Good Day,

Please I need assistance. I have installed 2 x Kodak OG-Plus 5.48 (King) Inverters in parallel and connected to 4 x Lithium batteries in series (48V). The batteries are GEN2 LiFePO4 (LFP) Lithium 12.8V 230Ah Batteries (Specs attached). There are no solar panels connected to the inverters, just the grid and batteries & loads. The system is basically for backup only should the grid fail. Please find attached the LCD setting menu of inverters for assistance purposes & battery type and specs.

Could someone Please help me with the correct settings from 00-39. @Coulomb, could you also please shed some light on this subject as you are very knowledgeable. It will be much appreciated.

 

Axpert-KING-manual-NEW.pdf

11 hours ago, Pieter Maritz said:

Please help me with the correct settings from 00-39.

The battery specifications are confusing and inconsistent. For example, the first part says that the cutoff voltage for one module is 12.0 V, fair enough, but in the table below it says 12.8 V.

Setting 00 isn't a real setting.

Setting 01 depends on your preferences.

Setting 02 (maximum charge current) should be 60 A per string; since you have one string of modules, set it to 60 A.

Setting 05 (battery type) should be USE.

Setting 11 (maximum utility charging current) might as well be set to 60 A.

Settings 12 and 13 (back to utility and back to battery) depend on your preferences as well; while you have no solar, you might as well use something like 53 V and FUL respectively.

Setting 26 (absorb/bulk charge voltage) I would set to around 56.0 V. That's 14.0 V per module, and 3.5 V per cell, which is near enough to full, yet allows for some imbalance before 3.6 VPC is reached.

Setting 27 (float voltage) I would set to 54.0 V (13.5 V per module).

Setting 29 (low DC cutoff voltage) is tricky. I would use 48.0 V (12.0 V per module). Hopefully there is a BMS in there to disconnect the load when any cell voltage gets too low.

All other settings can be left at defaults, or fiddled later without affecting the health of the battery. You should not be bothered by the premature float bug while you are only charging from utility. So no need for timed absorb or equalising (settings 32-39). 

Hi all, Solar noob here and thought my question fits into this topic.

I need guidance on what setting 12 and 13 means, the "back to grid" and "back to discharge" settings. 

1. From my understanding if back to grid is set to 47v the and if the batteries reaches below 47v Inverter will start charging from utility (if it is there)

2. Back to Discharge I actually have no idea. It is set to 53v. 

3. What happens if system is in between 47v (back to grid) and discharge (53v). Charge from solar or batteries or both?

4. What happens if system is in above 53v discharge (53v)?

Thanks!

5 hours ago, TheFran42 said:

Hi all, Solar noob here and thought my question fits into this topic.

I need guidance on what setting 12 and 13 means, the "back to grid" and "back to discharge" settings. 

1. From my understanding if back to grid is set to 47v the and if the batteries reaches below 47v Inverter will start charging from utility (if it is there)

2. Back to Discharge I actually have no idea. It is set to 53v. 

3. What happens if system is in between 47v (back to grid) and discharge (53v). Charge from solar or batteries or both?

4. What happens if system is in above 53v discharge (53v)?

Thanks!

1.   It depends if you have set setting 16 to charge from solar only, or from grid, or from both. The setting that you mention mean while the battery is discharging once it gets to 47V it will stop discharging and use the grid for the loads. 

2.   This means if setting 16 allows charging from grid it will continue powering loads from grid and charge the battery up to 53V before it will start to power loads from battery again. 

3.   Between these 2 levels it will charge based on setting 16. Read the conditions for solar and/or grid charge in the manual. 

4.   Above 53 it will use battery to power the loads as per answer in 2.