HQST 100A MPPT Solar Charge Controller, 12V/24V/36V/48V Negative Grounding Controller, w/ Smart Bluetooth APP Control, Low-Temp Cut-Off, LCD Display, for Lithium, Sealed, AGM, Gel, Flooded Batteries

The HQST 100 amp charger controller has all the features: reverse polarity circuit protection for both the battery & solar inputs ($aves you if you plug the wires in backwards.) Victron controllers only have reverse polarity protection for the solar input... Not the battery and it cost me Built in Bluetooth (I get good range) Free app download. 150 volt input let's me put six(6) 12v 100w panels in series on each string Which Improves efficiency & reduces the current allowing smaller wire size (saves $$$) and less need for "Y" connectors (for parallel) 6x20volts= ~120volts The HQST controller allows syncing multiple controllers together: I have two HQST (80 &100A) hooked together w/no problems (I'm not using the sync feature) My old 12v system has 4 Victron controllers working together. The only negative is that the history page of the ChargePro app is faulty: it seems to be populated w/random data ( except today's charge total) Compare this controller's features & price to any other & it's a bargain. Update: Aug 19, 2025 i upgraded my system to 48v and have over 4000watts of solar connected to the 80A model (via a combiner box) controller for about two months: no problems; i manually selected Lithium ... my batteries are LiFePO4; the Bluetooth range is good ( ~30ft max); i bought an HQST 100Amp controller (which shares a manual w/80amp version) which i will add in parallel to the 80A model as soon as additional solar panels arrive. SOLAR panals i use: Renogy ( at first but too expensive); JNN, HQST; Eco-Worthy; NICE. ALL THESE PANELS WORK & PLAY WELL TOGETHER! i am using 2 Eco-Worthy 48v (51.2v) 50Ahr batteries because they weigh less than 60lbs & i can pick them up by myself! my inverter is a Victron 3000VA (2400watts) OLD Review: i have the HqST 80 amp controler, (12/24/36/48Volt) running for 2 days now as an add-on to my 12v system: just 4 panels hooked up, but i will add more & plan to test the 48v capabilities in the future. the HQST is running alongside Renogy, & Victron, controlers & they play well together. the hqst control has nice big wire sockets, built in Blue Tooth. set up was easy although my AGM batteries were auto detected as 12v gel types. i downloaded the ChargePro2 app from the Google playstore; its a basic App & to connect i touched the BT icon in the upper right corner, then got a display of all my Bluetooth devices... i selected the Chargepro ( that's what the hqst controler shows up as.) and was connected. App shows the basic info: Volts, current, watts, battery info. this app can handle just 1 controller at a time: victron's app can show multiple devices onscreen together. i will be updating this review as i go about adding panels & batteries.

This thing is absolutely amazing! I just got into solar and bumped my status from hobby grade to a solid small 3.45kW worth of panels. I needed a controller that could handle this and future expansion. This was the answer. Not full of a ton of bells and whistles like the others but Bluetooth is nice to have. The app is ok to use but has little features outside of the main setup, regardless it's easy to setup. The ability to have this much capacity for the this little money is s great value. If I need more midsize deployments, I'm certainly going to use these units here.

Great customer service. When I read about this unit, I really liked how it had pretty good reviews. It worked fine and charged the batteries with no issues. I also liked the fact that the Bluetooth interface worked great. However, a few weeks after the installation, it started giving an error. After I figured out what the error was, I knew something was wrong with the unit. I contacted customer service to explain the situation. They were very responsive to my issue. After running a few tests with them, they determined that the unit was defective and sent me a new unit.

Reliable and at a good price.

I got this mppt to replace an older pwm controller I had in service for a long time. I have 150 watts running into it at 12 volts on my sailboat. The digital readout works and the buttons are high quality to select what is seen on the screen. You can select preset charging profiles by holding down the settings key and scrolling. It does have a blue tooth module inside the unit which was a sell for me. Most mppt in this price range require a separate purchase of of a module which is run off a communication cable. I doubt the range is very good for the bluetooth but most aren't . Its installed on a 37' boat and the range is good aboard. The PVcharge Pro app is straight forward, you can monitor realtime and history, as well as set up charge profiles. the code for changing settings is 123456. I would recommend the 20 amp for small setups, and I am planning on purchasing two or three of the 40 amp models for running in parallel in a larger off grid setup for my house. at 24 volts they could run 1200 watts each pretty good for $100 with bluetooth.

The unit seems efficient, low quiescent current draw and runs cool. My only complaint is the "Load" control in that there is, apparently, no readily accessible way to turn it on and off if you have it set up to come on at dark and run for X number of hours. A convenient load "On/Off" button would be very welcome. Edit 12/7/21: This unit (the M2420N) does NOT include an integral Bluetooth Module, as advertised. I returned my initial unit for a new unit that I was assured would have Bluetooth, but it did not. Apparently, none of this model do, so I returned the new unit that I'd been sent and kept the one I had already installed. I did get compensation from Amazon for lack of Bluetooth, so be forewarned. After further review of the manual, there is a setting to be able to turn the "load" control on and off with a keypress...unfortunately, that then disables the "auto on at dark" mode and you have to go in and reset that. A more aggravating thing that I discovered is that there is, apparently, no way to easily reset the cumulative charging and load power values back to "0"...at least nothing I could find in the manual.

This solar controller seems to do really well. The app could use more features. You have to be fairly close to connect to it via Bluetooth. But it is nice to get data on it live. I might use an old cheap smart phone connected to it in my bedroom and mounted on the wall for easy reference and viewing.