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Outback off-grid system - 6kW PV & 65kW battery bank

  • Dual Inverter Continuous Output (Surge): 6 (11.4) kW
  • Battery Capacity (C10/C20/C100): 54 / 65 / 91 kWh
  • Compatible Backup Power Source: Grid or Generator
Excl. Tax: £21,291.60 Incl. Tax: £25,337.00

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Excl. Tax: £21,291.60 Incl. Tax: £25,337.00

Fully specified solar PV 48v off-grid system with:

  • 6kW solar array
  • OutBack Power FLEXpower TWO
  • 2x OutBack Power FM60 Charge Controllers
  • 1x 48V Battery Bank
  • Additional switchgear

Ideal for locations where grid connection is unfeasible due to expense, location or logistical reasons. Capable of delivering a continuous output of 6kW (or a peak output of 11.4kW); this system is well suited to powering a house or business with modest power requirements. No generator is included in this pricing.

Design
The difficulty with off-grid systems is that they can be complicated to design. In order to alleviate this challenge we've done all of the work for you. Not only have all the major components been specifically chosen for the compatibility with one another, but all of the more minor elements have been carefully selected according to their specifications.

This means that the panels are of the highest quality, and configured to utilise the charge controller as fully as possible. The charge controller itself is chosen to draw every last ounce of power from the panels, and also dovetails perfectly with the inverter/charger in order to give the best treatment to the all important battery bank. All of the cables have been selected so that they can safely handle the maximum current running through them with minimal losses, whilst remaining as cost effective and flexible as possible.

Output
Before going any further, we urge you to read this section on planning your system and our full tutorial section in the top left.

Predicting solar array output depends on a few variables, please contact us with your location so that we can provide you with estimates.

Battery bank capacity depends on the amount of current you draw. The faster you discharge a battery bank, the lower the overall capacity for that cycle. If you use both Outback VFX3048E inverters at their maximum continuous output (6000w), you will discharge the battery bank to 50% (not recommended to go lower) in 4.5 hours and receive approximately 23.9kWh. Usage in this way would make sense in places with much sunlight, or as an emergency power source. Otherwise you could go easier on the bank. The total amount of power in this case would depend on your consumption profile. Below are some examples based on C (discharge) rates.

If you draw 913 watts per hour, you will have 50 hours of power at this rate (C100) and your total power will be 45.7kWh. If you consume at this rate for 10 hours a day, you will have 5 days of battery power.
If you draw 1595 watts per hour, you will have 25 hours of power at this rate (C50) and your total power will be 39.9kWh. If you consume at this rate for 10 hours a day, you will have 2.5 days of battery power.
If you draw 3240 watts per hour, you will have 10 hours of power at this rate (C20) and your total power will be 32.4kWh. If you consume at this rate for 10 hours a day, you will have 1 day of battery power.

Knowing how you will consume energy is an important calculation in sizing the system to your needs. It is unlikely that your consumption will be as straightforward as above. You will have surges and lows so it is never an exact science. Having two inverters with a 6000w continuous rating will allow you to run heavy appliances and tools if necessary.

Having discharged your battery bank completely, and if the sky is still overcast, the generator acts as a standy reserve of emergency power. The VFX3048E will start it automatically, and use it to recharge the battery bank to 100%. It is limited by the the amount of DC charge this unit can put out which is 90A. You will also have to perform an equalisation (maintenance) charge every few months to make sure you are fully recharging the cells and keeping them in line.

Lifetime
The most important part of an off-grid PV storage system is the battery bank. Treating it correctly will prevent you from needing to replace the most important component prematurely. Batteries have cycle ratings based on the typical depth of discharge. If you only consume 20% of the battery banks power before recharging it daily, your battery bank will last much longer than if you discharge it to 50% daily. You are most likely to go down to the 50% rating during overcast conditions (winter) so this is where you reduce the lifetime.

Rolls 5000 series batteries are amongst the best you can buy for this application, their 10 year warranty backs that up. At 20% DoD you will have 5000 cycles, at 50% you will have 3200 cycles. Therefore if you discharged it to 50% every day, 365 days a year you will still have 8.7 years of estimated use. Since this is an extremely unlikely consumption pattern (due to summer), average life expectancy for Rolls batteries is 15 years. Do not take this figure for granted as there are things that could go wrong. Battery maintenance is an essential consideration. Will someone be able to monitor and react to your battery bank's condition? Heat is a killer, so make sure you have thought about where you will put your batteries.

Additional Components

100m Solar Cable
Outback FLEXware PV-8 combiner box with fuses
70mm2 Battery wiring
NH1 Fuse box with fuses

This is a demonstration model only. Please call us on 0333 444 7655 for your bespoke system

Weight (KG) 2000.0000
Manufacturer Off-Grid Europe
Delivery Time Europe (Est) 4 weeks
System DC Voltage 48
Solar Array Wattage 6,000.00
Backup Autostart Generator, Manual Generator, Grid, None
Battery Capacity Wh C20 64,800.00
Phases Single Phase
Control Gear Brand Outback Power
Inverter Continuous Wattage 6,000.00
Battery Type Flooded Lead-Acid