Introduction
The Maxima QB50-300W is a 300W DC solar surface pump delivering up to 2 m3/h flow and 30m
head, operating from a single 340W solar panel with a fully built-in controller.
General Description
The QB50-300W operates at 20–40 Vmp / 50 VOC with a maximum input current of 10A DC and a
maximum input power of 0.3 kW, recommended with 1 pc of 340W panel. It delivers a maximum
flow of 2 m3/h (33 L/min) at a maximum head of 30m. The controller is fully built-in — no external
unit required. The pump features a high-efficiency BLDC motor with MPPT and vector control,
MPPT efficiency max 99%, soft start, and a Rp 1″ × 1″ outlet. Motor speed 500–4000 RPM, max
water temp 40°C, insulation class F, IP54 rated. Pump unit weighs 3.6 kg. Copper impeller and cast
iron housing. CE and ISO 9001:2015 certified.
Single Panel Operation
Operates from 1 pc of 340W solar panel at 20–40
Vmp / 50 VOC — the lowest panel requirement in the range.
Built-in Controller
Fully integrated controller — no separate control unit,
wiring, or mounting required.
Compact and Lightweight
At 3.6 kg with built-in controller, it is the
lightest model in the Maxima surface pump range.





