Deonbayly

Hi. I am 100% off grid on a farm with many fridges and freezers, cold room, chicken lamps etc, so its needed! I have 20 545 panels to add. Its looking like getting a second 11kw invertyer may be the best option....

Have a look at setting 11(it may be under a other number on your inverter) "Maximum utility charging current" You may need to adjust it.

You've just solved a problem I didn't realize I had!
My charging rate seems to be governed in some way and now i know why!!

Your grid charge rate is set low.

@Richard Mackay - Most Gensets only have a 12VDC output, so not going to help on a 24VDC or 48VDC that Axpert uses.
@Sandro - Gensets are all different, so difficult to say if the output will be accepted by the Axpert. You can most often safely try putting the output of the Genset to the Input of the Axpert, if the Axpert doesn't like the supply then it will stay "offline". Be aware of something I like to call "hunting" - This is when the Axpert will switch from one mode to another on/off - This could damage the Axpert if done over long periods and will NOT actually charge the batteries. So , the simple answer is to try. Unless your genset is majorly faulty, you can't damage the Axperts inputs while testing for short periods (10 min, unless "hunting"). Think of an Axpert like a large PC UPS, it might or might not like the stepped 220VAC that the genset provides. I have 3 UPS's that are happy with my genset stepped output and 1 that doesn't - As they say: "Milage may vary".😄
Addendum - If the Axpert "hunts" you wont have damaged it if it is for a short period (like 10 min) and then you just disconnect and know it wont work

It's a common problem. You can try setting 03 = APL, though that's the default. Otherwise, you can try putting a moderate load (~200 W or more, preferably a resistive load like a sandwich maker) on the generator before connecting the AC-in to the generator. Petrol generators without inbuilt inverters don't run all that well on zero load, and the Axpert will be checking the generator output quality at zero load, and rejecting it if the voltage, frequency or other characteristics aren't good enough. Adding the moderate load settles the generator somewhat, and it may be enough to pass the Axpert's test. Once the Axpert starts using generator power, that will settle it down as well, and you can switch off that moderate load.
It won't work with every generator, but I've seen it work with a couple, so it's worth a try. Otherwise, you'll need a generator with an inverter built-in. Voltronic Power recommends a generator with a rating of at least 150% of the expected load; some generators don't work all that well at very high loads, either.

Just to inform the non-technical guys as to what the actual problem is.
 
The AVR (Automatic Voltage Regulator) in a generator is a reactive thing. In other words, as the load on the generator changes the AVR adjusts things to try and keep the specified output (50Hz, 230V or so). You may hear the generator changing RPM's as you switch different loads on and off. When you have no load on the generator it becomes more difficult for the AVR to keep things steady. This is almost like a car engine running without a flywheel... it will work, but is much more erratic. So the load on the generator actually helps to stabilise it.
 
So, when you connect the generator as input to the Axpert, there is no real load on the generator (as the axpert has not switched the generator power to the output yet). So the voltage and frequency is a bit instable, and this is what the axpert complains about. Your grid power is very stable, on the other hand, and the axpert is made to work with a stable incoming grid supply.
 
The newest version of the axpert firmware basically just allows the incoming voltage to be a bit more unstable, so to speak, before it starts complaining about it. It allows for a greater variance of voltage and frequency.
 
One possible way of solving this, if you have no means of upgrading your axpert, is by connecting a load onto the generator, in addition to connecting it to your axpert input. This will help stabilise the generator output, and consequently the axpert sees a more stable input. As to what the load should be will really depend on the generator, but I'm guessing a load of about 100W should be enough (but don't quote me on this... never tried it!).
 
Hope this helps.

@Deonbayly
Your setting is too low for lithiums. The logic of the Axpert was written for lead acid use. You need to try and adjust settings 12  13   29.
Provide your settings. The 04 error will flash up to the point of discharging to setting 29 shut down.