QualificationExact sourced interface · assembled chain net-energy unqualified
ArticleBQ25570 · boost-mppt-harvester
Input window0.1–5.1 V · fractional-open-circuit tracking · solder-pads
Cold start0.6 V — below this the chain never begins, whatever the light
Quiescent draw0.488 µA — a source averaging less than this over 24 h nets negative
Output4.2 V · 0.1 A max · jst-ph
Body25 × 19 × 5 mm · 3.2 g
Checked againstamorton-am-1312c, amorton-am-1417c, amorton-am-1424c, amorton-am-1522c, amorton-am-1713c, amorton-am-1805c, adafruit-2750, adafruit-258, adafruit-2011
Geometry authority: declared-envelope
Datum: Board bottom face at z = 0; corner at origin; harvester input edge at y = 0.
Electrical figures are Texas Instruments’ for the BQ25570 silicon and are exact: cold-start voltage, tracking window, quiescent current and charge-current ceiling are properties of the die. The carrier board is a seller listing with no drawing, schematic or board file behind it — its 25 × 19 × 5 mm outline is the listing’s, and the 4.2 V charge voltage is the listing’s claim about a resistor divider it does not publish, not a verified value. The solid is that outline as a plain slab; connector bodies, inductor height and component clearance are unmodelled. Programmed MPPT ratio, board leakage and real indoor harvest efficiency are unverified.