LFGSS Camper Van owners?

Does anyone have a decent amount of experience about alternator+solar panel based power systems?

If so, what's the go-to, cheap and cheerful whilst also being robust system?

Previously I've put together a solar charging system with Victron stuff, which was straightforward but far from cheap.

Engine under consideration has a 40amp alternator, requires a battery to start it but it's a twin cylinder, 500cc unit so I doubt it's going to take a huge amount of oomph to spin it. Diesel however, so a mental compression ratio if like me you are only really familiar with petrol.

What needs power:

• Bilge pump/s
  
• Navigation lights
  
• Depth sounder
  
• Panel to display output of depth sounder
  
• VHF radio
  
• LED lighting
  
• An inverter that could charge power tool battery chargers (the inverter to be turned off when not in use
  
• I'd imagine two batteries in this scenario? One to spin the engine over and one to power the ancillaries.
  
  

Yes it's a bit of an odd camper, but the principals are very similar I think!