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November 29, 2017
I use this boost converter to help charge my 24-volt battery bank from the 18-volt solar panel input to my grid tie inverter. During the day with Sun on my solar modules my 24-volt battery is mainly charged by a Tracer charge controller on dedicated solar panels. My shop / Man Cave is run by solar --> batteries --> inverter only. I set this boost converter to help with short duration high demand during the day and use an AC power supply as input to the unit at night to charge the batteries. I am on peak power with the power company from noon to 7:00 pm and run on batteries during this period and fully recharge the batteries after 7:00 pm. This power program currently saves me over $80.00 a Month on my power bill in the high desert with two large evaporative coolers on thermostats. Pros: The unit works, it is easy to program, multiple program sets can be stored for easy retrieval, the display brightness level can be adjusted and the display can be turned off while the unit is in the ON state. The noisy fan level can be adjusted, I set mine at minimum and it runs cool. Cons: The unit does not lock in the power (APL) and searches constantly while on solar, this searching moves the voltage and current around constantly also. If the solar panels cannot supply the needed current (set) then the unit drops power to zero and starts ramping up again, this is inefficient. While in constant current mode (cc) the unit many times does not maintain the programmed current, cc should be the priority and rock solid. At times I find I have to turn the unit off and back on to correct the issue. The fan is very noisy -- (My Tracer charge controller handles many amps of current with no fans or noise).
September 27, 2017
Read other reviews for general overview of the unit. I wanted to just make sure to point out one important thing. I would not recommend adjusting the fan speed setting. At default fan runs on high which is loud and speed exceeds my application needs for cooling as I'm limiting the output current to 3.5amps. However when you reduce the fan speed the unit has an issue in which it reads the input voltage. The lower you reduce the fan speed the greater the fluctuation in voltage the unit reads. The serious issue I observed as a result is the output voltage to my battery jumped wildly for 20v to exceed 60v and back and forth rapidly. The upper voltage swings also exceeded the voltage output setting. This was obviously of great concern as it would ruin the battery or worse as I had it on a lithium ion pack (potential of fire!). Every other aspect of the unit runs as expected as long as you don't reduce the fan speed setting. As every other aspect of the unit works correctly my assumption is this isn't a faulty unit rather a design flaw, however that is my assumption. I did not return and test another unit as restoring the fan speed to the default high speed resolved the issue.
September 20, 2017
If you are trying to charge high voltage lithium ion batteries using commonly available solar panels this unit is about the only thing I have found that will do that. And it does it well most of the time. The one major issue with it is even the tiniest dip in solar panel output will cause the unit to reset. Its so sensitive to this that even a bird flying over the panel causing the most minute amount of shade for a brief moment will cause it to reset. When it resets it takes a good 5-7 seconds for it to begin charging again. So if you have alot of rolling clouds and sun, this can make it a lot less efficient than a higher quality MPPT controller. However, for the price I paid for it and its capabilities, its still an amazing value. In good summer sun with a cloud here and there I can get a 52v 11.5 battery charged in 2 days off a 100w panel. Not bad at all! *There are some youtube videos floating around showing where people have replaced the input capacitors with bigger ones to help with the reset issue. I haven't tried this yet but I might order another one and attempt to mod this thing.
By Sean Maddox
March 21, 2017
Relatively confusing setup and the manual really isn't clear; however, for 37$ this thing is amazing. Ensure a few things: 1. Be sure your solar panel voltage is lower than charged battery voltage. The actual panel output is the lowest max charge voltage you will get, regardless of settings. 2. Minimum 24v battery voltage. Seems to always boost at least to 24v. 3. SET the ON state. If you don't you will have to turn it on every morning. This little bugger really gets the job done on a dime. I average about 200w charging output during the day from 9am- 3pm in my area, it's a great little charger for a small system. I use it to power 100w of pond pumps and some led landscape lighting, and automatic irrigation. Be aware that the battery charge level indicator lies, it basically just measures number of amp hours charged. You have to sort of set the AH setting to the total AH discharge over night for your load for it to be useful at all, and that is only very rough in case of extended low power cycles (cloudy days). Invest in a charge meter/bilt meter display for your batteries, And a buck converter to run 12v loads. Still, you're all- in a 250w system for 60$ plus batteries.
