The Renogy 40 Amp Commander MPPT Solar Charge Controller is compatible with any deep cycle battery and it will keep the batteries from becoming over charged or discharged. 
This of course will increase battery life and help you save money.
The Renogy 40 Amp Commander Charge Controller uses what is known as “Multiphase Synchronous Rectification and Maximum Power Point Tracking” technology. What that means is that this solar charger will both increase charging efficiency and improve system performance.
Product Features and Specifications
- Product Dimensions: 11.9 x 2.5 x 7.2 inches
- Shipping Weight: 6.4 pounds
- Advanced maximum power point tracking technology with high tracking efficiency up to 99%.
- Multiphase synchronous rectification technology ensuring peak conversion efficiency up to 98%.
- Reverse protection: Any combination of solar module and battery, without causing damage to any component.
- Electronic protection against overcharging, over-discharging, overload, and short circuit.
- This controller’s default battery parameters are set to Sealed Lead Acid. In order to adjust the parameters, Renogy’s MT-50 Meter will be needed.
The Reviews
When researching the Renogy 40 Amp Commander MPPT Solar Charge Controller we were only able to find a handful of reviews online, but the initial reviews are pretty strong. This product received an average rating of 4.4 out of 5 stars.
One review came from a customer who said that they are new to solar, but the Renogy 40 Amp Commander Charge Controller does work as advertised and he had no problems getting it up and running. When he did have a question, their technical support helped him out in a timely fashion.
Another review came from a customer who is a ham radio operator and he said that he went through four different charge controllers trying to find one with little RFI noise. He finally found what he was looking for in the Renogy 40 Amp Commander Charge Controller. He said that he turned on all of his radios looking for noise but did not find any noise that was created by the controller. He’s very happy that he was able to find the right piece of equipment that would work the way he wanted it to.
Another positive review came from a customer who said that he was using the Renogy 40 Amp Commander Charge Controller with a 100 watt flexible solar panel and a deep cycle battery in a do-it-yourself greenhouse.
Not only is he satisfied with the product, but he also said that phone support from the manufacturer was very good. He also said that he would not hesitate to purchase from this supplier and manufacturer again.
At the time of this writing we were only able to find just over half a dozen reviews for the Renogy 40 Amp Commander MPPT Solar Charge Controller, and we would normally like to see more reviews but so far, the majority of reviews are very positive and are mostly 4 and 5 star ratings.
According to our research, the Renogy 40 Amp Commander MPPT Solar Charge Controller seems to be a quality product and it is definitely one worth considering.