Renogy 60amp controller low charging voltage

For a 12.8v Lifepo4 battery what is the voltage required from the controller (above the battery voltage) to actually charge the thing. I am under the impression it would need to be higher than the battery voltage to actually move anything around.

I currently have a Renogy controller that doesn’t seem to differentiate from the charging voltage (in the day when the panels are producing) and the battery voltage once the panels aren’t producing. What I mean is the controller only has one display for both. So in the day its showing you the output from the controller. At night its just displaying current battery voltage.

My question really is the controller working properly. I don’t understand why the controller isn’t outputting 14.6v in mppt (where it seems to be making the decisions about what to do with available power) it seems to be charging at a very similar voltage to that of the batteries and therefore at higher amps.

I have the settings in line with that of battery recommended specs.

It is also possible I suppose that currently I don’t have enough power to charge this 200ah 48v bank. But regardless of that shouldn’t the controller convert the power available to a voltage sufficient to charge the batteries, irrespective of the amps?
All charging setting are as battery manufacturer specs stipulate.

Do you have a BMS on your batteries? My Renogy LiFePO4's have built in BMS with Bluetooth as well as my Renogy charge controller. With the Renogy phone App I can read the batteries and the controller rates, I never depend on the read out on the controller for any details. I did not think the Renogy did 48 volts but I do not know. I checked the spec's just now and it does, auto detect and you did connect the batteries first?

The batteries all have their own 100a bms, they were balanced and charged independently and in parallel prior. (The photo of the controller showing 13.5v was from when they were being charged in parallel. I agree with what your saying about the inaccuracy of the controller read out.

I also seem to remember reading somewhere that lifePO4s don’t need an equalisation charge or a float but the battery settings say it does.

I just can’t see how you can charge a battery to 13.5v when the controller is only converting to 13.5v. Not to mention the fact the required charging range is 14.2-14.6v.

After reading a few other threads about optimal charging voltage per cell. I’m still curious as to why I seem to have a low charging voltage from the renogy charge controller.

48v battery bank with 4x 200ah 12.8v Lifepo4.
Currently 3 x 325w mono panels wired in series generating upto 950w. This moment 680w, 76vdc, 9amps approx.

Charging voltage displayed on the renogy, currently around 54.3vdc. 12amps into batteries.
Which should be 3.39vdc per cell.

Meter reads about half a volt below this across the batteries. (Quite old and hasn’t been calibrated for a while but a fieldpiece so possibly more reliable). Although inverter voltage input displayed similar to that of the renogy.

Battery setting user, (multiplied by 4 that’s how renogy roll)
Equalisation voltage - 14.0
Boost - 13.8
Float 13.8
Float return - 13.2

Rarely see any charge method other than ‘mppt’.

I don’t know if this a problem or normal or just how renogy work? Or something I have wrong in the setting. But have read that a cell should be charged at around 3.4-3.65v depending on application.

Thanks