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Trojan TR105RE battery setting with Axpert 5KV Inverter


Bradley Reg
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Morning all.

 

Please Help with the following.

I would like to know what settings you guys think or know are best for the Trojan T105 RE Batteries. I have 2 sets of 8 in parallel giving you a total of 450 a/hr.

There are three inverters connected in parallel.

Attached are the specs of the battery.

I have the following settings.

05 = User defined.

02 = the master inverter and one slave is at 20 amps charging and the third inverter is at 10 amps giving a total of 50 amps charging. this giving a total of 11.11% charging Best between (10 and 13%)

12 = 47 volts

13 = Full

16 = OSO

26 = 58.4Volts

27 = 54.0 Volts

29 = 46 volts

 

I have now installed a BMV 702 as the inverter states that the batteries are not fully charged. The batteries are around 53.8 volts and the inverter says it only has 60 to 70 % charge capacity.

So I need to know what must I do to correct this scenario either by changing settings for the best.

With regards to the BMV I must still purchase a cable so I can see what the ICC software says.

 

If I have left any information unclear please inform me.

Regards

Bradley

 

 

 

 

 

 

 

 

T105RE_TrojanRE_Data_Sheets.pdf

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Hi Bradley , Welcome to the forum. 

Please download this file, its been uploaded by our Axpert Expert @Chris Hobson, and will give you a great idea of all the settings. 

47 minutes ago, Bradley Reg said:

I have 2 sets of 8 in parallel giving you a total of 450 a/hr.

I Have the same bank and allow a max Charge current of 45A (Your setting is also correct). I bulk charge at 59.3 and Float at 54. 

 

47 minutes ago, Bradley Reg said:

I have now installed a BMV 702 as the inverter states that the batteries are not fully charged. The batteries are around 53.8 volts and the inverter says it only has 60 to 70 % charge capacity.

Axpert is not accurate and does not count coulombs in and  out as the BMV does. Rather trust the BMV. May i ask, did you setup the Voltage, tail current and time to make sure your bank is @ 100%. Not setting this up, might prematurely indicate 100%

47 minutes ago, Bradley Reg said:

12 = 47 volts

I would prefer anything above 48V as 48volt roughly indicates 50%DOD depending on your load. 47 is to low.  

47 minutes ago, Bradley Reg said:

29 = 46 volts

If you reach 46 as a final cutoff, it means your battery's are really drained, and i guess you can only reach this point where grid is not available. @Chris Hobson, what is your recommendation here?

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5 hours ago, Bradley Reg said:

 

26 = 58.4Volts

27 = 54.0 Volts

I think it could be enough for an UPS System.

If the discharge ir bigger than 20% average, it is better to use Trojan specs. Also, soon or late, cells will be unbalanced and you´ll need to equalize, how will yo do it?

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22 minutes ago, Jaco de Jongh said:

switch off inverter to equalize.

The battery will have to be disconnected, not just turn off the switch. The switch is just a digital input to the processor. The DC-side capacitors will be voltage stressed if they are connected to more than 60 V for hours at a time.

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I have one question regarding the BMV, when you charge the batteries and it goes into float mode is that considered fully charged.

If I look at the Trojan specs and it states 50 volts is 80% capacity but when the battery gets to 50 volts the BMV states 85 to 88 % cant remember but this could actually be correct because as soon as you release the load the battery goes to a higher voltage.

 

The other thing with the Trojan batteries regarding such a high voltage to equalize, I phoned Trojan and spoke to the technicians there and they said the following (you set the absorption duration to 1.5 hours to 2 hours as the high voltage just enables the equalization to happen quicker but doing it at a lower voltage for a longer duration has the same effect.)

 

I have one other concern that I have just noticed. Inverter 1 is charging at 5 amps inverter 2 has battery discharge at -1 amps and inverter 3 has battery discharge at -2 amps, cant these units be set up so it just uses the PV and the batteries all get charged or discharged at the same rate. Inv 1 PV = 375.9 watts = 3 amps charging,  inv 2 PV = 53.7 watts 2 amps discharge, inv 3 PV = 161.1 watts = 0 amps charge or discharge. This is really confusing.

 

The new axpert 5KV/ inverters can now do equalization charge upto 64 volt.

