Voltronic Power EnerSolar 3K PV User Manual

User Manual

EnerSolar 3K PV Inverter

Table Of Contents

1. Introduction ............................................................. 3

2. Important Safety Warning ......................................... 4

3. Unpacking & Overview .............................................. 6

4. Installation ............................................................... 6

5. Grid (AC) Connection ................................................ 8

6. PV Module (DC) Connection ...................................... 9

7. Commissioning ....................................................... 11

8. Operation ............................................................... 12

9. Maintenance & Cleaning .......................................... 17

10. Trouble Shooting .................................................... 18

11. Specifications ......................................................... 19

Distribution Box

Electric grids

PV module 2

EnerSolar PV inverter

PV module 1

1. Introduction

1-1. Overview

The EnerSolar inverter is designed to convert solar electric (photovoltaic or PV) power into
utility-grade electricity that can be sold to the local power company. This inverter is allowed for
2 arrays of PV modules. Embedded with two smart independent MPPTs, the EnerSolar PV
inverter can operate at optimum power output voltage.

Figure 1 Basic PV System Overview

This inverter is only compatible with PV module types of single crystalline and poly crystalline.
Do not connect any sources of energy other than these two types of PV modules to the
EnerSolar inverter. When designing the PV system, ensure that the values comply with the
permitted operating range of all components at all times. See Figure 1 for a simple diagram of
a typical PV system with EnerSolar Inverter.

1-2. Affecting Factors for Performance of the Inverter

There are a lot of factors to influence the performance of this inverter.

Rating for PV Modules

PV modules are rated at ideal factory conditions, such as specified illumination (1000 W/m2),
spectrum of the light and temperature (25 °C / 77 °F). This is called the STC (Standard Test
Condition) rating and is the figure that appears on the spec label of PV module. Generally
speaking, only around 60% to 70% of its peak STC-rated output will be produced from your
PV modules due to unpredicted environmental factors.

Temperature and Power Reduction

Environment temperature affects the power output of PV modules. Higher the temperature,
lower the power output of PV module. Comparing with pole-mounted PV module array,
roof-mounted PV module array generates less power due to less air circulation and excess
heat from roof top.

Conventions used:
WARNING! Warnings identify conditions or practices that could result in personal injury;
CAUTION! Caution identify conditions or practices that could result in damaged to the

unit or other equipment connected.

Important: The inverter will reduce its output generation to protect its electronic circuits
from overheating and any damage under high temperature environment. For maximum power
output in high temperature, it’s recommended to mount the inverter in a shaded location with
good ventilation.

Angle of the Sun

The angle of the sun in relation to the PV array surface—the array orientation can dramatically
affect the PV array output. The array energy output will vary depending on the time of day and
time of year as the sun’s angle in relation to the array changes. Sunlight output decreases as
the sun approaches the horizons (such as in winter in Europe) due to the greater atmospheric

air mass it must penetrate, reducing both the light intensity that strikes the array’s surface and

spectrum of the light. In general, you can expect only four to six hours of direct sunlight per
day depending on what part of Europe the inverter is installed.

Partial Shade

Shading on a single PV module of the array will reduce the output power of the entire system.
Such shading can be caused by something as simple as the shadow of a utility wire or tree

branch on part of the array’s surface. This condition, in effect, acts like a weak battery in a

flashlight, reducing the total output, even though the other batteries are good. However, the
output loss is not proportionate to shading even a tiny bit of shading will reduce the PV power
to the inverter. The inverter is designed to maximize its power production in all of the above
situations using its proprietary MPPT algorithm.

Other Factors

Other factors to reduce power generation of a solar system are:

 Dust or dirt on the modules
 Fog or smog
 Mismatched PV array modules, with slight inconsistencies in performance from one

module to another.

 Inverter efficiency
 Wire losses
 Utility grid voltage

2. Important Safety Warning

Before using the inverter, please read all instructions and cautionary markings on
the unit and this manual. Store the manual where it can be accessed easily.

