I will deal with the size issue.
Many posts the person says "I have a 12 volt battery".. great. I'm looking at a 12 volt battery as I type. I can hold it in one hand comfortably 7 Amp hours capacity.
I once borrowed a battery from a battery company for a weekend This sucker was a good 4 feet long. 3 or more high and a foot thick. they loaded it on my rented trailer with a fork lift. another of the same powered the fork lift.. About a thousand amp hours.
See what "I have a 12 volt battery" is not enough information.. both are 12 volt batteries
Tw2 GC-2 batteries roughly equal one 4D. that's 220 Amp hours at 112 volt
YOur Group 24 was likely about 70-75
It is the number of WATT-HOURS (Amps times volts times hours) that determines the volume (And weight) of the battery... For most 12 volt lead acid batteries. from Flooded wet to AGM. the size and weight needed to hit 200 Amp HOurs capacity are nearly identical.
Now the WFCO converter
Nothing wrong with it till it fails. then get a Progressive Dynamics upgrade.
