Reduced solar charge.

360 amphr 12 volt lithium batteries -had 1100 watts of solar panels divided over three solar controllers-have just changed to one 30 amp controller with 300 watt panel and four 200 watt panels with one 60amp Renogy solar controller. The problem is the batteries stop charging at only 13.5 volts which is too low for my needs. What is the problem ?
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Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
Many 300 W PVs have 60-cells, and many 200 watt PVs have 36 cells. If this is the case with your PVs, the single Charge Controller may not be able to make good use of all of the available PV power.
What are the specs of each set of PVs on your system?
Vic