Simple, cheap, and honest about what it cannot recover · review
Thlevel 30 A PWM, 12 V/24 V, 133 × 70 × 35 mm review
A 30 A PWM controller with published dimensions and weight, a 5 V 2 A USB output, adjustable charge and discharge parameters and three-stage PWM management.
The bottom line The only controller in this catalogue whose physical size is published, with proper three-stage charging and adjustable parameters on both sides. It has no display at all, and no PV ceiling.
A 30 A PWM controller specified by size as well as by current.
The measurements
133 × 70 × 35 mm, 132 g. Eleven controllers in this catalogue and one of them tells you how big it is. A charge controller lives inside a box with cables entering it, and its dimensions are the first thing that box needs.
Three-stage charging
Full three-level PWM charge management — bulk, absorption, float. That is the correct sequence for lead-acid, and it is what stops a battery being held at charging voltage indefinitely. Named explicitly in the second bullet.
The reverse-current design
Dual MOS reverse-current protection, with low heat generation and a low failure rate given as the reason. That is a design statement rather than a feature list, and it addresses what happens at night when the panel voltage falls below the battery.
No tracking, and what that costs
A display. Nothing is described, which means status has to be read from indicator lights or not at all. Combined with the adjustable parameters, that makes it a set-and-forget controller rather than one to watch.
And what is missing from every controller here
The maximum PV input voltage.
Availability
German, French, Italian and Spanish Amazon stores quoted 12 € to 17 € when this page was compiled.
American and British Amazon catalogues carry an entry for it, with nobody selling.
These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.
Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.
What it gets right, and what it leaves out
Strengths
Dimensions and weight are published, which only this controller in this catalogue provides
Dual MOS reverse-current protection is named, with low heat generation given as the benefit
Both charge and discharge parameters are adjustable
Compromises
No display described, so the controller reports nothing visually
No maximum PV voltage
No terminal capacity at 30 A
Specifications
Charge current
30 A, first bullet, with a USB output at 5 V/2 A maximum
Panel voltage matching
Automatic 12 V and 24 V identification, first bullet; no PV voltage ceiling is published
Battery profiles
Lead-acid only, stated as a note in the first bullet
Load output
Present with adjustable discharge parameters and a settable charging mode, third bullet
Control
Built-in industrial microcontroller with full three-stage PWM charge management, second and third bullets
Display
Nowhere in the listing — no display is described
Protections
Short circuit, open circuit, reverse connection and overload, second bullet
Terminals
Absent as a capacity; dimensions 133 × 70 × 35 mm and weight 132 g are published
Amazon reference
B08GQTZDVH (same reference on 6 Amazon marketplaces)
EAN
0711731468495
Questions owners ask about this one
What is three-stage PWM management?
Bulk, absorption and float: charging hard until the battery approaches full, holding a voltage while the current tapers, then maintaining. It is the standard sequence for lead-acid, and a controller that only bulk-charges will overcharge a battery over time.
Why publish dimensions on a charge controller?
Because it usually goes inside something — a battery box, a locker, a cabinet — with cables entering and leaving. 133 × 70 × 35 mm and 132 g answer that before the box is built. Ten other controllers in this catalogue publish neither.
20 A charge · 12 V/24 V lead-acid · five standard battery types including LiFePO4 · USB output · Bluetooth with mobile application · display present · over-voltage, over-current, charge short circuit, short circuit · terminals not described
A 20 A PWM controller with Bluetooth and charge statistics, offering five standard battery types including lithium iron phosphate, with a named iOS application.
Best for: A small lithium bank on a PWM budget, where the statistics matter more than the current.
30 A charge · automatic 12 V/24 V matching · lead-acid ONLY, lithium explicitly excluded · load output with timer · industrial microcontroller · LCD · over-current, short circuit, open circuit, reverse, low voltage, over-charge · terminals not described
A 30 A PWM controller for 12 V and 24 V systems with a timer, whose third bullet states in capitals that it must NOT be used with lithium or nickel batteries.
Best for: A small lead-acid installation — a shed, a gate, a caravan — where simplicity is the point.
80 A charge · 12 V/24 V · battery profiles not published · load output not described · control not described · LCD display · protections not published · terminals not described
An 80 A solar charge controller for 12 V and 24 V systems with an LCD display, whose listing consists of a single bullet repeating the title.
Best for: Nothing this page can identify, which is the finding rather than a judgement on the product.
