Battery back-up and solar storage systems

Battery backup and solar storage systems for PV installations make it possible to store any surplus solar energy produced during the day. Solar technology allows you to make use of the stored energy whenever there’s a demand for power – day or night, rain or shine.

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Battery back-up and solar storage systems

Solar panel battery storage

Battery storage for your solar panels will help reduce your electricity costs further. And if you find that you generate more energy than you can use and store, you can still sell the surplus back to the grid. Another perk is that your home is protected from power outages since your battery system will continue to supply your property and also keep your solar panels working as normal.

A solar battery storage system is a great addition to your solar installation, helping you make the most of the power you produce. You can monitor, optimise and precisely manage how you use the electricity generated by your PV system.

Our solar battery storage and backup systems comprise SMA or Fronius battery controllers together with Lead Acid or Lithium-ion deep cycle, long-life batteries that come with a 10-year warranty. Whether you’re considering getting a battery backup system to protect your home from a power cut, or you’re looking for a full off-grid solution, the designers and engineers at Geo Green Power will find you the perfect solar battery system for your requirements and budget.

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What is the useable capacity of a battery?

The capacity is the amount of energy in kWh, or units, that the battery can store. However, the batteries should never be drained completely as this can damage the cells. ‘Useable’ capacity is an important figure to note when researching batteries, although sometimes brands will quote a ‘total’ capacity which is misleading.

What is a cycle?

A cycle is one full discharge and one complete charge of the battery, although the battery may only discharge 25% and then recharge 25%, which would account for a quarter of a cycle. When it comes to the warranty of a battery, you need to know how many cycles the battery is warranted for so you can calculate the number of kWhs, or units of electricity, that the battery is intended to deliver over its warrantied lifespan.

What capacity should I look for in a solar battery?

Each customer’s needs are different, so it depends on your individual requirements as to the capacity size you should look for. If you want to install EV chargers, you’ll need a larger battery to allow for this. Likewise, if you plan on grid trading, a larger battery capacity will allow for more charging at a cheaper rate and a greater quantity of power to sell back to the grid.

For some people, the decision to install energy storage is to become more sustainable, not for financial benefits. Solar battery storage can enable properties to become less dependent on grid electricity suppliers and reduce their overall carbon footprint. In these instances, the capacity requirements may be different again.

Contact us to discuss your requirements and we’ll be happy to advise you on the options available.

Solar Power, Day or Night

You may wonder whether solar panels work at night.  The short answer is no, but battery storage can enable you to use solar energy at any time. During the day, your solar panels may generate more power than you’ll need for your property. With solar battery storage, you’ll be able to use that excess energy later when the panels are no longer providing power, helping you to avoid using power from the grid.

AC Coupling versus DC Coupling

When you purchase a solar battery, there’s the option of AC coupling or DC coupling – each has its own pros and cons to bear in mind before you make your decision.

AC coupled requires separate inverters for the battery and panels. This allows for flexibility in terms of location and enables you to optimise the position of your equipment – batteries operate best at room temperature while inverters work best at cooler temperatures. You’ll get more power from the combination of the battery and panel inverters, and they work well with any solar PV system. However, they can be more expensive and are often between 1-3% less efficient in terms of power transfer than DC.

DC coupled battery and panels share the same inverter, which provides a more efficient power transfer than AC by up to 3% and could be cheaper overall. However, if there’s a fault with the inverter, it could render the battery useless since a compatible inverter might not be available, and there’s limited access to power. There’s also less flexibility with where these battery units can be installed.


Tesla Powerwall 2
  • 6.6kW PV inverter
  • 13.5kWh integrated battery
  • 10 year warranty
PS II AC Connected package
  • 5kWh/10kWh
  • 10 year warranty
PS II DC Connected Hybrid
  • 5kWh-24hWh capacity
  • 10 year warranty
Sunny Island
  • 6kW to 8kW battery controller
  • Supports a wide range of applications
  • 5 year warranty
  • Batteries sold separately
Symo Hybrid 3kW / 4kW / 5kW
  • 5-8kW PV inverter
  • Up to 12kWh battery storage can be connected
  • 5 year warranty
Solar Battery
  • 4.5kWh-12kWh capacity
  • 10 year warranty
Victron Energy Systems

Victron Energy are known for their technical innovation, reliability, and build quality. Our renewable energy experts are equipped with a wealth of knowledge on their products, allowing them to tailor an application to your needs.

Self Consumption (SC) vs Back-Up (BU) vs Self Consumption and Back-Up (SCBU)

Self Consumption (SC)

An SC solution comprises of solar panels, batteries and an inverter which will feed around 40% of your electricity load from solar panels. This solution could reduce your monthly electricity bill.

Back-Up (BU)

A BU solution comprises of an inverter and batteries installed on your property db board. This solution will mean you remain with power in the event of a power outage or load shedding. This uses battery power so will need charging once it has run out. This solution will give you between 6-7 hours of electricity.

Some battery systems can be Self-Consumption (SC), Back-Up (BU) or Self-Consumption and Back-Up (SCBU). The list to the right highlights this.

Tesla Powerwall 2 - SC/SCBU

Puredrive Energy's Battery Storage System - SC/SCBU

PureStorage II DC Hybrid - SC/SCBU

Sunny Island - SC/SCBU

Symo Hybrid 3kW/4kW/5kW - SC/SCBU

Vitron Energy Systems - Off Grid Battery Systems - SC/SCBU

Contact Us

Why not get in touch to discuss a bespoke solar battery storage system that will match your requirements exactly? From small domestic solar battery storage units that will help you increase your solar power consumption to 250kWh UPS systems to keep your manufacturing facility running in the event of a power outage, we can design and install the right system for your needs.

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