Good Day all

I have a conversol V7 ( I think it is a branded Axpert king) 5Kw inverter that I have replaced a faulty Axpert MKS 4 , 5.5 Kw with. After a lot of research on here I have the Bulk charge set to 52.5 V and the float to 50.5V and it seems to be doing fine. On inspection of the settings I noticed a Battery re-discharge setting that seems to be at 52.0V by default and I am wondering what this actual setting is for.

I have never heard of a battery re discharge voltage setting and it may be that it is a poor translation from chineese in the manual but I would like to know what the setting is for and if the current 52.0V setting is what it should be or not. If it needs to be lowered or raised I would like to know why and what effect the setting has on the use of the batteries and inverter.

As ever many thanks in advance

Regards

Bony999

1 hour ago, bony999 said:

Good Day all

I have a conversol V7 ( I think it is a branded Axpert king) 5Kw inverter that I have replaced a faulty Axpert MKS 4 , 5.5 Kw with. After a lot of research on here I have the Bulk charge set to 52.5 V and the float to 50.5V and it seems to be doing fine. On inspection of the settings I noticed a Battery re-discharge setting that seems to be at 52.0V by default and I am wondering what this actual setting is for.

I have never heard of a battery re discharge voltage setting and it may be that it is a poor translation from chineese in the manual but I would like to know what the setting is for and if the current 52.0V setting is what it should be or not. If it needs to be lowered or raised I would like to know why and what effect the setting has on the use of the batteries and inverter.

As ever many thanks in advance

Regards

Bony999

That is once the battery is low and you stop discharge and run loads from grid this will be the level that the inverter will start discharging the battery again instead of using grid. 

Hi Scorp007

I am on an off grid setup and have a backup of the grid for charging batteries overnight in low solar days of winter. The fact that the setting is 52.0V is my concern.

The battery re-charge voltage is 45.0v so this would be when they would start to re charge/use grid, or if no supply of solar or grid then shut the batteries off when the batteries got to this level.

Would the re discharge level then need to be set to 50.5V that I have for the float voltage? so that in the event I had grid power as a suppliment the batteries would provide power when they reached float voltage and therefore stop using the grid?

I think I have mentioned in a previous post that I am fairly new to solar etc and some of the terms do confuse me a bit. Your explanation makes sense to me if grid tied so I am assuming with the setup I have it is less of an issue as I dont use grid to power anything in the normal course of events.

I am grateful for the reply and if you can add anything to my previous assumption then please feel free to do so and; if I have misunderstood then let me know too.

Regards

Bony999

4 hours ago, bony999 said:

Hi Scorp007

I am on an off grid setup and have a backup of the grid for charging batteries overnight in low solar days of winter. The fact that the setting is 52.0V is my concern.

The battery re-charge voltage is 45.0v so this would be when they would start to re charge/use grid, or if no supply of solar or grid then shut the batteries off when the batteries got to this level.

Would the re discharge level then need to be set to 50.5V that I have for the float voltage? so that in the event I had grid power as a suppliment the batteries would provide power when they reached float voltage and therefore stop using the grid?

I think I have mentioned in a previous post that I am fairly new to solar etc and some of the terms do confuse me a bit. Your explanation makes sense to me if grid tied so I am assuming with the setup I have it is less of an issue as I dont use grid to power anything in the normal course of events.

I am grateful for the reply and if you can add anything to my previous assumption then please feel free to do so and; if I have misunderstood then let me know too.

Regards

Bony999

By setting to 52V you stay longer on the grid which means less saving but at 50.5V you risk extra cycles and if the get an outing from grid you have less battery power. 

20 hours ago, Scorp007 said:

That is once the battery is low and you stop discharge and run loads from grid this will be the level that the inverter will start discharging the battery again instead of using grid. 

Could it be the "back to utility bypass" voltage, Nr 12 in Voltronic rebrands settings? And "battery re discharge voltage" would be the "back to battery mode", setting Nr 13.

I set 12 to 47V, 13 to 50V (15 cells packs).

