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Larry J. Gallant
Reviewed in the United States on February 8, 2025
The unit has no preprogramming for AGM batteries so you need to use the “USER” (custom) parameter selection which is okay except it has no BULK voltage setting available, only ABSORBTION and FLOAT levels.
Wheels in Idaho
Reviewed in the United States on January 15, 2025
The 40A MPPT Charge Controller with Auto Parameter Adjustable LCD Display is a top-tier choice for those serious about optimizing their solar power systems. Designed to handle up to 40 amps, this charge controller efficiently manages the flow of electricity from solar panels to various battery types, including AGM, SLD, GEL, LiFePO4, and SEL. Its advanced Maximum Power Point Tracking (MPPT) technology ensures high efficiency, maximizing energy harvest by up to 30% compared to traditional controllers.The user-friendly, auto-adjustable LCD display is a standout feature, offering real-time monitoring and customization of parameters. This display simplifies the process of managing and optimizing solar energy usage, making it accessible for both beginners and experienced users. Additionally, the included temperature sensor further enhances efficiency by adjusting the charge rate based on ambient temperatures, thus extending battery life.With compatibility for both 12V and 24V systems, this charge controller provides flexibility and adaptability for various solar setups. Overall, this device offers a robust, reliable, and intelligent solution for effectively managing and optimizing solar energy, making it an essential component for sustainable energy enthusiasts.
Palm Harbor Appraiser
Reviewed in the United States on December 27, 2024
I used this with 2 of my 4 100w panels and a whole house battery bank. The charge controller seems to handle the parameters automatically. Not charging very fast, but that is due to the insufficient solar setup and lack of a good amount of sun. The charge controller is very light, although others I have had in the past, had a similar lightweight feel to them. Plastic body and a circuit board, can't weigh much. I would try to sick with an MPPT controller over a PWM for much better conversion efficiency.
Avid couch surfer
Reviewed in the United States on December 13, 2024
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Thomas H. Lawler
Reviewed in the United States on November 1, 2024
Many controllers are labeled with "MPPT" features, but will say in the directions "Max input voltage for 12V system-22V" showing they only allow panels to be connected in parallel. This controller allows you to wire up to 5 panels in series (100W each) and will accept power like 90V 5A input that it converts to ~14V 33A charge to the battery (or for 24V system it can accept 2 groups of 5 panels like that giving ~28V 33A charge to batteries). The max open circuit voltage allowed is 150V, some other units only allow 100V (limiting you to 4 panels in series). The advantage of panels in series is that the wiring to them carries the 90V at 5A where the wire size only needs to handle the 5A like 4 or 12 gauge (if you had them in parallel with 25A you'd need ~8 gauge wires that cost much more). They include some wire sleeves for install if you want.They do say these are OK for use with lithium and lead batteries. One note that I want to warn many of is the built-in BMS on most lithium batteries. The BMS (Battery Management System) will monitor things and can stop power flow if it decides the battery is drained or getting "overcharged". While I understand them having that, many controllers like this say to "Always connect the battery first, solar second and reverse that for disconnecting" even emphasizing "Never disconnect the battery while charging". Yet I've had a cheaper controller with a solar panel charging one and seen the voltage suddenly go from ~14.4V to 22V (open circuit) from the BMS suddenly blocking power. If I had this controller connected while that happened, I'm afraid it would get fried from that sudden disconnect. I've tried asking several battery OEMs things like "Should we limit the feed to 14.1V to insure that doesn't happen?" but got no response. A lower voltage may seem good, yet it's not allowing a full charge (if you want it to go "full"). I've thought of keeping other batteries in parallel, yet many respond with "You don't want a mix of lead and lithium batteries together". So not sure what a good solution is to that problem that does exist (despite being ignored by the OEMs like I've made up something that can't happen to anyone else). So beware that trap you could get into.
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