DIRA-4, Low Voltage Battery Alarm Unit

Technical Data

Nominal Voltage, V
Number of channels
Telecom, Power Utility, UPS
Low voltage level, V
9 – 11 (TBD at the order)
DIN – rail
2-pole relay «dry ouput»
Dimensions, mm
Weight, g
Warranty, months

Starting Price (EXW, excl VAT):

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YouTube Video



The main problem in the battery string is a finding “the weakest link”. When you have up to 16x12V batteries (4 parallel strings 48V) or up to40x12V batteries in the UPS –
it’s a difficult to find bad battery. Your Power System or UPS controls only Group (String) voltage. During discharge in the battery strings some of the batteries can goes down less than 10V.
Your UPS does not see that while individual 12V batteries destroy internal structure. Voltage level less than 9V for SLA (VRLA) batteries is a critical. And we need to know which batteries are. You need to check them more attentive. You may use discharge unit or MIDTRONICS tester or both for that.

Main features:

  • DIRA-4 controls only low discharge level (from 9.6 V to 10.8V)
  • Analog circuit technology: It’s simple and very reliable.
  • No need any software for DIRA sensors. LED indicator for every channel and one «dry output» for remote control.
  • Designed lifetime 20 years!


Low voltage battery alarm unit is a simple and very reliable battery monitoring unit for DC power systems (Telecom and Power Utility) or for UPS based on control individual 12V batteries in the battery strings.

What kind of discharge voltage level do I need for my batteries?

DC power system for 4h+ backup power.

For typical stationary applications SLA and VRLA batteries discharge voltage level 10.8V (1.8V/cell) because discharge is «slow» and it goes up to 10h.

UPS with 10 – 30 minutes’ backup power (up to 1h)

For UPS applications usually using «quick» discharge. Battery allows to discharge up to 9.6V level (1.6V/cell).



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