OG10 and FL 5.2 batteries compatible?

[Mako]

Very strange behavior on an OG10/FL 5.2 system. Two FL 5.2 are connected in parallel to a single OG 10. When battery type is set to Kodak the reported consumption overnight with minimal load is three or four times higher than expected via Watchpower. When set to User and battery parameters entered the overnight consumption on Watchpower shows 90% which is more or less expected but the battery level lights show 40%-60%.

Is there later firmware that allows FL 5.2 selection in the battery menu maybe?

Is anyone running an OG 10 and FL 5.2 batteries sucessfully? 

Edited May 15, 2024 by Mako
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[Steve87]

Watchpower is a very poor place to look as a good judgement of % SoC. In User settings the % you see on watchpower is a guestimate by the inverter & then displayed on watchpower. In Pylontech mode or whatever mode the FL2 uses for option 5 on the Kodak that will give the true BMS derived SoC & this will be the correct value on watchpower when this option 5 is setup for the Battery BMS Comms. 

Use settings will never give an accurate % SoC. 

[McKracken]

Just for the record, Mako and I are talking about the same installation.

When using the 'Kod' (Kodak) settings in parameter 5 the SoC displays matches the batteries LED indicators. The problem comes after a night of running on battery power, the SoC has dropped significantly more than expected. 

I ran a test with only a geyser element running for 3 hours, and the batteries lost 7.4752kWh, while the geyser consumed 6.51 kWh- a difference of 962Wh
The inverter won't be drawing 320W and all the other breakers were tripped 

the USE settings are being run with the battery sticker values at the moment as an alternative (but the SoC is more or less meaningless) it would seem that the USE settings are utilising more of the battery capacity, however the Battery LEDs are still showing lower than they should after a night. 

 

[Scorp007]

5 hours ago, McKracken said:

Just for the record, Mako and I are talking about the same installation.

When using the 'Kod' (Kodak) settings in parameter 5 the SoC displays matches the batteries LED indicators. The problem comes after a night of running on battery power, the SoC has dropped significantly more than expected. 

I ran a test with only a geyser element running for 3 hours, and the batteries lost 7.4752kWh, while the geyser consumed 6.51 kWh- a difference of 962Wh
The inverter won't be drawing 320W and all the other breakers were tripped 

the USE settings are being run with the battery sticker values at the moment as an alternative (but the SoC is more or less meaningless) it would seem that the USE settings are utilising more of the battery capacity, however the Battery LEDs are still showing lower than they should after a night. 

 

What size of geyser element have you got? 

I presume you did not check if the geyser element was heating the whole 3 hrs? 

I would take a flyer without knowing the battery or it's BMS that the battery LEDs are perhaps the more accurate SOC. As Steve indicated the USR setting will not be accurate. 

Edited May 15, 2024 by Scorp007

[McKracken]

29 minutes ago, Scorp007 said:

What size of geyser element have you got? 

I presume you did not check if the geyser element was heating the whole 3 hrs? 

Its a 2kW element which the inverter reported as running at 2.16 to 2.17 kW, I assumed 2.17 for the entire duration, it ran continuously as the geyser was cold at the beginning, and the data from the app confirmed it ran non stop for the 3 hrs exactly. 

Edited May 15, 2024 by McKracken
Spelling

[TaliaB]

8 hours ago, McKracken said:

I ran a test with only a geyser element running for 3 hours, and the batteries lost 7.4752kWh, while the geyser consumed 6.51 kWh- a difference of 962W

High-quality inverters can typically convert DC to AC with an efficiency rate of around 85-90%, however there might be energy losses due to heat, wiring, and other electronic components. 

 

[McKracken]

Update - After getting hold of Solar Assistant and the right cables to see the data from the battery BMS it turned out that the BMS was reporting a decreased capacity by over 12% on each battery. The cycle counter was at 94 and 89 on the 2 batteries. They are 100Ah units.
To read the BMS data  I had to run the inverter on USE (user) battery settings as the comms don't work to Solar Assistant and the inverter at the same time. I started by using the sticker values for the battery settings and found that when the BMS reported 5% SOC it ran like that for a long time, much more than it should have, then after charging up the battery the BMS reported it's capacity had returned to 98%. 
I tested each battery one at a time and they both behaved the same. It looks like there is a bit of a quirk in the BMS capacity calculation.
Once the battery was charged the capacity dropped but the charge stayed constant resulting in over 100% charge, so it seems the BMS is reducing the capacity number which was giving me a larger loss than expected based on the SOC reported by the inverter when communicating with the BMS.

I am going to look into updating the battery firmware in the meantime. At the moment I am running the battery on user settings, but have matched what the KOD (Kodak) values were as they auto populated the parameters. 

Here are some screenshots for those interested

After a full discharge and during charging capacity increased from 89 to 95.9%

After charging the same battery it showed  97.9%

 

and I let it sit overnight, the BMS reported capacity dropped to 88.9Ah but the charge didn't: