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Axpert problem


JAS1
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I have a new 3kva 24v inverter.reading through this forum,i am pretty sure that all the settings are correct.I only use it to power during load shedding a DSTV explorer,2x routers,1xflatscreen tv and maybe a 5w led light.The display when selected show in total less than 25% load in fact 175 watt with 6A discharging current,i use 2x 12v /120ah gel batteries(new) in series.My problem is it only supply power for 1 hour then code 4 comes on that means low battery power.And yes i have measured it with my multimeter and the batteries indeed measure =cut-off- voltage 21V .I have tested it with just the decoder and 2x routers on with tv off and no 5watt led light,just 1 hour and the same happen.Is there any body that experienced the same....would appreciate your comments and myane some sort of direction.I cannot believe that the batteries are faulty,what else could it be?

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Hi 

For the benefit of the Forum, could you share more on the specific batteries (make and type) with their Specs used.

Secondly post the Inverter settings - so we can see the mode, Charging and Floating Voltages, etc.

Keep well 

Jaco P

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6 hours ago, Jaco P Bloem said:

Thank you for the reply.

setting:

i only use utility ,now pv panels

01 - Utl

02  - 30A

03 - APL

04 - SdS

05 - ACn

06 - Ltd

07 - ttd

09 - 50Hz

11 - 30A

12 - 23V

13 - 27V

16 -CUt

18-60n

19 - ESP

20 - LON

22 - AOn

23 - byd

25 - FdS

26 - Cu 28.2

27 - FLu 27.0

29 - C0u 21.0

31 - 

Batteries= image.jpeg.8bdf3b79817076264a568bb1d69d23f9.jpeg

 

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I also forget to mention....The cable from the  batteries to inverter, I use as per spesicfication 22sq mm Cable,however both the positive and the negative cable goes through a 100A DC circuit breaker...could that maybe have a effect .

Edited by JAS1
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I'm not familiar with all the settings on this Inverter, but relating them to the 5kVa, they seem correct. I suppose setting 26 is the Charge Voltage which is fine at 2 x 14.1V. Also the float seem in order.

The cable size and circuit breakers are in order as long as there is no poor connection and the cables kept short.

If the installation and settings are in order, then it may be the battery quality. You should be able to cycle the 2 batteries to 50% (say 24.2V SOC) easily with a load of 175W (<6A) and this should take more than 2 hours. [In fact probably 75%, given they were sufficiently charged].

Can you ask support from the battery supplier, their opinion and perhaps they can do their own (load) test?

Regards!

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It may be that one of the battery modules is out of balance with the other. Check the voltage of each 12V module to see if they have a nearly identical voltage, within about 0.1V. If  not, charge the lower voltage module with a car battery charger, until the voltage (after resting at least a few minutes, preferably half an hour) is about the same. 

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  • 4 weeks later...

Good day all

Thank you all for the feedback.

No imbalance in battery voltage, it is within  .1V from each 

I just think i bought (although new) low quality batteries.

Just another question, can one connect 6 x 200Ah AGM batteries(wired so that it deliver 24V) to the inverter and expect it to keep it fully charged. Take note i only use utility power and not Solar panels. 

The AC Charger mode reads the following on the inverter:

AC Input:230AC,50Hz,17.7A

DC Output :27VDC,30A/20A

AC Output:230VAC,50Hz,13A

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2 hours ago, JAS1 said:

Just another question, can one connect 6 x 200Ah AGM batteries(wired so that it deliver 24V) to the inverter and expect it to keep it fully charged.

The AC Charger mode reads the following on the inverter:

DC Output :27VDC,30A/20A

So that would be 3 strings of two 12 V modules in series. So 600 Ah.

With a maximum charge rate of 30 A into the battery, it would take 600/30/2 = 10 hours to charge from 50% to 100% SOC (in practice a bit longer, since the current tapers off after about 80% SOC). That's doable, but perhaps marginal if you get frequent load shedding.

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