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Axpert Settings 26 and 27


Gunners
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Hi All.

Need some assistance with a few settings for my Axpert for my lead acid batterie please. Settings 2,11,26,27 and 29 in particular please.

My battery specs are:

image.thumb.png.96dc940bcfd618c521c40f8cf0008b35.png

Connected as follows:

image.png.3ef8a19485b322bdf0fcade207cec84e.png

I have ICC connected, but no battery management system, so I understand the settings might not be accurate ... but any expert advice is appreciated.

Also, I have seen the guide from Chris and other recommendations in this forum and settings mentioned generally are for program settings 1 - 31. I am running firmware 74.40e and there are settings up to 39. Any advice on settings from 32 - 39?

Thanks!

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On 2021/02/03 at 6:17 PM, Gunners said:

Need some assistance with a few settings for my Axpert for my lead acid batterie please. Settings 2,11,26,27 and 29 in particular please.

Hmmm. They don't say what voltage to charge them to. It looks like these are designed to be float charged all the time.

In the absence of better information, I'd use the lead acid defaults, i.e. 56.4 V for setting 26, 54.0 V for setting 26.

For setting 02 (maximum charge current), use 0.4 x the nominal battery capacity in Ah (you didn't say, and I can't read it from the photo). So if these are 100 Ah modules, use 40 A maximum charge current.

Setting 29 is tricky in the presence of frequent load shedding. You'd like to leave it fairly low, for as much run time during blackouts as possible. But you need to leave it fairly high for decent battery life. I would use about 48 V, but you can adjust that to try and stop discharging at about 50% SOC. Note that the inverter's SOC indication is not very reliable. It would be good to install a Victron BMV or similar to know where your battery capacity really is at.

On 2021/02/03 at 6:17 PM, Gunners said:

I have ICC connected, but no battery management system, so I understand the settings might not be accurate ... but any expert advice is appreciated.

You don't need battery management for lead acid, though battery module balancers seem to be a good idea.

On 2021/02/03 at 6:17 PM, Gunners said:

Also, I have seen the guide from Chris and other recommendations in this forum and settings mentioned generally are for program settings 1 - 31. I am running firmware 74.40e and there are settings up to 39. Any advice on settings from 32 - 39?

The higher settings are for things you don't need, like equalisation (only for flooded batteries). Just leave them at defaults.

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Hi Coulomb ... many thanks for the input!

21 hours ago, Coulomb said:

For setting 02 (maximum charge current), use 0.4 x the nominal battery capacity in Ah (you didn't say, and I can't read it from the photo). So if these are 100 Ah modules, use 40 A maximum charge current.

 

They are 170Ah batteries, which equates to 68 as per your formula. I will change setting 2 to 60a then and the others as per your recommendation.

Regards

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