+49 (0) 7554 9896935

+44 (0) 333 444 7655

0 item - £0.00
Practical off-grid system - 3kW PV & 20kW battery bank

Be the first to review this product

Excl. Tax: £9,707.00 Incl. Tax: £11,551.33

Availability: In stock

  • Inverter Continuous Output (Surge): 3 (5.7) kW
  • Battery Capacity (C10/C20/C100): 18 / 22 / 29 kWh
  • Compatible Backup Power Source: Grid or Generator

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

  • 3kW solar array using 12x Axitec 245w panels
  • OutBack Power FLEXpower ONE
  • 8x Rolls 4000 S605 6V batteries
  • Additional switchgear
  • NH1 Fusebox Jean Mueller
  • NH1 Fuse 250a
  • 1 meter 95mm battery cable
  • 100m PV cable 6mm
  • Outback PV combiner BOX
  • Combiner BOX MCB
  • 7 x Interconnectors for batteries

Ideal for locations where grid connection is unfeasible due to expense, location or logistical reasons. Capable of delivering a continuous output of 3kW (or a peak output of 5.7kW); this system is well suited to powering a house or business with low/modest power requirements. No generator is included in this pricing.

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 their 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.

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 the Outback VFX3048E inverter at its maximum continuous output (3000w), you will discharge the battery bank to 50% (not recommended to go lower) in 2.5 hours and receive 7.56kWh. Usage in this way would is not recommened except for short periods. 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 down to 50% Depth of Discharge (DoD).

If you draw 288 watts per hour, you will have 50 hours of power at this rate (C100) and your total power will be 14.4kWh.
If you draw 515 watts per hour, you will have 25 hours of power at this rate (C50) and your total power will be 12.9kWh.
If you draw 1080 watts per hour, you will have 10 hours of power at this rate (C20) and your total power will be 10.8kWh.
If you draw 1838 watts per hour, you will have 5 hours of power at this rate (C10) and your total power will be 9.2kWh.

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 an inverter with a 3000w continuous rating will allow you to run heavy appliances if necessary.

Having discharged your battery bank completely, and if the sky is still overcast, a generator or the grid can act as a standy reserve of emergency power. The VFX3048E can 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 45A. 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.

Rolls 4000 series batteries have a 7 year warranty. At 20% DoD you will have 2000 cycles, at 50% you will have 1280 cycles. Therefore if you discharged it to 50% every day, 365 days a year you will still have 3.8 years of estimated use. Since this is an extremely unlikely consumption pattern (due to summer), average life expectancy for Rolls 4000 batteries is 10 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.

Main Components
CSUN 245w panels
OutBack Power FLEXpower ONE
Rolls 4000 S600

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) 1500
Manufacturer Off-Grid Europe
Delivery Time Europe (Est) 4 weeks
System DC Voltage 48
Solar Array Wattage 3000
Backup Autostart Generator, Manual Generator, Grid, None
Battery Capacity Wh C20 21600
Phases Single Phase
Control Gear Brand Outback Power
Inverter Continuous Wattage 3000
Battery Type Flooded Lead-Acid

Write Your Own Review

You're reviewing: Practical off-grid system - 3kW PV & 20kW battery bank