Grounding Deye 8kw Hybrid inverter

xuhaibkhan · Jul 20, 2024

I have daye 8kw hybrid inverter with 48100b1 battery in case grid goes offline.

The installation company drilled two 50feets holes 30feet apart from each other and added copper pipe and told me these are AC and DC earthing.

They added a lighting arrester at roof as well, and installed two separate DB boxes and told me one is AC and one is DC.

I have learned a lot from here and found out they they did not installed the CT at main home incoming cable from grid and just added in inside the Deye connection box, also the batter sensor was there so I moved them both to correct places, while doing so I got a jolt/shock when I accidentally touched the inverter heat sink. ( please note I am not professional, I am just learning so I have very limited knowledge) upon checking I saw that there is a ground screw option on inverter and also on battery which are not connected anywhere.

So my question is that where to connect the inverter heat sink ground and battery ground , to the AC ground or DC ground. ( The installation company are just not helping)

FilterGuy · Jul 20, 2024

Could you provide a diagram of the system?

LydMekk · Sunday at 7:31 AM

So no PV solar panels?

xuhaibkhan · Sunday at 12:21 PM

FilterGuy said:
Could you provide a diagram of the system?

I can take pictures of system , but I am no clue about the wiring.

They have installed Jinko 585w x 18 panels on roof with a lighting arrester and then the wire comes down to the inverter , and they have two copper ground rods and told me one is for AC earthing one is DC.

FilterGuy · Sunday at 12:22 PM

xuhaibkhan said:
and they have two copper ground rods and told me one is for AC earthing one is DC.

That is concerning. Do you know where each ties into the system?

xuhaibkhan · Sunday at 1:21 PM

FilterGuy said:
That is concerning. Do you know where each ties into the system?

Yes , I can see one attached to DC SPD and other in AC SPD.

FilterGuy · Sunday at 3:20 PM

xuhaibkhan said:
Yes , I can see one attached to DC SPD and other in AC SPD.

That sounds wrong.

All the grounding electrodes should connect at the point of first disconnect from the grid. All the EGCs should go out from there.

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xuhaibkhan · Sunday at 3:26 PM

This is how it seems it is , I don’t have limiter instead have bidirectional meter so excess can be sold to gird , also the inverter is of Deye. But the inverter and battery earthing points aren’t connected anywhere.

FilterGuy · Sunday at 6:13 PM

xuhaibkhan said:
View attachment 230231
View attachment 230233
This is how it seems it is , I don’t have limiter instead have bidirectional meter so excess can be sold to gird , also the inverter is of Deye. But the inverter and battery earthing points aren’t connected anywhere.

Grounding the panels to earth separately is 1) not to code and 2) a terrible idea. See below.

There are three items I am not sure about.
1) Is the black box an energy meter? What is it used for? Is this system on some type of power purchase agreement?
2) What is a TDS? I know what it is in today's politics but not in this context. ( I am TLA challenged )
3) The post indicated there is no 'Limiter' but a limiter is shown. Is that indicating CTs clipped around the wires going to the meter?

xuhaibkhan said:
I have daye 8kw hybrid inverter

The back-feed current is limited by the 120% rule and an 8K inverter may be too large to back-feed into the main breaker panel.
120% rule: The 125% of the backfeed current can not be greater than 120% of the panel busbar rating minus the main breaker rating.

* Is the panel a 200A panel with a 200A main breaker?
* What is the Busbar rating of the main breaker panel?
* Do you know if the installer did a 120% rule calculation for the backfeed?

If the panel has a 200A main with 200A busbars then:
Backfeed Current x 1.25 must be less than (200Ax1.2 - 200A = 40A)
That means the max backfeed current must 40A/1.25=32A or less

An 8K inverter can back-feed a continuous 8000/240=33.33A

FilterGuy · Sunday at 6:16 PM

BTW: Do you really have Li ion cells or are they LiFePO4 cells? Is there a BMS?

xuhaibkhan · Monday at 5:03 AM

My Bad I should'nt have taken an image from online to epxlain. I have edited and made a correct diagram of how my current setup is.

The yellow earth signs (highlighted with red arrows) are not connected anywhere; one is on the battery, and the other is on the inverter.

On the inverter heatsink, at the back, where I have added the yellow lightning sign, I received a shock/jolt when I touched it accidentally.

The green earth points have separate cables and go to different ground copper rods, which are exactly 15 feet apart; they are not connected to each other, and installation company told me one is AC earth (Right), and other is DC earth(Left)

I asked a local electrition, and he said to connected battery and inverter earth to AC (Right-side) Earth

xuhaibkhan · Monday at 5:21 AM

FilterGuy said:
BTW: Do you really have Li ion cells or are they LiFePO4 cells? Is there a BMS?

I have this ESM-48100B1 battery, which doesn't have an option to be connected directly to the inverter, so I am using it in voltage mode. It has its own BMS, but it can't be monitored without a separate battery monitoring module. I found out in this forum that it's a 15S battery, and the installation company set up incorrect float and other settings. However, with the help of experts in this forum, I was able to fix those.

xuhaibkhan · Monday at 5:30 AM

FilterGuy said:
Grounding the panels to earth separately is 1) not to code and 2) a terrible idea. See below.
View attachment 230266
There are three items I am not sure about.
1) Is the black box an energy meter? What is it used for? Is this system on some type of power purchase agreement?
2) What is a TDS? I know what it is in today's politics but not in this context. ( I am TLA challenged )
3) The post indicated there is no 'Limiter' but a limiter is shown. Is that indicating CTs clipped around the wires going to the meter?

The back-feed current is limited by the 120% rule and an 8K inverter may be too large to back-feed into the main breaker panel.
120% rule: The 125% of the backfeed current can not be greater than 120% of the panel busbar rating minus the main breaker rating.

* Is the panel a 200A panel with a 200A main breaker?
* What is the Busbar rating of the main breaker panel?
* Do you know if the installer did a 120% rule calculation for the backfeed?

If the panel has a 200A main with 200A busbars then:
Backfeed Current x 1.25 must be less than (200Ax1.2 - 200A = 40A)
That means the max backfeed current must 40A/1.25=32A or less

An 8K inverter can back-feed a continuous 8000/240=33.33A

The installaion company installed 18 panels of (https://solarshop.baywa-re.lu/Jinko-Solar-Tiger-Neo-585W-Ha-31-117803) and made two PVs (9each) and connected it to inverter.

Also I have Bi-directional meter installed, and so far I have Imported(Buy)1500Kw/h and Exported(Sell) (1700Kw/h)
The gird is available for 22hours a day, and my load is 2Kw/h minimum and with air conditioning it gets to 4.5Kw/H, rest is sent/sold to grid so I can use it after the sunset.

I am not sure if they did any math, because I am learning here that they have made alot of mistakes, installed sensors and CTs at incorrect places, and did not setup the correct settings at all.

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