Grape Solar STAR Series User Manual

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Connection Guide Rev. 170324
Grape Solar STAR Series
Connection Guide
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Series vs. Parallel Connections
Grape Solar STAR panels can be connected in parallel or series when used in conjunction with an
appropriately sized charge controller.
Connecting panels in series will result in a higher input voltage to a charge controller while a parallel
connection will result in a higher input current. Since an MPPT charge controller works as a transformer,
and increases the output current up as it reduces the voltage, the power fed to the battery will be the same
in both configurations.
It is a popular misconception that two panels in series are for charging a 24V battery bank and two panels
in parallel are for charging a 12V battery bank. In reality a 12V battery bank can be charged with an array
voltage of anything greater than 16V. That means a 1000V could charge a 12V battery as long as an
appropriate MPPT charge controller is used. But, in order to charge a 24V battery bank one would need
at least 32V.
Panels should always be connected in parallel for 12V charging with a PWM style charge controller.
Advantages of a series connection:
Since a series connection results in a higher voltage, that means that current is lower and there will be
less line losses. Less line losses means that smaller, less expensive wire can be used to connect the
panels to the charge controller on long runs. Also, money can be saved by not having to purchase MC4
comparable T Branch connectors.
Advantages of a parallel connection:
Many charge controllers have an input voltage limit of 25V. If the charge controller in your system has this
limitation a series connection would overload your charge controller. Parallel connections should always
be used with PWM style charge controllers.

Grape Solar STAR Series Specifications

General

Brand	Grape Solar
Model	STAR Series
Category	Solar panel
Language	English

Summary

Series vs. Parallel Connections

Advantages of Series Connection

Series connection offers lower line losses and reduced wire costs for longer runs.

Advantages of Parallel Connection

Parallel connection is necessary for PWM controllers and avoids overvoltage on low-voltage battery banks.

Connecting Panels in Series

Connecting Panels in Parallel

Mounting and Grounding

Panel Mounting Guidelines

Optimize energy production by pointing panels South at a tilt angle equal to current latitude.

Panel Grounding Requirements

Panels do not require positive grounding; grounding terminals are present but not required for operation.

Grape Solar Limited Warranty

Limited Product Warranty Terms

Covers defects in materials and workmanship for five years, offering repair, replacement, or refund.

Limited Power Warranty Terms

Guarantees 90% power output for 10 years and 80% for 25 years, addressing power degradation.

Warranty Exclusions and Limitations

Details conditions not covered, such as misuse, improper installation, or environmental damage.

Limitation of Warranty

States that express warranties exclude implied ones, and limits liability to the product's purchase price.

Obtaining Warranty Performance