Fast Shipping On All Items 30 Days Money Guarantee Customer Support Excellent Service 100% Satisfaction Satisfaction Guaranteed Negative Grounded Controller with Built-In Bluetooth and Lithium Battery Low Temperature Protection Function, Support Two Units in Parallel Specification 8.27 "h x 11.02 "h x 4.04 "h. Weight: 10.57 lb Item Description ?LCD SCREEN DISPLAY REMOTE MONITORING?- Built-in Bluetooth module, you can download the ??ChargePro 2.0'' (new version) or the "PVChargePro'' (old version) app for remote monitoring that keeps 300 days of historical data. PS: the app of android version needs to turn on location and Bluetooth to connect. HQST 48V 60A solar controller is equipped with an LCD screen and LED fault indicators, which can check device operating data and modify controller parameters. ?LOW TEMPERATURE PROTECTION FOR LI BATTERY?- HQST 60 Amp MPPT negative grounded controller offers overcharging/over-discharging/overload/overheat/short circuit/reverse protection and Lithium battery low-temperature protection. The maximum degree avoids the damage due to system fault or installation error. The BMS of low temp protection for Li battery automatically identifies low temperature, stops charging Li battery, and protects its life. This function can be switched on and off manually. ?PARALELL CHARGE FUNCTION?- 2 HQST MPPT controllers of the same series(M2420N/M2440N/M4860N) can work together to charge the same battery with the parallel charge cable (not included), to meet high power charging requirements and 2 controllers should set the same battery pack voltage. Compatible with Flooded, AGM, Gel, and Lithium batteries. User mode allows the buyer to set their charging parameters. 3-Stage Charging: boost, float, and equalization. ?HIGHER HEAT DISSIPATION EFFICIENCY FULL-LOAD WORKING?- Die-cast aluminum heat sink makes the heat dissipation efficiency higher, which can minimize the power loss from heat. Filling inside the controller with gel is for better PCBA cooling conduction and prevents water and other damages, extending the controller service life. With the premium IC and better PCBA, this controller can work under full load even at high temperature environment. ?HIGH TRACKING EFFICIENCY?- 48V 60 amp solar charge controller adopts advanced MPPT technology that ensures fast and stable track of of the maximum power point, high tracking efficiency of up to 99%, and peak conversion efficiency of 98%. Maximizing the energy from solar panels to charge your system. Automatically detects 12V, 24V, 36V, or 48V DC system voltages, which is suitable for RVs, Commercial Vehicles, Boats, Yachts, and any off-grid system. Product Description The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. hero-video Merchant Video Supports Parallel Wiring How to Wire Two HQST MPPT Controllers in Parallel Two HQST MPPT controllers of the same series support parallel wiring. Combinations like 20A+40A, 20A+60A, 40A+60A, 20A+20A, 40A+40A, 60A+60A all work perfect. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video Set the Parameters with Ease How to Modify the Parameters for Parallel Controllers 1. Plug in the RS485 cable turn on the parallel charging function. 2. Find the main controller. 3. Set the right battery type with the main controller, then the sub one's setting will change accordingly. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video Low Temperature Protection Test Auto-Identify Low Temperatures Stop Charging to Lengthen Battery's Lifespan The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. video Merchant Video HQST Solar System Add to Cart Add to Cart Customer Reviews 4.2 out of 5 stars 246 3.4 out of 5 stars 12 4.3 out of 5 stars 158 4.2 out of 5 stars 246 4.3 out of 5 stars 830 4.3 out of 5 stars 830 4.3 out of 5 stars 50 Price ? $229.99$229.99 $76.49$76.49 $186.99$186.99 $16.79$16.79 $22.00$22.00 ? Rated Solar Charge Current 40A 100A 20A 60A 20A 30A 30A Max. Solar Input Power 600W/12V, 1200W/24V 12V 300W/12V, 600W/24V 1800W/24V, 2600W/36V,3200W/48V 340W/12V, 680W/24V 450W/12V, 900W/24V 450W/12V, 900W/24V LCD Display ? / ? ? ? ? ? Built-in Bluetooth ? / ? ? - - - Dimensions 9.6 7.1 3.2 in 13.07 x 6.77 x 8.66 in 7.1 5.5 2.8 in 11 8.3 3.54 in 5.5 3.54 1.36 in 6.7 5.1 1.9 in 6.3 3.9 1.5 in Weight 4.4 lbs 22 lb 2.2 lbs 6.6 lbs 0.44 lb 1 lb 0.64 lb Why is my controller flashing the error message E02? It's normal that E02 flashes when the controller detects relatively high voltages. When a Li battery is fully charged, its BMS generates a relatively high volt (about 18V), then it will stop charging. This does no harm to your controller or battery. Flashing load light with an E04 error message, now what? E04 indicates that your appliance may have triggered the controller's short-circuit protection. Press the 'Return' key on the controller, or disconnect the appliance that's being powered, then the controller will resume normal work 30s later. How to Connect Bluetooth (BT) For Android Users: 1) Allow location first, 2) Tap the BT icon in the app, 3) Select PVChargePro. For iOs Users: 1) Tap the BT icon in the app, 2) Select PVChargePro. DC load stops working, What can I do? Four Solutions For You: 1.Set the load mode to 17. 2.Check the indicators for abnormalities. 3.Press the 'return' key on the controller. 4.Open ChargePro2.0, enter the Real-Time Monitoring page, and turn off the DC Load Short-circuit Protection. 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. 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. Payment Options Shop With Confidence