You are certainly trying to save money, but you can conserve more over time if you substitute them. You can anticipate that your bills will go down since the new models don't consume lots of energy.
Essentially, you will not be using much of the energy originating from electricity businesses so there is a likelihood that your monthly expenses will probably be reduced by more than half. You can expect that it will probably be worth your money even if the preliminary investment is high.
You can think about these renewable power sources as an alternate to reduce your monthly electricity bills. You can try utilizing them the entire night and collect energy during daytime.
It is best to consider renewable energy options along with your current energy supply. Fundamentally, you can't rely entirely on renewable power options at this time to offer the energy requirements of your household.