SENS · MicroGenius (Engine Start Battery Chargers)

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SENS MicroGenius S4 Battery Charger

Batteries & Chargers

12-120VDC high-current switchmode battery charger system. 25-100A output using paralleled MicroGenius 2 modules. Internal redundancy, multiple battery banks, circuit breakers. For large-frame generators and mission-critical starting.

SENS SENS MicroGenius S4 Battery Charger generator — specifications and details

Overview#

The SENS MicroGenius S4 is a high-current battery charger system for large-frame generators and mission-critical starting applications. It uses the same proven MicroGenius 2 switchmode modules in a paralleled architecture, delivering 25 to 100 amps at 12-120VDC — four times the current of a standalone MicroGenius 2.

Where a single MicroGenius 2 handles small and mid-size generators, the S4 targets the heavy end: CAT 3500-series, Cummins QSK, and MTU 4000-series generators with large battery banks and high cranking current demands. The modular architecture means internal redundancy is built in — if one module fails, the remaining modules maintain charging.

When to spec the S4 vs the MicroGenius 2#

ApplicationMicroGenius 2MicroGenius S2MicroGenius S4
Current need6-25A20-50A25-100A
Battery banksSingleSingle or dual 25A2+ banks
Circuit breakersExternalIncludedIncluded
Internal redundancyNoOptionalYes
Surge suppressionExternalExternalIncluded
Typical generator20-500 kW500-1000 kW1000+ kW

Our service experience#

We specify the S4 for large-frame generator installations at hospitals, data centers, and water treatment plants. The modular design simplifies field service — a failed module can be hot-swapped without taking the entire charger offline. The integrated circuit breakers also eliminate a common installation problem: external breakers sized incorrectly for the charger output, which we see frequently on competitors' products.

Frequently Asked Questions

What is the MicroGenius S4 and how does it differ from the MicroGenius 2?
The S4 is a multi-module system using paralleled MicroGenius 2 chargers in a single enclosure, delivering 25-100A output. Where a single MicroGenius 2 tops out at 25A, the S4 scales by adding modules. The S4 also adds integrated circuit breakers, surge suppression, and support for 2+ independent battery banks — features needed for large-frame generators (1000+ kW) with heavy starting current demands.
What current range does the S4 support?
25A to 100A for genset applications, 12A to 100A for industrial applications. The current scales with the number of internal MicroGenius 2 modules. Each module provides up to 25A, so a 100A configuration uses four modules.
Does the S4 support internal redundancy?
Yes — because the S4 uses independent MicroGenius 2 modules, it can be configured with N+1 redundancy. If one module fails, the remaining modules continue charging. This is critical for mission-critical generators where a battery charger failure could lead to a no-start during a power outage.
Can the S4 charge multiple battery banks independently?
Yes — the S4 supports 2 or more independent battery banks with isolated outputs and individual circuit breakers. This is the standard configuration for generators with redundant starting systems (dual banks with a Best Battery Selector).

Need service for the SENS MicroGenius S4 Battery Charger?

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