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dc contactor
Energy Storage System Solutions
In response to the application conditions and industry pain points of energy storage systems, 
Anlaiqiang Technology has developed a series of highly reliable DC contactors. These DC contactors 
can fully meet the reliable operation requirements of large-scale energy storage (generation side, grid 
side), medium-sized energy storage (industrial and commercial use), and small-sized energy storage 
(residential use).
Selection Guide for DC Contactors in Energy Storage Systems
■    Characteristics of the Following DC Contactors
✔     Low temperature rise, long service life, high reliability, and easy installation.
✔     The load voltage is up to 1500Vdc.
Image Part Number Rated Current (A) Max. Switching Voltage (V DC) Coil Voltage Rating Options (V DC) Power Contact Arrangement Auxiliary Contact Arrangement Options Coil Characteristic Load Termination Mounting Type Options Certificates
EVQ1D-10 1000V dc / 10A DC Contactor EVQ1D-10 10 1000 12 / 24 / 48 SPST-NO-DM None Single coil, Quick-connect Internal thread (M4) Bottom CE, TÜV
EVQ1D-30 1000V dc / 30A DC Contactor EVQ1D-30 30 1000 12 / 24 / 48 SPST-NO-DM None Single coil, Quick-connect Internal thread (M4) Bottom CE, TÜV
EVQ1D-50 1000V dc / 50A DC Contactor EVQ1D-50 50 1000 12 / 24 / 48 SPST-NO-DM None Single coil, Quick-connect Internal thread (M4) Bottom CE, TÜV
EVQ2H-100 1000V DC / 100A DC Contactor EVQ2H-100 100 1500 12 / 24 / 48 SPST-NO-DM SPST-NO / SPST-NC / None Single coil, Leads Internal thread (M5) Bottom / Side
EVQ2H-135 1000V DC / 135A DC Contactor EVQ2H-135 135 1500 12 / 24 / 48 SPST-NO-DM SPST-NO / SPST-NC / None Single coil, Leads Internal thread (M5) Bottom / Side
EVQ15-400 1500V dc / 400A DC Contactor EVQ15-400 400 1500 12 / 24 SPST-NO-DM SPST-NO / SPST-NC / None Dual coil, Leads External thread (M10) Bottom CCC, UL, CE
EVQ15-500 1500V dc / 500A DC Contactor EVQ15-500 500 1500 12 / 24 SPST-NO-DM SPST-NO / SPST-NC / None Dual coil, Leads External thread (M10) Bottom CCC, UL, CE
EVQ15-600 1500V dc / 600A DC Contactor EVQ15-600 600 1500 12 / 24 SPST-NO-DM SPST-NO / SPST-NC / None Dual coil, Leads External thread (M10) Bottom CCC, UL, CE
Residential Energy Storage
■    Application Cases
dc contactor
contactor
dc contactor
relay
dc contactor
relay
dc contactor
■    Typical Control Circuit Schematic Diagram of Residential Energy Storage System
dc contactor
dc contactor
■    Introduction to Residential Energy Storage Systems
Household energy storage systems are installed in residential settings to store electrical 
energy for on-demand use, with the core functions of "energy storage" and 
"self-consumption".
Essentially, a household energy storage system is a "private power bank" for homes, 
primarily addressing issues related to flexibility and cost-effectiveness in household 
electricity usage.
I. Core Components of Household Energy Storage
A household energy storage system is not a single device but an integrated unit where
multiple key components work together. It mainly consists of three parts:
1. Energy Storage Battery: 
The core component for energy storage, equivalent to the "battery itself". Currently, lithium iron phosphate batteries, which offer higher safety, are the mainstream choice.
2. Inverter:
Responsible for energy conversion. It can convert direct current (DC) generated 
by solar panels and stored in batteries into alternating current (AC) usable by 
household appliances.
3. Control and Protection System:
The intelligent management core. It monitors electricity usage status, controls 
charging and discharging timings, and provides protection against overcharging, 
over-discharging, short circuits, and other hazards.
II. Main Functions and Roles of Household Energy Storage
The value of household energy storage is reflected in three aspects, meeting the needs 
of different households:
1. Synergy with PV for Self-Consumption:
If a home has solar panels installed, the electricity generated during the day can be prioritized for storage to avoid wasting excess energy. The stored energy is then used at night, maximizing the utilization of clean energy.
2. Backup Power for Power Outages:
Acting as an emergency power source, it automatically switches to supply electricity 
when the grid fails, ensuring basic power for critical devices such as refrigerators, lighting, and routers.
3. Reduction of Electricity Bills:
In regions with time-of-use electricity pricing, the system can charge during "off-peak" hours when electricity prices are low and discharge for use during "peak" hours when prices are high, lowering electricity costs through price differences.
Ⅲ. Core Functions of DC Contactors in Residential Energy Storage Systems
The functions of DC contactors revolve around "control" and "protection", mainly 
reflected in three aspects:
1. Circuit On-off Control:
Acting as the core switch, it is responsible for connecting or disconnecting the DC circuit between the battery and the inverter. When the system needs to charge or discharge, the contactor closes to conduct the circuit; when the system shuts down or malfunctions, it opens to cut off the circuit.
2. Overload and Short-Circuit Protection:
When an overcurrent (such as overload) or short-circuit fault occurs in the circuit, the DC contactor can disconnect quickly. This prevents expensive core components like batteries and inverters from being damaged by excessive current, serving as a dual protection beyond the "fuse".
3. Safety Isolation:
During system maintenance, overhaul, or long-term shutdown, the DC contactor can achieve physical isolation of the circuit after disconnection. This prevents personnel from contacting high-voltage DC electricity during operation, ensuring personal safety.
Large-scale Energy Storage (Generation-side, Grid-side)
■    Application Cases
dc contactor
dc contactor
dc contactor
contactor
dc contactor
contactor
dc contactor
■    Schematic Diagram of a Typical Control Circuit for a Large-Scale Energy Storage System
contactor
✔
 
 
 
✔
✔
The left diagram shows a typical control circuit for large-scale 
energy storage. This is a simplified schematic diagram, which 
only presents part of the control logic of the DC contactor and 
is for reference only.
K1 is the main circuit DC contactor.
K2 is the pre-charging DC contactor.
ALQ Technology was founded in
2013 and is committed to providing safer and more reliable DC switchgear for the global market. We have a strong R&D team that closely focuses on customers' needs and pain points, delivering
targeted DC contactors / DC relays to them. Endowed with rapid 
response capabilities, we 
continuously create greater value for our customers.

QUICK LINKS

CONTACT ALQ
WhatsAPP:   +86 139 1400 8299
Email:   sales@sz-alq.com
Phone:   +86 139 1400 8299
Fax:   +86-512-6618 8458
          +86-512-6618 8468
Address:   No. 599 Tai Shan Road, High-tech Zone, Suzhou City, Jiangsu Province, China, 
Factory Building No. 4, Floor 4 North
ALQ Technology was founded in
2013 and is committed to providing 
safer and more reliable DC 
switchgear for the global market. 
We have a strong R&D team that 
closely focuses on customers' 
needs and pain points, delivering
targeted DC contactors / DC relays
to them. Endowed with rapid 
response capabilities, we 
continuously create greater value 
for our customers.

QUICK LINKS

CONTACT ALQ
WhatsAPP:   +86 139 1400 8299
Email:    sales@sz-alq.com
Phone:   +86 139 1400 8299
Fax:   +86-512-6618 8458
          +86-512-6618 8468
Address:   No. 599 Tai Shan Road, 
High-tech Zone, Suzhou City, 
Jiangsu Province, China, Factory 
Building No. 4, Floor 4 North
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