16 (sixteen)
Rectifier / Blocking Diodes
Each: 6Amp 1000v (1Kv) ( see more spec. below)
BLOCKING DIODES
Diodes placed in series with cells or modules can perform another function that of blocking reverses leakage current backwards through the modules. There are two situations where blocking diodes can help prevent the phenomenon.
• Blocking reverse flow of current from the battery through the module at night.
In battery charging systems, the module potential drops to zero at night, and the battery could discharge all night backwards through the module. This would not be harmful to the module, but would result in loss of precious energy from the battery bank. Diodes placed in the circuit between the module and the battery can block any nighttime leakage flow.
• Blocking reverse flow down damaged modules from parallel modules during the day.
Blocking diodes placed at the head of separate series wired strings in high voltage systems can perform yet another function during daylight conditions. If one string be comes severely shaded, or if there is a short circuit in one of the modules, the blocking diode prevents the other strings from loosing current backwards down the shaded or damaged string. The shaded or damaged string is “isolated” from the others, and more current is sent on to the load. In this configuration, the blocking diodes are sometimes called “isolation diodes”.
Axial Lead Silicon Rectifier Diodes
Maximum Repetitive Peak Reverse Voltage: 1000V
Maximum RMS Voltage: 700V
Maximum DC Blocking Voltage: 1000V
Maximum Average Forward Rectified Current (60Hz, resistive or inductive load. Derate current by 20% for capacitive load): 6A
Peak Forward Surge Current (8.3ms single half sine-wave superimposed on rated load-JEDEC Method): 400A
Operating Junction and Storage Temperature Range: -55° to +125°C
Maximum Forward Voltage (IF=6A): 0.95V
Maximum DC Reverse Current at Rated DC Blocking Voltage (TA=25°): 5uA
Maximum DC Reverse Current at Rated DC Blocking Voltage (TA=100°C): 400uA
Typical Junction Capacitance (VR=4V, f=1MHz): 100pF
Maximum Thermal Resistance Junction to Ambient: 10°C/W
Function
- What exactly is a blocking diode? It is a device that is used to prevent reverse electrical currents from flowing back from a specified battery bank through solar panels. A blocking diode is generally necessary only when someone is not using a charge controller.
- A blocking diode is also used for taking preventative measures. A blocking diode works to protect photovoltaic modules from voltage spikes that are created by permanent magnet producing devices like ones that are used in both hydro and wind generators. It is also necessary for every photovoltaic module to stop nighttime power draw via the modules.
Any solar energy systems with numerous panels should should consist of blocking diodes in order to protect the panels from other panels during times of panel breakdown, ground fault issues, shading, and also for isolating them away from batteries during the night.
Benefits
Why exactly is a blocking diode important? In essence, a blocking diode performs three major operations. It keeps batteries from alternating solar panels. It is used for preventing the ability of batteries to charge power grids, and it also prevent batteries from charging wind generating devices.
Warning
If you do not properly and efficiently install a blocking diode into your renewable energy system (whether that renewable energy system is solar, water or wind), your batteries will never work efficiently. Because of this, it is important to make sure that you properly and correctly install your blocking diode. Also, a blocking diode does not protect against over currents. To protect against over currents, fuses or breakers should be installed.
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