3.5 kW Off-Grid Solar System
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3.5 kW Off-Grid Solar System
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What it is, and what it is for
3.5 kW Off-Grid Solar System: 2.7 kW of panels, 5 kWh LiFePO4 battery, 120 V output
A complete off-grid power system for a cabin, a cottage, a workshop or a small home with 120 V loads: six 450 W bifacial panels, a Growatt SPF 3500TL LVM-US inverter-charger with its own 80 A MPPT, and a 5 kWh 48 V LiFePO4 battery. In most of the US the array makes 10 to 13 kWh on a clear day, which covers a fridge, freezer, lights, water pump, internet, a TV and a laptop with charge to spare, and the battery carries the essentials through the night.
What's included:
- 6 × JA Solar JAM54D41 LB 450 W N-type double-glass bifacial panels (2,700 W), MC4 leads, 12-year product and 30-year performance warranty
- Growatt SPF 3500TL LVM-US off-grid inverter-charger: 3,500 W continuous, 6,000 VA surge, pure sine 120 V, built-in 80 A MPPT (up to 4,000 W of PV, 280 V max), 40 A AC charger from a generator or grid, 10 ms transfer, Wi-Fi monitoring; 2-year warranty
- 5 kWh 48 V LiFePO4 battery: Option 1 Growatt ALP 5.0L-C1 (3 kW charge/discharge, 6,000 cycles at 92% DoD, expandable in parallel, 10-year warranty) or Option 2 GSL 5 kWh
- MidNite Solar MNBIGBABY breaker box with a 15–63 A 300 V DC breaker for the PV input
- ROCKSOLAR PV cable pair with MC4 connectors
Mounting rails and racking are not included; they are quoted with the installation once the roof or ground site is known. Also budget for battery cable and lugs, an AC breaker panel and grounding.
Growing it: the SPF parallels up to six units, and two give split-phase 120/240 V for a well pump or a dryer; add ALP battery modules for more overnight capacity, and a generator on the AC input for winter. If the house has 240 V loads from the start, look at the 6 kW split-phase system. Specifications are from Growatt's datasheet and are for reference; the installation must follow the manual, the NEC and local code, be carried out by a licensed electrician.
6 components, and one thing that isn't here
Each one is a product we sell on its own, so you can read its full listing, and replace or add to it later.
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Growatt 3.5KW Single Phase Off-Grid Solar Inverter
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JA Solar JAM54D41 LB 450W | N-Type Double Glass Bifacial Solar Panel | Black Module (0.42$/W)
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ROCKSOLAR PV Cables One Pair Red+Black for Off Grid Solar Systems
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MidNite - DC Breaker 15-63A 300 Vdc
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MidNite Solar - MNBIGBABY DC Breaker Box
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Growatt ALP LV-US 5kWh 48V LiFePO4 Battery
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Rails, roof hooks, ground-mount posts and clamps depend on the roof or ground they go on, so no system ships with them. They are sold separately, and the finder adds the right pack for your surface when it sizes a system.
Published before you buy. No email required.
The wiring diagram and the commissioning record are drawn from this system's own figures.
- User manualInstallation, operation and settings, from the box.Download PDF →
- DatasheetThe manufacturer's ratings, limits and certifications.Download PDF →
- Wiring diagramSingle-line diagram: array, inverter, battery, disconnects and grounding.View and print →
- Commissioning recordThe checks and readings to take before the system goes live.View and print →
The wiring diagram and commissioning record are for customer reference only. They are not a stamped design. Installation, grounding and any grid connection must be carried out by a licensed electrician, and a professional engineer's review is required where your jurisdiction calls for one.
Every number, by component.
The figures the manufacturer publishes. The datasheet above is the reference if the two ever differ.
