Sunsynk query - splitting of the loads

Snyper564

Snyper564

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Power forum might be a better place to pose this but I feel like there are more than enough ppl here running sunsynks or with sufficient knowledge to help and I dont feel like opening another account :p

So I am aware that I can split essential and non-essential loads.

The non-essential load being the load that will essentially be non-existent when there is no grid power.

So I do a bit more research and I understand that I can prioritize the battery being charged and also the essential load being powered by the PV etc.

I also understand that should the battery be full (for example) the essential side being powered and there being excess power that the additional power can power the rest of the house -> now is the rest of the house considered non-essential or aux, or are these terms the same thing?

I dont know if I am going mad and confusing terms for the sunsynk >_<

Maybe to give a little more insight the proposed system is as follows (I am aware as I mentioned in the past that its over specd want to "future proof it")

System should be able to generate around 42Kw (6.5hX535wX12panels) even if we take 50% of that its 21KW a day.
Inverter will be the Sunsynk 8Kw version.
Batteries will be 2 x 5.5kw am2 Hubbles.
My current summer consumption is 12KW winter consumption goes to around 18KW, most consumption takes place during the day.
Geyser is on evac tubes but powered by a 3Kw element when it needs to "top up" currently used early morning and early evening. The morning is typically the only time it really needs to "top up".
Oven is a Defy 2.5Kw and induction stove is 7.5kw when all on, on max and 1.75kw when one point is in use. Stove and oven are one point on the DB. (Might change this to gas in the future - but not exploring this as part of this current discussion)

I wanted to do the split as follows, lets start with the essential side and the questions I have:

Essential load - Entire house - excluding geyser, stove and oven.

1. Is my understanding correct that aux and non-essential are the same thing?

2. I am happy for the batteries to supply the stove/oven/geyser till the battery hits say 70-80% then these must be powered by the grid as I want all the essentials to be covered by the batteries.

Essentially if the battery is 50% and the geyser needs to be topped up 4am it will just pull from the grid (assuming its available), if it is over 90% it will draw down till the battery hits the 70-80%.

I am assuming this is possible?

3. Can I split the stove from the oven on the DB board to place it into the essential load as it typically wouldnt need more than 2kw a day?

TLDR

I want excess PV power to power the geyser, oven and stove when available and 30% of the battery to be allocated to these loads when there is no PV generation what is this "load" called :)

Sorry for the essay just want to make sure my ducks are in a row.
 
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Presume you are talking about kWh?
The 12 is 12volt for 6.5 hours but what is the 535?
 
1. Is my understanding correct that aux and non-essential are the same thing?

No. The sunsynk has 3 connection points.
1. Grid input/output. This is a bidirectional connection where the grid connects to the inverter. You can connect loads before this and these will be considered non essential loads. You can supply these loads from pv or battery but only when the grid is available. If the grid is down then these loads will not be powered.
2. Load connection. This is the primary ups load connection or essential loads.
3. Configurable aux connection. This can be configured as an additional output to dump excess power such as for a geyser. Depending on settings it can be a secondary non essential output that will still be powered even during load shedding. It can also be used as an input for a genealoë or a micro inverter.

2. I am happy for the batteries to supply the stove/oven/geyser till the battery hits say 70-80% then these must be powered by the grid as I want all the essentials to be covered by the batteries.

Essentially if the battery is 50% and the geyser needs to be topped up 4am it will just pull from the grid (assuming its available), if it is over 90% it will draw down till the battery hits the 70-80%.

I am assuming this is possible?

Only if you put the on the aux and not before the inverter.

3. Can I split the stove from the oven on the DB board to place it into the essential load as it typically wouldnt need more than 2kw a day?

This is possible. Stove should be on its own circuit breaker already.
 
AchmatK said:
1. Is my understanding correct that aux and non-essential are the same thing?

No. The sunsynk has 3 connection points.
1. Grid input/output. This is a bidirectional connection where the grid connects to the inverter. You can connect loads before this and these will be considered non essential loads. You can supply these loads from pv or battery but only when the grid is available. If the grid is down then these loads will not be powered.
2. Load connection. This is the primary ups load connection or essential loads.
3. Configurable aux connection. This can be configured as an additional output to dump excess power such as for a geyser. Depending on settings it can be a secondary non essential output that will still be powered even during load shedding. It can also be used as an input for a genealoë or a micro inverter.

