Judging whether a solar charge controller is good or not can be determined by the following four aspects，factory expertise, price, materials and after-sales service.

       1、Factory strength

Engaged in the industry time, professional for many years to do solar controller manufacturers have more experience and R & D ability. OLYS company  is engaged in solar controller for 15 years, with mature product technology and production capacity.

       2、Price

As the saying goes: "A penny, a penny of goods" is too cheap the controller must be tricky. The controller is a long-time  working product, which requires round-the-clock work and harsh working environment. There are high requirements for the design, process and materials of the controller. Too low a cost is impossible.

       3、Material The quality of the material directly determines the life of the product. The same solar charge controller using domestic components and using foreign components may be several times the price difference, some manufacturers even in order to reduce the cost, using disassembled components for production. All OLYS company solar charge controllers use industrial grade imported chips and MOS tubes to ensure the reliability of the products.

       4、After-sales service

Professional after-sales service can help you correctly select the various component parameters of the power generation system, including solar panel size, power, battery type, voltage, capacity, load type and mode of operation. These must be guided by professional personnel.