[bikestuff]

I dry camp exclusively.  That said if I let my batteries deplete down to 20-30% I can end up with 3-4 hours of charge time on the generator.  At some point I may add solar, but one of my favorite spots is super shady so that would not help. I think my current setup allows for roughly 100 amps/hr of charging.

600 AH of lithium
Magnum Inverter

If the question is can you charge the batteries faster?….I think the answer is no.  Sorry.  

Your charger (I believe) has a charge capacity of 125 Amps DC.  Since you have 600 Amp hours worth of batteries, it will take 600/125 = 4.8 hours to charge fully depleted batteries.

If you could trickle some charge into the batteries using solar that will help…but like you said…only if you have sun.

Another approach would be to add additional batteries.

Finally, it would also pay benefits to understand what is using your battery capacity.   The HH water pump is a huge draw.  So would any heaters.   I am not sure what the AH water heater draws when you are diesel, but it is definitely something.

If there is a better way of thinking about this…(especially for those that have lithium setups)…please chime in.