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Kodak Max 7.2kW Firmware Issue?


Don
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My Kodak Max 7.2kW has been up and running for about 12 days now. I have noticed two issues and wonder if it is only me that has the problem or is it a firmware issue?

1.) I am unable to charge the battery with solar energy and utility at the same time, although setting 16 is set to "SNU". As long as solar power is available, the batteries will only be charged by solar. It seem it is stuck in "CSO" mode. If my batteries are at say 80% SOC when the sun is setting, the batteries will only charge with solar. Only once the sun sets and solar disconnects, will batteries be charged with utility only. It is therefore only solar or only utility. I cannot get the batteries to charge with solar and utility at the same time. 

2.) Setting "01" is set to "Sub". (Solar energy provides power to the loads as first priority. If solar energy is not sufficient to power all connected loads, Utility energy will supply power to the loads at the same time). In my case all is fine until the load exceeds solar production, it will constantly draw 20 watt from my two Pylon U5000 batteries (10 watt per battery). My float voltage is set at 52.1V. The battery voltage will slowly reduce the battery voltage during this time until the load is reduced below solar production. Once that happens, there will then be a sudden inrush of power to the batteries to get them back to 52.1V within a minute or so. If utility is available, why draw power from the batteries in the first place? 

Firmware: U1 45.07, U2 12.10, U3 88.88

Does anyone with this inverter have the same problem?

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Exact same thing happened to me...

I had a RCT VMiii 5kVA inverter, on SUB setting it would be in bypass mode. One could call it "grid-tie" with "zero export" in Deye terms... But it would first send all solar to batteries and once charged up, "send" solar to "assist" loads... Something like that. I usually would set it to SUB on a cloudy day, knowing that the batteries would definitely be fully charged for night use and excess sun power would not be wasted...

Now I bought a Synapse 7.2M+, it's also a Voltronic Axpert MAX 7.2. Could not get it to charge the batteries on a cloudy day while loads were present. Tried all charge settings and all output settings, none worked unless load were less than what the sun could provide.

Please don't reflash anything yet, I currently have a 20kg brick mounted to the wall. I'm waiting for new firmware from the supplier, I've also ordered the Mecer branded RS232 converter from Takealot. My brainbox brand might be at fault (I hope). RS232 converter will arrive on Tuesday. I'll let you know if I got it working properly.

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On 2022/01/07 at 9:54 PM, Don said:

My Kodak Max 7.2kW has been up and running for about 12 days now. I have noticed two issues and wonder if it is only me that has the problem or is it a firmware issue?

1.) I am unable to charge the battery with solar energy and utility at the same time, although setting 16 is set to "SNU". As long as solar power is available, the batteries will only be charged by solar. It seem it is stuck in "CSO" mode. If my batteries are at say 80% SOC when the sun is setting, the batteries will only charge with solar. Only once the sun sets and solar disconnects, will batteries be charged with utility only. It is therefore only solar or only utility. I cannot get the batteries to charge with solar and utility at the same time. 

2.) Setting "01" is set to "Sub". (Solar energy provides power to the loads as first priority. If solar energy is not sufficient to power all connected loads, Utility energy will supply power to the loads at the same time). In my case all is fine until the load exceeds solar production, it will constantly draw 20 watt from my two Pylon U5000 batteries (10 watt per battery). My float voltage is set at 52.1V. The battery voltage will slowly reduce the battery voltage during this time until the load is reduced below solar production. Once that happens, there will then be a sudden inrush of power to the batteries to get them back to 52.1V within a minute or so. If utility is available, why draw power from the batteries in the first place? 

Firmware: U1 45.07, U2 12.10, U3 88.88

Does anyone with this inverter have the same problem?

All the latest Kodak Max Inverters that I have installed for my customers have the 90.28 firmware on them

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6 hours ago, Dirkie said:

All the latest Kodak Max Inverters that I have installed for my customers have the 90.28 firmware on them

But they didn't come from the factory like that, did they?

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22 hours ago, Dirkie said:

maybe the suplier install it before they shipped it out to us

Ah. So you didn't update it. I doubt that the supplier would do it, but if they did, top marks! 

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1 hour ago, Coulomb said:

Ah. So you didn't update it. I doubt that the supplier would do it, but if they did, top marks! 

I also doubt that the supplier wil do it it would be just to many work cause they import 100 to 300 at n time. We can login to there system and then we can see the stock on hand and the next shipment that will arrive.

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On 2022/01/11 at 9:58 PM, Dirkie said:

All the latest Kodak Max Inverters that I have installed for my customers have the 90.28 firmware on them

Hi Dirkie, do you know where I can find the 90.28 firmware?

