Solar Battery » Smart Optimisation and Operation Modes
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Smart Optimisation and Operation Modes

Here you can find all the information about how Moixa's software is used to optimise energy storage and how you can set a schedule for your battery

Time-of-Use tariff explained

What is a time-of-use tariff?

A time-of-use tariff is an electricity tariff where energy suppliers offer different prices at different times of the day. The price differences usually correspond to when there is more or less demand for electricity often referred to as peak (when lots of people are using electricity) or off-peak periods (when fewer people require electricity such as overnight).

Traditionally, time-of-use tariffs were day-night, static tariffs such as Economy 7. There are also newer tariffs available which have been facilitated by the introduction of smart meters and these can have different prices throughout the day. 

The different tariff types available tend to fall into three categories:

Flat Rate Tariff
This is a tariff which remains the same price per unit of energy throughout the day and is the same every day.

Static Time-of-Use Tariff
This is a tariff with different price periods during the day, but these different price periods are the same every day.

Dynamic Time-of-Use Tariff
This is a tariff which has different price periods throughout the day and these periods change every day. One example of a tariff like this is the Agile Octopus tariff by Octopus Energy.

 

If you have submitted your tariff information to Moixa support you will be able to see your tariff information on the Moixa Dashboard. Your export tariff data will only be shown if you are on an export tariff that we can optimise for. If your tariff data shown is incorrect please contact support to amend this.”


The planned actions list will show any upcoming instructions for your battery for the next 48 hours. These planned actions will be shown on your Dashboard graphs as a vertical dotted line, you can hover over the dotted line for more info.

There are four different instructions your battery can follow:

  • Charge
    The battery charges at the rate shown up to the target state of charge (this may mean that the battery charges from grid)
  • Discharge
    The battery discharges at the rate shown down to the target state of charge, please note, discharge intents are only possible when in Smart operation mode.
  • Balance
    The battery will charge when excess solar generation is available and discharge when there is household demand whilst staying within the state of charge range
  • Idle
    The battery does not charge or discharge unless the state of charge is outside the stated range.

The state of charge range shows the minimum and maximum charge your battery should have during balance or idle mode. The lower state of charge can differ from your actual minimum to allow the battery to operate with balance or idle behaviour whilst reserving some charge for high-tariff periods.

If you’re on an automatic charging plan, these charging instructions will be different every day as a new charging plan is generated at each planning event. A planning event takes place every night, typically at 10 pm (UTC). If you’re on a dynamic tariff, it can also happen if the software needs to re-plan because the amount of charge in your battery has deviated too far from the predicted level. Your future charging instructions may change at the next planning event.

If you’re on a scheduled plan, you will be able to see the time, rate, and target state of charge. If you have a scheduled plan set by the support team for a V3/V3C battery, then you may see a minute-long idle instruction in your charging plan; this is to reset the inverter.

If you are on a flat tariff or have not provided your tariff details, your battery should always be in balance with the state of charge range being your battery’s minimum state of charge (usually 10% for 4.8 kWh and larger or 20% for V3/V3C batteries). On a flat tariff, this is the most optimal behaviour for you as you do not have any low-tariff periods that you could charge from on poor solar generation days. 

Your Moixa smart battery can be optimised differently depending on your model of battery and your specific energy tariff.

Our V3 and V3C model batteries can support Balance or Scheduled mode.

Our V4, 7.2 and 9.6 product systems support Balance, Scheduled or Smart mode.

Balance mode

When your energy storage system is in Balance mode, the battery will charge when excess solar generation is available and discharge when there is household demand, in order to maximise use of your self-generated solar energy.

If you are on a flat tariff, this will be the best operation mode for you, as you do not have any low-tariff periods that you could charge from on poor solar generation days. 

This operation mode is also helpful if you plan to be away from home for a certain period (e.g. if you go on holiday) and know that your household consumption will be significantly reduced. By choosing this mode, you can prevent your battery from charging from the grid while you are away.

Scheduled mode

With Scheduled mode, you will be able to control when your battery charges by creating a personalised charging plan and setting up charge and idle instructions (in 30-minute increments) for different days of the week. These instructions will always be repeated weekly and can be repeated for different days of the week. Your battery will follow balance behaviour whilst in Scheduled mode for any periods where you have not added your own charging instruction. 

Scheduled mode could be helpful if your household is not suitable for Smart mode as it does not have predictable and regular consumption habits. 

This mode is especially useful if you are on a static time-of-use tariff because you can set up a specific charging plan to make the most of your tariff and maximise your monetary savings.

Scheduled mode might also be a good option if you would like your battery to work alongside another solar diverting device by only operating at set hours each day, or would like the battery to remain idle at set hours for better compatibility with other devices, such as an EV charger.

If your energy supplier offers any periods of free electricity, such as Octopus’ Power Hour, you will also be able to take advantage of this by charging the battery during this time. If you set an instruction for a one-off event, just remember to remove it from your schedule afterwards, so your battery does not repeat this in subsequent weeks.

Please note that in the event of any deviations from predicted solar or household consumption, the Scheduled mode does not adapt to them, but it will always follow the scheduled plan you have set. The impact of this on your battery’s performance and potential savings is your responsibility.

Smart mode 

When your battery is in Smart mode, its behaviour is optimised by Moixa’s GridShare software. GridShare’s AI relies on three key sources of information to generate your automated personalised daily charging plan.

  • Household Electricity Usage

The battery will look at your recent household electricity consumption to try and predict when you are most likely to require electricity in your household in future.

  • Local Weather Data

Your location, local weather forecast and previous solar generation data are used to predict how much electricity your solar should generate.

  • Your Time-of-Use Tariff

The software looks at your import and export (if applicable) tariffs to understand the cheapest and most expensive times of day for you to purchase energy from the grid.

Based on this data, the software will generate a plan for the battery to cover your predicted household consumption with as much self-generated solar or lower-price grid energy as possible, with the aim of powering your home from the cleanest and lowest-cost energy available.

We strongly recommend that you choose Smart mode if you are on a time-of-use tariff. GridShare is especially beneficial over cloudy days and winter months – when less solar is available. The software will enable you to store energy from the grid when wholesale prices are low, which you can then use at peak times to maximise savings. By storing power when prices are low, you will also be helping to incorporate more renewable energy into the national power system.

Go to the Moixa Dashboard (mygridshare.com), the ‘Battery’ tab and at the bottom of the page you will find the ‘Battery operation mode’. 

You can view the current operation mode and access the operation mode settings.

How to change operating mode

  1. Click ‘Mode settings’ to open the settings and then select the mode you’d like to move to on the grey bar.
  2. The ‘Switch to..’ button in the bottom right corn will be blue to indicate you can switch to this mode. Click it and then confirm you want to switch mode.
  3. If the mode change is successful you’ll receive a confirmation message and notice your ‘Current mode’ update.
  4. Your ‘Upcoming charging plan’ and ‘charging instructions will update as well.
    When moving to Scheduled or Balance this should only take a few seconds but when moving to Smart mode this can take a couple of minutes whilst our software generates a new plan for you.
    a) If the page has been open for a long time you made need to refresh or revisit the page to see the ‘Upcoming charging plan’ or ‘Charging instructions’ update.
    b) If you’re still seeing incorrect information then please flag to support report.
  5. If the mode change has been unsuccessful (e.g. if your battery is offline) this will be flagged by a red error message saying “Sorry! There was an error when making the changes, please try again later”.

Moving in between different operation modes will not affect your predictions whilst in smart mode, these are based on your solar generation and household consumption, not your batteries behaviour. 

