Decisions, decisions

We are getting to the end of the work and now I have some last minute decisions, mainly electrical.

• Should I get a solar system to trickle charge the main system?
• Should I fit an inverter just to run the fridge and charge phones and a laptop? Worth it? If so, pure or modified sine wave?
• Should I fit extra batteries if I'm using an inverter? What size inverter?
• Should I fit a calorifier tank even if we're not ready to have the hot water system installed? How big?

For a variety of reasons, I'm seriously considering dumping the BMC 1.5 as well.