6 hours ago, Beat said:

Could it be the "back to utility bypass" voltage, Nr 12 in Voltronic rebrands settings? And "battery re discharge voltage" would be the "back to battery mode", setting Nr 13.

I set 12 to 47V, 13 to 50V (15 cells packs).

Correct. 

Hello Beat and Scorp007 and many thanks for the replies

 I have been intrigued by the terminology used in the manuals and I think I am now better able to see the logic of the two definitions provided. These settings will only become evident when and if I use the grid over winter to charge the batteries and supply power to the load. But at least I can see the logic of the two values.

Presently I have 13 set to 52.0V . I have the bulk set to 52.5 and the float to 50.5 my logic is that over winter, the batteries will be charged on cheap rate electric and then when they reach 52.0 the grid will stop charging the batteries but still power the loads until the end of the cheap rate period and then I can go back to solar and then battery for the load.

The really unfortunate issue is that I am going to have to fit a timer to the grid supply to come on and go of, coincident to the cheap rate period as the model doesn't have the same programable settings the Axpert MKS4 had for source priority. Have I got the right idea regarding the 52.0v value in respect of the grid no longer charging the battery or will it in fact just go to battery supplying the load once the value gets to 52.0V?

Thanks very much for the help in any case.

Regards

Bony 999

6 minutes ago, bony999 said:

Hello Beat and Scorp007 and many thanks for the replies

 I have been intrigued by the terminology used in the manuals and I think I am now better able to see the logic of the two definitions provided. These settings will only become evident when and if I use the grid over winter to charge the batteries and supply power to the load. But at least I can see the logic of the two values.

Presently I have 13 set to 52.0V . I have the bulk set to 52.5 and the float to 50.5 my logic is that over winter, the batteries will be charged on cheap rate electric and then when they reach 52.0 the grid will stop charging the batteries but still power the loads until the end of the cheap rate period and then I can go back to solar and then battery for the load.

The really unfortunate issue is that I am going to have to fit a timer to the grid supply to come on and go of, coincident to the cheap rate period as the model doesn't have the same programable settings the Axpert MKS4 had for source priority. Have I got the right idea regarding the 52.0v value in respect of the grid no longer charging the battery or will it in fact just go to battery supplying the load once the value gets to 52.0V?

Thanks very much for the help in any case.

Regards

Bony 999

You will have to provide the available settings for the priority. 

The manual do describe it clearly depending on priority used. 

When on UPS it will keep on charging until full. If on solar priority it should stop charging from grid at the 52V level IIRC. 

Hi Scorp007

Thanks for that. I have it on ups at the moment and solar only charging. In the winter I will change to the solar with utility for the night time charging. I must say it is all good fun this stuff but sometimes the terminology throws me out.

Many thanks for the help.

Regards

Bony999

Hi, I think the re-discharge value is for the scenario where the inverter turned off because it reached the critical low battery setting (the inverter turns off but if it has solar it will still charge the battery).  When the battery gets to the re discharge level the inverter will automatically turn on again.  

I think this setting is only on some of the Axperts (King for example) and not on the base off grid Axpert (wish it was...).

Hope that helps (and I am not 100% sure about this but got it from a solid source when looking for a setting like this on an Axpert 5k MKS)

 

2 hours ago, Hannes7212 said:

I think the re-discharge value is for the scenario where the inverter turned off because it reached the critical low battery setting (the inverter turns off but if it has solar it will still charge the battery).  When the battery gets to the re discharge level the inverter will automatically turn on again.

No, if the battery voltage goes below the cut-off voltage, the inverter goes off and will only come on again with a switch-on or solar appearing.

The re-discharge voltage is to recover from the battery voltage falling below the back-to-utility voltage, where the utility takes over supplying the loads if the battery was supplying the loads previously. When the battery voltage reaches this re-discharge level, it resumes powering the loads from battery, if you are in a suitable output source priority (e.g. SBU, with battery taking priority over utility for supplying the loads, B before U).