Solis battery wake-up procedure
Waking a deeply discharged battery on a Solis system
If your battery has been fully drained after a power cut and is no longer showing any lights, this guide walks you through the full wake-up procedure. It covers both the hardware reset on the battery side and the software override on the Solis inverter side. Both phases are needed for a successful recovery.
You will likely see one of these symptoms on your inverter screen:
The inverter cannot detect your battery at all. This is the most common fault code after a complete discharge.
The communication link between the inverter and battery has dropped because the BMS has entered protection mode.
Before you start
Do not attempt to open the battery enclosure or connect any external chargers yourself. Battery recovery involves working with live DC voltages and should only be carried out by a qualified engineer with the right equipment and PPE. This guide is intended for PureVolt engineers or for customers who have been specifically instructed by PureVolt to follow these steps.
Check the battery lights first. Press the power button on your battery. If you see no LED lights at all, the cell voltage may be too low for the BMS to activate even after a hardware reset. In that case, the battery needs a manual DC charge by an engineer — the inverter's wakeup menu will not be enough. Contact us and we will arrange a site visit.
If you see some LED activity when you press the power button (even just a brief flash), you can proceed with this guide. The procedure works for Solis Series 5 and Series 6 EH1P5K hybrid inverters, paired with common battery brands including Dyness and Pylontech. Button labels may vary slightly by model.
Phase 1: Battery hardware reset
This phase clears the BMS protection mode that was triggered by deep discharge. Work through each step in order:
- Isolate the battery from the inverter
Turn off the DC breaker or isolator located between the inverter and the battery. This safely separates the two units before you begin.
- Power down the batteries
Turn off the physical power switch on each battery unit. If you have multiple batteries in a stack, power them all down.
- Reset the communications cable (recommended)
Unplug the CAN or RS485 communication cable connecting the master battery to the inverter. Wait 10 seconds, then reconnect it firmly until it clicks into place. A loose or partially seated cable is a common cause of ongoing communication faults.
- Power the batteries back on
Turn the physical power switch on all batteries back to the ON position.
- Trigger the master battery
Locate the master battery (the unit connected directly to the inverter, usually the top unit in a stack). Press and hold the red SW or Reset button for approximately 3–15 seconds until the LED lights sequence and illuminate.
- Reconnect the DC breaker
Turn the DC breaker or isolator between the battery and the inverter back ON.
Phase 2: Solis inverter battery wakeup menu
With the battery hardware reset complete, you now use the Solis inverter's built-in Battery Wakeup function to force a controlled trickle charge from the grid. This brings the battery voltage back to a level where the BMS can sustain itself.
- Press Enter on the inverter to open the main menu.
- Scroll to Advanced Settings and press Enter.
- Enter the password when prompted: Press Down, Down, Up, Down, Enter — this inputs the code
0010. Each Down sets that digit to 0; Up sets it to 1.See our Solis battery timing guide for the full Advanced Settings navigation reference, including button layouts and screenshots.
- Scroll to Storage Energy Set and press Enter.
- Scroll to Control Parameter and press Enter.
- Scroll to Battery Under Voltage — this will likely show 42V.
- Press Enter, change the value down to 40.0V, then press Enter to confirm, then press Escape.Why lower the voltage?
A deeply discharged battery may be sitting below the inverter's default 42V cutoff. Lowering the threshold to 40V temporarily allows the wake-up charge to flow into the battery. This is a temporary setting — it does not affect your normal battery protection.
- Scroll to Save and Send and press Enter.
- Scroll to Battery Wake Up and press Enter — the screen should briefly display “Done”.
- Press ESC repeatedly to return to the home screen.
The inverter may take a few attempts to establish communication and begin charging. If “Done” appears but no charge flow shows on the home screen within a minute or two, repeat Phase 2 from the start. It is not unusual for the wake-up to require two or three cycles before the battery responds.
What to expect
Once the wake-up procedure is complete, here is what you should see:
The home screen diagram should show power flowing from Grid → Battery. This confirms the trickle charge has begun.
The inverter will trickle-charge from the grid until the battery reaches roughly 10–20% SoC, at which point the BMS can sustain itself and normal solar charging resumes automatically.
An alarm beeping during the wake-up process is normal and should stop once the battery voltage reaches a safe threshold. Do not be alarmed by this.
If the wake-up does not succeed after one attempt, repeat Phase 1 and Phase 2 once more. If it still does not work, the battery may need a manual low-current DC charge by an engineer — contact us and we will arrange a visit.
Need a hand?
If you are unsure at any step or the wake-up does not work after two attempts, get in touch with your installation team at PureVolt.ie and we will help you through it or arrange a site visit. We would much rather you check with us than try anything that could damage your equipment.
You might also find these guides useful:
- Battery dead after a power cut — what to do if your battery won't turn on.
- Solis fault codes explained — what each code means and what to check.
- Solis battery communication fault (code 2012) — battery communication troubleshooting.