen input does not give feedback if used as an input and also  only allows current in stages till full output. I do not understand why you would use the gen input as an output as you can block the feedback to mains with the ct if installed correctly when non essential loads are connected to it. I would think the best is to just connect the no non essential loads to the mains input and use the ct as a block back to mains when needed.

I will now go back and check the docs and see what I have missed.

One reason to use the gen as an output is that you can power these loads during load shedding. 

With all non essential loads before the invert you cannot send power back to them if the grid is down. 

On 2020/11/03 at 12:36 PM, Vassen said:

 

I started in stages with Just the inverter and 1 string of 6x 420w panels

Hmm I'm looking to move 4x Canadian Solars of 400w each to the east. Will that provide sufficient voltage for the Sunsynk 5.5? I don't really have space for a 5th panel on the east. 

Thanks @Vassen

I get 40.8v? 

Canadian_Solar-Datasheet-HiDM_CS1U-MS_EN.pdf

Trying to get my head around the smart load output, you guys mention having a non-essential eg geyser connected to it, as I understand it, then it is NOT connected to the grid after the CT clamp and before the inverter.

1 hour ago, Vassen said:

Correct.

You will have main feed -> ct coil -> non essential loads before inverter -> inverter 

-> essential loads on load output 

-> “partial essential” loads on aux 

Do you put the "partial essential load" on its own DB?

I was wondering the same how one would wire your geyser into the normal DB but also include it on the aux output of the sunsynk

Hi,

I have installed a 8.8 Kw Sunsynk Hybrid inverter and all is up and running. I have fitted a small surface mount DB Board for the essential items on the load to eliminate the earth leakage from tripping. 

I feel that the power consumption from the grid is still high as the Freedom won Lite 10/8 is fully charged and that the supply from the panels are in spec. the diagram on the inverter reflects nil from the grid. 

The house is fitted with a conlog prepaid meter of which the daily usage (24 Hours) is still on average 20 units.

Your feedback will be appreciated.

Francois van Wyk.

0764823933

Herolds Bay.

 

 

Hi Vassen,

The CT Coil is fitted correctly, the app shows power flowing back but have not checked the prepaid meters results.

Is there no other settings which could be made to restricted the pre paid meter or power from the grid.

Your assistance in this regard will be appreciated.

Kind Regards.

Francois

 

11 minutes ago, Francois van Wyk said:

Hi Vassen,

The CT Coil is fitted correctly, the app shows power flowing back but have not checked the prepaid meters results.

Is there no other settings which could be made to restricted the pre paid meter or power from the grid.

Your assistance in this regard will be appreciated.

Kind Regards.

Francois

 

Can you post a screenshot from the app for grid purchasing power.

.This is mine on a normal day.  

Orange is buying from the grid and pink is battery discharging. 

 

Middle section is during pv production so no grid or battery used. 

Can these Sunsynk inverters run without any solar panels? Might sound crazy but I'm thinking of putting a system into my home starting with single battery grid backup for load shedding and eventually upgrade to solar and add more batteries.

10 minutes ago, Vassen said:

Yes the can. Perfectly fine. 
 

your output power will be limited to the max power from the battery though so depending on what battery you plan on getting, it needs to be according to your max load. 

Thanks! Probably a single Pylontech US3000 in a cabinet with room to add more. For now this would only be for lights and most plugs but excluding any major appliances and the geyser of course. Fortunately the DB is quite well laid out so can feed high consumers before the inverter.

1 minute ago, Vassen said:

Okay. With 1 us3000 you are limited to around 1.8kw of peak power. If you manage your loads it should be fine. 
 

you should look at getting the us3000c instead of normal us3000. Can be discharged to 5% compared to 20%. Doesn’t cost much more 

Yeah, I see there's a newer model now so would definitely go that route. Our usage is pretty low (<20 kWh/day) with LEDs everywhere and not much more than the usual electronics: easily under 1.8kw. Going to convert to kettle on gas hob so just need to avoid microwave and espresso machine which are both >1.5kw.

Good day

I am new to the forum but would appreciate it if someone could share some knowledge on a problem I am currently experiencing with a Sunsync 8kW hybrid installation.

It appears as if the inverter switches off the main supply to the house. Every now and then the AC light on the inverter turns off and power supply to the grid tied circuit is off without the main main supply circuit breaker to the house being tripped? 

Is it possible that the inverter turns off the municipal smart meter for short periods? The installation is in Lynnwood Pretoria and there is probably a smart meter installed on the municipal side.

Regards

Hi Vassen

The setup includes the 8kW Sunsync hybrid inverter, 20 x 325Watt PV panels [10 panels per string] and 5 x 3.6kWh Dyness batteries. 

Will send some pics of the setup. 

On 2021/01/06 at 9:02 AM, Vassen said:

Okay thanks but I was more looking at how it’s installed. Is your whole house on the inverter or only essential loads. Are you trying to feedback or not.  What type of smart meter do you have. 
 

As far as I know, with the meters that are sensitive, if they trip, you then need the municipality to reset it. This is just based on what I have read on this forum. My landis gyr meter hasn’t tripped and I sometimes feedback a little power unintentionally. 
 

I would like to see the system flow diagram as well as the system mode screens. 

The system feeds a backup circuit with all the plugs and lights and also a grid tied circuit with the non essential loads with excess solar power when available as well as 40% of the battery bank. 

It appears that a software update has resolved the issue of the inverter swit hing off the main supply to the house. 

But I am currently trying to resolve a trip every now  and then (intermittently) on the main supply breaker to house. This is also the point where my grid tied circuit connects to the grid, at the bottom of the CBI 63A main circuit breaker. I wonder if the main breaker trips because of the occasional backfeed from the inverter? 

Just now, BOEnergy said:

The system feeds a backup circuit with all the plugs and lights and also a grid tied circuit with the non essential loads with excess solar power when available as well as 40% of the battery bank. 

It appears that a software update has resolved the issue of the inverter swit hing off the main supply to the house. 

But I am currently trying to resolve a trip every now  and then (intermittently) on the main supply breaker to house. This is also the point where my grid tied circuit connects to the grid, at the bottom of the CBI 63A main circuit breaker. I wonder if the main breaker trips because of the occasional backfeed from the inverter? 

 

Just now, BOEnergy said: