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AGM BATTERIES proper Setting Axpert 5KVA


Chris Dononion

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According to the datasheet of the CEIL POWERSAFE NXT batteries:

  • Bulk charge should be at a voltage of 14.5V - 14.7V per battery => 58V - 58.8V for the bank
  • Float charge at a voltage of 13.7V per battery => 54.8V for the bank

Axpert (voltage) settings

  • 05 - Battery type - USE
  • 26 - Bulk charging voltage - 58.4V (the maximum on the Axpert)
  • 27 - Float charging voltage - 54.8V

The current settings etc. etc. depends on your preferred way of charging, your set-up and your application e.g. 2000Wp worth of panels, off-grid, only charge via solar etc. etc. You'll have to elaborate on the rest of the system and your application in order for us to make more suggestions.

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Thank you so much for the information provided. ..... Slowly but surely I´m beginning to understand. :-)

 

Could I kindly ask for a couple of more settings ? 

 

01 SBU 

02 max charging current : 10Ah @the Moment

03 UPS

05 Use ( since your first message )

12 ? at the moment 47V

13 ? at the moment 47V

29 ? at the Moment 47

 

 I do have 12 x 235 Watt Yingli on the roof an Apex inverter 5KVA and 4 x NXT 100AH Batteries.

Had previously a 3 KW SMA Inverter, but COC  was not happy due to meter reversing........:o

 

kind regards 

 

Chris 

 

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16 hours ago, Chris Dononion said:

 

12 ? at the moment 47V

13 ? at the moment 47V

29 ? at the Moment 47

 

@superdiy has good settings above...

Axpert (voltage) settings

  • 05 - Battery type - USE
  • 26 - Bulk charging voltage - 58.4V (the maximum on the Axpert)
  • 27 - Float charging voltage - 54.8V

I would add:

12 = 48V

13 = 54V

29 = 47V

 

Regards

Mark

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1 hour ago, superdiy said:

@Chris Hobson, your input is required.

I did PM Chris D last night with my Axpert Guide.

I am happy with the setting as proposed by Mark and yourself. 

My own system the battery bank is undersized at 260Ah. Chris D's system is very similar in other respects to my system but his battery bank is even smaller than mine. A major drawback is that Chris D is limited to only 10A charging whereas on a good sunny day he has the potential to be producing about 45A. Chris D needs to probably micro manage his loads to gain the full potential of his investment. I have to manage my loads but it is easier with a larger battery bank. A battery bank of 400Ah + is probably what we should be aiming at.

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Thank you soooo much to all of you.

Im trying now all the settings and will monitor it.

 

If I could get rid of this set of batteries I would immedately buy myself a proper set of batteries..... but for now i have to live with it....... 

Once again guys,thank you for your assistance.... I owe all of you a beer or maybe two :rolleyes:

 

and if one of you hear of real bargain battery set....... please let me know.......... 

 

 

keep on harvesting the sun....... :D

 

regards Chris 

 

 

 

 

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This is the perfect topic and i would like to discuss a little more around settings 12, 13 and 29. 

PV Array: 2 strings of 2 x 305w Renewsys panels. A Total of 1220w, even though the highest the inverter recorded was 1280w. I've also seen a max of 23A on a good day. 

My setting values:

1 is SBU.

12 is 47v

13 is 55v

16 is CSO

26 is 57.2v (Bulk Charge)

27 is 54v (Float charge)

So lets assume a perfect day of sunshine for solar. During your previous night you managed to drain your battery bank to the point in setting 12. This then bypasses your load from battery to utility. Depending on setting 16, the battery bank will charge on either utility/solar, both or only solar or only utility; which ever option is selected, the battery bank is going to be charged. 

What i am noticing during the day is that when the battery bank voltage reaches setting 13, then it switches to battery mode again. What i want to know is at this point the battery bank is not at 100% SOC. Is solar expected to still take it to the Bulk charge state, if there is sufficient time and quality of sunlight?

This happened to me and i know later this evening i am going bypass to utility again. Is this a sign that my PV array is not sufficient to charge or just a case of a bad day of sunlight? 

Should i change setting 16 to SNU to help assist my PV array on a bad day of sunlight?

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Hi PurePower

If you are discharging your batteries to 47V that is roughly a 60% DOD = SOC of 40%. = roughly 5.5 kWh. You have 1.22 kW of panels and with an efficiency of 3.5kWh (the jury is out on this figure but I am sure it is a good ballpark figure especially with an Axpert). You can produce 1.22 x 3.5 = 4.27 kWh on an average day a little short and if you consider direct consumption during the day and some inefficiency probably a whole lot short..

Before you add another string:

  1. See if you can lower your overnight consumption  500W average is on the top end of what I would say is acceptable to be running off batteries..
  2. Do you really need to cycle your batteries? Batteries are fairly expensive and if I lived in the city I would just keep them for backup- running of solar during the day and Eskom at night.
  3. Get a BMV battery monitor as it is a far more accurate way of monitoring your batteries compared to the SOC readings supplied by an Axpert. Get Manie's software and know what your draw is and how your system is behaving.  I have often used the analogy that not having a decent battery monitor is bit like driving a vehicle without a fuel gauge. Not having decent monitoring software can be the equivalent to driving in the dark without headlights - you can do it but it makes your life very difficult. 
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14 minutes ago, Chris Hobson said:

Hi PurePower

If you are discharging your batteries to 47V that is roughly a 60% DOD = SOC of 40%. = roughly 5.5 kWh. You have 1.22 kW of panels and with an efficiency of 3.5kWh (the jury is out on this figure but I am sure it is a good ballpark figure especially with an Axpert). You can produce 1.22 x 3.5 = 4.27 kWh on an average day a little short and if you consider direct consumption during the day and some inefficiency probably a whole lot short..

