Hi Guys,

Excellent site, lots of info.

Can anyone help me with the correct battery / charging settings for my Axpert 5KVA Inverter.

I have

4x 300W Panels
4x Royal 1111K Batteries

I rewired most of my house that only the required appliances / lights are on the inverter system.  Max the load will run to 900W, but on ave we run at around 500W on the inverter.

I would think that the battery bank should always be either full or 90% + so that if the power fails during the night we could still have enough power on the batteries to carry us for a while.  At the same time I would like the Solar panels to add some value to my utility bill.  Can anyone recommend values for the following settings?

Charge Source Priority: Utility
Output Source Priory: Utility
AC Input Range: Appliance
Battery Type: AGM
Output Mode: Single
Output Freq: 50
Back to Grid Voltage: 46
Max Charge Current: 10
Max AC Charging Current: 10
Back to Discharge Voltage: FULL

Bulk Charging Voltage: 56.4
Float Charging Voltage: 54
Battery out-off Voltage: 42

 

Thanks,
A newbie solar / inverter user

19 hours ago, CyberSaint said:

4x 300W Panels

That's light for panel power.

19 hours ago, CyberSaint said:

4x Royal 1111K Batteries

Those are not ideal solar batteries. "Consistent starting performance" per this "datasheet". Don't expect a long life from them.

19 hours ago, CyberSaint said:

I rewired most of my house that only the required appliances / lights are on the inverter system.  Max the load will run to 900W, but on ave we run at around 500W on the inverter.

500 W is a bit high for an average, especially with only 1200 W of panels. So I suggest not running on battery at night, so SOL Output Source Priority.

19 hours ago, CyberSaint said:

Charge Source Priority: Utility

No, this will cause the utility to charge the battery, solar only in a day-time blackout. Use SNU (Solar and Utility, in that order).

19 hours ago, CyberSaint said:

Output Source Priory: Utility

No, that will cause loads to run from utility all the time, even when there is solar power available. Use SOL (Solar first). This will cause the inverter to switch to utility at sundown, so you will be ready for blackouts. If you want to run your night time loads a little, use SbU and set the back to grid setting (setting 12) quite high, like 51 or 50 V.

19 hours ago, CyberSaint said:

Back to Grid Voltage: 46

I would make this (setting 12) much higher, around 49 or 50 V, unless running loads at night, then 51 or 50 V. You might as well set the back to battery voltage (setting 13) at FUL, or perhaps 55 or 56 V. That's so that you have a high charge in preparation for blackouts.

19 hours ago, CyberSaint said:

Max Charge Current: 10

You have a starter battery, so I'd guess that 20 A or more would be OK. You don't have more panel power than 20 A (battery side) anyway.

19 hours ago, CyberSaint said:

Max AC Charging Current: 10

Again, may as well make it 20 A.

19 hours ago, CyberSaint said:

Back to Discharge Voltage: FULL

See above,

19 hours ago, CyberSaint said:

Bulk Charging Voltage: 56.4
Float Charging Voltage: 54

These are fixed, unless you change the battery type (setting 05) to USE. 

19 hours ago, CyberSaint said:

Battery out-off Voltage: 42

I would set this a bit higher, say 46-48 V, to protect your battery from excessive discharge. 

See also https://powerforum.co.za/files/file/4-axpert-settings/ .

 

Thanks for the feedback, will def make some changes.  I will add Panels and batteries as I get some funds in, but this is what I had to start with.

Really appreciate all the advice.