Best Modular Hybrid Transfer Panel for EcoFlow UltraUL 67 / UL 1008 Transfer Switch (SHP2)Full Panel Replacement
EcoFlow Smart Home Panel 2 vs. SPAN Smart Panel: 12-Circuit Subpanel vs. 32-Circuit Main
The $1,599 EcoFlow Smart Home Panel 2 (SHP2) combines a 100A automatic transfer switch (20ms UPS switchover), generator inlet controller, and 12 smart relay-controlled branch circuits in a single glass-front subpanel—specifically engineered for the EcoFlow Delta Pro Ultra.
Hardware Price
$1,599 (EcoFlow SHP2) vs. $3,500 (SPAN)
Turnkey Installed
$2,800 vs. $6,200
Battery Runtime Extension
+45% to +60%
Busbar / Circuits
100A / 12 Ckts
Key Master Electrician & ROI Takeaways
- ✓EcoFlow SHP2 costs less than half of a SPAN Panel ($1,599 vs $3,500) AND includes the automatic transfer switch (MID) built right in!
- ✓Accepts standard 1-inch Eaton BR, Square D Homeline, and Siemens QP breakers across 12 spaces while switching them via 12 internal smart relays.
- ✓Sub-20ms uninterrupted power supply (UPS) switchover keeps desktop PCs, servers, and medical equipment running without a flicker.
- ✓Whereas SPAN is a universal 200A 32-space load center for hardwired batteries (Tesla/Enphase/FranklinWH), EcoFlow SHP2 is a 100A 12-space smart subpanel exclusively for EcoFlow Delta Pro Ultra / Delta Pro 3.
Hardware & Busbar Specifications
- Model & Platform
- EcoFlow Smart Home Panel 2 (SHP2) vs. SPAN Panel Gen 2
- Enclosure Rating
- NEMA 3R Distribution Box + IP20 Battery Connection Module
- Relay & Breaker Architecture
- 12 Internal 60A Smart Relay Modules + Integrated 100A Auto-Transfer Switch + Generator Interlock
- CT Metering Accuracy
- ±1.0% across all 12 branch circuits + grid + generator + battery
- Communications & Local API
- Wi-Fi, Bluetooth, Ethernet, Proprietary EcoFlow Power Input/Output Cable
- Dimensions, Weight & Warranty
- 26.6 x 14.8 x 6.5 in · 43 lbs · 5-Year Warranty
Single-Line Wiring & NEC Topology
100A Smart Subpanel with Integrated Battery & Generator Transfer Switch
- Upstream Utility / MID Connection
- Fed by a 60A–100A 2-pole breaker from your existing 200A main panel + up to 50A 240V generator inlet.
- Solar & Battery Inverter Landing
- Up to 3x EcoFlow Delta Pro Ultra inverters (21.6kW continuous / 90kWh max storage) plug into the bottom Power Input/Output box.
- Neutral-Ground Bonding (NEC 250)
- Subpanel topology—neutral and ground bars remain isolated inside SHP2 (bonded upstream in main panel).
- Hardware Fail-Safe Behavior
- Manual physical grid/battery/generator selector and standard thermal-magnetic branch breakers.
3-Tier Dynamic Load Shedding & Battery Extension Matrix
| Priority Tier | Control Logic | Typical Connected Loads | Trigger Condition | Battery Runtime Impact |
|---|---|---|---|---|
| EcoFlow SHP2 Priority Circuits (Spaces 1–6) | 20ms UPS Continuous Backup | Home servers, refrigerator, well pump, furnace/mini-split, lighting | Instant <20ms transfer to Delta Pro Ultra on grid drop | Runs 2–5 days on 12kWh–18kWh Delta Pro Ultra stack |
| EcoFlow SHP2 Smart Shed Circuits (Spaces 7–12) | App / SoC Conditional Backup | 3-ton AC, electric water heater, dryer, EV charger (up to 40A) | Automatically opens relay when Delta Pro Ultra drops below user-set SoC % | Prevents 7.2kW single-inverter overload while allowing daytime solar dump |
2026 Hardware, Electrician Labor & Permit Cost Breakdown
| Line Item | Fair Cash Cost Range | Auditor Notes |
|---|---|---|
| EcoFlow Smart Home Panel 2 Hardware | $1,499 – $1,599 | Includes 12 smart relay modules AND built-in transfer switch |
| Electrician Subpanel & 12-Circuit Relocation Labor (4–6 hrs) | $900 – $1,600 | Mounts next to main panel; moves 12 circuits into SHP2 |
| Breakers, Conduit & Permit | $250 – $450 | Uses standard Eaton BR / Siemens / Homeline breakers |
Engineering Pros
- +Incredible value at $1,599 because it includes both the automatic transfer switch AND 12 smart relay circuits
- +Built-in 240V generator input with automatic switching between Grid, Solar/Battery, and Gas Generator
- +Uses standard off-the-shelf 1-inch circuit breakers
Limitations & Watchouts
- −Exclusively works with EcoFlow batteries (Delta Pro Ultra / Delta Pro 3)—cannot pair with Tesla or EG4
- −100A / 12-space subpanel capacity rather than a full 200A / 32-space main panel replacement
Frequently Asked Questions
Can I use the EcoFlow Smart Home Panel 2 with an EG4 or Tesla battery?
No. The EcoFlow Smart Home Panel 2 uses EcoFlow's proprietary high-current communication and AC coupling bus designed specifically for the Delta Pro Ultra and Delta Pro 3.
How is the Smart Home Panel 2 better than the original 1st-Gen EcoFlow Smart Home Panel?
The 1st-Gen SHP used proprietary relay modules and had a reputation for relay board failures. The Smart Home Panel 2 was completely re-engineered to use standard UL-listed 1-inch breakers (Eaton/Square D/Siemens), a 100A busbar, 20ms transfer speed, and up to 21.6kW of 240V split-phase input.
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