EPEVER 20A MPPT Solar Charge Controller 12V/24V Auto Working Max PV 100V Modular Design Solar Panels MPPT Regulator with LED LCD Display Double USB Port for Solar Home System EPEVER TRIRON series adopts original module design, with Power Module as the main unit, equipped with different display modules and interface modules for varied combination to meet different requirements. Advanced MPPT control algorithm to minimize the MPPT loss rate and loss time, tracking efficiency above 99.5%, maximum charge conversion efficiency as high as 98%. LCD and indicators to display operating data and status of the system, master and slave RS485 communication modules design, reading the load or inverter operating data. USB output interface provides DC power for electronic device charging. User-friendly buttons for comfortable and convenient operation. Perfect electronic protection function, effectively prolong your battery life and improve the system performance,safety, stability and long-term operation ----- Protection inculde Lithium battery low temperature protection/Controller overheating protection/Battery over discharge protection/PV reverse polarity protection, etc.. Multi-functional: with compact design and load switches, it's ideal for small solar system especially home system, and suitable for primary solar enthusiasts. Convenient for outdoor operations, you can charge your mobile phone in time. Shipping We offer FREE shipping on all orders in US We ship within One-Three business days of payment, usually sooner. We use a selection of shipping services such as UPS, FedEx, USPS etc We offer free shipping to the lower 48 states and ship within 1-3 days of payment, usually sooner. For shipping outside of the continental USA International customers are responsible for all duties and taxes. Return You can return a product for up to 30 days from the date you purchased it. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. Return Policy ? We guarantee against any defective or misrepresented products. The original shipping label must be sent back to us to validate the return. A full refund can only be issued during the first 30 days upon receipt of the product. ? Returns will be voided if the product is mishandled or physical damaged by customer. ? Buyer will be responsible for all kind of return shipping/shipment to the seller for resolving the problem. ? Returns made for all non-defective, undamaged products are subject to a 15% restocking fee. Shipping and handling fees are absolutely non-refundable. If an item is returned to us due to an address issue, we do charge a reshipping fee to reship. If you would like a refund, there will be a 15% restocking fee applied. ? All returned products need to be assigned an RMA # (Return Merchandise Authorization #) prior to return. Please contact us through's messaging system to obtain an RMA# for the return. Any returned product without an RMA # on package will not be accepted or processed? Please contact us before returning. Payment We accept payment by any of the following methods Please pay as soon as possible after winning an sale, as that will allow us to post your item to you sooner! Feedback Customer satisfaction is very important to us. If you have any problem with your order, please contact us and we will do our best to make you satisfied. Feedback ? We appreciate your feedback and our system will automatically leave feedback for you after bid ends. ? Please contact us through message center if you have any problems, we will always try our best for 100% customer satisfaction. Contact Us If you have any queries, please contact us via. We usually respond within 24 hours on weekdays. Please visit our store to check out other items for sale! Thank you for shopping at our store.