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PRO 15.84kW — EG4 FlexBoss21+ GridBoss, 28.6kWh LiFePO4

Real build cost

$19,859

Complete kit — advertised price is the real price.

Best forRV / van life, weekend cabin, and shed / workshop
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Updated 2026-10-15Prices refreshed every 6hMethodology →

Solar

15840W

Storage

28.6kWh

Inverter

16000W

Cost / W

$1.25

Cost / Wh

$0.69

System voltage

48V

Battery chemistry

LiFePO4

What's included

86% complete
PanelsControllerBatteryInverterWiringMountingMonitor
Complete Kit — Advertised Price Is the Real Price

All required components for a working system are included. No additional purchases needed.

Verified Oct 15, 2026Methodology

Evidence

Cohort-normalized
Cost verdict
—Advertised price ≈ real build cost
$19,859 advertised→$19,859 real
Completeness86%

Complete as sold — every standard role ships in the box.

Use-case fit
Best for:RV / vanCabinShedEmergencyHomesteadBoat
vs 15 cohort peersLower = cheaper

0th percentile for $1.25/W

33th percentile for $0.69/Wh

Deal status133 datapoints
At or near tracked low
Install complexityModerate
48V wiring + breakersLicensed electrician
Alternatives in cohortSame system type, similar specs

Cheaper in cohort

ELITE PLUS 7.92kW — Sol-Ark 15K, 20.48kWh LiFePO4

$15,489 real build cost

Component breakdown

6 included · 0 missing

Price history

Price History

▼ 6% BELOW AVG
All-time low: $19,859Average: $21,217Current: $19,859High: $22,689

Last observed at retailer: Oct 15, 2026. Days between observations carry the most recent known price — not new data.

Where to buy

Where to Buy3 in stock
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$19,859
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$23,359
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$27,859
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Price Drop Alert

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