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Uninterruptible Power Supply Options for Tactical Communications

A dropped net costs more than any power system. Here are the UPS architectures available to tactical communications, what each protects against, and how to size one for the field.

NUE Field GuideUpdated Nov 20268 min read
The short answer

UPS options for tactical communications range from offline/standby UPS (lowest cost, a few-millisecond transfer), to line-interactive (voltage regulation), to online double-conversion (zero transfer, clean output, most protection), to an always-on battery architecture in which a rugged battery generator powers the comms stack continuously while solar, vehicle or generator sources recharge it. In the field, the always-on approach provides UPS-like continuity plus hours of runtime.

OfflineCheap; brief transfer gap.
Line-interactiveRegulates sags and swells.
OnlineZero transfer; best protection.
Always-on batteryContinuity + long runtime.

01UPS topologies compared

TopologyHow it worksTransfer timeProtects againstField fit
Offline / standbyLoads on source power; switches to battery on failureTypically several msOutagesGarrison, non-critical
Line-interactiveAdds voltage regulation; switches on failureTypically a few msOutages, sags, swellsShelters on grid or generator
Online double-conversionLoads always run from inverter fed by battery/rectifierZeroOutages, sags, surges, frequency drift, noiseCritical C2 on generator power
Always-on battery generatorLoads always run from battery; sources only charge itNone while battery has chargeSource loss, generator stops, solar dipsExpeditionary comms; silent ops
Transfer times vary by product; request the vendor's specification.

02Why generators make UPS essential

Tactical generators produce power that can sag under step loads and drift in frequency. Sensitive radio chargers, crypto equipment and servers do best on conditioned power. A battery between the generator and the loads — either an online UPS or an always-on battery generator — absorbs those transients and keeps the net up when the generator stops for fuel or maintenance.

Always-on battery architecture
01Generator / solar / vehicleany source02Battery generatorstores + inverts03Comms stackcontinuous
Sources can come and go; loads never see the transition.

03Sizing a tactical UPS

  1. Sum the protected load

    Only comms and C2 — not lighting or comfort loads.

  2. Set the ride-through time

    Minutes (to start a generator) or hours (to cover a night or a fuel cycle).

  3. Size the inverter

    Continuous rating ≥ 1.25× protected load.

  4. Size the battery

    Load W × ride-through hours ÷ 0.85.

  5. Confirm transfer behavior

    For pass-through charging units, test the switchover with your actual equipment.

Ride-through at a 150 W protected comms load
Typical small UPS (~300 Wh)~1.7 hSunCase 605~3.1 hSunCase 1213~7.4 hSunCase 2425~14 h
Usable energy ÷ load. Small UPS figure is illustrative for a typical rack/tower unit.

Test before you trust

Many portable power stations can power loads while charging (pass-through). Transfer behavior differs between products and configurations. NUE engineers will help validate SunCaseâ„¢ pass-through behavior with your specific comms equipment before deployment.

Small team / patrol base
SunCaseâ„¢ 1213
Output
1,200 W
Storage
~1,300 Wh LiFePO4
System
24 V
Weight
~34 lb

One-person carry with team-level capacity for radios, EUDs, drone batteries and SATCOM.

View SunCaseâ„¢ 1213Get a configured quote

04Frequently asked questions

What is the best UPS for tactical communications?
For fixed shelters on generator power, an online double-conversion UPS offers the best protection. For expeditionary and silent operations, an always-on rugged battery generator that powers comms continuously while sources recharge it provides UPS-like continuity with hours of runtime.
What is UPS transfer time?
The brief interval between source failure and battery takeover. Offline and line-interactive units typically switch in a few milliseconds; online double-conversion units have zero transfer time.
Can a portable power station be used as a UPS?
Many can power loads while charging, which provides backup when the source drops. Transfer behavior varies, so test with your equipment. For zero-transfer continuity, run loads from the battery at all times.
How long should a tactical UPS run?
At minimum long enough to start and stabilize a backup source. Expeditionary units often size for several hours to cover generator refueling, maintenance or a night of silent operation.

More in Tactical Comms

Section hubTactical Comms →LibraryAll 25 military power field guides →

Related field guides

GuidePortable Power Systems for Military Communications EquipmentGuideMilitary Portable Power Compatible with Night Vision GearGuideBest Rugged Power Banks for Charging Tactical EquipmentGuideModular Power Systems for Deployable Command CentersGuideHow to Choose Reliable Portable Power Sources for Military Missions
Sources & references
  1. Defense Advancement — military power supplies
  2. Defense Advancement — power & EMI standards

Published by New Use Energy (NUE), a veteran-led portable power company and manufacturer of the SunCaseâ„¢ line. Where we compare our products to other categories or companies, we say so. Specifications are nominal; confirm the current datasheet before procurement. Planning figures for device loads are typical values; measure your own equipment. Last updated 2026-11-03.

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