Board-dat/OPM/OPM1178-dat/OPM1178-dat.md
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# OPM1178 dat
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+- [[ACDC-dat]] - [[OPM1110-dat]] - [[OPM1111-dat]] - [[OPM1178-dat]]
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[mini-ac-dc-isolated-power-module-5vout-700ma-3-5w](https://www.electrodragon.com/product/mini-ac-dc-isolated-power-module-5vout-700ma-3-5w/)
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power-dat/ACDC-dat/ACDC-dat.md
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- [[transformer-dat]]
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-- [[power-protection-dat]]
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-
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-
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-
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+- [[protection-power-dat]]
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## Modules
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- [[OPM1068-dat]]
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+- [[OPM1178-dat]]
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## output
power-dat/solar-dat/solar-power-dat/solar-panel-wiring-dat/solar-panel-wiring-dat.md
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- [[cable-dat]]
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+## solar panel parallel wiring
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+**Solar panels can also be connected in parallel.**
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+If the primary goal of a series connection is to **"boost voltage,"** the main purpose of a parallel connection is to **"increase current" (which in turn increases total power).**
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+Thinking of each solar panel as an individual battery, connecting them in parallel changes their electrical characteristics as follows:
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+---
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+### 1. Electrical Rules of Parallel Connection
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+* **Current (A) Adds Up:** The total current is the sum of the currents of all individual panels.
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+* **Voltage (V) Stays the Same:** The total voltage remains equal to the voltage of a single panel (assuming all panels have identical specifications).
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+
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+> **Formulas:**
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+> V_total = V1 = V2 = ... = Vn
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+> I_total = I1 + I2 + ... + In
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+
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+For example, if you have **two 18V 5A solar panels**:
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+* **In Parallel:** The voltage remains **18V**, but the total current becomes **10A**. The total power is still 18V * 10A = 180W.
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+* **Wiring Method:** Connect all the **positive (+)** terminals together, and connect all the **negative (-)** terminals together. Finally, run one main positive wire and one main negative wire to your controller. This is typically done using Y-branch MC4 connectors.
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+
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+---
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+
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+### 2. Key Advantages of Parallel Connection
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+* **Excellent Shade Tolerance:** This is the biggest advantage of a parallel setup! In a series connection, if one panel is shaded, it bottlenecks the entire string. In a parallel setup, however, **each panel operates independently**. If one panel gets covered by tree branches or debris, its output will drop, but the other panels will continue producing full power without being affected.
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+* **Safer, Low-Voltage System:** Parallel connections keep the system voltage low. For DIYers, RVs, or camping setups (which often use 12V or 24V battery banks), maintaining a low voltage (around 18V to 22V) is highly safe to handle and minimizes the risk of dangerous high-voltage DC arcing.
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+
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+---
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+
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+### 3. ⚠️ Critical Pitfalls to Avoid
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+While parallel connections are highly resilient to shade, they place heavier demands on your wiring and equipment:
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+* **Thicker Wires Required (Higher Line Loss):** Because a parallel setup multiplies the current, line loss increases significantly. Higher current generates more heat in the wires. To prevent losing valuable energy as heat, parallel systems require **much thicker cables**, and the distance between the solar panels and the controller should be kept as short as possible.
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+* **Voltages Must Match:** The solar panels connected in parallel **must have identical or nearly identical voltages**. If you parallel an 18V panel with a 36V panel, the higher-voltage panel will back-feed current into the lower-voltage panel, severely tanking efficiency and potentially damaging the lower-voltage panel.
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+* **Controller Current Limits:** When choosing a charge controller (PWM or MPPT), you must check its **"Max Rated Charge Current"** rather than just its voltage limits. If your parallel panels output a total of 30A, you need a controller rated for at least 30A (ideally 40A to leave a safety margin); otherwise, it will trigger overload protection or burn out.
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+* **Fuses are Recommended for 3+ Panels:** If you are connecting 3 or more panels in parallel, a short circuit in one panel can cause the current from all the other panels to rush into the damaged one. To prevent fire hazards, it is highly recommended to install an inline fuse or a blocking diode on the positive line of each individual panel.
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## solar panel series wiring
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