Photo Voltaic Power Generation System | Energy Manegement Applications - Relays, Solid State Devices -

Photovoltaic Power Generation System

Recommended products

HE-V

For cutoff of solar strings

LF-G

HE PV

HE-S

• For AC safety cutoff
• For operation in stand alone mode

AQZ

For electrical shock
prevention and bypass
(efficiency improvement)

For DC safety cutoff

[Junction box]

Inverter

Power
distributor

Load

Grid

Stand
alone

[Power conditioner]

Storage battery

AQ-A	EP	HE-V

• Battery charge/discharge switching • For DC safety cutoff • ★For inrush current prevention

Recommended products (AC side)

HE PV

HE-S ※

LF-G

Inverter

Power
distributor

Load

Grid

Stand alone

* When using HE-S relay.

*Use one 2a1b type
(creation of contact welding monitoring circuit is possible).

Recommended relay	● LF-G (1a 22 A, 33 A 250 V AC) Compact power relay with a 1.5 mm or 1.8 mm contact gap
	● HE-S (2a/2a1b 40 A 277 V AC) Two contacts compact power relay with 3.2 mm contact gap
	● HE PV (1a 35 A, 48 A, 90 A 277 V AC) Compact power relay with a 2.5 mm/3.0 mm contact gap, capable of switching from 35 A to 90 A

For Safety Cutoff on the AC side: Relays are used for safety cutoff on the grid (power network). The relay must cutoff the circuit to prevent abnormal currents that occur from affecting the commercial power supply.
Power relays are required as safety measures to protect the power supply system.

For operation in stand-alone mode: Relay contacts will be ON during a power outage and use of the stand-alone function is possible. The relays are used for stand-alone mode.

Recommended products (DC side)

For Solar strings
For Junction box connectors

Recommended relay	*HE-V (2a 20 A 1,000 V DC)** High-voltage cutoff relay capable of simultaneously cutting off the positive (+) and negative (-) terminals by serially connecting the 1 Form A contact. Up to 1,000V DC cutoff

* 1,000 V DC is the maximum allowable voltage when each 1 Form A contact is connected in series. The rating is 800 V DC.

● When something shades the solar panels or a defect occurs, the total power generation efficiency of the system decreases. In such cases, the total power generation efficiency can be maintained by bypassing low-efficiency panels or cutting off strings using relays.
● In case of a disaster, such as fire, system safety can be maintained by shorting each solar panel. (E.g. electrical shock prevention of firefighters)
● Remote control is possible for maintenance work, reducing maintenance costs.

Recommended relay	AQZ PhotoMOS (1a 10 A 60 V DC) PhotoMOS capable of frequent switching, improving system reliability

For Junction boxes and Power conditioners

● In case of a disaster, such as fire, system safety can be maintained by cutting off the DC line.
● Remote control is possible for maintenance work, reducing maintenance costs.
● Large current cuttoff possible during malfunction when connecting storage battery. (80 A type)

Recommended relay	*EP (1a 20 A, 80 A 1,000 V DC)** High-voltage cutoff relay with capsule contact construction, which provide high reliability

* 1,000 V DC is the maximum allowable voltage. The rating is 400 V DC.

Title	Language	File size	Update
エネルギーマネジメント向け商品のご提案	JP	5.1MB	November 1, 2024
Products for Energy Management	EN	3.9MB	October 17, 2024