Have been doing a return on investment for solar investment and this is my finding. 1.A solar water heater will return your initial investment within 3 years ,and save your money for next 15-20 years. 2. A solar system ,maybe ya supplement your grid and kuensure you have power all the time ,will also return your money within 4-5 years. With your small saving ,,you can supplement with a reasonable funding ,and it's worth it . In long run ,,just like the way mtu husave for retirement ,I think kuinvest in solar is a good plan,,and will save your power bills money in the long term aspect