7.3kW Off-Grid Residential Solar Power System (Base Kit 3)
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7.3kW Off-Grid Solar Power System (Base Kit 3)
This off-grid solar power system kit provides nearly everything you need to bring 7.3kW of off-grid solar power and battery storage to a home, large cabin, or any other remote location. Choose your preferred battery type and solar panel mounting option, and you're on your way!
This 7.3kW Off-Grid Solar Power System Includes:
- 24x Seraphim 305W monocrystalline solar PV modules (or similar)
- 1x pre-wired OutBack FLEXpower TWO VFXR dual inverter system with 2x OutBack FLEXmax 80 MPPT Charge Controllers
- 2x 100' MC4 connector cables
- 4x 50' MC4 connector cables
- 2x 30' MC4 connector cables
- 1x MC4 connector cable disconnect key
- 1x OutBack FLEXware PV12 Combiner Box
- 8x ½" strain relief - 2 round holes/locknuts
- 8x 20-amp, 150VDC din rail mount breakers
- 1x surge protection device - 300VDC
- 1x pair of 10' long 4/0 battery-to-inverter cables
The heart of this system is an OutBack FLEXpower TWO pre-wired dual inverter system rated at 7200 continuous Watts. Featuring two of OutBack's vented VFXR3648A pure sine wave inverters and two of OutBack's FLEXmax 80 MPPT charge controllers wired together in a single unit that can be wall-mounted either horizontally or vertically, the FLEXpower TWO delivers 120/240VAC output at 50Hz or 60Hz (selectable).
Is This the Right Off-Grid Solar Power System for Me?
The answer starts with knowing how much power you need on a daily basis in kilowatt-hours (our load calculator can help with this; divide the number it gives you in Watt-hours by 1000 to get kilowatt-hours, or kWh).
Compare your daily kWh needs to the map here, which shows the amount of daily kWh this system's solar panels will produce if installed at an optimal tilt during the time of year when there's the least amount of sun. If your needs exceed the solar potential shown for your area on the map, check out our larger off-grid solar power system kits or call us at 800-919-2400.
If this 7.3 kW Off-Grid Residential Solar Power System is appropriately sized for your needs, then it's time to consider which battery storage and solar panel mounting options you want to use with it. The tables below compare each of these options.
Battery Bank Options for This 7.3kW Off-Grid Solar Power System:
Battery Type Trojan L-16-RE-2V Premium Flooded Lead Acid Battery 
Outback EnergyCell 1300RE
48V Battery Bank
KiloVault Lithium Battery 
# of Batteries in Kit
(Necessary cables, access also included)(24) Trojan L-16-RE-2V Flooded Lead Acid Batteries (24) Outback 1300RE
48V Racked Battery Bank(8) KiloVault 3.6kWh Lithium Batteries Maintenance (Watering) Yes No No Maximum Recommended Depth of Discharge (DoD) 50% 50% 80% # Cycles at Max Recommended DoD 1600 1800 5000 Battery Voltage 2V 48V 12V Battery Amp-Hours (C/20 Charge Rate) 1110 Ah 1148 Ah 300 Ah Battery Watt-Hours (C/20 Charge Rate) 2220 Wh 55,104 Wh 3600 Wh Total Battery Bank Capacity (C/20) 53.3 kWh 55.1 kWh 28.8 kWh Maximum Useable Capacity
at Max DoD26.65 kWh 27.5 kWh 23.04 kWh Average Price Per Battery $433.71 $679.35 $2538.70 Average Cost/kWh Cycle* $.19 $.33 $.18 Average Lifespan 7 years 8 Years 13 Years Operating Temperature Range -20° to 45°C -23° to 60°C 0° to 45°C Weight per Battery 118 lbs 180 lbs 85 lbs Warranty 2 Years 2 Years 3 Years Country of Origin USA China China Pros Smart Carbon technology for 15% improved cycle life.
Least expensive option up front.Nano Carbon technology improves charge/discharge.
Avg cost up front.
Maintenance Free.Maintenance-free.
Modular and lightweight.
Safe, non-toxic,
environmentally benign.
No cooling or ventilation needed.
Lowest lifetime cost.Cons Maintenance required (watering).
Replacement costs (~4X over life of solar system).
Requires ventilation due to off-gassing.
Limited to 4 strings in parallel.Replacement costs (~4X over life of solar system). Highest up front cost. *Average Cost/kWh Cycle = (Avg Price Battery/(# Cycles x DoD X Wh)) x 1000
Solar Panel Mounting Options for This 7.3kW Off-Grid Solar Power System:
Mounting Type Roof Mount Option 
Ground Mount Option 
Top of Pole Mount Option 
Kit Includes IronRidge XR1000 14' Rails, clamps, and flashing IronRidge XR1000 14' Rails, clamps, and caps/connectors 2x MT Solar 12 Module Mount with crank and hoist, IronRidge XR1000 14' Rails, clamps, and combiner box Weight Tolerance Up to 70 PSF Up to 90 PSF Up to 50 PSF Documents
Solar Panel Specs
- 64.57" H x 39.06" W x 1.58" D
- 38.5 lbs
- 60 monocrystalline PERC cells
- Peak efficiency: 18.75%
- Nominal power: 305W
- Tolerance: +0-4.99W
- Nominal voltage: 20V
- Open circuit voltage: 39.9V
- Short circuit current: 9.76A
- Maximum system voltage: 1000V
- Connectors: MC4 compatible
- Manufacturer: Seraphim
- Model number: SEG-6MB-305BB
The exact solar panels used in your kit may depend on what's available to us and what's best suited to your needs.
Pre-Wired Dual Inverter System Specs
- 46.5" W x 20.25" H x 13" D
- 256 lbs
- Input (battery) voltage: 42 - 68VDC
- Continuous power: 7200W
- Surge rating (5 sec): 10,800W
- Output voltage: 120/240VAC
- Output frequency: 50/60 Hz
- Peak efficiency: 93%
- Max battery charging output: 160A
- Manufacturer: OutBack Power
- Model number: FP2 VFXR3648A-01
