Researching upgrading the batteries, I come to the following conclusions.
The Xantrex XM Pro 1800 and the
Trombetta 684-1251-012 12V Power Seal DC Contactor are weak links in the whole system.
Also, when you have more than 2 house batteries, you need to implement BUS BARS so that your house batteries will discharge / charge equally across all of the batteries. This is true for all types, Flooded, AGM, lithium, etc. Otherwise, the batteries will probably be yet another weak link.
I think at this time I will go from 6-volt flooded to 6-volt AGM batteries rather than Lithium. There is just too many issues to try to use Lithium. With Lithium you will have to add a DC-DC charger off of your alternator. No choice.
So, I'll upgrade to:
Xantrex 817-2000 Freedom X Inverter, 2000 Watts, 120VAC Output, 12VDC Input ( A lot more protections for power, heat issues, etc )
Amazon.com
Xantrex Freedom X & XC Remote Panel w/Bluetooth & 25' Network Cable.
Amazon.com
WFCO Arterra WF-9855-AD-CB Converter/Charger Deckmount 55Amp DC Output (15Amp AC Power Cord), Gray. ( This one supports Lithium )
Amazon.com
Trombetta 114-1211-020 12 Volt Bear DC Contactor. ( Lower resistance, less heat, more robust )
Amazon.com
Also, I ordered some Lithum batteries off of Amazon, but I found there was no support per se, other than responding to warranty email, and the company website was invalid. These are not good signs, so I decided to return the batteries and cut my losses. It cost me $ 197.00 to return the 4 12-volt Group 24 Lithium batteries. Amazon, did not give me the option of dropping them off at the local UPS store, another red flag. Probably want get a refund. Lesson learned.
6-volt batteries is probably the best foot print still. Just get AGM instead, but add bus bars, shunt, bluetooth monitor and some sort of BMS solution , maybe include on/off switch to allow the use of a NOGO Genius 10 battery maintainer.