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I updated the firmware to U1 90.28, U2 12.13. I cannot really tell the difference between 45.07 and 90.28. I still have the same issues. Once the load exceeds the solar production, there is a constant draw of 20W from my batteries and I am still unable to charge batteries with solar and utility simultaneously.

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2 hours ago, Don said:

I updated the firmware to U1 90.28, U2 12.13. I cannot really tell the difference between 45.07 and 90.28. I still have the same issues. Once the load exceeds the solar production, there is a constant draw of 20W from my batteries and I am still unable to charge batteries with solar and utility simultaneously.

As I understand is the 20w is the power that the inverter use to stay on and when you disconnect your battery then it wil start  pulling it from the grid. So it looks that voltronic just wants to bring out new inverters instead of fixing the bugs on the inverters that they already have don’t get me wrong I am a Axpert van but with the max I am starting to look at different inverters for my smaller clients.

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3 hours ago, Don said:

I updated the firmware to U1 90.28, U2 12.13. I cannot really tell the difference between 45.07 and 90.28. I still have the same issues. Once the load exceeds the solar production, there is a constant draw of 20W from my batteries and I am still unable to charge batteries with solar and utility simultaneously.

On my Axpert max 8kw its using 42w from battery

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8 hours ago, Don said:

I cannot really tell the difference between 45.07 and 90.28.

There are only 4 real bytes of difference, and you'll only notice the difference when in line mode.

It's in a complex part of the firmware, and I haven't had a chance to analyse exactly what the difference actually does.

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11 hours ago, Dirkie said:

So it looks that voltronic just wants to bring out new inverters instead of fixing the bugs on the inverters

Yes, it seems that way. They build an inverter with the functionality to charge from solar and utility simultaneously. Then they write firmware to activate the functionality once certain criteria are met. They are then supposed to test if it actually works. Obviously they have not done that. As long as the orders come in, they will supply inverters, irrespective if they are working 100% or not. They then rely on guys like @Coulombto fix their firmware for them and post patched firmware. 

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Good day

I accidently figured out what to do the get the batteries charged.......

Turns out USB setting must be used on the MAX inverters. USB setting on the MAX is the same thing as SUB on the VMiii.

2 nights ago I switched over from battery mode (SBU) to utility (SUB) as I planned to use the aircon and don't want it running from the batteries. I accidently put it on USB instead of SUB. The next morning it charged the battery as "first priority". 😂

The MAX is perfect, just a little feeding back to the grid, but I can live with that.

Overall I'm very happy now

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Hi Don

Im just guessing here.

Tell me quick how many panels do you have on and what size are they?
On the side of your inverter is a rating plate with a Mpp Voltage range of lets say 90-520V
A normal 380W panel has a voltage of 41V for example and the startup of that inverter is 90V
 

Maybe you voltage on the panels are to low to sustain the house and charge the batteries

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1 hour ago, MincePie said:

Tell me quick how many panels do you have on and what size are they?

I have 6 x 540W panels = 3 240W in total. 

1 hour ago, MincePie said:

On the side of your inverter is a rating plate with a Mpp Voltage range of lets say 90-520V

90Vdc~450Vdc

 

1 hour ago, MincePie said:

Maybe you voltage on the panels are to low to sustain the house and charge the batteries

No, on a sunny day, by 10h00 my batteries are fully charged. I have 6 more panels on order and should have them installed by next weekend. 

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1 hour ago, Jopie said:

If you need to charge batteries with solar and utility simultaneously, use option 1 - USB and option 16 - SNU. I just tested it, it works.

I changed my settings and you are right, it works! Now I don't have the constant 20W drain on the batteries when the load exceeds the solar production. What a relief, thank you very much @Jopie.

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1 hour ago, Jopie said:

The MAX is perfect, just a little feeding back to the grid, but I can live with that.

Luckily I have never had that problem.  

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@JopieThe "Usb" wording in the manual is wrong or misleading. When I read the description, I assumed solar will only be used if there is no Utility power available, which is not the case. 

Utility.JPG

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Hi @Don Setting #01 is to tel the inverter from what source it should power the load and setting #16 is to tell the inverter what to charge the battery with that is why the picture that @Jopie shared shows the utility is the only one powering the load but the utility and solar are charging the battery 

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6 minutes ago, Dirkie said:

Setting #01 is to tel the inverter from what source it should power the load

@DirkieNo, my batteries are fully charged and solar is powering my load right now with Usb setting. Only the shortfall coming from utility. 

 

solar.JPG

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