I installed 4 12 volt 100 amp lithium batteries replacing 6 6 volt AGM batteries.  The performance is spectacular, ran the Xantrax SW 3000 for about 17 hours overnight and the voltage was still at 12.9-13.0 volts.  With the AGMs it would have dropped to 12.3 volts with the same load, refrigerator and all the electronics that I have.   I have not charged the new batteries yet because I have not reset the charger settings, the charge is what they had from the factory.  The new batteries are much l