Victron Energy SPM043052002 Solar Panel 305W-20V Mono 1658x1002x35mm Series 4B

Victron Energy BlueSolar 305W 20V Mono High-Efficiency Monocrystalline Solar with a 25-Year Power Warranty.

Product Overview

The Victron Energy BlueSolar SPM043052002 is a 305-watt, 20V nominal monocrystalline solar panel from the Series 4B range, designed for battery charging across vehicles, boats, motorhomes, caravans, and fixed off-grid installations. Monocrystalline cell construction delivers higher conversion efficiency in a more compact footprint than polycrystalline equivalents at similar wattages at 1658 x 1002 x 35mm, the SPM043052002 is physically smaller than the 330W BlueSolar poly panel, making it the better choice for installations where roof or deck space is limited and maximising watts per square metre is the priority.

The low voltage-temperature coefficient maintains output as panel temperatures rise a meaningful advantage on Australian rooftops where summer operating temperatures routinely reach 60–70°C. Broad-spectrum cell sensitivity and exceptional low-light performance extend daily generation into the low-irradiance periods of morning, late afternoon, and overcast conditions that account for a significant portion of actual energy yield in real-world installations. Factory-fitted MC4 (PV-ST01) connectors, a sealed waterproof junction box, high-performance bypass diodes, and an anodised aluminium frame make this panel installation-ready and compatible with the full range of standard mounting hardware and MC4 solar wiring accessories. A 25-year limited power output warranty and 5-year materials and workmanship warranty support the long-term investment.

Key Specifications

• Part Number: SPM043052002
• Series: BlueSolar Monocrystalline Series 4B
• Rated Power: 305W
• Nominal Voltage: 20V
• Cell Type: Monocrystalline silicon
• Dimensions: 1658 x 1002 x 35mm (L x W x D)
• Frame: Anodised aluminium
• Glass: High-transmission tempered glass
• Encapsulation: Advanced EVA (Ethylene Vinyl Acetate) with triple-layer back sheet
• Junction Box: Sealed, waterproof, multi-functional
• Bypass Diodes: High performance — minimise shading losses
• Connectors: MC4 (PV-ST01) — pre-wired, quick-connect
• Power Output Warranty: 25-year limited
• Materials & Workmanship Warranty: 5-year limited

Features & Benefits

• Monocrystalline Cell Construction — Higher Efficiency, Smaller Footprint — Monocrystalline panels use single-crystal silicon cells, achieving higher energy conversion efficiency than polycrystalline cells at the same panel area. At 1658 x 1002 x 35mm, the SPM043052002 is more compact than comparable-wattage poly panels — the better choice when roof space, deck area, or weight constraints limit how many panels can be installed, and efficiency per square metre matters.
• 305W Output at 20V Nominal — Delivers 305 watts at 20V nominal, suitable for MPPT charge controllers in 12V or 24V battery systems. As panel output voltage exceeds 30V in open-circuit conditions, an MPPT controller is required rather than a basic PWM type to correctly step down the panel voltage for battery charging — confirm your controller's maximum input voltage against this panel's Voc from the datasheet before connecting.
• Low Voltage-Temperature Coefficient — Panel output voltage and power drop as cell temperature rises. The low temperature coefficient of the SPM043052002 minimises this loss — more power is retained on hot days when roof-mounted panels are operating at elevated temperatures. In Australian climates, where summer roof temperatures can push panel operating temperature well above the STC test condition of 25°C, a low temperature coefficient has a direct impact on actual daily energy yield.
• Exceptional Low-Light Performance — Monocrystalline cells in the Series 4B range maintain high sensitivity across the solar spectrum, generating usable output in diffuse light, overcast conditions, morning fog, and low sun angles. This extends the daily generation window and improves system performance on cloudy days — a practical yield advantage over panels with weaker low-irradiance response.
• 25-Year Limited Power Output Warranty — Victron backs the SPM043052002 with a 25-year limited warranty on power output, guaranteeing output above a defined percentage of rated power over the panel's service life. The 5-year warranty covers materials and workmanship separately — including frame, glass, junction box, and connectors. Confirm specific degradation floors and claim conditions in Victron's warranty documentation.
• High-Performance Bypass Diodes — Allows current to route around shaded or degraded cells rather than being forced through them. In real-world installations — caravans with roof vents, rooftops with chimneys, boat masts casting shadows — partial shading is unavoidable. Bypass diodes limit the disproportionate power loss that shading causes in an unprotected string.
• Advanced EVA Encapsulation with Triple-Layer Back Sheet — Bonds and protects the monocrystalline cells against moisture ingress, UV degradation, and thermal stress across a 25-year service life. The triple-layer back sheet meets high-voltage safety requirements relevant when panels are connected in series or operating at elevated voltages in larger arrays.
• Sealed Waterproof Junction Box — Houses the bypass diode assembly and cable exits in a permanently sealed enclosure. Junction box failure is among the most common causes of panel degradation in outdoor installations — the sealed design protects the electrical connections from moisture, insects, and contaminants across the panel's service life.
• High-Transmission Tempered Glass — Maximises light transmission to the cells while providing impact resistance against hail and mechanical loads. Tempered construction adds stiffness, reducing flex stress on cells and the encapsulation layer during handling, transport, and roof mounting.
• Anodised Aluminium Frame — Provides mechanical strength for standard roof rail and clamp mounting systems while resisting corrosion in coastal, marine, and tropical environments common across Australian installation sites.
• Pre-Wired MC4 (PV-ST01) Connectors — Factory-fitted MC4 connectors allow direct, tool-free connection to MC4 solar cables, Y-splitters, and charge controller inputs. Compatible with the full Victron solar wiring accessory range and standard third-party MC4 components.

Technical Specs