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Teardown
Amara Okonkwo
@amara-builds
Bought at retail · surveyed Jul 29, 2026
- Independent dimensional survey
- Empirical teardown analysis
- Material spectroscopy & alloy analysis
What can I quote from, and what is still missing?
- Parts cost
- $45 – $60
- Parts
- 148
- Fabrication files
- STEP · DXF · Gerber · Drill · Pick and place · BOM CSV
- Difficulty
- Advanced
The full control board from a 400 L off-grid chest freezer: MPPT stage, compressor driver, and why the thermistor placement costs it four percent of its duty cycle.
218 comments
3,104 likes
1,147 savesWhat you may do with this
No licence and no authorization. The survey is the publisher's own measurement of hardware they bought, and any patent or trade-dress question in your manufacturing jurisdiction is still yours to answer.
What the methods prove
Independent dimensional survey
Dimensions measured off the unit, then redrawn from those measurements.
Empirical teardown analysis
The unit disassembled and recorded part by part.
Material spectroscopy & alloy analysis
Materials identified by compositional analysis of the unit's own parts.
Two units bought; the second was left assembled as a reference.
Everything published here is the publisher’s own measurement of a legally acquired, off-the-shelf commercial unit. Qatoto does not host manufacturer-internal documents and makes no clearance assessment of its own.
Report an IP concern about this teardown
Publisher attested on Aug 14, 2026 that the unit was lawfully obtained, that the data was gathered by measurement and standard disassembly, and that no vendor-confidential material was used.
Materials and composition
Every designation below carries how the publisher arrived at it. A material named from a datasheet or a supplier is not the same claim as one measured off this unit.
ABS, UL94 V-0
Enclosure base and lid · Polymer
Read off the part's own marking
Injection moulded · Moulded texture, no secondary finish
6063-T5
Heatsink extrusion · Metal alloy
Measured by spectroscopy
CNC milled · Clear anodised
Composition, 4 elements
Element Weight percent Method Instrument Al 97.5–99.35 % Synthetic exampleInvented figure. Nobody ran this scan. Not an instrument reading Mg 0.45–0.9 % Synthetic example Not an instrument reading
Simulation
- Factor of safety
- 3.1 ×
- Peak von Mises
- 24 MPa
- Max displacement
- 310 µm
- Thermal delta
- 38 K
- Rated load
- 50 N
Author-reported figures from their own analysis or test rig. Nothing on this page computed them.
Walkthrough
Documents
Controller schematic, sheets 1-3
Schematic · 1.4 KB · 3 pages
Bill of materials, 48 line items
Bill of materials · 1.1 KB · 2 pages
Manufacturing files
What a machine shop or a board house builds from.
Mechanical
Enclosure, lid and base
STEP · 308 B
Lid gasket cut path
DXF · 132 B
Electronics
Top copper
Gerber · 130 B
Plated through-holes
Drill · 96 B
Getting it made
Qatoto lists factories by capability and certification and carries an inquiry to them. Nothing here is a quote, and a factory will ask for your own files.
Browse the factory directory- cold-chain
- solar
- power-electronics
- mppt
Discussion
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