Rypos · Rypos Active DPF

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Rypos RH-DPF Active Diesel Particulate Filter

Aftertreatment Systems

Active DPF with electric regeneration for standby diesel generators 50-900 kW. CARB Level 3+ verified, BAAQMD/SCAQMD approved. No load bank required for regen.

Overview#

The Rypos RH-DPF is an active diesel particulate filter designed specifically for standby backup generators — machines that run infrequently but must comply with California's increasingly stringent air quality regulations. Its key innovation: electric regeneration that works at any load, eliminating the load bank requirement that makes passive DPF systems impractical on emergency standby generators.

With 1,300+ active DPF installations on standby generators nationwide and CARB Level 3+ verification, Rypos is the de facto standard for California generator DPF compliance.

The standby generator DPF problem#

Passive DPF systems (which rely on hot exhaust to burn off soot) don't work well on standby generators because:

Rypos solves this with active electric regeneration — a controlled heating element that burns accumulated soot in under 3 minutes regardless of engine load, using less than 1% of generator electrical output.

How electric regeneration works#

  1. Controller monitors differential pressure across the DPF (soot loading indicator)
  2. When regeneration is needed, electric heating element activates
  3. Filter reaches 700°C — soot oxidizes completely
  4. Process completes in under 3 minutes
  5. Can occur during normal exercise cycles or on-demand

No diesel fuel burner. No load bank. No ECU modification. No manual intervention.

California compliance landscape#

RegulationRequirementRypos meets?
CARB Level 3+85%+ PM reductionYes (up to 95%)
BAAQMD Rule 9-8DPF on data center generatorsYes
SCAQMDPermit conditions for new generatorsYes
NFPA 110No interference with 10-second startYes

Our service experience#

We specify Rypos for California compliance retrofits on existing Tier 2/3 diesel generators — particularly at data centers and hospitals where BAAQMD or SCAQMD require aftertreatment but the owner doesn't want to replace functioning generators. The electric regeneration is the clincher: facility managers don't need to schedule load bank sessions for DPF maintenance, and the filter stays clean through normal weekly exercise cycles.

Installation is straightforward — typically one day for the exhaust modification and control wiring. Remote monitoring confirms regeneration cycles are completing successfully. Maintenance is minimal: visual inspection every 1,000 hours.

Frequently Asked Questions

Why does a standby generator need a DPF in California?
California air districts (BAAQMD, SCAQMD) increasingly require particulate matter controls on diesel standby generators — even those running under 100 hours/year. CARB Rule 9-8 and similar regulations mandate Level 3 or better emission controls on new and existing emergency generators at data centers, hospitals, and other large facilities.
What makes Rypos different from passive DPF systems?
Passive DPFs (like Johnson Matthey CRT+) rely on exhaust heat to burn off soot. Standby generators rarely reach the temperatures needed for passive regeneration because they run infrequently and often at low load. Rypos uses active electric regeneration — a heating element burns soot at 700°C in under 3 minutes using less than 1% of generator output. This works at ANY load, including idle. No load bank required.
Does the Rypos DPF require a load bank for regeneration?
No — this is the key advantage. Passive DPFs and some active systems require load banking to generate sufficient exhaust temperature. Rypos' electric regeneration is independent of engine load. The filter can regenerate during a no-load exercise cycle.
What size generators does the RH-DPF fit?
The RH-DPF covers 50-900 kW generators. For larger units (1 MW+), Rypos offers the ADPF model. For combined PM + NOx control, the Tier IV DPF+SCR system covers 400 kW to 3 MW.
Does DEF (urea) need to be added?
Not for the RH-DPF alone — it's a DPF-only system that reduces particulate matter without SCR. If NOx reduction is also required (for full Tier 4 Final or specific air district mandates), Rypos offers a combined DPF+SCR system that does require DEF.
How is the Rypos installed?
Retrofit bolt-on to existing exhaust system. No ECU reprogramming required. Typically installed in one day by a qualified technician. Backpressure is maintained below engine OEM specifications.

Need service for the Rypos RH-DPF Active Diesel Particulate Filter?

Our technicians work on every major component OEM. We stock common parts and source rare ones.

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