By New Quilter
March 20, 2017
Shipped rather quickly and did what I needed it to do, I have only used it for a day and will update if it fails in the near future but so far I'm pleased. This thing is cheap and allows for higher voltage panels (mine is 75w but 55.5 volts) to be used with lower voltage banks or for higher voltage banks and lower voltage panels. This is DIRT CHEAP and there is no need for poking at the flaws as it's very functional even if the user interface isn't super intuitive. O have not however gotten it to convert the excess voltage into amps like my MPPTs do, I guess I will poke around in the settings more to see if that's an option.
March 17, 2017
This item is more suited for 24 volt or above storage batteries in a solar system. It has a lot of bells and whistles. You will have to study the You Tube videos to understand all the settings. It can be used to charge a lead acid battery, but is more suited for delicate charging of lithium ion batteries which use the constant current/constant voltage (CC/CV) cycle to properly charge. Docooler sold us the unit at a reasonable price. It is not well understood, so plan on studying it well. The manual isn't that easy to understand.
March 14, 2017
I use this to charge a 52v nominal lithium-ion battery pack up to around 56-58 volts using CC/CV. It works pretty well. I recommend checking out some YouTube reviews from Julian Ilett about it -- he has 3 videos on how to use it and it's easier to learn from the videos than by trying to decipher the instructions on eg setting the charger to stay on if power is momentarily interrupted. The controller resets sometimes if there is a change in input voltage (clouds), so having it continue to charge after resetting is critically important. While I use a 12v 100 watt solar panel as the input power supply, you can use any DC power source with a lower voltage than your output power. So for example you could use a common 12v DC power supply to charge a higher-voltage battery bank, and if you have multiple devices with different voltages, you can configure this to charge them all. Great value for the money.
March 14, 2017
Great charge controller, just don't believe the reviews that say it works with a single 12v battery, it does not. It will constantly try to put at least 20v into it when the sun is out, which would overcharge a 12v battery quite fast. As for 24v use, this unit is awesome. Truly a MPPT charge that keeps charging as the sun is setting, amazing! TONS of features and love the color screen. Just don't think you can use it on a 12v battery even though the specs may make it seem like it COULD...it won't. 24 volt and up and your golden!
March 9, 2017
A lot of people don't understand how this thing works, and thus negative reviews when it doesn't do what they were hoping. It doesn't help that the manual is poor, the specs don't fully explain everything, and that this is essentially the first boost converter MPPT on the market (most MPPT controllers are expensive buck converters or simply non-MPPT PWM charge cut off devices). This genuine MPPT controller uses a DC-DC boost converter topology. That means battery voltage MUST be higher than the maximum open circuit solar panel voltage, otherwise there will be no way for the charge to terminate when the battery is full. A boost topology controller connects the solar panel directly to the battery through a diode and an inductor. This controller can increase the output voltage, but it can not reduce the voltage. So if you want to charge a 12.7V lead acid battery, for example, you're going to run into trouble terminating charge unless you've somehow managed to acquire a 15 to 19 cell panel, which is not a very common solar panel design. 19 cells will output about 12.3V max open circuit, above which this controller will thus be able to terminate charging your battery. Most standard "12V" solar panels contain 36 cells, producing about 18V, which will pass right through a boost converter and into your already fully charged 12V battery. In my bench testing of this controller, about 9.5V minimum input is required for the controller to boot up. So, there isn't much tolerance for solar panels with less than 19 cells. Below 15 cells the controller would never power itself up due to the 9.5V minimum input voltage being more than such a solar panel's max open circuit voltage. The user's manual is pretty poor, so it isn't obvious how to save your settings such that the controller powers up in the morning and automatically starts charging your batteries with correct settings. However, it IS possible to do. Watch Julian Ilett's YouTube videos about the MPT-7210A controller to see how. It would've been nice if the controller had a temperature sensor to dynamically operate the cooling fan. But at least you can adjust the fan speed setting in the user interface. You could also completely disconnect the fan wire by opening the unit up and pulling the fan connector off the mainboard. So far during my bench testing at up to 120W, my controller has not even gotten warm yet.
November 29, 2017
November 14, 2017
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By Daniel Sanchez
September 13, 2017
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