| Growatt ALP 5.0L-C1 5kW Battery | Details |
|---|---|
| Model | Growatt ALP 5.0L-C1 |
| Energy Capacity | 5.0kWh |
| Max Charge/Discharge Power | 3kW |
| Max Charge/Discharge Current | 60A |
| Dimensions | 650 x 350 x 165mm (W x D x H) |
| Weight | 42kg |
| Nominal Voltage | 51.2V |
| Warranty | 10 years |
| Battery Type | Cobalt Free Lithium Iron Phosphate (LFP) |
| Operating Voltage Range | 48 - 57.6V |
| Installation | Floor installation |
| Operation Temperature | 0°C-50°C/32-122°F |
| DoD | 92% 6000 cycles |
| Parallel Capability | Multi-cluster ALP battery system in parallel, Max. 8 clusters (Max. 400kWh) |
| Communication Port | CAN/RS485 |
| Performance Warranty | 10 years |
| Certification | CE, ROHS, UL1973+FCC, UN38.3 + IP65 |
| Growatt Off-Grid Storage Inverter SPF 3000~3500TL LVM-US | Details |
|---|---|
| Battery Voltage | 48VDC |
| Battery Type | Lithium/Lead-acid |
| Inverter Output | Rated Power: 3500VA 3500W Parallel Capability: Yes, 6 units maximum AC Voltage Regulation (Battery Mode): 100Vac/110Vac/120Vac @ 50/60Hz Surge Power: 6000VA Efficiency (Peak): 90% Waveform: Pure Sine Wave Transfer Time: 10ms typical, 20ms max |
| Solar Charger | Maximum PV Array Power: 4000W MPPT Range @ Operating Voltage: 120VDC – 225VDC Maximum PV Array Open Circuit Voltage: 280VDC Maximum Solar Charge Current: 80A |
| AC Charger | Charge Current: 40A AC Input Voltage: 120VAC Selectable Voltage Range: 95-140VAC (For Personal Computers); 65-140VAC (For Home Appliances) Frequency Range: 50Hz/60Hz (Auto sensing) |
| Physical | Protection Degree: IP20/NEMA Type1 Dimension (W/H/D): 330/485/135mm Net Weight: 12kg |
| Operating Environment | Humidity: 5% to 95% Relative Humidity (Non-condensing) Operating Temperature: 0°C - 50°C (32°F - 122°F) Storage Temperature: -15°C - 60°C (-5°F - 140°F) |
| Warranty | 2 Years |
| JA Solar JAM54D41 LB 450W N-Type Double Glass Bifacial Solar Panel | Details |
|---|---|
| Rated Power (as supplied) | 450W |
| Brand | JA Solar |
| Model | JAM54D41 LB |
| Power Output Range | 430W – 455W |
| Cell Technology | N-Type Bycium+ Mono-Crystalline |
| Module Type | Double Glass Bifacial Half-Cell (16BB) |
| Number of Cells | 108 (6 × 18) |
| Maximum Module Efficiency | Up to 22.5% |
| Bifaciality Ratio | Approx. 80% |
| Power Tolerance | 0 ~ +3% |
| Module Dimensions | 1762 × 1134 × 30 mm |
| Module Weight | 22 kg |
| Front Glass | 1.6 mm Heat-Strengthened Glass |
| Rear Glass | 1.6 mm Heat-Strengthened Glass |
| Frame | Anodized Aluminum Alloy (Black, 30 mm) |
| Junction Box | IP68 Rated with MC4-EVO2 Connectors |
| Maximum System Voltage | 1500 V DC |
| Maximum Series Fuse | 30 A |
| Operating Temperature | −40°C to +85°C |
| Temperature Coefficient (Pmax) | −0.29% / °C |
| Mechanical Load (Front) | 5400 Pa |
| Mechanical Load (Rear) | 2400 Pa |
| Product Warranty | 12 Years |
| Performance Warranty | 30-Year Linear Power Warranty (≤ 0.4% annual degradation) |
| Country of Origin | China |
Before you order.
If yours isn't here, ask an engineer. It costs nothing and it's the step most people skip.
Is the racking or mounting hardware included?
No. Rails, roof hooks, ground-mount posts and clamps depend on the roof or ground they go on, so no system ships with them. They are sold separately. The finder adds the right pack for your surface when it sizes a system, or ask us and we will match one to your roof.
Can I install it myself?
The equipment ships ready to connect, but the AC side, the grounding and any connection to the grid must be done by a licensed electrician. A grid-tied or hybrid system also needs a permit and your utility's interconnection approval before it is switched on. The wiring diagram and commissioning record we publish are for reference; they are not a stamped design, and a professional engineer's review is required where your jurisdiction calls for one.
Are the solar panels included?
Where the title names an array — “7.04 kW panels”, say — the panels are in the box and appear under What ships. A backup system whose title names no array, such as the Growatt whole-home and partial-home backup systems, is the inverter and battery only, and its listing says so. Panels for those are sold separately.
What is the difference between off-grid, grid-tie and hybrid?
An off-grid system has no utility connection: the battery carries the night and the generator input carries the dark days. A grid-tie system has no battery: it feeds your panel and the grid by day and goes dark in an outage. A hybrid system does both — it works with the grid and keeps a battery, and with its transfer switch it carries your essential circuits through an outage.
Which tax credits and incentives apply?
The 30% federal residential credit ended on 31 December 2025, and nothing on this page assumes it. Some states still run their own credits, sales-tax exemptions or generation payments; the savings estimate above lists the ones we know of for your state, and our tax credit guide explains what applies in 2026.
Can I charge from a generator?
Most off-grid inverters in the range have a generator input for charging on dark days; the specification table says whether this one does and at what current. A grid-tie inverter has no generator input. A hybrid system takes a generator through its transfer switch, if your electrician wires one in.
What if I'm not sure this is the right product?
Ask before you order. Send us what you need to run, or your pool or well figures, and an engineer will confirm the choice — it costs nothing. Or use the finder below, which sizes from what you actually run and shows its reasoning.
