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Deye Inverter 8Kw - Smart Load function


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Hi.  Anyone with experience in using the Smart Load function on the Deye / SunSynk inverters?  I have 5KWp PV but using on average under 2KW at any time during the day, so want to connect one geyser to the inverter using the Smart Load feature.  System is grid tied and works very well, but want to optimise the use of the 5KWp panels and 8Kw inverter!

Recommendations on any energy efficient geyer elements that I can use?  

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It is grid tied but not delivering to the grid as not enabled - Jhb CityPower does not buy excess power currently.

The SmartLoad function is programmed into the inverter and allows non-essential loads to be powered with excess power before selling to the grid (if it was allowed)

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As Justin says, the inverter is bidirectional and will push power to loads connected on the grid side of the inverter but you must have the CT sensor connected for this to work properly. 

Not sure if the screens but the should be an option for limit to load or limit to home. You want to activate the limit to home with zero export enabled. 

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Thanks Justin and Achmat:  Not sure what the CT sensor is but it is obviously configured to power just the household load.  There is definielty no export to grid as  I can see that the power generation of the PV matches the house load.  This is the excess capacity that I want to channel to a spare geyser

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I am still busy with my installation.  But I intend to put the whole house on the inverter (geyser included).  The big drawback is that the geyser draws a substantial portion of the available inverter load.

I am half way through building a smart switch for the geyser, talking to the inverter.  Basic logic will be:

1) when battery level below ~30% turn off geyser

2) when total inverter load above 7kWh, then turn off geyser until the total load has been below 3kWh for 15 minutes.

3) stretch goal  - add a geyser thermostat and add time of day rules to heat geyser to max while solar is available, and only keep it at a bare minimum otherwise.

This way the geyser effectively does not affect the total available inverter load.

At the moment, I am still working with Deye to implement the 'Island mode signal'.  Once that is sorted, I may ask them to consider implementing this as a Smart Load feature.

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Hi Justin, for interest does the current functionality of the smart load feature not have enough programmability "almost" to achieve what you want to do?  To my knowledge the smart load can be programmed to switch on and off based on the battery SOC and the power produced on panels.  e.g, you can program if the battery above 30% and solar power in excess of 4kw then smart load will switch on and could power your geyser.

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1 hour ago, Halcyon said:

Hi Justin, for interest does the current functionality of the smart load feature not have enough programmability "almost" to achieve what you want to do?  To my knowledge the smart load can be programmed to switch on and off based on the battery SOC and the power produced on panels.  e.g, you can program if the battery above 30% and solar power in excess of 4kw then smart load will switch on and could power your geyser.

Yup. Almost, but not quite...  I also want to turn the geyser off if the total load is too high. 8kW only goes so far...

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8 hours ago, JustinSchoeman said:

I am still busy with my installation.  But I intend to put the whole house on the inverter (geyser included).  The big drawback is that the geyser draws a substantial portion of the available inverter load.

I am half way through building a smart switch for the geyser, talking to the inverter.  Basic logic will be:

1) when battery level below ~30% turn off geyser

2) when total inverter load above 7kWh, then turn off geyser until the total load has been below 3kWh for 15 minutes.

3) stretch goal  - add a geyser thermostat and add time of day rules to heat geyser to max while solar is available, and only keep it at a bare minimum otherwise.

This way the geyser effectively does not affect the total available inverter load.

At the moment, I am still working with Deye to implement the 'Island mode signal'.  Once that is sorted, I may ask them to consider implementing this as a Smart Load feature.

@justinschoeman Not sure why you would need to do this as I understood the Smart Load function caters for most of this anyway.  It does not appear that it draws from the battery or grid, but only from PV and only when there is excess capacity.  Unfortunately there is no Deye material to explain this but perhaps SunSynk explain the operations better - they are basically the same inverter

There is a short YouTube video: 

 

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  • 1 month later...

After reading through this.. makes a whole lot of sense. Now the Magical question ... i have  a CT sensor with a  cable and the house has no provision for any extra cable (CT sensor twisted pair ) to be run to the DB board .
i know this is a long shot and possible . The CT sensor uses a 0v to 1000mv (1v) signal to measure amps .

Now if it is possible at all .. can i make this wireless . I wish Deye had done so . MAybe using to Arduino Nano boards and wifi units  ? Some one point me in the right direction I need to get this working but dread running a fresh cable . Trunking etc which can be done but time consuming .

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The is currently a fault with the smart load function it keeps on tripping.  They are fixing the firmware.

Deye 8kw The people that don't know which panels to use I can suggest Canadian Solar 365w 4 strings of 7 or 370w in the same config.

Deye 8kw. The flat roof stands 36 degrees facing North in Pretoria Sout Africa.
28 x 365w Canadian Solar panels Gif 10.220kw can also use 370w panels will give you 10.36kw that is under the 10.4 of the inverter and in the 18amp range.  the best so far had 16.7 amp although the panels are 9.18 amp each.

 

Bye the way if your meter have the sine at he bottom it can not turn back with grid tie.

20201006_121625-1 (1).jpg

IMG-20201019-WA0010 (1).jpg

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  • 3 weeks later...

I hade a issue with the smart load function on my Deye 8kw.  there were a firmware update  Wednesday 11/11/2020 and now there is not any issues.

In connection with the Geyser I will use a 2kw element on the geyser so if the is not enough power from PV so it do not drain yoyou must ur battery.  On the inverter you must enable the smart load function, where you also set the state of the battery when it must switch of if the is no grid.   The watt setting on smart load must bet set for a value bigger than your geyser element.

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  • 2 weeks later...
On 2020/08/27 at 7:28 PM, Vassen said:

The CT (current transformer) is a sort of a clamp that goes around the main utility feed. That’s what ensures that no power is fed into the grid. 
 

To use the smart load feature on a geyser, you would need some sort of automatic changeover switch that you can switch the geyser input power from the current connection to the smart load output of the inverter when there is excess power and then back to the current, when generation drops. 
 

if you know that your usage is around 2kw and your generation is double that, then it would be easier to install a geyser wise controller and set the thermostat to max during your period of excess solar generation, after battery has had time to charge, and set the thermostat to around 55 at night. Other option is to use for example a smart switch like a sonoff TH16 TOGETHER with a contactor to control the geyser. But I’m not sure how failsafe the sonoff is especially when it loses network connection. 
 

Like others have said, with the grid tied inverter, you are able to feed all the excess power to the grid side of the inverter into the rest of your house and the CT will stop power flowing back to the utility grid. 

Hi. I would like to know how does a CT stop power flowing past it? As far as I know current transformers are used to measure Amps flowing in a direction. 

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Thanks what I understand as well. I have a client where I installed a 8kw Deye inverter, he phoned me and said that he saw that he can send power back to the DB that's supplying the inverter with utility and power the loads that's not connected to the inverter and then u install the CT on the main utility supply to the house DB and it will block power going to the main grid. I have never heard of it. I know it's possible if you export back to grid you can power the loads in your DB but u have to open the main supply breaker and u will still be restricted to the inverters original 8kw output. 

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  • 4 weeks later...

I am expecting a 8kw Deye as well, as a current MPP user am hoping the experience will be better, especially with LFP charging. I like to get it's data to emoncms, is there a way to achieve this? Also the does it support mqtt?

Edited by ojeysky
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24 minutes ago, ojeysky said:

I am expecting a 8kw Deye as well, as a current MPP user am hoping the experience will be better, especially with LFP charging. I like to get it's data to emoncms, is there a way to achieve this? Also the does it support mqtt?

Another user in the post below created something for the sunsynk. The sunsynk and deye inverters are very similar. 

 

 

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