Electrical Loads

Load inventory and analysis for off-grid system sizing — Rutland, VT

1. Load Inventory

Proxy values for initial planning. Hours/day reflect estimated duty cycles, not continuous run time. Refine after metering actual usage.

Load	Watts	Hours/Day	Daily kWh	% of Total
Refrigeratorcompressor cycling	150	8	1.20	19.3%
Well Pump (1/2 HP)	750	1	0.75	12.1%
Lighting (2,000 sq ft LED)	200	6	1.20	19.3%
Computer + Monitor	250	8	2.00	32.2%
TV (modern widescreen) x2	120	4	0.48	7.7%
Wireless Router	15	24	0.36	5.8%
Microwave (900W)	900	0.25	0.23	3.6%
Total	2,385	—	6.22	100%

Explicitly excluded: Induction range (~3,600W) — exceeds practical off-grid power budget. At peak draw, a single induction burner would consume 60% of the EG4 6000XP's continuous output capacity and would require dedicated high-amperage wiring.

2. Load vs. Production Summary

Total Daily Load6.2kWh/day

Total Monthly Load189kWh/month

System Daily Production6.5kWh/dayplaceholder — see Power page

Battery Capacity10.2kWh2x ECO-WORTHY Cubix 100

Daily Surplus+0.3kWh/dayproduction minus load

Inverter Headroom3,615W available6,000W max — 2,385W load

At 6.5 kWh/day average production and 6.2 kWh/day load, the system produces a 0.3 kWh/day surplus on average. Excess energy charges the battery bank. The 10.2 kWh battery provides roughly 1.6 days of autonomy at this load level (assuming 100% DoD; practical autonomy is ~80% of that with a minimum SoC reserve).Note: Daily production varies significantly by season. Winter average can be 3–4 kWh/day while summer can exceed 8 kWh/day. Load planning should account for worst-case months.

3. Automatic Transfer Switch (ATS)

An ATS enables seamless switchover between the solar/battery system and a backup source (generator or grid) when battery SoC drops below a threshold.

ATS Requirements

Rating	200A service entrance rated (typical residential)
Voltage	240V split-phase (matches EG4 6000XP output)
Type	Contactor-based or motorized, with utility-rated enclosure
Function	Monitors inverter output; switches to backup source (generator or grid) when solar/battery is unavailable. Prevents backfeed to either source.
Typical cost	$300–$600 for residential units

Example Products

Product	Rating	Est. Price
Generac RXSW200A3	200A, 240V, service entrance	~$500
Reliance Controls TCA1006D	100A, 240V, panel-mount	~$350
ASCO 185 Series	200A, 240V, residential	~$600

ATS cost ($300–$600) should be factored into total system balance-of-system (BOS) cost. The current BOS estimate on the ROI page is $450, which may need adjustment if an ATS is added.

4. Load Estimation Refinement

The load inventory above uses proxy values. Answering these questions will improve accuracy and inform circuit-level planning.

Main Panel

Electrical

What is the main panel amperage? (100A, 150A, 200A?)How many breaker slots total / currently used?What are the current circuit assignments?

Circuit Selection

Planning

Which circuits will be connected to the off-grid system?Are there any 240V loads (dryer, water heater, range)?Is there a sub-panel for critical loads?

Usage Patterns

Behavioral

Typical daily usage hours for each major appliance?Are loads seasonal (e.g., space heaters, window AC)?What hours of day are heaviest usage?

Seasonal Variation

Seasonal

Winter vs. summer lighting needs?Do any loads change seasonally?Generator supplement frequency expected?

Last updated March 2026. Load values are proxies for initial sizing. Actual consumption should be verified with a kill-a-watt meter or utility bill analysis before finalizing system design.