A 20 A PWM controller with Bluetooth and charge statistics, offering five standard battery types including lithium iron phosphate, with a named iOS application.
The bottom line A Bluetooth PWM controller with five chemistries including lithium and a genuine statistics function. Its protection list is the thinnest here, and its first bullet is about the cost of its own raw materials.
A 20 A PWM controller sold on its application.
Five chemistries, including lithium
Sealed lead-acid, gel, flooded, lithium iron phosphate and one further type. On a PWM controller that is generous — two others in this family exclude lithium outright — and it means the charging voltages are settable for a LiFePO4 bank.
The statistics
Charge statistics, displayed and available in the application. A history is worth more than a reading: it shows a panel getting dirtier, or a shadow arriving as the season turns, which no instantaneous voltage will.
The application, named
LM Solar, identified for iOS in the fourth bullet. Naming an application means it can be looked up and its reviews read before the controller is bought, which most listings here make impossible.
The list that is short
Four protections. The Depvko in this family names six and describes them all as self-recovering; the Fuhuihe MPPT in this catalogue names six as well. Four is the shortest here.
The bullet about nothing
The first describes the cost of the raw materials being almost double that of competitors. That is a claim about a supply chain, not about a product, and nothing on the page connects it to a measurable characteristic.
Availability
German, French, Italian and Spanish Amazon stores quoted 24 € to 30 € when this page was compiled.
British Amazon store carries it too, priced in its own currency, which the euro range above deliberately omits.
American Amazon store returned nothing at all, so the buy button there runs a search instead of landing on an empty page.
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
Five battery types including LiFePO4, on a PWM controller where lithium is often excluded
The application is named for iOS, so it can be checked before buying
Charge statistics rather than only live values
Compromises
The protection list is the shortest in this family — four items where others name six
The first bullet argues about raw material cost rather than describing the product
No PV ceiling and no terminal capacity
Specifications
Charge current
20 A, from the title
Panel voltage matching
12 V and 24 V lead-acid systems, second bullet; no PV voltage ceiling is published
Battery profiles
Five standard types — sealed lead-acid, gel, flooded, lithium iron phosphate and one further — second bullet
Load output
USB port named, from the title; no load current is published
Control
Imported original chips with low power consumption and a reliable circuit design, first bullet
Display
Present with charge statistics, from the title; the fourth bullet names the iOS application
Protections
Over-voltage, over-current, charge short circuit and short circuit, third bullet — the shortest protection list in this family
Terminals
Nowhere in the listing
Amazon reference
B0FFSRJDNW (same reference on 5 Amazon marketplaces)
EAN
0717206175127
Questions owners ask about this one
Should a PWM controller charge lithium?
It can, if the maker provides a lithium profile — which this one does. What PWM cannot do is convert surplus panel voltage into current, so the yield is lower than MPPT on a mismatched array. The chemistry support and the tracking type are separate questions.
What do charge statistics add?
A history rather than a reading. Seeing what a system produced over a fortnight tells you whether a panel is shaded, dirty or failing, which a live voltage cannot. It is the cheapest form of the monitoring a shunt would give.
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.
30 A charge · automatic 12 V/24 V identification · lead-acid only · USB output 5 V/2 A · industrial microcontroller with adjustable charge and discharge parameters · no display stated · short circuit, open circuit, reverse, overload · dual MOS reverse-current protection
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.
Best for: A tight enclosure where the controller has to fit a measured space and nobody will be reading a screen.
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.
