12 / 36 V @ 20 Amps Battery Equalizer and DC Autotransformer

Application

This rugged and versatile unit is used to power a small load at 12 V from a 36 V battery, or to power a small 36 V load from a 12 V battery.
It functions both ways, producing 12 V @ 20 Amps from a 36 V input or can be connected backwards to produce 36 V @ 6 Amps from a 12 V input.

When connected as a battery equalizer, it allows large transient 12 V loads to be taken off the centre tap of a 36 V battery (made of 3 X 12 V batteries) without fear of upsetting the voltage balance of the battery and destroying the 36 V battery system that would otherwise occur.

Model: EQ 12/36-20

Product similar to photo.

Features

  • >95 % efficiency, typically 96 % over 20 % load
  • Simple to use
  • Bi-directional power flow
  • Weatherproof, NEMA 4 enclosure

Electrical Specifications


Input low side Input high side
Input Voltage (nominal battery) V 12V 36V
Output Voltage 36V 12V
Output Current 6A
Current Limited		 20A
Current Limited
Ripple at load 30mV rms 30mV rms
Efficiency >95% >95%


Voltage Regulation Mode

Proportional:
    This standard unit regulates the output voltage proportional to 1/3 the input when connected 36 V input and regulates the output to 3 X input when connected to 12 V input. This characteristic, when connected across 3 X 12 V batteries in a 36 V configuration, will keep the batteries at equal voltages.
Fixed:
    Special units are available for example EQ 12/36-20 RXX where XX is the voltage on the 12 V side that the voltage is to be regulated to. For example, EQ 12/36-20 R13.6 will output 13.6 V @ 20 amps to either power a 12 V load or charge a 12 V battery to 13.6 V.
Note: For units that require a fixed voltage at the higher voltage output, for example, to charge a 36 V battery from a 12 V battery, use one of the Constant Voltage Regulators

Mechanical Specifications

Enclosure:

  • Weatherproof, NEMA 4 enclosure

Dimensions:

  • 4.5" X 2.5" X 2" nominal, resembling a junction box with feet

Weight:

  • approx. 2 lbs.

Temperature Range:

  • -40 deg C to 60 deg C
  • It is recommended, as with all electronics, that the unit not be placed in direct sunshine

Terminations:

  • 6" Flying Leads
  • Red = High Input +
  • Black = Common Neg. - for input and output voltage
  • White = Low Input +

Wire size:

  • Red, Black, White: Power leads #12 AWG

Humidity:

  • N/A weatherproof

Mechanical Drawing: Click here for picture

Note: In the interest of continuous product improvement, specifications subject to change without notice.

Order Model No:

EQ 12/36-20

EQ 12/36-20 RXX where XX is the specified regulated voltage on the 12 V side

March 2002