Charge Controller with LVD and Automatic Timer

Features of ETA Engineering Solar Battery Charge Controllers with Timer and LVD

DC Load Controller with Low Voltage Disconnect (LVD)
The PBRL Charge Regulator incorporates a DC load controller that can automatically detect low battery voltage and disconnect power
 to the DC load. After the battery bank has sufficiently recharged, the PBRL automatically reconnects the DC load. This feature can
 significantly increase life of the battery bank.

Patented Parallel Switching Shunt
When the maximum charging voltage at a given temperature
is reached, the patented parallel switch (U.S. Patent #4661758)
automatically shunts the incoming PV array current.

Temperature Compensation
To extend battery life and prevent stratification, the PBR
Regulators automatically adjust the maximum charge voltage
for the temperature of the batteries.

Durable Construction
Unlike most charge regulators on the market, ETA
mounts the regulator's circuit board in an anodized 
aluminum heat sink or enclosure and then encapsulates
the board in an epoxy-resin. This manufacturing process
ensures that the regulator circuitry will be protected from
the environment.

Pulse Width Modulation
Automatically adjusting to the load requirements, battery
state of charge, and battery age, Pulse Width Modulation (PWM) 
brings the battery up to maximum charge without trickle charging. 
High charge rates maintain current density across the surface of 
the plates, maximizing battery life. This design continuously adjusts 
to the battery requirements as opposed to 3-stage charging.

Overload & Transient Surge Protection
All regulators provide an overload rating of twice the specified
input current for 20 seconds. Solid state transient absorbing
avalanche diodes protect the regulators from lightning induced
surges and inductive load spikes.

Solid State Electronics
For reliability, ETA Engineering Charge Regulators have no moving
parts that can fail due to excessive wear and operation. To ensure
safety, ETA excludes the use of mercury switches from all of our 
regulator designs.

High Reliability
These designs use High Safety Factors to minimize stress
on all critical components, which gives exceptional life.
Products using this design installed in the late 1980's 
are still going strong

High Efficiency
The regulators contain blocking diodes chosen for minimum
forward voltage drop which maximizes charging current from
the PV module(s). The static current draw is only about 2 ma 
plus the current to drive any LED that may be on.

Easy to Install
PBR regulators are pre-set to operate with your particular 
battery type. The unit requires no programming or adjustment.
Just make your hard-wire connections and begin charging!

5 Year Warranty
ETA Engineering stands by its products. All PBR Regulators have
a 5 year performance warranty.

1. Bare wire connections under the PBRT charge regulator terminal blocks are acceptable. PBRT models accept up to two #10 gauge bare wire inputs under each terminal clamp.

2. When the battery temperature reaches the pre-set maximum voltage level at a given temperature, the PV module input will be shorted ("shunted") to a value near zero volts. The battery voltage will gradually drop back to a lower voltage, at which point the regulator will release the PV input, and charging will resume.

3. When the battery reaches the pre-set low voltage level at a given temperature, the regulator shuts the load down until the battery voltage is restored to one volt above the low voltage level.

4. The "Shunt" and "LVD" voltage level are factory set. No field adjustments are required..

5. The settings of the programmable dip switches determine the operational time of load. Time adds together when multiple switches are placed in the on position.

When installing the PBRT charge regulator, locate or mount the unit in or near the battery storage location. This will allow the charge regulator to approximate the temperature of the battery system and ensures that temperature compensation takes place.

Wiring Instructions

1. Ensure that the photovoltaic array is properly wired to match the nominal operating voltage of the regulator and battery system. Proper wiring diagrams for PV module/array can be obtained from the manufacturer or system designer. Identify the positive and negative leads of the PV array prior to connecting the charge regulator.

2. Connect the battery leads to the terminal blocks on the PBRT charge regulator labeled "Battery", also ensuring that the polarity of the battery leads are matched to the polarity of the terminal blocks.

3. Due to the regulator's very high efficiency, it will be destroyed if hooked up improperly. Connect the PV array input leads to the terminal blocks on the PBRT Charge Regulator labeled "PV Array", ensuring that the polarity of the input leads are matched to the polarity of the terminal blocks.
(positive to positive, negative to negative)

4. Connect the negative and positive leads of the load to the terminal block labeled "Load", ensuring that the polarity of the load leads are matched to the polarity of the terminal blocks.
(positive to positive, negative to negative)

Note: the regulators are protected if the battery connections are removed and the PV array remains connected. (It will rapidly turn on and off without overheating)

PBRT Selection Guide Instructions
1. Determine the nominal operating voltage of your PV array and battery system.
2. Select the rated array power.
3. The PBRT model listed to the right is recommended for use with your system.
4. Use the Battery Type Chart to determine your battery chemistry configuration.