Battery Back-up

Battery back-up for Grid Solar Power


My Grid battery back up options

My Grid battery back up options

1. What is a hybrid solar power system?

Have guaranteed electricity supply from the grid, with stored excess solar power available for use at night.   Use your own stored power if the grid goes down, or at any time you like.   Hybrid solar power systems cost less than half the price of a totally off-grid system, and don’t require generator back up.    The benefits of battery storage are being recognised by an increasing number of people.


2. What are the benefits of  “battery back-up”?

  •  use solar energy for your day time power, charge batteries for use at night, and still sell any excess power.
  •  buy only the cheapest grid power –  optimise the value of grid-supplied mains electricity.
  •  Improve sub-standard, or low voltage mains electricity supply.
  •  avoid buying electricity at the highest tariff rates.
  •  avoid peak-usage charges, by using stored cheap power.
  •  have reliable,  continuous power at any time, even when the grid is not operating
  •  overcome utility-imposed solar system size restrictions, by storing your unused power, and limiting the power exported to the grid.


3. Why consider buying a hybrid solar system?

1) Keep the electricity flowing if the grid goes down

Most solar power systems shut down if they detect failure of the grid.   This is a safety requirement to protect workers making repairs to wires outside your home.    A hybrid solar system also safely disconnects your house from the grid in the event of a power outage, but runs your house from the batteries.    Imagine, yours is the only house in the street with lights on, the TV going, and the fridge keeping the beers cold.

2) Overcome solar system ‘size limits’ imposed by the electricity network

More electricity networks are tightening restrictions on maximum allowable solar system sizes.     This often results in home owners being restricted to a solar system much smaller than they need to offset their bills.    Hybrid solar systems get around this limitation by using a smart inverter that works with your battery bank.     These inverters can be configured to have a restricted export that complies, but allows your system to produce much more under full sunlight conditions.    So, to the grid a 10kW  installed solar power system could look like a  2kW system.    Whilst only 2kW is exported to the grid, the other 8kW is either used on site, or delivered to the batteries for later use.

3) Get around low feed-in tariffs

Why accept just 5 cents for solar power exported, and then buy it back at five times the price, just hours later?    With a hybrid solar power system,  your inverter charges batteries with any surplus solar power, to be used at night, so you get ‘free’ electricity then, instead of paying for it.

4) Benefit from cheap off-peak electricity

Time of use’ tariffs are available in some places – this means that grid electricity costs more during periods of peak demand.   With a hybrid solar power system, you can use stored battery power when prices are high, rather than buying power.    And if your batteries need a little top up during winter because of low sunlight for a few days, just charge them using cheap off peak tariffs.


4. Is it worth the extra cost?

This depends on how much electricity you use, and whether it’s used during the day or when the sun is not shining.   Working households tend to use most power in the evenings, rather than during the day.   In this case, a hybrid solar power system can pay itself off faster than a normal grid solar power system, despite the extra initial expense, especially if it is financed cheaply (e.g. using lazy funds in the bank, or adding to your mortgage).

It feels good using your own solar electricity at night, instead of buying from the grid, at peak rates.    Especially as you’re avoiding selling it during the day for a pittance!   Payback calculations can be quite involved.    If you know your typical power usage, we can show you which options will give better returns.


 Goodwe 5kw Hybrid solar power system.

5kw Grid inverter that automatically charges 48v batteries, and then preferentially uses the battery power at night.

Goodwe-ES inverter

Goodwe-ES inverter

Saves you buying electricity from the grid at night.   No more power outages.

Solar input can be up to 5,5kw, and the power exported to the grid can be preset from zero to 4.6kw.

Stand-by loads cannot exceed 4.8kw, so in most cases the switched loads will be separated from the grid-only loads in the switchboard.


Contact Solazone to find out how the system can be set up to work best for you.

Goodwe installation

Goodwe installation in Philippines


Our basic standard package starts from $5950, and includes everything you need; just add a solar panel kit, or replace your existing grid inverter.  You will enjoy reliable battery backed-up solar power.