 

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2 hours ago, Bradley Reg said:

I have one question regarding the BMV, when you charge the batteries and it goes into float mode is that considered fully charged.

My BMV is set up as follows, If it reaches charging current of equals to or less than 2.8% of the Bank capacity (12.6Amp) and a voltage of at least 53.8Volt for more than 30 minutes, it will report 100%. so a voltage of 54 alone is not enough to report 100%, its a combination of conditions to report that. 

2 hours ago, Bradley Reg said:

1.5 hours to 2 hours as the high voltage just enables the equalization

Equalization is not a timed event, it is complete when there is no more rise in the Sg (Specific Gravity) of the battery. The correct way is to do the equalization after the battery's has been fully charged. Take a reading and apply higher voltage than charge voltage. when the SG doesn't rise anymore, utilization is done. in some cases this might take 30 min, in others 3 hours depending of the state your batteries are in. 

 

2 hours ago, Bradley Reg said:

have one other concern that I have just noticed. Inverter 1 is charging at 5 amps inverter 2 has battery discharge at -1 amps and inverter 3 has battery discharge at -2 amps, cant these units be set up so it just uses the PV and the batteries all get charged or discharged at the same rate.

What I have experienced on parallel infinis are basically the same as what you said here.  If the battery's are depleted to such a stage where it takes absorbs the full amps, each inverter will do its part according to its setting. As the battery's charge and fills up it absorbs less amps so one inverter starts cutting back, later the second one will also till only one controls the last part of the charging. There is no way that i know of to ensure they share that load equally. I have tried everything on mine and had to learn to accept it. I dont think its got the intelligence to control it the way we would like it to charge. 

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4 hours ago, Jaco de Jongh said:

There is no way that i know of to ensure they share that load equally

Calibration. Once you get to constant voltage mode (aka absorption), whichever one is calibrated lower will work harder. This could be as little as 50mV. The one that measures 50mV lower will push the voltage up that extra 50mV. The other one sees a voltage that is 50mV above what it was aiming for, and since there is no potential difference to work with that unit stops charging.

I see this almost daily between my two MPPTs.

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14 minutes ago, plonkster said:

Calibration

On an Axpert? How?

The control philosophy of these Unit doesn't cater for sharing the load when it moves closer to fully charged, and one by one the units drop out completely and only one takes care of the tail current until it reaches basically 0. I know what you are suggesting, but don't think its that easy with anything Voltronic. This relates only to the charging side, the AC load gets shared very nicely although the charging current cuts back. 

From what I could gather from questions asked and answers recieved. 

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6 minutes ago, Jaco de Jongh said:

On an Axpert? How?

Oh no, I didn't mean to imply that this is something you can fix :-) It's how they come out of the factory. They are calibrated individually (usually) and no two units are exactly the same, no matter what you do. It doesn't matter either, once they get within a hundred millivolt of each other the work is basically done, and it doesn't really matter if some of the workers tjaila a little earlier :-)

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3 minutes ago, Bradley Reg said:

Morning Jaco, are you asking for the MPPT Voltage range - 60 - 115Vdc or where can I find the info.

Morning Bradley, sorry I wasn't clear in my question, I was referring to the input voltage rating of the MPPT. It will be on the label on the side of the inverter. Either 145 volt or I suspect in your case 450VDC.

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14 minutes ago, Jaco de Jongh said:

Morning Bradley, sorry I wasn't clear in my question, I was referring to the input voltage rating of the MPPT. It will be on the label on the side of the inverter. Either 145 volt or I suspect in your case 450VDC.

I have the older inverter so its still the 145 volt, before I purchased it I asked if it was the newer model and the response was yes but upon installation realized it was still the older model which was upgraded from 60 amps to 80 amps which they thought was the latest one and not the one that does equalization as well. 

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9 minutes ago, Jaco de Jongh said:

 

From setting 1 - 5

  1. Battery Capacity = 450
  2. Charged Voltage = 53.8
  3. Tail Current = 2.8%
  4. Charged detection time = 30min
  5. Peukert factor = 1.24

 

I had something like that and i realized there was a step from 95-96% to 100 before the calibration. Did you see something similar? I reduced Peukert to 1.215 and is more accurate.

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