PVCM40D-MPTLi: 40 amp Solar Charge Module using Multi Point Tracking


(8 reviews) Write a Review
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Product Sheet
Airstream Flyer:
Airstream Flyer

Product Overview

The PVCM40D-MPTLi solar charge controller is only compatible with the SEDM6-40 display. The SEDM4-25 and SEDM6-25 will show incorrect information. 

The PVCM40D-MPTLi controller is a drop in replacement for the two stage PVCM40D controller.

If you’re ready to update your trailer charge controller to smart 6 stage charging, here is a drop in replacement that keeps the factory look.

The 40 Amp solar charge module with Multi Point Tracking (MPT) controller (PVCM40D-MPTLi) is a rugged inline solar charge controller. It uses Pulse Width Modulation (PWM) to control the solar charge current. The controller delivers the maximum charging rates throughout each of the charging stages and connects between your 12VDC storage batteries. It is Ideal for RV’s, motor homes, trailers, yachts and off-grid applications such as small cabin sites. The charge controller is now programmed to work with Lithium batteries along with Flooded Lead-Acid (wet) batteries, Lifeline AGM batteries, and other brands of AGM batteries.

The PVCM40D-MPTLi is fully encapsulated and can operate in the wide temperature ranges and harsh environments. It is a micro-processer based, solar charge controller with temperature compensation that is used for AGM, LiFePO4 or flooded batteries. It automatically charges your battery to 100% and keeps the battery in float stage. If your battery gets too low, it goes into Automatic Boost Mode keeping your batteries full and extending the life of your batteries.

The PVCM40D-MPTLi micro-processor based solar charge controller connects between the solar panels and the storage battery(s). It performs 7 basic functions:

  • It monitors the solar panel voltage to know when it has enough to start charging the battery(s) and when to stop charging due to end of day.
  • It monitors the battery voltage to know if to enter a soft charge (battery voltage below 10.5VDC or enter the bulk charge routine, when to enter the absorption and float routines
  • It adjusts the PWM charge algorithms based on varying load and solar conditions to maintain the maximum charging rates.
  • It checks the available solar charge voltage every second to make sure there is sufficient voltage available. If not, it suspends the charging routine until the solar voltage increase or it drop below 5VDC which it then enters night or end of day routine.
  • It compensates for battery temperature and adjusts the charge thresholds voltages when mounted in the battery area.
  • It accepts the battery top-off command signal from the SEDM6-25 display to enter a charge routine to top off the battery(s).
  • On power up it checks its battery type dip switch and sets to correct routine for that battery type.

WARNING: Metal shavings left in the wall during install will cause damage to the display and will no longer be covered under warranty.

Product Videos


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  • 5
    Perfect replacement

    Posted by Bern on Apr 30th 2024

    Easy to install. Excellent instructions.

  • 5
    Perfect Replacement

    Posted by James on Jan 9th 2024

    Perfect replacement for our old solar controller that quit working. Airstream Base Camp Camper.

  • 5
    I am giving a 5 star rating as I am getting the proper charge and the unit has settings that can be set for specific battery groups. It has much better charging levels that the original which came with the trailer

    Posted by Gregg nowlin on Aug 4th 2023

    Very nice to be able to talk to and get advice on needs from folks/ engineers at the factory. Very helpful in information needed before and after the install. Unit was received in a few days as promised .

  • 5
    Atkinson Electronics Service

    Posted by Steven Fox on Mar 10th 2023

    In purchasing the PVCM40D-MPTLi: 40 Amp Solar Charge Module, I was apprehensive with installing the controller myself. Though, after talking to Abner at Atkinson Electronics, he navigated me through the process, step by step, and all that I would need to complete the installation, without fear, myself. Thank you, Abner and thank you A.E. for having great customer service. PS: Thank you "Peanut Gallery," too. :) S.E. Fox

  • 5
    PVCM40D-MPTLi: 40 amp

    Posted by Mark Gianforcaro on Aug 21st 2022

    Very happy with my purchase. This module was a direct swap for the Airstream factory installed module and I now have the benefits of MPT which keeps the batteries at 100% - much better than the factory PWM module. Plus I am able to continue using the Sunexplorer II display. I did have an issue with the module at first but customer service was excellent (Russell) and we were able to resolve the issue. Very happy with my purchase.

  • 5
    Solar Controller

    Posted by David Craig on Aug 8th 2022

    Great product, excellent service.

  • 5

    Posted by Brant Davison on Oct 5th 2021

    Easy replacement. Same size and attachment. Glad to see the addition of a fault light. Dip switch documentation should be made more clea graphically oriented with the actual switch. Good, responsive customer service.

  • 4
    is performing correctly

    Posted by Thomas sunkin on May 13th 2021

    That is performing correctly