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5kW Growatt ES upgrade to 8kW Sunsynk(need educated opinions)


li0n_za
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I recently got the following installed (system 1) -

  • 5kW Growatt ES
  • 2x Pylontech US3000C
  • 8x Canadian Solar 455W panels

Due to limitations on the Growatt (and having some extra cash and wanting to get the best system possible now) and overloading the 5kW a few times, I have decided to upgrade my system to the following (system 2.0) -

  • 8kW Synsynk
  • 4x Pylontech US3000C
  • 8x Canadian Solar 455W panels (will probably add to this at some later point, my north facing roof is filled with the 8 panels so I will need to add another array on the west roof or split then on E/W)
     
  1. Currently everything is connected to essential load, except my geyser and oven.  I was planning on moving the geyser to the essential side too, but it seems that with the Sunsynk and a CT coil this isn't necessary per se(would love some input on this)?
  2. Would it be recommended to keep the geyser, poolpump and oven on the non-essential side and power it with PV, limiting battery charge from PV during the times they run?
  3. Would it be better to rather drop 1 or 2 of the batteries and rather opt for more panels?
  4. Could someone explain the exact function of the CT Coil? I have done some light reading on this, but haven't found anything yet that explained it well enough for me.
  5. Should I rather consider the 5kW Sunsynk, considering I do have a few peaks of ~4.2kW per week without the geyser being run through the inverter.
  6. Is R165k incl installation for the above system(2.0) a good price (about R10k of this was fixing/replacing 2xDBs in my house, the state of which was a complete fucking shitshow)? Could I spend that in a smarter way to achieve the same goal? System 1 price was R100k, System 2.0 will add another ~R60k.

 

Some more info:

My current power usage is between 22 - 34 kWh per day, depending how long the pool pump (750w pump, 2hrs 3 times a week) and geyser (on timer and on only for an hour a day usually, unless hot water is needed at another time, then manual) is running.

Obviously the plan is to get my power usage from Eskom/City power as close to 0 as possible, so the idea is to charge batteries and run the geyser/pool pump during the day with PV and supply load to the house for the rest of the evening, and rinse repeat.

 

Input is greatly appreciated, I only really started learning about solar and stuff just before I got the initial system.  Every day I seem to read something new and want to change things.

 

 

Edited by li0n_za
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  • li0n_za changed the title to 5kW Growatt ES upgrade to 8kW Sunsynk(need educated opinions)

1. Yes this is not necessary. You want to keep the large non essentials as they are in the DB. 

2. Yes those seem like non essentials."limiting battery charge from PV during the times they run?"
The inverter will do this all on its own you just set some base parameters.

3. I would keep running the 2 batteries you have now and spend the cash on extra panels(as many as you can afford/fit on roof) . Add more batteries later .

4.The CT coil monitors the current flow from the grid side to your house or from your house to grid .
It monitors your exact usage from grid ,and your exact feed in to the grid if you are selling power.
Think of it as a gateway that allows power going one way or the other way or acts as n closed gate. depending on how you want to use it.
It will allow inverter to send power to non essentials up to the point of the "gate"(ct coil) where it is blocked, if you are using it in zero export mode.

5. I would go 8kw as it allows for more solar options and is a bit more future proof imo. I have the 5kw but would love the 8kw :D

6 .Cant comment on that ,other members here will have more experience with pricing.

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1 hour ago, Nexuss said:

1. Yes this is not necessary. You want to keep the large non essentials as they are in the DB. 

2. Yes those seem like non essentials."limiting battery charge from PV during the times they run?"
The inverter will do this all on its own you just set some base parameters.

3. I would keep running the 2 batteries you have now and spend the cash on extra panels(as many as you can afford/fit on roof) . Add more batteries later .

4.The CT coil monitors the current flow from the grid side to your house or from your house to grid .
It monitors your exact usage from grid ,and your exact feed in to the grid if you are selling power.
Think of it as a gateway that allows power going one way or the other way or acts as n closed gate. depending on how you want to use it.
It will allow inverter to send power to non essentials up to the point of the "gate"(ct coil) where it is blocked, if you are using it in zero export mode.

5. I would go 8kw as it allows for more solar options and is a bit more future proof imo. I have the 5kw but would love the 8kw :D

6 .Cant comment on that ,other members here will have more experience with pricing.

The reason I opted to go for the 2x extra batteries is because with my current 3.6kWp panels (peaking at around 2.8kWh currently) my batteries are fully charged by 12:30 and my load at that point is 500 - 800w. So I waste a bunch of generated power, thought the extra storage might offset this, as I can use it in the evenings then. Granted that is without the geyser or pool pump currently drawing from the PV.

 

Perhaps a happy medium would be another batterye and more panels for the balance of R17k?

Edited by li0n_za
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  • 2 weeks later...

I recently installed the 8.8kW Sunsynk Inverter with a 10.2kW BSL BATT Powerwall battery, with 20 x 415W panels and a Geyserwise Controller Kit with 4 dedicated panels...The system's running pretty optimally at the moment and if there was anything I'd add at this point, it'd be another battery.

@Nexuss' responses above are pretty much on point but from a personal user experience perspective, I'd suggest you upgrade to the 8kW Inverter and then add  more panels...

I run all my essential loads (incl stove in main house, swimming pool, stove in cottage, lights, fridges/freezers etc) using PV during the day directly just fine without any issues at all - that's just how great the SunSynk Inverter is at prioritising and managing loads (configured at installation of course). I'm peaking at about 6kWh during the day and it is only at night that my draw down on the battery is a bit aggressive. Thus for me, I'd invest in a second/parrel powerwall battery, but for your case, sounds like the above are first considerations...Upgrade Inverter and increase solar panels...

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