Well it appears the Achilles Heel of Lead Crystal Batteries is obvious.
According to this Tech Bulletin 2018/001, In Bulk phase proper current and charge algorithm must be used.
example: battery bank consisting of 2- 6 volt batteries @ 260 AH would require
a 0.2C @C10 (or 20% or the C10 rate)
C10 = 240 AH x .2 = 48 AMPS ! under optimal tilted conditions a 100 watt solar panel puts out about 6 amps. 48 / 6 = 8 -100 watt panels.
If your panels are flat you could see something like 4 amp out of 100 watt panels. 48 / 4 = 12- 100 watt panels.
In order to charge LC batteries per the manufacturers requirement, you need a
60 amp battery charger /solar controller / DC-DC charger that you can manually set specifically to its charging algorithm. $$$
Bottom line these batteries should never have been marketed for trailers or under hood RV IMO.
Tech Bulletin 2018/001 click link below
https://4127787.app.netsuite.com/cor...%20for%20solar.