Available for cabinet and containerized ESS configurations
Load sharing, automatic switchover, and silent night operation — the EMS and STS logic that keeps your rig running with zero interruptions.
Static Transfer Switch — solid-state switchover between cabinets, genset, or grid, faster than any mechanical breaker and invisible to your rig.
Intelligent EMS — the Energy Management System monitors every battery cluster’s state of charge in real time and balances load across all cabinets automatically.
Automatic Recharge — depleted cabinets drop into standby and recharge during low-load windows. The rig never sees a power gap.
On larger sites, two to five cabinets are paralleled as one system. All cabinets share the load together — not one at a time. When any cabinet’s state of charge drops below the 15–20% threshold, the EMS automatically redirects its load to cabinets with higher charge, and the depleted unit enters standby / recharge mode.
| Step | What Happens | Duration |
|---|---|---|
| 1 | All cabinets share the load together (load-sharing mode via master-slave busbar) | Normal operation |
| 2 | EMS monitors each cabinet’s state of charge in real time | Continuous |
| 3 | A cabinet’s SOC drops below 15–20% → EMS redirects its load to higher-SOC cabinets | < 20 ms via STS |
| 4 | Depleted cabinet enters standby / recharge mode | — |
| 5 | No rig shutdown, no manual intervention, no power gap | — |
In hybrid mode the ESS is the primary power source and the diesel genset stays off. When the cabinet’s state of charge falls below 15%, the EMS starts the genset and the STS transfers the load in under 20 ms — then, once the cabinet reaches 60% SOC, the system hands back to the ESS and the genset shuts down again.
| Step | What Happens | Duration |
|---|---|---|
| 1 | ESS supplies 24-h power; genset on standby, engine off | Normal operation |
| 2 | ESS SOC drops below 15% → EMS sends start signal to genset | < 5 sec genset start |
| 3 | STS transfers load from ESS to genset | < 20 ms |
| 4 | Genset runs and recharges the ESS through the PCS (bidirectional) | 3–4 hours |
| 5 | ESS reaches 60% SOC → STS transfers back; genset shuts down | < 20 ms |
| 6 | ESS resumes primary supply; genset off again | Normal operation |
| Event | Transfer Time | Rig Impact |
|---|---|---|
| Cabinet-to-cabinet (parallel mode) | < 20 ms (internal busbar) | None — seamless |
| ESS → diesel genset | < 20 ms + 3–5 sec genset start | None — STS bridges the gap |
| Diesel genset → ESS | < 20 ms | None — seamless |
| Grid → ESS (on grid failure) | < 20 ms | None — seamless |
20 ms is 1/50th of a 50 Hz cycle — far below the ride-through time of any VFD or motor controller on a drilling or workover rig. The rig never sees a power interruption.
From a 500 kW diesel genset, a full recharge takes 3–4 hours during low-load periods; at the maximum PCS rate from the grid, about 2.4 hours.
Together. Load-sharing is the default — all active cabinets discharge simultaneously, and a depleted unit drops off automatically. Sequential mode is available when you want to keep certain cabinets as a strategic reserve.
60–80% in an ESS + diesel hybrid, and 70–80% — up to 90–95% in near-fully-renewable configurations — when PV is added.
Want the numbers for your own site? Try our Diesel Savings Calculator.
Our engineers will size the right cabinet count for your rigs and camps — and show you the diesel savings before you buy.
