Hi everybody
I'm living in Turkey and intend to move to the country.
My house is still a construction site but I hope to be able to move in there in a few months.
Because there is no electricity, I'm forced to get it from solar energy.
Initially I was aiming for Victron. But for more a year now we've had such inflation and currency devaluation that I can't even dream of it.
So I decided on Axpert 7.2kW and came across this forum while researching.

I have read almost all the posts about this device and always had to think longingly of Victron.
But it's okay: you get what you pay for.

Axpert seems to have sometimes trouble charging the batteries when the sky is cloudy. This is a no-go for me because batteries that are always charged are essential for my survival.
Of course I have a generator; but this should only be used in emergencies.
So my first question is:
Is it possible to attach an external cheap PWM-Charger without switching the cables? Maybe only by changing some values in the setup?

Second question is:
Do I have the option to sniff around in the menu without connecting the panels and the batteries?
My intention is to get to know the device a bit before moving to my new location.

Third question is:
Can you rely on the voltage-, charge- and decharge-values of this inverter? Or would it be more reliable to obtain this data from an external device?

Thanks in advance for the answers and also a big thank-you to the operator of this forum: the knowledge I have acquired here has helped me a lot.
 

3 hours ago, MehmetK said:

Axpert seems to have sometimes trouble charging the batteries when the sky is cloudy.

Hi Mehmetk.

First, "charging the batteries when the sky is cloudy" is not an inverter's problem. It's the PV panels characteristics. The PV panels can only output in relation with the sun shining on them, the power that comes from the sun. In my experience the Axpert/Synerji MPPT does an excellent job. You cannot improve by adding another charger. The only way would be by adding more PV panels. But you must also respect the max limit of the MPPT at max PV power output.
I would suggest rather than buying the (exotic) 7.5kW unit, buy two 5kW MKS 5K (or 4kW MKS 4K) and operate them in parallel. They are very popular and widely used. You would rarely have to worry about overload. But the most interesting aspect is operating reliability. If one of them fails, you can still operate with the remaining unit until the faulty is repaired. They have a 4kW MPPT, so you could install up to 8kW of PV panels.
And remember, the key element to any PV installation are the batteries. Yes, I know, they are costly. In my installation they represent 2/3 of the investment. But they are the ones that overcome the cloudy days.

Edited January 15, 20223 yr by Beat

Hi Beat

Thank you for the feedback and your suggestion with the 5K-Inverters. I will look if there are available here in Turkey.
But concerning the cloudy sky problem, I will point you to the message of Nullmoden a few hours ago. Its only one example of many others I found on the web. No one is saying, that the Axpert has always a problem with that situation. But this problem seems to be happen from time to time.

He also claims, that a simple PWM charger was able to do the job.

 

49 minutes ago, MehmetK said:

But concerning the cloudy sky problem,

I have a Kodak OG-7.2. I have never had a problem charging batteries on cloudy days. As the sun rises and the PV activates, my batteries start charging. 

6 hours ago, MehmetK said:

I will look if there are available here in Turkey.

Voltronic may sell them in Turkey with another brand name as they do in Europe. But I don't know them. You would have to google.