3.5kW Off-Grid Solar Power System with 48V Battery Storage & 6×440W Panels

ROCKSOLAR 3.5kW Home Solar Power System

Complete off-grid system for cabins, tiny homes, workshops, and remote properties — inverter, battery, and solar panels all matched and ready to install.

What's included:

• Inverter: Growatt SPF3500TL — 3,500W continuous, pure sine wave, integrated MPPT charge controller
• Battery: 1 × 48V 74Ah lithium battery — 3.55kWh storage
• Solar array: 6 × 440W monocrystalline panels — 2.64kW total
• Mounting hardware, cabling, fuses/breakers, documentation

Key features:

• Pure sine wave output — safe for sensitive electronics
• Integrated MPPT — maximizes solar harvest, simplifies wiring
• Generator-ready input — backup during low sunlight
• Expandable battery — add capacity later without replacing the system
• Pre-matched components — no manual sizing required

Built for: Off-grid cabins, tiny homes, workshops, farm buildings, remote offices, emergency backup power

Performance overview:

• Continuous AC output: 3.5kW
• Battery storage: 3.55kWh
• Solar array: 2.64kW
• Estimated daily solar production: 10–14kWh (varies by location/season)
• Generator backup: supported
• Battery expansion: supported

• Shipping: Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days depending on your location.
• Returns: You may return or exchange products within 30 days of receiving your order. Items must be in original condition with proof of purchase.
• If your item is defective or damaged due to manufacturing issues, we’ll gladly replace it at no additional cost.