I want to set up a simple solar circuit to power a 12V, 70W micro diaphragm pump. This solar system will not have a battery. My intent is for the pump to energize when there is adequate voltage from a single 100W solar panel and de-energize when the voltage drops. My concern is that excessively high or low voltages will harm the pump. So, I am wondering if my concern is valid and if so, how to protect the pump? Would a charge controller serve the purpose of voltage regulation or is there a better way of going about it?