Welcome to the forum. And thanks for providing details of your setup first thing; it really helps.
Those are possibly a tiny bit high for the longest life. Weber and I also use 16S LFP, and we use 55.2 V and 53.8 V. But first you need to sort out your charging woes.I have set them up with 56V as Bulk and 54.2V as float.
Every PIP/Axpert comes with both charge bugs from the factory, no extra chargeBased on reading this forum the inverter has the float bug.
I have no experience with this, since I use patched firmware. No patched firmware is available for your model, unfortunately. What I've been suggesting (and have had no feedback about) is to use the timed absorb feature (setting 32, "Bulk charging time"). That swaps one bug (premature float) for another (time under the cloud is counted the same as time in the sun), but it seems to me (without actually trying it) to be the "least worst" of the two bugs. The idea is to put setting 32 to something like 90 minutes (adjust with experience), so that even though the inverter will decide to praogress from bulk to absorb stages too early, it will be forced to stay in the absorb stage (aiming for the higher battery voltage, setting 26) for at least 90 minutes every day. Due to the factory firmware bug, it could be 90 minutes of shade/cloud/rain/snow, but at least it will be aiming for the higher voltage for longer.1. for the batteries i am using what is the optimum bulk and float and any other settings i should set considering the fact that it has the float bug.
I used to use those values myself. Recently, I've switched to 50V and 52V (you might want 50V and 53V to keep your battery SOC higher from grid power). But since you want to be as cautious as possible with your battery, 51 and 53 V is good.Also would like advice on back to grid (my settings is 51V) and back to discharge voltage (my settings 53V).
The intention of the equalisation settings is to periodically overcharge a flooded lead acid battery, so it keeps the cells equalised, and you just top up a bit more water as a result of the over-charge. You don't want to ever do this to a lithium battery of any chemistry. However, you have control over the equalise voltage, so you might be able to use it to your advantage.2. Can someone explain battery equalization settings, if it can be set for this inverter model and whats the recommended setting for my battery.
I suggest this: set the equalisation voltage (setting 34) to the same as your bulk/absorb voltage (setting 26). Set the equalisation interval (setting 37) as long as possible, probably 90 days. Make the equalisation time (setting 35) fairly long, say 3 hours (180 minutes). This means that every 90 days your battery will stay in the bulk or bulk/absorb stages (aiming for the higher battery voltage) for the 90 minutes of timed absorb, plus the 180 minutes for an "equalise" charge (which will just be more bulk/absorb charging). That should not take too much life from the battery, and might even be good to get a really good charge now and then. But now, if you are faced with a long period of cloud / rain etc, you can use setting 39 (Equalisation activated immediately) to extend the charge time for the battery with minimal effort. Monitoring software such as WatchPower should make it just a few clicks of the mouse. If the next day is still cloudy or rainy, use setting 39 again. If not, just do nothing; setting 39 is a "once off" thing. If you have a Raspberry Pi or other embedded computer monitoring the inverter, perhaps you could add a button that sends the appropriate command when you press it (command PBEQA1, I believe). Or you could get really creative and have a light sensor and clever software that somehow does this automatically.