I have had 2 of these 80 amp units running for around 2 years now. started off using them as 12 volt for about a year and a half. now they are switched over to 48 volt. they have been running flawlessly.
when in 12 volt i had 12, 100 watt panels wired. series parallel.
now that i have it in 48 volt i can atleast double the amount of panels in each string, so 2 rows of 12.
when i need more power ill be buying more of this same brand.
ive had bad luck with much more expensive charge controllers.
it takes a little time getting used to how to getting the settings correct for your battery bank. but this charge controller is super forgiving and wont just fry itself if you get something wrong the first try.

I like this little inverter and, for what I need which is a fairly small back up system, it does great. Currently have it on 2 12 volt 100 amp hour batteries and plan to add two more. Also only have about 450 watts of panels but plan to add on to that as well. Great item for the price.
Update: 11/29/2023. I ordered the wifi adapter, took quite a while to arrive. When I got it I tried finding the app they said to download, never could. I have an iphone, I guess this wifi adapter does NOT work with iphone but odd I couldn't even find the app. Looks like I have a $59 paperweight as it is. Will try to contact support about returning. Just make sure you have an android if wanting the wifi connector dongle. Removed 1 star for this reason. Guess I will get a battery shunt and go that route.

I am absolutely thrilled to be writing this review for the 40A Solar Panel Charge Controller MPPT, a product that has truly revolutionized my off-grid power experience. This impressive piece of technology has become an indispensable part of my solar setup and has certainly earned its 5-star rating.

This controller is a marvel of solar technology. It's robust, designed to handle up to 150v PV input, which is more than enough for my setup. I'm using it with four Neo Solar Panels (Model D6M335E4A) - each cranking out an impressive 335 watts. The controller handles the combined power of these panels with ease, efficiently regulating the power and charging my battery bank with no hiccups.

What sets this charge controller apart is its MPPT (Maximum Power Point Tracking) technology. The MPPT ensures that I am getting the most out of my solar panels, regardless of the weather conditions. It's remarkable how it optimizes power extraction, even in the face of fluctuating sunlight conditions - I've noticed a significant improvement in my overall power collection since I started using it.

The flexibility of this controller is another big plus. It's capable of handling 12v, 24v, 36v, and 48v systems, making it an excellent choice for a wide range of setups. I'm using it with a 12v power inverter rated for 5,000/10,000 watts, and it integrates seamlessly.

Another commendable feature is its versatility when it comes to battery compatibility. It's designed to work with Sealed, Gel, AGM, Flooded, and Lithium batteries. My setup includes four 6 Volt 215AH batteries, and the controller manages them brilliantly, maintaining an optimal charge level and maximizing their life span.

The user interface is intuitive and straightforward, making setup and monitoring a breeze. It's also worth mentioning the high-quality build of this controller. It feels sturdy, well put together, and designed to last - an essential quality given the harsh conditions it can often face in an off-grid scenario.

In conclusion, the 40A Solar Panel Charge Controller MPPT is a high-quality, versatile, and efficient device that has significantly enhanced my off-grid power setup. It pairs perfectly with my solar panels and inverter, and it manages my battery bank like a charm. If you're looking for a reliable, efficient, and high-performance charge controller, this one certainly fits the bill. Five stars well-deserved.

I have only had this product for a week so this review is based on my experience and perspective within this time frame. I update my reviews should impressions change.

This product is a good purchase. It is packaged very well and the instructions are clear and concise with easy to understand graphics and proper warnings for safety.

The product is manufactured with high standards. Fitment and finish is above standard and the quality of the interface, fasteners, labels, mounting and safety factors are also above standard.

This controller is designed to handle multiple voltage inputs as well as multiple voltage outputs for energy storage. This lends flexibility to the user for all types of situations and the product description is accurate to these details.

The user interface is easy to understand and the software is configurable for all scenarios. This is not an ordinary basic controller. It is an advanced electronic controller which is required when designing a custom solar array.

This unit has many features and accessories that are nice-to-haves such as a remote temperature probe and remote serial connections for advanced controller setups (arrays/series/etc)

For the buy in cost, this is a very high quality device that should last. Keep in mind that this device is NOT rated for outdoor use but can be placed in an outdoor cabinet with ventilation.

At this time, I honestly find it difficult to find any negative aspects of this unit. My expectations are met and the unit does exactly what it says.

I needed a new solar controller after adding more panels to my remote installation. I did a bunch of reading and saw that this came out as highly rated with a repeating caveat that the fan can be noisy.

The build quality on this is great; it is metal construction and has the best terminals that I have seen - and I also have a far more expensive Morningstar unit installed. The screen is a bit dated but it is OK and has some interesting graphing for current and power metrics. It lacks some of the more advanced capabilities of higher-end controllers but at this price point, that is expected. If you want a solid unit that will do the job, this is probably the one for you.

I wanted a little more; I have a lot of automation in place so I needed to get the numbers from the controller into my automation system. The wifi unit that can be bought as an accessory and used with a phone app wasn't going to do the job so I needed to access the modbus via the RS485 interface. If you need to do the same thing, bear in mind that the protocols are not standard modbus. I have created the code which I will make available on Github shortly; search for Ampinvt and you will likely find what you need. I will add that while the support was clearly in China (based on time of response to messages) they were willing to help me figure this out and quite responsive, providing the protocol documentation that I needed.