It depends on how many accumulators (measured in storage units) are recommended for 22M sat. In Europe (and I think elsewhere too) the price of accumulators is about $1000 / kW (this includes installation and commissioning). As for solar panels...don't believe that it's not worth installing more...solar panels FIRST and foremost don't need heat, but light. The only decisive factor is the inverter (central unit of the solar system). This is usually overloaded by about 30-40%, but it is not recommended to overload it more than 25%. (for example, if you have a 10 kW inverter, you can add a maximum of 12.5 kW of solar panels). If you want more than that, you need a larger inverter.