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ZNShine, bifacial solar panel (high-voltage strings)

ZNShine 440 W Bifacial Solar Panel

Also written as ZXM7-UHLDD108, ZnShine 440W

A 440 W, 22.53% efficient bifacial glass-glass panel that also makes power from light reflected onto its back.

Not yet available

Best for

A ground-mount array for a cabin or farm, wired in long series strings into a 48 V all-in-one inverter.

Photo pending: we only show images we own or are licensed to use.

Strengths and limitations

Strengths

  • 440 W; 22.53% efficiency (Signature Solar).
  • Voc 38.80 V, Isc 14.39 A; Voc temperature coefficient -0.25%/C (ZNShine data via The Solar Store).
  • Glass on both faces; front load up to 5,400 Pa, rear 2,400 Pa (Signature Solar).
  • 12-year product warranty, 30-year output guarantee (Signature Solar).

Limitations

  • 54 lb and 67.7 x 44.6 in: a two-person lift.
  • Our string math for an EG4 6000XP: at -20 C each panel reaches about 43.2 V open-circuit, so 11 in series stays under 480 V; 9 panels (3,960 W) fill one 4,000 W input. Check against your own coldest temperature.

What it does not do

  • Work on a 12 V RV system: at 38.8 V open-circuit per panel it is built for high-voltage strings.
  • Ship one at a time from this seller: Signature Solar sets a 10-panel minimum.
  • Guarantee a bifacial gain: the back side depends on the ground under it, panel height and spacing.

Specifications

From the cited source on 2026-11-10. "Not verified" means no source we checked published it.

Power at STC 440 W [1]
Open-circuit voltage (Voc) 38.80 V [1]
Short-circuit current (Isc) 14.39 A [1]
Max power voltage / current 32.30 V / 13.63 A [2]
Voc temperature coefficient -0.25%/C [2]
Efficiency 22.53% [1]
Bifacial factor 80% +/- 10% [2]
Max system voltage 1,500 V DC [2]
Size 67.7 x 44.6 x 1.18 in (1722 x 1134 x 30 mm) [1]
Weight 54 lb [1]
Load rating Front 5,400 Pa; rear 2,400 Pa [1]
Warranty 12-year product; 30-year output [1]
Certifications Not verified

Power and travel notes

Real runtime is less than capacity divided by load: conversion losses, battery reserve and temperature all cut into it. Size a battery for your fridge.

Before you buy

  • Panel voltage rises in the cold. Size each string so its open-circuit voltage on your coldest morning stays under the inverter's maximum.

Sources

  1. ZnShine 440W Bifacial Solar Panel, Signature Solar (retailer), read 2026-11-10. Part ZXM7-UHLDD108; 440 W; Voc 38.80 V; Isc 14.39 A; 22.53% efficiency; 54 lb; 67.7 x 44.6 x 1.18 in; monocrystalline, bifacial, black; front load up to 5,400 Pa, rear 2,400 Pa; minimum purchase 10; 12-year product warranty and 30-year output guarantee (pallet page). Price shown, not printed on our site.
  2. ZnShine ZXM7-UHLDD108-440 specifications, The Solar Store (retailer copy of the ZNShine data sheet) (retailer), read 2026-11-10. Vmp 32.30 V; Imp 13.63 A; Voc 38.80 V; Isc 14.39 A; Voc temperature coefficient -0.25%/C; bifacial factor 80 +/- 10%; max system voltage 1,500 V DC; -40 to 85 C; 1722 x 1134 x 30 mm; 2.0 mm + 2.0 mm heat-strengthened glass; IP68 junction box.
  3. EG4 6000XP user manual, EG4 Electronics (manual copy) (manufacturer), read 2026-11-10. Can run in off-grid only mode. Purely off-grid systems should strongly consider a 2-wire start backup generator for extended cloudy periods (8 to 12 kW diesel recommended, 8 kW minimum per inverter). Two MPPT inputs, 480 V max, optimal 120 to 385 VDC.
  4. EG4 6000XP specification sheet, ver. 1.2.1, EG4 Electronics (sheet hosted by SanTan Solar) (manufacturer), read 2026-11-10. Maximum utilized solar power 8,000 W (4,000 W per MPPT), recommended maximum solar input 10,000 W; MPPT efficiency 99%; battery charging and discharging efficiency 93%; idle consumption under 30 W with PV, about 50 W on battery; max charge 125 A, max discharge 140 A; 48 VDC; 5-year standard warranty.

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