Solar to electric conversion will be more expensive (short and long term) than buying electricity. The only time it makes sense is if running the utilities is a big fee. Having designed several off-grid systems from $20 K to $300K, there are some pretty cool pieces of equipment out there for solid waste heating that are more economical, especially if you have a supply of wood.

Hydronic panels with a drain down feature, directly preheating the water, is a good option that should save you some $.