What Does a
Microgrid Cost?
Whole-home residential microgrid systems are scoped as complete engineering projects — not as products pulled off a shelf. The investment covers every required layer: battery modules and enclosures, power conversion hardware, backup generation and fuel infrastructure, transfer equipment, controls, electrical work, permitting, and commissioning. There is no meaningful standard price because project scope is determined by the property's peak load, autonomy target, generation sources, existing infrastructure, and site complexity.
What Drives the Total Cost
Six variables determine approximately 90% of system cost. Battery storage is typically the largest line item. Engineering and controls are not separable from the system — they are what make it a microgrid rather than a collection of components.
Scope also depends on electrical service capacity, required inverter output, battery energy capacity, solar generation capacity, generator integration, transfer or islanding equipment, electrical upgrades, and installation complexity. A critical-load design and a whole-home design require different equipment, wiring, and engineering because they support different portions of the property’s load profile.
Includes battery modules, enclosures, battery management system, inverter/charger hardware, wiring, and integration labor. Estate-scale whole-home systems require significantly more capacity than consumer products — the gap between what consumer batteries provide and what a large home requires is where most of the cost originates.
Must be sized to sustain the home's full load AND recharge the battery bank simultaneously — not just one or the other. Undersized generators create a system that cannot recover from a deep battery discharge. Generator selection, fuel type, and tank sizing all affect both upfront cost and long-term operating cost.
Solar is often the second-largest line item when included in the design. Its primary value in a microgrid context is reducing generator runtime during extended outages — lowering fuel consumption and operating cost over the system's life. Array sizing is determined by the system's charging requirements, not just normal electricity consumption.
The dedicated controller and transfer switch are what make the system a microgrid rather than a generator and battery at the same address. This layer handles source coordination, load management, and automatic failover. Consumer battery products do not include this — it is one of the primary reasons they cannot replicate microgrid capability.
No two properties are identical. Distance runs, panel upgrades, coastal specifications, flood-zone requirements, and integration with existing solar all affect labor and materials. Site complexity is the cost variable with the widest range — it cannot be estimated without a physical assessment.
Covers load analysis, system design, single-line diagram, permit applications, utility coordination, and final commissioning and testing. This work is not separable from the system — it is what ensures the system operates correctly and meets code. It is included in Prime Microgrid's project scope, not billed separately.
Typical Scope by Property Scale
These profiles illustrate how engineering scope changes with property scale. Every proposal is developed after reviewing the property's loads, infrastructure, operating goals, and site conditions.
System scope is property-specific. Request an assessment for a detailed proposal.
Cost vs. Consumer Products
These products solve different problems at different scales. The cost comparison is only meaningful if the coverage and runtime are equivalent — they are not. See the full technical comparison.
| Product | Investment Basis | Storage Capacity | Continuous Output | Whole-Home Coverage | Generator Integration | Runtime |
|---|---|---|---|---|---|---|
| Tesla Powerwall 3 | Packaged product | 13.5 kWh | 11.5 kW | No — select circuits | No | 1–3 hrs at full load |
| Generac PWRcell (18 kWh) | Packaged product | 9–18 kWh | 7.6 kW | No — select circuits | Limited | 2–5 hrs at full load |
| Enphase IQ Battery 5P | Packaged product | 5–15 kWh | 3.84–11.5 kW | No — select circuits | No | 1–4 hrs at full load |
| Prime Microgrid — Estate | Property-specific engineering | 40–80 kWh | 30–60 kW | Designed around property loads | Compatible equipment-dependent | Generation, storage, fuel, weather, and load-dependent |
Worked Cost Example:
7,500 sq ft Florida Estate
A coastal Florida property with central HVAC (3 zones, 15 kW combined), EV charging (two vehicles, 14 kW combined), pool equipment (5 kW), a wine cellar, full kitchen, and guest house. Peak load: ~42 kW. Average load: ~18 kW.
Owner requirement: sustain full home operation for 14+ days without manual intervention during hurricane season. Second home — no one present during outages.
Illustrative only. Actual cost requires a site assessment and load analysis — contact us for a detailed proposal.
Cost Questions Answered
Related Guides
Full technical breakdown of how a residential microgrid works.
Technical comparison of consumer products versus whole-home systems.
Load math showing why consumer batteries fail at estate scale.
When solar + battery is sufficient and when it isn't.
Everything Stays On.
Customer-sited generation + energy storage + backup generation + intelligent controls = whole-property power continuity.
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