SRNE ML2440, 40 Amp MPPT Digital Solar Charge Controller

Price: $180.00

Availability: In Stock

40 Amp SRNE ML2440 Digital MPPT Solar Charge Controller.

At LightHarvest Solar, we use our off-grid showroom to test products, so we know what's the best, and the SRNE MPPT controllers are our current favorite at any price.  Let me tell you why:

-BIG, relavent display, this is a big deal because we HAVE to be able to easily see our battery voltage at all times, it's our fuel gauge. This controller also displays Amps into your battery which is your rate of recharge, very nice to know. Some controllers flash endless irrelevant data, most have tiny numbers, some don't have meters at all. This is where most controllers fall short.

-True MPPT,  tons of controllers on the internet are not MPPT but are marketed as such.  These SRNE controllers are not only true MPPT's but the best we've seen with all the right features. Efficiently converts up to 100 Volts down to 12V, 24V and bumps that amperage way up.  At LightHarvest Solar, the SRNE ML2440 is our current go to import 40 Amp controller and is perfect for the bigger, better, cheaper, industrial grade 60 and 72 cell panels, up to 550 Watts at 12 Volts, 1100W at 24V.

-High Quality, Low price,  What more do we want?

-Pre-Programed charging profiles,  Supports Lithium (the only way to go), AGM, Gel, or Flooded Lead Acid batteries PLUS fully programmable voltage settings for those non-standard batteries and experimenters.

The SRNE MPPT's  also come with remote battery temperature sensor. 

Don't forget our feature packed remote meter for $35, available for the data hungry or when you have to tuck the controller out of sight.








System voltage

12V/24V Auto

No-load loss

0.7 W to 1.2W

Battery voltage

9 to 35

Max. solar input voltage

100V (25°C), 90V (-25°C)

Max. power point voltage range

Battery voltage +2V to 75V

Rated charging current




Rated load current


Max. capacitive load capacity


Max. photovoltaic system input power

260W/ 12V

520W/ 24V

400W/ 12V

800W/ 24V

550W/ 12V

1100W/ 24V

Conversion efficiency

≤ 98%

MPPT tracking efficiency


Temperature compensation factor

-3.0mv/ °C/ 2V (default)

Operating temperature

-35°C to +45℃

Protection degree






Communication method



≤ 3000m

Product dimensions






 ◆ With the advanced dual-peak or multi-peak tracking technology, when the solar panel is shadowed or part of the panel fails resulting in multiple peaks on the I-V curve, the controller is still able to accurately track the maximum power point. 
◆ A built-in maximum power point tracking algorithm can significantly improve the energy utilization efficiency of photovoltaic systems, and raise the charging efficiency by 15% to 20% compared with the conventional PWM method.   
◆ A combination of multiple tracking algorithms enables accurate tracking of the optimum working point on the I-V curve in an extremely short time.
◆ The product boasts an optimum MPPT tracking efficiency of up to 99.9%. 
◆ Advanced digital power supply technologies raise the circuit's energy conversion efficiency to as high as 98%. 
◆ Charging program options are available for different types of batteries including gel batteries, sealed batteries, open batteries, lithium batteries, etc.
◆ The controller features a limited current charging mode. When the solar panel power exceeds a certain level and the charging current is larger than the rated current, the controller will automatically lower the charging power and bring the charging current to the rated level. 
◆ Instantaneous large current startup of capacitive loads is supported.
◆ Automatic recognition of battery voltage is supported.
◆ LED fault indicators and an LCD screen which can display abnormality information help users to quickly identify system faults. 
◆ Historical data storage function is available, and data can be stored for up to a year.
◆ The controller is equipped with an LCD screen with which users can not only check device operating data and statuses, but also modify controller parameters.  
◆ The controller supports standard Modbus protocol, fulfilling the communication needs of various occasions.
◆ The controller employs a built-in over-temperature protection mechanism. When temperature surpasses the set value, the charging current will decline in linear proportion to the temperature so as to curb the temperature rise of the controller, effectively keeping the controller from being damaged by overheat.
◆ Featuring a temperature compensation function, the controller can automatically adjust charging and discharging parameters in order to extend the battery's service life. 
◆ TVS lighting protection


Since we test so many products, we have come to find that about 1 in 4 "internet" charge controllers work as advertised, about 1 in 10 we like, and only the rare few we will sell.  At first, we sold the black ones with gold faces, but they got hot and the screen went dark.  Then we sold the Tracer series with no meters, good but expensive and feature shy.  Then we sold the EP series but those had 1 serious flaw and could not develop full power in low light. We've tried a big list of other controllers too, they range from OK to D.O.A . 

Of course, price, and functionality absolutely have to be top notch and the SRNE's have excelled where others fell short.  Right out of the box the quality is apparent.

Remote meter available for the data hungry or when you have to tuck the controller out of sight.

All controllers have a down side, and the SRNE has pesky terminals, so be patient there.