OK - I have come to realise that I have been fooling myself about my preferred Solar Charge Controller.
I have eluded to the problem in threads and having written to the manufacturers and got no response, I thought that I should be honest and "Come Out"..

Don't get me wrong - the device is simply great with it's value-for-money features, but if it does not do the most basic function "Correctly" , then you need to make a value judgement on it's worth.
Like most Solar (MPPT) Charge Controllers, the PCM5048 does not really like Sealed Batteries. AGM, Gell, VRLA etc. etc.
I can understand WHY, because there are so many technology differences with AGM, Gell, VRLA etc., and to have a One-For-All Algorithm, is just not practical..
We "Understand" that the BIG issue with sealed batteries, is that if it GASSES, then you are seriously damaging the technology..
You don't have to be Einstein to believe that IF you set a MAXimum Float voltage and no Absorb, then, the MAXimum voltage that you would EVER see, is that FLOAT voltage.

At lease that is how it works with other CC's that I have seen... Like the FM60..
Now if you encounter this display, showing that you are now 1V over the Float Limit, and the current is still flowing, you can understand how concerned one would become..
I noticed this issue early in my relationship with the MPPSolar PCM5048, but accommodated the problem, by incrementally decreasing the FLOAT voltage, until the FINAL voltage was where I wanted it to be ie.. 54.6V
For a long time, I lived with thinking all was fine, but that stopped, when I noticed the voltage at 54.2V and charge current at something like 2A.. at.. Midday - Full Sun - Expecting 20A (plus) and only getting 2A.
Clearly, the CC was responding to the float voltage ( Set at 53.3 --- ie. 1.3V lower than the needed float ) and reducing the current according to some kind of algorithm..

This means that I had been wasting many kWH of power, that I could have been put to practical use..
So - my question is -
"Does anyone else own a PCM5048 and can you confirm that YOUR device stops charging at FLOAT, or does it also keep charging to an uncertain and injurious voltage for sealed batteries..

( I repeat- NO Absorb, NO Equalise - Just set Maximum Voltage )
I have cheated and have solved the problem for my application..

I am using the HOUSE, as a "Dump-Load".
When Vfloat is set to the correct 54.6V and when Vbat reaches 54.8V, I use one of the two inbuilt Voltage Relays, to connect the Inverter to the house circuit.. Thus using any Solar-Power available in the home.
When the Vbat drops to 53V, the inverter drops out again..
All VERY practical..

BUT - I would love to be able to honestly recommend the device, and know that others are not looking for methods of overcoming it's shortcomings..

Do you own another model.. Like the PCM8048 (80A version) ... OR the High Voltage version (CX)..
Do you see the same problem with them..?
Our PCM series MPPT controllers come with large LCD display .....Parallel connections are also possible on our large size MPPT controllers (PCM-5048, PCM-8048) to handle very large array. Intelligent and highly efficient, these controllers are the best choice in any off-grid application.
Note: 240VDC high input voltage MPPT models are also available on PCM-CX series in 40A (PCM-40CX) and 80A ratings (PCM-80CX),
..
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