Off-Grid System Sizing Studio

Contractor & Client Proposal Metadata

Design Load Profile & Energy Budget

Calculated continuous demand and inductive motor surge requirements

Equipment / ApplianceWattsSurge FactorHours/DayDaily WhAction
1.5 HP Submersible Well Pump1400W4.2x2,800 Wh
Residential Refrigerator160W3x1,600 Wh
Starlink Terminal + Router75W1x1,800 Wh
Mini-Split Heat Pump1200W1.6x9,600 Wh
Daily Demand

15.8 kWh/day

Continuous: 2835W
Peak Inductive Surge

7,315 W

Inverter: 24000W (PASS)
Storage Required

87.04 kWh

17 × 5.12 kWh modules
PV Array Required

5.13 kWdc

12 × 450W modules

Equipment Schedule & Proposal Pricing

Itemized bill of materials with balance-of-system & commissioning labor

30-Day Fixed Bid
Item ClassificationSpecificationQtyWarrantyCost Subtotal
Hybrid Inverter SystemSol-Ark 15K All-In-One Hybrid110 Years$6,850
Energy Storage BankEG4 LL-S 48V 100Ah Server Rack (5.12kWh) (87.04 kWh total)1710 Years$23,783
Photovoltaic FieldREC Group Alpha Pure-RX 450W Bifacial (5.13 kWdc)1225 Years$3,180
Balance of System (BOS)Ground mount racking, rapid shutdown, DC/AC disconnects, conduit & wire5400 WStandard$2,430
Installation & CommissioningCertified electrical labor, system programming, commissioning & signoff5400 W2 Yr Labor$4,590
30%
10%30% (Standard)50%
$0.45/W
$0.20/W$0.45/W$0.80/W
$0.85/W
$0.40/W$0.85/W$1.50/W
Turnkey Contract Price

$58,333

Installer Gross Profit: $17,500 (30%)
Est. 30% Clean Energy Tax Credit

-$17,500

IRC Section 25D Residential Energy Credit
Net Client Investment

$40,833

Effective net cost post-incentive

Scope & Notes: Includes complete turn-key mounting, certified wire runs, and off-grid commissioning.

NEC Article 690 String Engineering Verification: Array configured for 4 to 8 modules per MPPT series string, verified for continuous operation from -20°C ambient winter low to 65°C cell summer ceiling.