RBrian

Jacques Ester
Thanks for the info 👍
9% left at #12 @ 47V sounds about right then 😎

Hi RBrain.
My settings as follows.
The lowste I have seen on Solar Assistant was 46.5V under a +-2Kw load and according to the battery it had 9% State of charge left.

Hi, I have eventually taken the plunge and gone for some solar stuff 🤓 
Eventually the system is to power a mission-critical load, an FM Broadcast Transmitter 16.5 hours a day.

I did search for what I am looking for but did not find any satisfactory answers.
I am looking to get the most out of the battery(s).
I have...
12 x JA Solar 460W panels.
1 x Master Power Omega X-Rack 5kW 48V MPPT Inverter - Zero transfer time.
(As far as I can see it's the same as Voltronic Axpert King 5K Rack)
1 x Pylontech 48V 3.5 kWh US3000C.

At the moment I have the system on a bench test in the workshop.
With just 4 panels connected and a 1000W resistive load available.

Pylontech Specs say...
Nominal Capacity (Wh) = 3552 = 100!%
Usable Capacity (Wh) = 3374 = 95%

Omega X-Rack Specs say...
Battery Mode Peak Efficiency = 90%
Therefore 90% of 3374 (Pylontech Usable Capacity) = 3036Wh

*NOTE* Setting #12 = Battery voltage point back to utility.
On test from fully charged I have tried...
#12 @ 48V it did 2.35hrs -or- 2:21 = 2350Wh
#12 @ 47V it did 3.12hrs -or- 3:07 = 3120Wh

As you can see 2350 is well under 3036 and 3120 is a little bit over 3036.
Question > Will I be OK at #12 @ 47V ?

BTW: Note the little kick starter on top of the inverter 😎