Outback inverter - SimpliPhi batteries dead or not charging

When to Use This

Use this guide when:

• The inverter is off
• The system appears dead or unresponsive
• Batteries are not charging

Most Likely Cause

1. Batteries discharged too low overnight
2. The battery BMS shut down to protect the cells

When this happens:

• The inverter cannot start
• Charging may not begin automatically
• The system must be manually reset

If the MATE Screen is OFF 

Your batteries likely discharged too low and shut down to protect themselves. The system needs to be restarted.

Step 1: Turn Off all DC breakers

Locate and turn OFF all DC breakers, including:

1. The PV (solar) breaker
2. The charge controller breaker
3. The inverter/battery DC breaker

Why:

This fully isolates the batteries and prevents the system from interfering while they are being reset.

Step 2: Reset the Batteries

Locate the switch on the top of your SimpliPhi batteries:

1. Switch all of the batteries OFF
2. Wait about 10 seconds
3. Switch them all back ON

Step 3: Turn On Solar Charging

Turn on:

• The DC breaker for PV
• The DC breaker for the charge controller

Leave the inverter off for now

Step 4: Wait for the Batteries begin to Recover

The batteries need to gain some charge before the system can restart. This won't work if it's night-time, and if it is heavily clouded this could take some time. 

Look for:

• Charge controller turning on
• Signs of charging
• Battery level increasing

Step 5: Turn the Outback Inverter On

Once charging has started:

• Turn PV breaker for the inverter back on

Your home should regain power

If the System Does Not Recover

Please contact us if:

• No lights appear on the batteries
• No charging occurs in sunlight
• The system does not turn back on