4. Characteristics of Modules
5. Operation and Maintenance
6. Disclaimer of liability
ET Solar module users should rinse the array seasonally or as needed in dry, dirty areas to
improve the performance of their solar electrical systems. Heavily soiled modules will have
a decrease in performance due to reduced light on the photovoltaic cells. Studies by the
PVUSA in Davis, CA estimate that during a dry year module soiling may affect
performance by as much as 7% annually with no cleaning. Seasonal rains often clean the
modules.However, during the long dry summer, it is helpful to rinse the modules as
needed.
ET solar modules may be rinsed with clean water to remove dirt. Normal pressure from a
standard residential hose and nozzle is recommended. Early morning and late afternoons
are favorable times to clean to avoid a sudden change in temperature. Care must be
taken since modules produce energy any time light is present. Modules are not to be
touched or walked on except by a licensed professional.
Because the use of this manual and the conditions or methods of installation, operation,
use and maintenance of photovoltaic products are beyond ET Solar's control, ET Solar
does not accept responsibility and expressly disclaims liability for loss, damage, or
expense arising out of or in any way connected with such installation, operation, use or
maintenance. No responsibility is assumed by ET Solar for any infringement of patents or
other rights of third parties, which may result from use of the PV product. No license is
granted by implication or otherwise under any patent or patent rights.
The information in this manual is based on ET Solar's knowledge and experience and is
believed to be reliable, but such information including product specification (without
limitations) and suggestions does not constitute a warranty, expressed or implied. ET Solar
reserves the right to change the manual, the product, the specifications, or product
information sheets without prior notice.
The array consists of modules in series and parallel and has a similar electrical curve to
that of a single module. In order to output maximum electrical power to the load, try to
make the impedance of the load match the electric performance of the module or
array. In order to maintain the stability of the system, also pay attention to the changes in
the electric curve of modules, especially under weak light. In more complex control
circuits, the controller supplier may have already adopted microprocessors for the
tracking of maximum power output. For the best impedance matching and the best
tracking of maximum power output, please refer to other relevant documents regarding
these issues.
Electrical ratings of ET Solar modules are shown in Appendix 1. For the detailed
specifications, please refer to the module datasheet.
Usually the load of the modules is a group of batteries. To prevent the modules from
being charged by batteries under the circumstance of no sunlight, it is important to add
a shut-off diode in series. Also, please consider the voltage decrease of PN junction of
about 0.7V when connecting the shut-off diode. The modules can withstand for a
maximum positive or negative design loading of 45 lbs / ft².
The environmental temperature may also affect the modules’ output power. If the
environmental temperature goes up, the short-circuit current will increase a little, while
open-circuit voltage will decrease, which will result in a decrease in the module’ s output
power. Therefore, a lower environmental temperature is most appropriate for the module.
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Subject to technical modifications without notice. 2016 © ET Solar Group
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Subject to technical modifications without notice. 2016 © ET Solar Group
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WARNING!
The product is designed as a plain plate type that should not be irradiated directly
under concentrated light.
