Solar and Battery Bank for medical back up

Here is my best guess on how my solar currently recharges our medical reserve batteries.  We can run my CPAP and never have down time, but add in my O2 concentrator we can only count on the battery bank every 3 to 4 days.  Please note I could run my generator and run my recharger to recharge the Batteries and of course we can and usually plug in.  If I add one more battery I could get an extra day or two.  But to be honest I was only looking for one day emergency power to start with.

I am no expert here so I sort of reversed engineered the data below.  Also I could shorten up my wires by 10 to 12 feet which may add quite a few amps.  Some day I may.

3 Batts 305 amps

Cable/inverter amp drop 30%	-90
	215
50% Battery AMP Reserve	108
CPAP 3 amps x 8 hr	-24
Concentrater 7 amps x 8 hr	-56
	-80
Leaves usable amps	42
	Plus
Solar 200 watt recharge 5amp x 7hr	35
Day 1 recharge is short	3amps
Can not use solar batteries for day 2
Solar 200 watt recharge 5x7	35
Day 2 recharge	110
Night three should work OK
Clouds or overcast could delay a day or two. Updated 4/10/2016
Solar recharges every 3-4 days should be planned.