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Understanding Battery State of Charge


Battery state of charge shows how much usable energy remains in your battery system.

It is displayed as a percentage and will move up and down throughout the day depending on solar production, property power use and whether the batteries are being charged from solar, the grid or a generator.

Battery Levels to Watch

60–100% — Normal

The battery has a good level of stored energy and normal household use can continue.

During strong solar conditions, the batteries may remain within this range for much of the day.

40–60% — Monitor

The battery level is reducing but is not normally a concern.

Check:

  • Current solar production
  • Time of day
  • Weather conditions
  • Current property load

If it is late in the day or poor weather is expected, avoid unnecessary power use.

20–40% — Take Notice

Start managing power use, particularly if there is limited solar available.

Consider:

  • Delaying washing machines and dishwashers
  • Turning off pool pumps
  • Avoiding EV charging
  • Reducing heating or air-conditioning use
  • Avoiding several large appliances at the same time

If the system has a backup generator, confirm it has fuel and is ready to operate.

10–20% — Low Battery

This is generally the lower operating range, depending on the battery type and system settings.

At this point:

  • The generator or grid may begin charging automatically.
  • Non-essential loads should be turned off.
  • Large appliances should be avoided.
  • Power use should be limited until charging begins.

Some systems may start the generator before reaching 20%.

Below 10% — Critical

The system may shut down to protect the batteries if no charging source is available.

Turn off non-essential loads and check whether:

  • The generator is running
  • The grid is available
  • Solar production has started
  • Any system alarms are active
What Affects Battery State of Charge?

Battery levels are affected by:

  • Solar production
  • Weather and season
  • Property power use
  • Battery size
  • Battery condition
  • Generator or grid charging
  • Large appliances operating together

High-demand equipment such as air conditioners, ovens, pumps, electric hot water and EV chargers can reduce battery levels quickly.

Reducing Battery Discharge

When battery levels are low:

  • Use only essential appliances.
  • Run large loads during daylight hours.
  • Avoid using several high-demand appliances together.
  • Turn off unused lighting and equipment.
  • Delay EV charging, pool pumps and water heating.
  • Reduce heating and cooling where practical.

Use your monitoring platform to watch both battery percentage and current power use. Higher loads will cause the battery to discharge faster.

When to Contact MyEnergy

Contact MyEnergy if:

  • The battery level drops much faster than normal.
  • The batteries are not charging during good solar conditions.
  • The generator does not start.
  • The system shuts down while the battery level is still high.
  • The battery percentage remains unchanged for a long period.
  • A battery alarm continues to appear.

The displayed percentage is an estimate and may occasionally adjust as the battery system recalculates available capacity.