OffGridEmpire
Rich Solarvia AmazonUpdated < 1hr ago

400W Premium Kit — 2x200W + 40A MPPT

Real build cost

$1,058$650+$408 hidden

Ships missing Monitoring, Inverter, and 1 more — see receipt below.

Underpowered forRV / van life or weekend cabin
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Updated 2026-05-08Prices refreshed every 6hMethodology →

Solar

400W

Storage

None

Inverter

None

Cost / W

$2.65

Cost / Wh

N/A

System voltage

12V

Battery chemistry

N/A

What's included

57% complete
PanelsControllerBatteryInverterWiringMountingMonitor
Completion Gap Receipt
Advertised price$650
Required missing parts
+ Inverter~$159
+ Battery~$249
Hidden cost to finish+$408
Real build cost$1,058
+$408 hidden cost · 1.6x the advertised price

Real build cost = advertised kit + required missing parts only. Optional accessories and tools are not included in this total.

offgridempire.comPrice checked May 8, 2026
Methodology

Evidence

Cohort-normalized
Cost verdict
+$40863% gap — sticker is misleading
$650 advertised→$1,058 real
Completeness57%

Missing required parts:

MonitoringInverterBattery
Use-case fit
Underpowered for:RV / vanCabinShedEmergencyHomesteadBoat
vs 13 cohort peersLower = cheaper

54th percentile for $2.65/W

Deal status59 datapoints
Below tracked average
Install complexityLow
3 parts to source
Alternatives in cohortSame system type, similar specs

Cheaper in cohort

Eco-Worthy 200W 12V Starter Kit

$580 real build cost

More complete

WindyNation 400W Complete Kit — 1500W VertaMax Inverter

71% complete vs 57%

Better $/W

Eco-Worthy 400W 12V Premium Panel Kit — 40A MPPT

$1.95/W

Component breakdown

4 included · 3 missing
Monitoring

Not included

—

1×

Inverter

Not included

~$159

1×

Battery

Not included

~$249

1×

Solar Panels

Rich Solar 200W Mono

Included

2×

Rich Solar 200W Mono — 2x 200W = 400W total

Charge Controller

Rich Solar 40A MPPT

Included

1×

Rich Solar 40A MPPT — 40A MPPT

Wiring

MC4 + cables + fuses

Included

1×

MC4 + cables + fuses — Included cables + 30A fuse

Mounting

Z-bracket mounts

Included

2×

Z-bracket mounts — 2 sets Z-brackets

Total to complete~$408

Price history

Price History

— AT AVERAGE
All-time low: $616Average: $656Current: $650High: $746

Read further

From our research

category

Solar Panel Kits and Bundles

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how-to

How to Install a DIY Off-Grid Solar System (With Real Costs)

Step-by-step DIY install guide

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