Systems and methods to reduce field buildup between cells and glass and frame assembly for solar energy production
Systems and methods for removing charge buildup/leakage from solar modules. A discharge controller may be coupled between a solar module and a string bus of a solar array. The discharge controller is configured to disconnect the solar module from the string bus, and to connect a grounded frame to solar cells of the solar module. Since the grounded frame of the solar module is grounded, connecting the grounded frame and the solar cells allows charge buildup/leakage to discharge into ground.
1. A solar module, comprising:
a frame pole for connecting to ground;
a positive pole;
a negative pole; and
a plurality of solar cells disposed within the frame and connected between the positive pole and the negative pole;
the solar module having:
a first mode to remove an electric field buildup on the solar module, and
a second mode to provide electricity produced by the solar cells onto a string bus;
wherein in the first mode:
the solar cells disconnected from the string bus;
the positive pole and the negative pole connected to the frame of the solar module; and
the solar cells connected to the ground;
wherein in the second mode:
the positive pole and the negative pole disconnected from the frame of the solar module;
the solar cells disconnected from the ground; and
the solar cells connected to the string bus.
2. The solar module of claim 1 , wherein a ratio of time period between the first mode and the second mode is such that loss of power generated by the solar cells due to the first mode is less than loss of power due to the electric field buildup during the second mode.
3. The solar module of claim 1 , wherein the electric field buildup includes charges leaked into the solar cells.
4. The solar module of claim 1 , wherein the electric field buildup includes charges in dust deposited on a transparent cover over the solar cells.
5. A solar generation unit, comprising:
a solar module, comprising:
a frame;
a positive pole;
a negative pole; and
a plurality of solar cells; and
a discharge controller coupled between the solar cells and a string bus;
wherein during production of electricity by the solar module, the discharge controller is configured to alternate between:
a first mode to remove an electric field buildup on the solar module, and
a second mode to provide electricity produced by the solar cells onto the string bus;
wherein in the first mode, the discharge controller is configured to:
disconnect the solar cells from the string bus;
connect the positive pole and the negative pole to the frame of the solar module; and
connect the solar cells to the ground;
wherein in the second mode, the discharge controller is configured to:
disconnect the positive pole and the negative pole from the frame of the solar module;
disconnect the solar cells from the ground; and
connect the solar cells to the string bus.
6. The solar generation unit of claim 5 , wherein in the first mode, the discharge controller is further configured to provide a path bypassing the solar module in the string bus.
7. The solar generation unit of claim 6 , wherein in the first mode, the discharge controller is further configured to apply a voltage potential between the frame and the solar cells.
8. The solar generation unit of claim 5 , wherein a ratio of time period between the first mode and the second mode is such that loss of power generated by the solar cells due to the first mode is less than loss of power due to the electric field buildup during the second mode.
9. The solar generation unit of claim 5 , wherein the electric field buildup includes charges leaked into the solar cells.
10. The solar generation unit of claim 5 , wherein the electric field buildup includes charges in dust deposited on a transparent cover over the solar cells.
11. The solar module of claim 1 , wherein in the first mode, the positive pole and the negative pole disconnected from the string bus, and the frame pole connected to the ground.
12. The solar module of claim 1 , wherein in the second mode, the frame pole disconnected from the ground.