As been told, the photovoltaic solar panels can absorb free air source, more energy saving and cost saving in the future. However, it also bring large initial investment.   Lately we OSB heat pump factory are in develop on new concept for DC inverter swimming pool heat pump connect with Photovoltaic solar panel directly, without the high cost Grid connected inverter system. Through add a module in our heat pump.Which can help you save much more cost on the complete system.   Now it would be match in our DC inverter swimming pool heat pump. Find more features as below: * Combined with photovoltaic panels, more than 80% energy saving. * Adopt advanced inverter technology, water temp difference less than 1°C. * Constant water heating & cooling function. Maximum hot water temp up to 40°C. * Smart WIFI app remote control available. Phone/computers control anytime.   * Auto defrosting function available. * Kinds of protection, such like high/low pressure protection. Insufficient water flow protection. * Applicable to pool, jacuzzi spa or fish cultivation. * Galvanized steel shell/ plastic cabinet/stainless steel shell optional. OEM/ODM service welcome. * Green gas R32/R410a/R407c optional.