This manual is for qualified personnel. The tasks described in this manual may be performed
by qualified personnel only.

General Precaution-

WARNING! Before installing and using this inverter, read all instructions and cautionary

markings on the inverter and all appropriate sections of this guide.

WARNING! Normally grounded conductors may be ungrounded and energized when a
ground fault is indicated.

WARNING! This inverter is heavy. It should be lifted by at least two persons.

CAUTION! Authorized service personnel should reduce the risk of electrical shock by

disconnecting both the AC and DC power from the inverter before attempting any
maintenance or cleaning or working on any circuits connected to the inverter. Turning off
controls will not reduce this risk. Internal capacitors can remain charged for 5 minutes after
disconnecting all sources of power.

CAUTION! Do not disassemble this inverter yourself. It contains no user-serviceable parts.
Attempt to service this inverter yourself may cause a risk of electrical shock or fire and will
void the warranty from the manufacturer.

CAUTION! To avoid a risk of fire and electric shock, make sure that existing wiring is in good
condition and that the wire is not undersized. Do not operate the Inverter with damaged or
substandard wiring.

CAUTION! Under high temperature environment, heat sink of this inverter could be hot
enough to cause skin burns if accidentally touched. Ensure that this inverter is away from
normal traffic areas.

CAUTION! Use only recommended accessories from installer . Otherwise, not-qualified tools
may cause a risk of fire, electric shock, or injury to persons.

CAUTION! To reduce risk of fire hazard, do not cover or obstruct the heat sink.

CAUTION! Do not operate the Inverter if it has received a sharp blow, been dropped, or

otherwise damaged in any way. If the Inverter is damaged, called for an RMA (Return Material
Authorization).

3. Unpacking & Overview

3-1. Packing List

Before installation, please inspect the unit. Be sure that nothing inside the package is
damaged. You should have received the following items inside of package:

Inverter unit PV connectors x 2 sets Mounting plate Software CD Manual

3-2. Product Overview

1) LCD display panel (Please check section 8 for detailed LCD operation)

2) Interface connection RS485 (Modbus card)

3) Connectors for solar modules

4) Grid connection

5) LED indicators

4. Installation

4-1. Selecting Mounting Location

Consider the following points before selecting where to install:

 Do not mount the inverter on flammable construction materials.
 Mount on a solid surface
 Although the unit is fitted with UV resistant components, direct exposure to sunlight

may cause a power reduction due to excessive heating.

 This inverter can make noises during operation which may be perceived as a nuisance in

a living area.

 Install this inverter at eye level in order to allow the LCD display to be read at all times.
 For proper air circulation to dissipate heat, allow a clearance of approx. 20 cm to the

WARNING!! Remember that this inverter is heavy! Please be carefully when lifting out
from the package.

side and approx. 50 cm above and below the unit.

1. Employ the mounting plate as a

template for marking the positions of
the boreholes

2. Mount the mounting plate with

appropriate screws (M5,SUS304) into
four holes to fix the plate in place

3. Follow the below figure to place the

solar inverter onto the mounting
plate.

4. Check if the solar inverter is firmly

secured.

 Dusty conditions on the unit may impair the performance of this inverter.
 The ambient temperature should be between -25°C and 60°C to ensure optimal

operation.

 The recommended installation position is to be adhered to (vertical).
 Unused DC connectors and interfaces must be sealed with sealing plugs to ensure

protection class IP65 for the whole system (inverter & cables).

 This inverter is designed with IP65 for outdoor applications with high humidity.

4-2. Mounting Unit with Wall Mounting Bracket

Please utilize the delivered mounting plate for problem-free installation of the solar inverter.
Installation to the wall should be implemented with the proper screws. Mount the wall bracket
so that the solar inverter can be easily attached to the wall. After that, the device should be
bolted on securely.