Solbian SXp (Day4 cell) Range Purchase Guide

This guide provides information about Solbian's SXp range and what Solar Charge Controller to use for each panel.

The polycrystalline solar cells used in the SXp series are electrically connected using ultra-thin copper wires that form a very fine mesh on the cell surface, resulting in thousands of contact points. This alternative to the standard bus-bar method allows a higher module power and increases the energy yield. This technology is optimally suited to flexible modules, due to its intrinsic insensitivity to micro-fractures, that are the most common cause of energy loss in solar modules. Another advantage is a reduced sensitiveness to shading, a quite important issue in marine and mobility applications. The new connection technology, together with the use of high efficiency polycrystalline silicon cells, makes SXp panels especially powerful and reliable.

 

Datasheet:  https://www.solbian.eu/img/cms/PDF/SP_eng_06.pdf

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

Features of SXp range

  • High resistance to mechanical stresses thanks to the thin wires thick mesh on the cell surface
  • 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
  • White, black or transparent back sheet
  • Adaptable to any battery: from 12V to 48 volt, lead-acid or lithium using Genasun boost charge controllers
  • Designed and manufactured in Italy

As with all Solbian panels, only whole cells are used.  This means that the voltage increases with the panel wattage, whereas the current is the same for all panels.  For example the SXp60 has 17 cells in series giving just over 7V, whereas the SXp154 has 36 cells in series giving just over 18V.  The amps for both panels is 8.5Amp.  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.

Specifications for Solbian SXp Range

  SXp 154 L SXp 154 Q SXp 136 SXp 102 SXp 68 L SXp 68 Q SXp 60
Maximum power [W] 154 154 136 102 68 68 60
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] 2,40 2,40 2,10 1,70 1,20 1,20 1,10
Columns x Rows (cells n°) 4x9 (36) 6x6 (36) 4x8 (32) 4x6 (24) 2x8 (16) 4x4 (16) 2x7 (14)
Max power Voltage Vmp [V] 18,2 18,2 16,1 12,1 8,0 8,0 7,1
Open circuit voltage Voc [V] 23,0 23,0 20,4 15,3 10,2 10,2 8,9
Max power Current Imp [A] 8.5
Short circuit current Isc [A] 9.1
NOCT [°C] 45 ± 2
Operating temperature [°C] -40 to + 85
Temp. coeff. Pmax [%/°C] -0.38
Temp. coeff. Voc [%/°C] -0.27
Temp. coeff. Isc [%/°C] 0.05
Maximum system voltage [V] 1000 V
Maximum reverse current [A] 12A
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.

Recommended Controller for each Solbian SXp panel and battery voltage

Always contact Solar 4 RVs in case of doubt.
Nominal Battery voltage.  Genasun provides separate chargers for different chemistries, whereas the Victron chargers are suitable for both lead-acid and lithium.

SKU Vmp Imp 12V 24V 36V 48V
SXp 60 8.0 8.5 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SXp 68 L 8.0 8.5 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SXp 68 Q 8.0 8.5 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SXp 102 12.1 8.5 Genasun GVB-12 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SXp 136 16.1 8.5 Wire 2 in series & use Victron MPPT 100/20 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SXp 154 L 18.2 8.5 Victron MPPT 75/10 Genasun GVB-24 Genasun GVB-36 Genasun GVB-48
SXp 154 Q 18.2 8.5 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 SXp154 panels wired in series provides 128 cells in series giving 4x 18.2V = 72.8V which can be used for charging a 48V battery system.  The wattage is 4 x 154W = 616W.    At 48V, the theoretical maximum amps is 616W / 48V = 12.8A.  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