Off-grid solar system design

I saw many off-grid solar system designs are like this:

[PV modules] =(DC)= [charge controller] =(DC)= [batteries]
|(DC)|                     |(DC)|
[DC outlets]               [inverter]
|(AC)|
[AC outlets]


The inverter use DC from the batteries. Will this cause the batteries charging and discharging at the same time, and shortening the batteries life?

Can the inverter connect to charge controller, and use DC from the PV modules without consuming batteries if PV modules provide enough power? The idea is just like this:

[PV modules] =(DC)= [charge controller] =(DC)= [batteries]
/(DC)/     \(DC)\
[DC outlets]  [inverter]
|(AC)|
[AC outlets]


How do I integrate other power sources like the electrical grid (plugs), an electric generator, or a car engine into this design? Just connect them to the charge controller?

              [electrical grid]
|(AC)|
[inverter]  [car engine]
\(DC)\     /(DC)/
[PV modules] =(DC)= [charge controller] =(DC)= [batteries]
/(DC)/     \(DC)\
[DC outlets]  [inverter]
|(AC)|
[AC outlets]

• It might surprise you to learn that there is a schematic editor built in to this site. It's not perfect, but it generally produces results more readable than ASCII-Art. – brhans May 27 '19 at 22:46
• @brhans, thanks for your information. I'll try to learn that. – 李岡諭 May 27 '19 at 23:50