Before you add another string:

  1. See if you can lower your overnight consumption  500W average is on the top end of what I would say is acceptable to be running off batteries..
  2. Do you really need to cycle your batteries? Batteries are fairly expensive and if I lived in the city I would just keep them for backup- running of solar during the day and Eskom at night.
  3. Get a BMV battery monitor as it is a far more accurate way of monitoring your batteries compared to the SOC readings supplied by an Axpert. Get Manie's software and know what your draw is and how your system is behaving.  I have often used the analogy that not having a decent battery monitor is bit like driving a vehicle without a fuel gauge. Not having decent monitoring software can be the equivalent to driving in the dark without headlights - you can do it but it makes your life very difficult. 

Thanks Chris H, this is my first solar install and learning something new every day.

I wanted to see how running off the batteries at night would work and how much utility energy i'll save. I am making a saving but i think it will be offset by the cost of replacing the batteries sooner. Clearly its becoming problematic to use batteries through the entire night and i agree batteries are expensive. I'm testing Manie's software on Windows at the moment and awaiting the delivery of my Pi and i'll configure it to use Eskom at night. Should it be configured for the entire night like from 5pm - 7am? or just part of the night when i am consuming power (5pm - 12am) as consumption beyond that time is so minimal...?

My long term plan is to get the BMV monitor. What is the model number exactly? BMV-702? and where do you recommend i buy it from?

Thanks again for the advice.

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40 minutes ago, PurePower said:

My long term plan is to get the BMV monitor. What is the model number exactly? BMV-702? and where do you recommend i buy it from?

Hi Pure Power

Yes a 702 and go for the mid-point probe rather than the temperature probe. There are other ways of measuring your battery temperature and the midpoint data is more valuable. Energy (Jay) PowerforumStore and Camel both have competitively priced units.

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20 hours ago, PurePower said:

Should it be configured for the entire night like from 5pm - 7am? or just part of the night when i am consuming power (5pm - 12am) as consumption beyond that time is so minimal...?

Perhaps  let your batteries discharge from  midnight to sunrise. As you say your power usage is minimal so you are getting some use out of your batteries. It also means you have some charging to do in the morning and so your panels will do a little charging and supply the load which makes better use of your panels. But this is a decision guided by your own personal preference with the caveat that discharging batteries heavily where grid is available does not make economic sense.

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  • 4 months later...

Could somebody please help with the following settings for my Axpert 5000Kva inverter:

  • 26 - Bulk charging voltage
  • 27 - Float charging voltage

I have 4 X 100Ah 12 Volt Schubart Solar batteries. I do not have the datasheets, but I have attached 2 photos

bat1.jpg.44e45b10e1d6a6eb48c5da0d7d5beb91.jpgbat2.jpg.cc690a21fb36b5e9f0d459febd76260c.jpg

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2 hours ago, TheOracle said:

Could somebody please help with the following settings for my Axpert 5000Kva inverter:

  • 26 - Bulk charging voltage
  • 27 - Float charging voltage

I have 4 X 100Ah 12 Volt Schubart Solar batteries. I do not have the datasheets, but I have attached 2 photos

 

Hi TO

Welcome

26 - 58 V

27 - 54.4 V

I tend towards the lower end of any voltage spectrum on VRLA batteries to minimise gassing.

 

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  • 1 month later...
9 hours ago, ibiza said:

Cable size is determined by the battery Amps. I use 50mm2 for 600A bank

Cable size is fixed by Inverter amps - for  Axpert 5 KVA at 48 Volts  miunimum 35 mm2 for short runs 1-2 meters or 50 mm2 for Longer runs .

See the attached BS standard cable ratings. remember to apply derating due to ambient  temp and cable configuration ( single , parallel, inside conduit etc) or use this simple calculator  http://www.energymatters.com.au/climate-data/cable-sizing-calculator.php?main_page=wire_calc&calc_action=cable_size 

 

for American sizes (AWG)- https://www.altestore.com/howto/wire-sizing-tool-for-12-24-and-48-volt-dc-systems-a106/

 

 

Current Ratings for conductors BS.pdf

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  • 5 years later...

Hi guys please can you help me with the settings I’ve got to setting no 12 but still not entirely shore I’ve got a mecer 5 kw 5 kva with 4 x 100ah AGM battery’s and 6 x 450 watt solar panels can anyone help with the best setting for this set up will be much appreciated 

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20 minutes ago, Teryne said:

Hi guys please can you help me with the settings I’ve got to setting no 12 but still not entirely shore I’ve got a mecer 5 kw 5 kva with 4 x 100ah AGM battery’s and 6 x 450 watt solar panels can anyone help with the best setting for this set up will be much appreciated 

Are you using the AGM default settings or the USR settings where you need to supply all the settings in a custom way? 

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