Solbian SR (Merlin Cell) Range Purchase Guide

The SR Series utilise Merlin solar cells

The monocrystalline high efficiency SR cells are sandwiched by two patented metallic grids that serve as intracell and inter-cell interconnects. The same copper and solder as any other bus bar cell are used, but 20 redundant lines and 180+ interconnects, not only enable to extract more power but also dramatically improve the reliability, performance and ruggedness of the solar panels.  The grid on the front is carefully tailored to optimize the current harvesting, while the one behind the cell provides strong mechanical support. The grids essentially form a double shield that acts as a conducting reinforcement to the solar cell. Extreme crack and bend tolerance are built in, enabling novel crystalline silicon architectures. A guarantee of high efficiency and unmatched durability in flexible solar panels.

Learn more about the amazing Merlin Solar cells here:  https://www.merlinsolar.com/

 

Merlin solar cell technology in Solbian

 

 

 

 

 

Datasheet:  https://www.solbian.eu/img/cms/PDF/Datasheet%20SR.pdf

Installation Manual:  http://www.solbian.eu/img/cms/PDF/Solbian_installation_manual.pdf

Features of Solbian SR range

  • Highest tolerance to cracks and bending thanks to the double shield protecting the cell
  • Flexible and lightweight (2.2 kg/m2)
  • Completely waterproof and resistant to salt water
  • Thin (less than 2 mm)
  • 5 year warranty against manufacturing defects
  • Integrated bypass diodes to minimise output losses associated with partial shading
  • Available with different front sheets, many fixing and electrical wiring options (special order)
  • White, black or transparent back sheet (special order)
  • Junction box on top or underneath (special order)
  • 316 stainless steel eyelets (fitted by Solar 4 RVs)
  • Bi-adhesive backing covering the entire back surface of the panel (special order)
  • Charge 12V, 24V, 36V or 48V batteries, lead-acid or lithium, using a Genasun boost charge controller - refer https://www.solar4rvs.com.au/solar-charge-controllers/mppt-voltage-boost-solar-charge-controllers/
  • Designed and manufactured in Italy

 

  SR160L SR160Q SR144 SR108 SR72L SR72Q SR62
Maximum power [W] 160 160 144 108 72 72 62
Length Y [mm] 1523 1046 1364 1046 1364 728 1205
Width X [mm] 683 996 683 683 365 683 365
Thickness [mm] 2 2 2 2 2 2 2
Weight [kg] 2.4 2.4 2.1 1.7 1.2 1.2 1.1
Max power Voltage Vmp [V] * 18.6 18.6 16.7 12.6 8.4 8.4 7.2
Max power Current Imp [A] * 8.6
Open circuit voltage Voc [V] * 23 23 20.4 15.3 10.2 10.2 8.9
Columns x Rows (cells n°) 4x9 (36) 6x6 (36) 4x8 (32) 4x6 (24) 2x8 (16) 4x4 (16) 2x7 (14)
Short circuit current Isc [A] * 9
NOCT [°C] 45 ± 2 **
Operating temperature [°C]  -40 to +85°C
Temp. coeff. Pmax [%/°C] -0.38
Temp. coeff. Voc [%/°C] -0.27
Temp. coeff.  Isc [%/°C] 0.00
Maximum system voltage [V] 1000 V ***
Maximum reverse current [A] 12
Safety class A

* Values at STC = Standard Test Conditions: (a) light Spectrum for an Air Mass of 1.5; (b) irradiance of 1000 W/m2 with perpendicular incidence and (c) cell temperature of 25 °C. Measurements carried out according to the Standard IEC 61215 requirements.

* This NOCT is based on the STC and assume an air gap behind with 1m/s air flow.  In practice a panel directly bonded to an insulated substrate will be much hotter
** For best case safety,  only wire in series to raise the string voltage high enough for the charge controller, e.g 18V for a 12V battery, 36V for a 24V battery

Selecting the most appropriate Controller/Regulator

Solbian only uses whole cells.  This means that the voltage increases with the panel wattage, whereas the current is the same for all panels.  For example the SP52 has 16 cells in series giving just over 9V, whereas the SP104 has 36 cells in series giving just over 18V.  The amps for both panels is 5.7Amp.  

You will need a Genasun MPPT voltage boosting charge controller if you need to charge a battery that has a higher voltage than the panel, otherwise a Victron MPPT charge controller is recommended for boats where the panel Voltage (Vmp) is at least 50% above the battery nominal voltage*, ie, Vmp = 18V for a nominal 12V battery;   Vmp = 36V for a nominal 24V battery,  72V for a 48V battery (irrespective of the battery being lead-acid or lithium.   Otherwise a PWM charge controller is recommended where the Vmp is above the battery voltage but doesn't meet the required voltage for the MPPT to work.

*applies to most batteries but there are exceptions and we are happy to advise if unsure.

Panel Vmp Imp 12V 24V 36V 48V
SR62 7.2 8.6 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SR72L 8.4 8.6 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SR72Q 8.4 8.6 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SR108 12.6 8.6 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SR144 16.7 8.6 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SR160L 18.6 8.6 Victron MPPT 75/10 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SR160Q 18.6 8.6 Victron MPPT 75/10 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48

 

* Alternatively, to use a conventional Victron MPPT charge controller, panels can be wired into series which increases the voltage, e.g. four SR160 panels wired in series provides 144 cells in series giving 4x 18.6V = 74.4V which can be used for charging a 48V battery system.  The wattage is 4 x 160W = 640W.    At 48V, the theoretical maximum amps is 640W / 48V = 13.3A.  In real-life with a hot panel under a hot sun the efficiency is lower so the maximum amperage is up to 80% of the theoretical.    The smallest Victron MPPT charge controller for 48V is the SmartMPPT 100/20.   

Minimum number of cells in series that is required for a Victron MPPT charge controller

The following table lists the minimum number of cells in series that are required so that a conventional charge controller can be used and accommodate the voltage drop of the panel as temperature rises.  For safety, it is always recommended that DC voltage is kept as low as possible, i.e. a minimum number of panels are wired in series, i.e only wire enough panels in series just sufficient to provide the necessary Vmp required by the MPPT charge controller.   For example, Victron requires a Vmp of at least 4V above the battery voltage when the panel is hot.

  12V 24V 36V 48V
SunPower SP range 32 64 96 128
SR & SXp Range 36 72 108 144