Common types include PWM (Pulse Width Modulation) and MPPT (Maximum Power Point Tracking) controllers.

Yes, all our products undergo strict quality control and certification testing, including CE, FCC and other international standard certifications to ensure the safety and reliability of our products.

Of course you can. We offer returns and exchanges within 30 days (except for some items, such as customized products), please contact us as soon as possible after you receive the item and explain the reason, and we will handle the return and exchange procedure for you.

Yes, our products comply with the relevant standards and regulatory requirements of the U.S. market, to ensure the legality and safety of sales in the U.S. market.

Our products are widely used in home, business, industry, agriculture and other fields, including home backup power, solar power systems, RV travel, outdoor camping, marine, etc., in the top three sales rankings on Amazon, get the consumer has been well received, to understand the evaluation of the product you

Yes, most of the products come with detailed user manuals or operation guides to help you quickly understand the usage, precautions and maintenance knowledge of the products. If necessary, you can also download the electronic version on our website.

Of course, we will keep you informed of new product information and discount offers via email, social media and website announcements. Please make sure you are subscribed to our email notifications and follow our social media accounts.

You can get coupons by following our social media accounts, participating in online activities or inviting friends. We will release coupon campaigns from time to time, so stay tuned.

On the checkout page, find the coupon input box and enter the coupon code you have obtained, the system will automatically calculate the discount amount and display it in the order total. Please note that each coupon may have different conditions of use and expiration dates, so please read the instructions carefully.

Coupon expiration dates vary from event to event, so please read the expiration date instructions on the coupon carefully before using it. Expired coupons will not be available for use, so please be sure to use them within the expiration date.

Reasons why a coupon cannot be used may include: the coupon has expired, the conditions for use have not been met (e.g. full use), the coupon code has been used or the product does not support the use of the coupon.

Some coupons can be stacked with other promotions, but some coupons may not be stackable. Please read the coupon's instructions and promotion rules carefully before use to determine if they can be stacked.

If we find that the price of an item drops within 14 days of placing an order, you can contact our customer service to request a price difference reimbursement. However, please note that some special products (e.g. customized products, limited time discounted products, etc.) may not be able to enjoy the price difference compensation service. Please contact our customer service for details.

Our prices are adjusted according to market supply and demand, cost changes and other factors. We will try our best to keep our prices stable and reasonable, but we cannot ensure that they will remain the same forever. If there is any price adjustment, we will update the relevant information on our website and notify users in a timely manner.