2. I am happy for the batteries to supply the stove/oven/geyser till the battery hits say 70-80% then these must be powered by the grid as I want all the essentials to be covered by the batteries.

Essentially if the battery is 50% and the geyser needs to be topped up 4am it will just pull from the grid (assuming its available), if it is over 90% it will draw down till the battery hits the 70-80%.

I am assuming this is possible?

Only if you put the on the aux and not before the inverter.

3. Can I split the stove from the oven on the DB board to place it into the essential load as it typically wouldnt need more than 2kw a day?

This is possible. Stove should be on its own circuit breaker already.
Click to expand...
Thanks for this.

Just to confirm my understanding is correct.

The essential load is placed on (2) load connection and based on my preferred usage of the batteries of 30% the Geyser, stove and oven will be placed on aux (3)

Should 30% be exceeded and there is no grid power aux will also go down.

This correct?
 
Snyper564 said:
Thanks for this.

Just to confirm my understanding is correct.

The essential load is placed on (2) load connection and based on my preferred usage of the batteries of 30% the Geyser, stove and oven will be placed on aux (3)

Should 30% be exceeded and there is no grid power aux will also go down.

This correct?
Click to expand...
Correct. Not sure of what the exact settings needs to be as I have my whole house on the essential side.

Your system should able to handle this. My typical usage pattern. I have 14kWh of pylontech batteries. When they geyser switched on for the morning showers then the SOC drops to the cutoff level in a few minutes. I need 2 more batteries for these two hours until the sun comes up.

Screenshot_20211002-153637_SOLARMAN%20Smart.jpg
 
AchmatK said:
Correct. Not sure of what the exact settings needs to be as I have my whole house on the essential side.

Your system should able to handle this. My typical usage pattern. I have 14kWh of pylontech batteries. When they geyser switched on for the morning showers then the SOC drops to the cutoff level in a few minutes. I need 2 more batteries for these two hours until the sun comes up.

View attachment 1158546
Click to expand...
Thank you very much for this confirmation.

I guess if I wanted to hypothetically have a full "pseudo essential" house to see if I could actually push it is maybe set the SOC to perhaps 30% for example and if the aux load kept pushing it to the max pop it back up to 70% for example.
 
Snyper564 said:
Thank you very much for this confirmation.

I guess if I wanted to hypothetically have a full "pseudo essential" house to see if I could actually push it is maybe set the SOC to perhaps 30% for example and if the aux load kept pushing it to the max pop it back up to 70% for example.
Click to expand...
If you're not expecting load shedding or a power outage you can probably push the minimum SoC a bit further.
 
Speedster said:
If you're not expecting load shedding or a power outage you can probably push the minimum SoC a bit further.
Click to expand...
I definitely think this is a really good approach keep those items on aux and keep SOC on the lower end till load shedding etc is an issue again - make the most of the power savings.

Then when load shedding is an issue bump the SOC up, pull out the gas hob and let the evac tubes do their job.

All boils down to a little more hands on power management which I can live with.
 
Bit of a thread necro here, but wanted to check if you are able to see the power drawn by your non-essential loads? i.e. if you compare the "grid power" and "grid CT power" readings can you see a difference when the geyser or oven is on?

I'm trying to make sure that my installer has done this properly, but at the moment, my grid power and grid CT power readings are basically identical.
 
RoganDawes said:
Bit of a thread necro here, but wanted to check if you are able to see the power drawn by your non-essential loads? i.e. if you compare the "grid power" and "grid CT power" readings can you see a difference when the geyser or oven is on?

I'm trying to make sure that my installer has done this properly, but at the moment, my grid power and grid CT power readings are basically identical.
Click to expand...
Can you send an image from the screen where it shows the power being produced or used by all the items on the inverter?
 
I can, but unfortunately we are loadshedding right now! What exactly are you looking for?
 
RoganDawes said:
I can, but unfortunately we are loadshedding right now! What exactly are you looking for?
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The power going to the non-essentials will be clear as its the power going to the house icon
 
I have no house icon? Does this suggest that the inverter is incorrectly set up, somehow?

And the oven was on. Inverter is an 8kW Sunsynk.
 

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RoganDawes said:
I have no house icon? Does this suggest that the inverter is incorrectly set up, somehow?

And the oven was on. Inverter is an 8kW Sunsynk.
Click to expand...
Put the oven on and take a screenshot. Also why is aux showing load of 2W, do you have something connected to it?
 
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