Adding instructions

  1. Go to ‘Battery operation mode’, open the ‘Mode settings’ and go to ‘Scheduled’.
  2. Click on the bar for the day of the week you want to add an instruction to and then ‘Add’.
    If you’re planning on adding the same instruction to multiple days you can select any of these days
  3. Select if you want the a ‘charging’ or ‘idle’ instruction, then start and end time, target SoC (for charging) and if you want this instruction repeated on any other days.
    1. A ‘charging’ instruction means the battery will charge at max rate to the target SoC within the start and end times.
    2. A ‘idle’ instruction means the battery will not charge or discharge between the start and end times.

Click confirm to save your instructions.

Editing instructions

  1. Click on the charging instruction or series you’d like to edit on the right.


  2. Make the changes you want to the instruction type (charging or idle), start and end times, and target SoC.
  3. Clicking ‘confirm’ brings up if you want to edit the single charging instruction or the series of charging instructions.
  4. Click confirm to save and the instruction will be updated.

 Deleting instructions

  1. Click on the charging instruction or series you’d like to delete.
  2. Click the bin icon in the top right corner.
  3. Confirm if you’d like to delete the single charging instruction or the series.

Because charging instructions repeat weekly, if you create an instruction you’d only like to use as a one-off you need to delete the instruction afterwards so it’s not repeated on a later week.

Copying a day’s instructions

  1. Click on the bar for the day of the week that you want to copy all the instructions from.
  2. Click the days you’d like to copy the selected days instructions to and confirm.

My Battery charges for a short time just before 10pm before charging again from a lower rate after midnight?

This is an expected behaviour, the software makes it predictions at least every 24 hours, and these are always for the next 48 hours. However with the Agile tariff, the rates are not yet known for the full 48 period, so the software will assume that the current rates will repeat again the next day.

Because the software makes it predictions and sets a new plan typically around 10pm each night, this can sometime result in a short charge just before 10pm when the tariff rates are assumed to be the lowest available, then at 10pm, once the actual tariff is input and new predictions made, any further charging should take place at the very cheapest rate usually after midnight.

My battery does not fully discharge during a peak rate period.

If you are on an Agile tariff, the battery may reserve some power for the very highest rate during the overall peak of 4pm and 7pm. The most expensive rate is not always at the beginning, this can result in the battery not fully discharging straight after 4pm, but reserve power for later on in the peak rate period.

My battery continued to discharge through an off-peak period.

The battery may continue to discharge through a low-rate period rather than charge if it predicts there is sufficient charge available to cover your consumption for the duration as well as high solar predicted for the following day. This may mean that if you unexpectedly turn on a high consumption device at an off peak time, such a charging an EV, the battery may discharge rather than allow the consumption to come entirely from the grid.

To prevent this we would advice using any high consumption devices in a regular pattern or to use the device for shorter periods.

The battery is not charging from excess solar during the day, causing solar to be exported to the grid.

If low solar generation has been predicted and there isn’t excess expected to charge the battery ahead of a peak rate, the battery may stay idle to preserve any charge rather than risk it accidentally being discharged. The battery will retain the correct amount of power to cover the predicted consumption, if it has already reached that level of charge then any additional unexpected solar may be diverted back to the grid.

The battery has not fully charge from grid overnight.

Our software will try and minimise the grid charging and allow room to charge from any predicted free solar energy as much as possible, it will not fully charge during each off-peak period just in case. If the generation levels turn out lower than predicted, the software will re-plan to take advantage of any remaining lower rate energy where possible, but this may not be possible depending on your tariff.

The battery is charging from the grid sporadically during the day.

The software will plan to slowly increase the level of charge in the battery across the day if there is a higher rate peak period expected in the afternoon.

The battery is discharging at maximum rate sporadically during the day with energy being sent back to the grid.

If you have provided the support team with a suitable SEG tariff, your battery may be set to discharge at optimal times when export rates are high

The battery is fully charging from the grid overnight and not leaving any room to store additional solar, leading to solar generation being wasted/sent back to grid during the day.

