Kodak OG 7.2 inverter "switching off" Solar source when load exceeds charge

[BernardTomlinson]

Please help.

My kodak inverter is set to SBU as source priority.

Whenever the load exceeds the charge it switches over to Utility Mains and completely cuts off the Solar, as can be seen on the screenprint below. Sometimes it just keeps the solar charge disconnected, as can be seen on the second screenshot. I have to manually through the Mains circuit breaker off so that the solar charge can kick in. I do not understand why it does this.  Any one else maybe that has had this problem.    

[Steve87]

Hi Bernard, 

Menu option number 12 is the Voltage set point, that the Inverter will revert to Grid mode. I'm not sure which battery you have but this particular setting can cause what you describe above.

I will give you an example. Say you are running in SBU mode and have this voltage set to 51V. That means if a load is pulled from the inverter large enough and the battery voltage reaches 51V, that the inverter will change mode to Grid mode. This is how that Option 12 setting works. 

Please share us that setting value, it will clear up what seems to be a problem at the moment. 

[Steve87]

Further to the discussion. By you turning off the Mains supply, this helps because the inverter will then ignore that Option 12 value because there is no Utility or Grid source present. 

However, in this above scenario, the inverter will shutdown on the Menu Option 29 voltage setting. This is the DC cut-off voltage.

My calculated guess says that your option 12 setting needs a review. I may be wrong. Lets explore this one together, sure many a few ppl may have the same issue and not be aware of it. 

[BernardTomlinson]

Hi Steve,

Thanks for the prompt response.

My setting 12 is at 51V, and setting 29 at 44.0V

 

[Steve87]

Now when this switching takes place, is your battery not at 51V. To test the theory, set this to 48V & see if you get the same results. The continuous back to Grid mode.

[BernardTomlinson]

Set Menu 12 to 48V this ,morning already. Same result as before.

 

[Steve87]

What batteries do you have?

[Coulomb]

Also, what firmware versions, U1 and U2?

[Wurm]

Hi Bernard I had install a simular inverter,  with Columb help did i find a perfect setup for my system you can try it if you want to 

Prog 12 47v

Prog 13 49v

Prog  29 44v

[BernardTomlinson]

On 2022/05/02 at 3:02 PM, Steve87 said:

What batteries do you have?

Solarwize 5.6Kw 200Ah Lithium Iron

[BernardTomlinson]

On 2022/05/02 at 3:26 PM, Coulomb said:

Also, what firmware versions, U1 and U2?

Firmware Version 3.1.1.0

I have 8 x Jinko 545W Tiger Mono Facial 545W (144 cells) monocrystalline solar panels in 2 Series arrays. (2S4P)

 

[Coulomb]

10 hours ago, BernardTomlinson said:

Firmware Version 3.1.1.0

I think that must be the version of the Dess monitoring software. Inverter firmware version numbers will be two two digit numbers, probably separated by a dot, e.g. 45.02. There will be separate versions for the main Dsp version and the display firmware version.

[Richard Donkin]

Setting no. 41 on the Kodak 7.2kW inverters is for maximum battery discharge current. It looks to me like you need to increase that. This will allow more load to come from the battery, without switching over to grid power.