Best Overall 200A Smart Load CenterUL 67 / UL 916 / UL 1741 PCSFull Panel Replacement
SPAN Smart Panel (Gen 2) Complete Engineering Teardown & Review
The SPAN Panel Gen 2 replaces your legacy 200A main or backup load center with 32 individually solid-state/hybrid relay-controlled circuits, native NEC 705.13 Power Control System (PCS) busbar clamping, and automatic State-of-Charge (SoC) load shedding that extends 13.5kWh home battery backup runtime by 40% to 65%.
Hardware Price
$3,500 – $3,800
Turnkey Installed
$5,200 – $7,500
Battery Runtime Extension
+40% to +65%
Busbar / Circuits
200A / 32 Ckts
Key Master Electrician & ROI Takeaways
- ✓Replaces the messy 'critical loads subpanel' entirely—all 32 circuits remain backed up and dynamically prioritized via the SPAN Home App.
- ✓Accepts standard 1-inch Eaton BR, Square D HOM, and Siemens QP thermal-magnetic circuit breakers while switching loads via internal 90A latching relays.
- ✓Certified under UL 1741 PCS and NEC 705.13 to prevent 200A main busbar overload, eliminating $6,000–$15,000 utility 400A service upgrades when adding EVs and heat pumps.
- ✓Direct local API/CAN/RS-485 integration with Tesla Powerwall 3, Enphase IQ8/5P, and FranklinWH to shed HVAC and water heaters automatically below 50% SoC.
Hardware & Busbar Specifications
- Model & Platform
- SPAN Panel MLO 32 (Gen 2 - 1-00200-xx)
- Enclosure Rating
- NEMA 3R (Indoor / Outdoor Rainproof)
- Relay & Breaker Architecture
- 32 Internal 90A latching electromechanical relays ahead of standard plug-in thermal-magnetic breakers
- CT Metering Accuracy
- ±0.5% revenue-grade per-circuit current sensing across all 32 branch spaces + 200A main lugs
- Communications & Local API
- Dual-band Wi-Fi, Ethernet (RJ45), Cellular LTE Backup, RS-485 / CAN bus
- Dimensions, Weight & Warranty
- 39.6 x 14.3 x 6.0 in · 62 lbs · 10-Year Warranty
Single-Line Wiring & NEC Topology
Whole-Home Microgrid Load Center Behind MID / Gateway
- Upstream Utility / MID Connection
- Fed from Tesla Backup Gateway 2/3, Enphase IQ System Controller 3G, or FranklinWH aGate via 200A 240V split-phase Cu/Al conductors.
- Solar & Battery Inverter Landing
- Up to 90A backfed solar/storage breaker on designated corner lugs or upstream hybrid MID landing.
- Neutral-Ground Bonding (NEC 250)
- Configured as downstream subpanel when behind a Service Entrance (SE) rated MID; floating neutral bus with isolated ground bar.
- Hardware Fail-Safe Behavior
- Latching relays default to CLOSED (energized) state if logic board power fails, ensuring manual breaker operation always works.
3-Tier Dynamic Load Shedding & Battery Extension Matrix
| Priority Tier | Control Logic | Typical Connected Loads | Trigger Condition | Battery Runtime Impact |
|---|---|---|---|---|
| Must-Have (Tier 1) | Keep On Until 0% SoC | Refrigerator, freezer, well pump, sump pump, Wi-Fi router, medical CPAP, kitchen lighting | Remains energized throughout entire outage until battery low-voltage cutoff | Baseline 1.2 kW average draw (~11–18 hrs on 13.5kWh + solar recharge) |
| Nice-to-Have (Tier 2) | Shed Below 50% Battery SoC | 3-Ton Heat Pump / AC compressor, induction range, microwave, home office circuits | Automatically opens internal relay when battery SoC drops below 50% or during dark winter storms | Saves 14–22 kWh/day, extending backup duration by +42% |
| Non-Essential (Tier 3) | Shed Immediately on Grid Loss | 48A EV Charger, electric clothes dryer, pool pump, hot tub heater, electric resistance water heater | Trips open within 100ms of utility grid loss; only re-energizes when excess solar >4kW & battery >85% SoC | Prevents instantaneous 11.5kW inverter overload trip and saves 25+ kWh/day |
2026 Hardware, Electrician Labor & Permit Cost Breakdown
| Line Item | Fair Cash Cost Range | Auditor Notes |
|---|---|---|
| SPAN Panel Gen 2 Hardware (32-Space) | $3,500 – $3,800 | Includes main lugs, internal CTs, and LTE/Wi-Fi comms module |
| Licensed Electrician Main Panel Swap Labor (8–12 hrs) | $1,500 – $2,800 | Labeling, extending branch circuit homerun wires, torqueing 32 circuits |
| New Branch Breakers & Arc-Fault/GFCI Upgrades | $250 – $550 | Eaton BR / Siemens QP / Square D Homeline listed breakers |
| AHJ Electrical Permit & Utility Meter Pull Coordination | $150 – $400 | Eligible for 30% IRA Section 25C ($600 cap) or 30% Section 25D when bundled with battery |
Engineering Pros
- +Universal breaker compatibility (Eaton BR, Square D Homeline, Siemens QP) lowers replacement breaker cost
- +Eliminates the 12-circuit critical loads subpanel during battery installations
- +Dynamic Power Control System (PCS) prevents 200A main breaker trips when running EV + heat pump + induction stove
- +Best-in-class consumer mobile app with real-time per-circuit watt graphs and solar self-consumption routing
Limitations & Watchouts
- −High upfront hardware cost ($3,500+) compared to a standard $250 copper busbar load center
- −Internal relays are NOT overcurrent protection devices—still requires physical thermal-magnetic breakers
- −Requires certified SPAN installer commissioning via the SPAN Installer App
Frequently Asked Questions
Does the SPAN Panel qualify for the 30% federal solar tax credit?
Yes. When installed in conjunction with a solar + battery storage system (IRC Section 25D) or as an enabling electrical panel upgrade under IRC Section 25C (up to $600 standalone credit, or 30% uncapped when part of a qualified battery storage installation), homeowners can significantly reduce net out-of-pocket costs.
What happens if SPAN's cloud servers go down or Wi-Fi fails during a blackout?
All load-shedding rules, battery SoC communications (via local LAN/RS-485/CAN), and NEC 705.13 busbar current limits execute locally on the SPAN Gateway processor inside the panel. Furthermore, the latching relays fail-safe in the closed position so physical breakers operate normally.
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