The predictions for your upcoming consumption are based on your previous 14 days of data, with more emphasis placed on 1 day and 7 days previous, if your consumption was very high 7 days ago the software may predict this to happen again and fully charge from the grid in advance. The software can re-plan during the day but the battery may already be fully charged by that point, meaning any excess solar is then diverted to the grid.

When can I activate Smart mode?

When your battery is first installed and you have submitted your tariff details, your device is put in Balance mode. For 14 days after installation, we strongly recommend that it stays in Balance mode or Scheduled mode. If you put your device in Smart mode, we cannot guarantee optimal performance for your battery.

After that time, we will have enough data to generate accurate predictions for Smart mode, and we will review and recommend which mode out of Balance, Scheduled or Smart is most appropriate for you. We will continue to monitor your home’s energy data and adjust the mode we consider to be optimal for you. 

If you have chosen a different mode from the one we recommended, please note that this may impact your battery’s performance and the savings you could otherwise have made.

Is Smart mode suitable for all installs?

This feature is only compatible with our V4, 7.2 and 9.6kWh model systems, our V3 and V3C model batteries can still be set with a static plan.

For households where consumption is very unpredictable, we advise that a Scheduled plan may bring the best overall benefit, this can be set up based on any specific requirements you may have.

It’s important to note that because your Smart plan is generated using predictions based on your household electricity consumption and solar generation based on weather forecasts, unexpected changes may cause you to see less benefit, however, the battery will always look to cover your household consumption with the cheapest and cleanest energy available.

Can my Import and Export tariff be supported?

Smart mode offers optimised planning for Smart Export Guarantee (SEG) tariffs alongside any import tariff.

SEG is the mechanism to ensure solar panel owners are paid for the spare electricity they send to the grid. This came as a policy replacement for Feed-in Tariff which has closed to new applicants in March 2019.

SEG payments are based on the measured amount of electricity exported to the grid while FIT payments were ‘deemed’ or estimated to be 50% of the total electricity generated.

​​​​​We cannot optimise for the export from a Feed-in Tariff, unless you also have a SEG tariff and have opted out of your deemed export payments and are only receiving solar generation payment.

Will Smart mode utilise any price plunge events?

When price plunge events are known in advance, the battery will look to discharge ahead of time and charge up during a price plunge event, thereby increasing the amount of power being used from the grid. However, plunge pricing is not always announced in advance and in that case would not be considered by the software as part of the plan. In this scenario we would recommend using Scheduled mode to set a short charge intent to coincide with any plunge events.

What time of day is the plan automatically generated in Smart mode?

Our software will generate an automated plan at 10pm each evening for the next 48 hours ahead, this is to ensure the weather predictions are as accurate as possible. The software can also re-plan at any point during the day if the amount of charge in the battery deviates too far from the predicted level. In the event of any unexpected changes in your household usage, the battery will still try and re-plan to accommodate this as much as possible.

Can my battery support my tariff as well as other solar diverting devices or EV charger?

If you battery is in Scheduled mode this can be tailored to suit your exact requirements, the support team can help you set your battery to charge, discharge or stay idle between any set times over a 7 day period.

If your battery is in Smart mode, we would advise that any EV charging is kept as regular as possible, this should give our software a better chance to predict any upcoming charging, and optimise the battery to support it. If you have any other solar diverting devices running from your PV array set to a regular schedule this should allow our software to predict future behaviour and offer the most optimal plan. As standard, the battery will take priority and fully charge from any available solar before any other devices can begin to divert.

What to do if you’ve recently changed energy tariff?

Please contact your support team, they will arrange for a form to be provided by email which allows you to input your new tariff details, once completed please allow up to 2 working days for your new tariff to be implemented, you will then be able to see your new tariff in the Moixa Dashboard. If you’re on an automated charging plan your new tariff will be taken into consideration at the next planning event.