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Please help me change/fix/replace my solar setup.


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Posted (edited)

Good day all, 

So I have the following:

3kv Axpert clone 24v

4x canadian solar 350watt panels

victron bmv-712

victron battery balancer

raspberry pi running icc software

 

Forget the batteries, I’ve gone through 4 of them because of wrong settings or float bug issues, all was agm batteries. 
 

So I’m looking at getting a pylontech, but the only 24v option is the up2500. Is this a good option, and then where do I start with the correct settings because of the float bug?

I only need around 600w backup for max 4 hours. 

So, what is the best way to put all this together, or should I scrap the axpert clone and go 48v?

 

Any advice welcome,

Thanks!

Dion

Edited by dionvdberg
Posted
59 minutes ago, dionvdberg said:

Is this a good option, and then where do I start with the correct settings because of the float bug?

I assume that the 24 V Pylontechs are OK. Owners may care to comment.

If your inverter (hopefully it's a lesser-known genuine Axpert rather than an actual clone) has timed absorb or equalisation settings, use those.

If not, I'd set the float and absorb/bulk settings the same (Pylontech used to recommend that, perhaps they still do), but I'd use about 27.5 V for both (Pylontech may recommend something like 28.4 V for both, but that's far too high, especially with an Axpert, doubly so if it really is a clone).

Another possibility is an external MPPT, and just leave the inverter's PV input unconnected. For these, hopefully there is no premature float issue, so you could use say 27.6 V absorb/bulk and 26.9 V float. Those are close to the values I use myself (divided by 2 because I run 48 V).

Posted (edited)

Thank you, should probably have gone 48v from the start but will be expensive now.. :(

 

How would you recommend I configure the panels?

Edited by dionvdberg
Posted
On 2022/04/30 at 4:10 AM, dionvdberg said:

It has the battery equalization settings, what voltage, and time would you recommend? 

Make the "equalisation" voltage the same as the bulk/absorb voltage that you want. Time 90-120 min, use trial and error. You want to see the battery charge current to typically reduce to about one sixth of the maximum charge current setting by the end of the equalisation time. This will depend on loads, weather, etc, so it's a difficult compromise.

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