120vac to 24vdc charger recommendation when generator is charging batteries

I have a 24v 3000w multiplus2 with 2 150a lithium SOK batteries that need charging from my Propane 6500w Genmax 2 wire auto inverter charger in those winter months when solar is not quite enough. Will a 30a dc charger be satisfactory? Any recommendations for a charger?

Do you not want to use the charger built in to your MultiPlus-II? It has a 70A charger built in.

Yes, I forgot about that charger already being there.