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ETA Engineering, Inc.
2010 E. University Dr. Suite 20
Tempe, AZ 85281
Phone: 480-
Toll Free: 1-
Fax: 1-
Note: Prices are subject to change without notice due to changes in other vendors' prices to us. These changes may arise from normal product development plus fluctuations in foreign exchange rates and commodity prices.
Charge Controller with LVD and Automatic Timer
15 Amp PBR with Timer, LVD
22 Amp PBR with Timer, LVD
Rated Input Current-
Surge Rating-
Voltage Available-
Load Current-
LVD (12 Vdc)-
LVD (24 Vdc)-
LVD (48 Vdc)-
Mounting Holes-
Hole Diameter-
Weight-
Dimensions (in)-
Rated Input Current -
Surge Rating -
Voltage Available -
Load Current -
LVD (12 Vdc) -
Mounting Holes -
Hole Diameter -
Weight -
Dimensions (in) -
Features of ETA Engineering Solar Battery Charge Controllers with Timer and LVD
Timing Feature
The PBRT Charge Regulator uses the input current of the PV array as a light sensor.
If darkness is detected, the PBRT turns on the load for the desired length of time.
A programmable dip-
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-
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-
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-
5 Year Warranty ETA Engineering stands by its products. All PBR Regulators have a
5 year performance warranty.
Installation Instructions
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 Charge Regulator Selection Guide
Nominal System Voltage
Rated Array Power
PBRL Model #
Rated Input Current
12 VDC
255 Wp
PBRT 12-
15 Amps
375 Wp
PBRT 12-
22 Amps
24 VDC
510 Wp
PBRT 24-
15 Amps
48 VDC
765 Wp
PBRT 48-
15 Amps
Battery Type Chart
LA -
D -
C -
LC -
A -
PL -
S -
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.
OEM, Dealer and Distributor Inquiries Welcomed.
©2001-
Last updated: December 19, 2008
PBRT Wiring Diagram
Installation and Operation Notes:
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-
3. When the battery reaches the pre-
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.