  • Goodwe ES 5kw solar hybrid / battery inverter
  • 4.8 kwh Tubular plate silicone gel batteries
  • Battery cabinet and safety fuses
  • Battery cables (2.5m)
  • Pair of DC isolators.

* System must be installed by a qualified electrician with solar / battery accreditation.

Goodwe ES Specifications



Battery back-up for existing solar power systems.

Economic and reliable, this battery pack controller converts any existing single phase solar system to a battery back-up system.

Use your solar power at night, and also use the batteries during high peak loads during the day.Program it to operate in the most economical mode

Program the most economical mode for your power usage type.

We normally suggest 10kwh batteries, but you can start with a smaller battery pack, and add more batteries later, if you want.

Run lights, TV, fridge and other normal loads at night from your own stored solar power.



Solazone Goodwe-BP battery controller.

Our basic standard package starts from $3950, and includes everything you need.

  • Goodwe BP 2.5kw battery controller
  • 4.8 kwh Tubular plate silicone gel batteries
  • Battery cabinet and safety fuses
  • Battery cables (2.5m)
  • Pair of DC isolators.

* System must be installed by a qualified electrician with solar / battery accreditation.

Goodwe BP Specifications


Selectronic SP Pro –  the Australian-made solution.

Very smart Selectronic SP Pro, Australian designed and made inverter-charger, offers sophisticated solar with grid control, and the security of battery backup.

SP PRO GO inverters

This means your solar power still works during a grid failure, you are never affected by black-outs, and you can control the amounts and times of feed-in to and purchase from the grid.

This independent control of supply, means you control the cost of grid supply, using your battery power during premium charge periods, and either recharging your batteries from off-peak grid, or from the sun.

Both single phase and 3 phase solar power can be backed up using this method.  Sizes range from 3kw to 100kw.

The diagram below illustrates a single-phase solar-powered building system, with battery back-up using ac coupling, and a single inverter.

Additional grid inverters and solar panels may be added at any time.  The feed to the grid can be controlled and limited, which permits you to install any size solar system you want, and not be dictated to by the power company.

This back-up system is extremely flexible, and can be added to virtually any existing grid-connected solar power setup.

Diagram of SP Pro connections

Selectronic Sp Pro wiring diagram

Get the details here:


 Latronics Independent Solar solution – independence from the grid!

Easily add a separate battery solar system to run any part of your house independently, with a Latronics Sine Wave inverter.

You can easily connect wind generators, too.

Latronics range of reliable back-up inverters

Latronics range of reliable sine wave battery inverters

Latronics also has a unique system, used in many grid solar installations whereby the grid inverter operates on low voltage dc, allowing the simple installation of 48v or 96v battery bank, and a stand-by inverter that automatically takes over to power the load, if the grid fails.

Existing Latronics PV Edge grid inverter

If you have an existing Latronics PV Edge grid inverter

As the batteries can always accept charge from the solar panels, the house load has the benefit of automatically using the solar-generated power, even during times of a power black-out.

Wiring schematic for the Latronics grid back-up solar / wind power system

Wiring schematic for the Latronics grid back-up solar / wind power system

An additional advantage of this system is that dc wind generators or water turbines can be easily added to the grid-feed electricity system.

Solazone can supply the Latronics back-up inverters with automatic change-over switches included, so there is seamless transfer of power, and simplified ac wiring that is not confusing.  The diagram above shows a basic outline of this type of system.

Get more details here:


 SMA Solutions

Most people know that their solar power disconnects from the grid in case of a blackout.

In this case it does not produce any more electricity – neither for grid feeding nor for the supply of the house.

This can be fixed in several ways:

Tesla powerwall with SMA inverter instalation

Tesla powerwall with SMA inverter instalation

SMA Technologie AG closes this gap with the Sunny Backup-System:   As an add-on for the PV-system it automatically switches the system to island power supply in the case of a grid failure.

SMA battery back-up solution.

SMA battery back-up solution.

Get more details here:



I want to buy a reliable battery back-up solar system.