Upne-Tech SLAC-MH User Manual

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SLAC-MH Solar street light controller

User Manual

Thank you very much for choosing our product. This product manual
provides important information and advices for product installation, use
and troubleshooting. Before using this product, please read carefully and
thoroughly.

SLAC-MH is specially designed for small home solar systems with low

cost and high performance. It has a number of outstanding features:

The controller adjusts itself automatically to 12V or 24V system voltage.

Sophisticated programmable nightlight function.

Clear readable LED display of the state of charge.
4 stage charging(Main,boost, equalization, float) for flooded battery, 3
stage charging(Main,boost, float) for sealed battery.
Enclosed by aluminum shell and potted by epoxy with high thermal
conductivity. Protection grade reaches IP68.

Safety recommendations

Recommend a wire diameter: SLAC -MH5A/10A: 1.5 mm²; SLAC ­MH15A: 2.5 mm ²,ensure the battery and the controller between the
cable length as short as possible, to prevent controller misjudge battery

voltage.

Connect the controller by following steps to avoid installation faults.

1. Connect the wire to the controller, then to the battery.

2. Connect the wire to the controller, then to the photovoltaic modules.

3. Connect the wire to the load, then to the controller.

（3） （1） （2）

Starting up the controller:

Self Test

As soon as the controller is supplied with power either from the battery or
the solar array, it starts a self test routine. Then the display changes to
normal operation.

System Voltage

The controller adjusts itself automatically to 12V or 24 V system
voltages. As soon as the voltage at the time of start-up exceeds 20.0V,
the controller assumes a 24V system. If the battery voltage is not
within the normal operation range at start-up, a status display according
to the section ERROR DESCRIPTION occurs.

LED Status and Display

SLAC-MH Controller has five LEDs. One green LED is for charge
display, three yellow LEDs are for the state of charge display, and one
red LED is for the status of load display.

Normal operation Description

LED

Status

Function

Green

LED

On

Main charge during daytime

Slow flash

Float charge

Fast flash

Equalization charge

Off

Controller connected to battery, night

detected.

Yellow

Yellow LED 1(L) on

Battery power low

LED

Yellow LED 2(M) on

Battery power medium

Yellow LED 3(H) on

Battery power high

Red

LED

Off

Normal operation

Flash

Overload or Short-circuit of load

Error Description

Loads are not

supplied.

Indication

Cause

Corrective action

Battery is low

（Red LED on）

Load will reconnect as

soon as battery is

recharged

Over current /

Short circuit of

loads（Red LED

flashing）

Switch off all loads.

Remove short circuit.

Controller will switch on

load automatically after

max 1 minute.

Battery voltage

too high

(>15.5 / 31.0 V)

Check if other sources

overcharge the battery. If

not, controller is damaged

Battery wires or

battery fuse

damaged, battery

has high

resistance

Check battery wires, fuses

and battery. Remove

faults.

Battery is low

after short

time.

Battery has low

capacity（Red

LED on）

Replace the battery.

Battery is not

being charged

during

daytime.

Solar array faulty

or wrong polarity

（

Green LED

off）

Check solar array and

wiring. Remove faults.

Safety Features

PV terminals

Battery terminals

Load

terminals

Reverse

polarity

24V system: no

12V system: yes

Protected

Protected

Short circuit

Protected

Protected (with fuse

on battery) (3)

Protected

Over current

Protected

Protected

Switches off

with

a delay (3)

Reverse

charge

Protected

No effect

No effect

Over voltage

Max. 55V

Max. 55V

Switches off

with a

delay

Under voltage

No effect

No effect

Switches off

above

15.5/31.0 V

Over

temperature

When over temperature occurs, the controller will
reduce the charging current. If the temperature of
controller reaches a high level, the load will
automatically be switched off.

(1) Controller can protect itself, but load might be damaged.
(2) We strongly recommend that add a fuse between battery and controller.

The battery may be permanent damaged when short circuit occurs.

(3) > 200% rated current: Load will be switched off with 3s delay.

Warning: Two or more error conditions at the same time may cause
damage to the controller. Always remove the present fault condition
before next operation

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SLAC-MH Technical Characteristics

Model

SLAC-MH

10A 15A 20A

Max. charge/load current

10A 15A 20A

Rated System voltage

12V/24V auto recognition

Main charge

14.4V/28.8 V (25 °C), 30 min. (daily)

Boost charge

14.4/28.8 V (25 °C), 2 h
Activation: battery voltage < 12.3/24.6

V

Equalization voltage

14.8/29.6V(25 °C) 2 h

Activation: battery voltage < 12.1/24.2 V

Float charge

13.8/27.6 V (25 °C)

Deep discharge
protection,
Cut-off voltage

11 – 12 V/22 – 24 V
Reconnect level

12.8/25.6V

Under voltage protection

10.8/21.6V

Overvoltage protection

15.5/31.0 V

Self consumption

4mA-5mA（12V）
6mA-8mA（24V）

Max. panel voltage

50V

Temperature
compensation

-4mV/Cell*K

Grounding

Positive grounding

Battery type

Lead acid (GEL, AGM, flooded)

Ambient temperature

-40°C-+60°C

Dimensions

50mm*56.6mm*20mm

Wire Length/size

150mm/2.5m²

Ambient temperature

-40°C-+60°C

IP grade

IP68

Max. altitude

4000m

Weight

130g

Subject to change without notice.
Version: 20140530
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