GivEnergy Battery Calibration:
Fix an Inaccurate SoC Reading
If your GivEnergy battery is showing the wrong percentage — appearing full when it empties quickly, or dropping in sudden jumps — the Battery Management System has lost track of the true capacity range. Calibration resets those reference points. This guide covers both the soft calibration method and the portal-based full calibration.
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GivEnergy recommends calibration when…
The Battery Management System tracks charge mathematically — if it hasn't seen the full range in a while, its reference points drift. These are the four signs to watch for.
Percentage looks wrong
The app shows 80% but the battery is clearly low, or it reads full immediately after a short charge
Sudden SoC jumps
SoC drops sharply from 40% to 10% in minutes, or climbs from 20% to 80% without completing a charge
Two batteries differ
Two batteries in the same system show significantly different percentages when they should track together
Installer recommends it
Your installer or GivEnergy Support has asked you to run a calibration cycle to resolve a specific issue
What calibration actually does
GivEnergy batteries use a Battery Management System (BMS) that tracks State of Charge mathematically — it counts energy in and out rather than measuring directly. Over time, especially if the battery has never been fully charged and fully discharged, these reference points drift. Calibration re-establishes the upper (100%) and lower (0%) charge boundaries so the maths lines up with reality again.
Important: Calibration fixes BMS drift — it does not recover lost battery capacity. If your battery genuinely holds less charge than it used to after calibration, that is a capacity degradation issue, not a calibration issue.
Full Charge then Full Discharge
Soft calibration is the standard first step. It works by letting the BMS experience the full range of the battery — from 100% down to the reserve floor — so it can reset its reference points. No portal access or special tools needed.
Let the battery discharge to its Reserve SoC floor
Allow the battery to power the home normally until it reaches the Reserve SoC (typically 10%). Do not manually lower the reserve just for calibration — the floor is where it is for a reason. If you're not sure what your reserve is, check Settings in the app or portal.
Charge fully to 100% during your next off-peak window
Set your charge target to 100% and let the battery charge completely during your off-peak window. For most UK households this is overnight. Use your normal charge schedule — don't change anything else.
Let the battery sit at 100% for at least 30 minutes
Once at 100%, allow the battery to hold that level for at least 30 minutes before it begins discharging. This gives the BMS time to register the upper boundary correctly.
Check the SoC reading over the following 24–48 hours
Monitor the SoC in the app. It should now change more gradually and linearly. One complete cycle is usually enough for minor drift. If the reading still looks wrong, repeat the cycle once more before trying the portal calibration.
💡 For All-in-One (AIO) systems — charge rate tip
The GivEnergy official guide recommends that AIO systems target a charge rate above 3.6 kW — ideally 3.8–4.2 kW — during calibration cycles. This rate helps maintain cell temperature and produces the most accurate BMS recalibration. Check your charge current setting in the app under Settings > Charge Rate and ensure it isn't set too low.
Full Calibration — Portal Calibrate Button
If a full charge/discharge cycle didn't correct the reading, GivEnergy provides a Calibrate Battery button in the portal. This forces a deeper re-evaluation of the battery's internal energy model. Availability depends on your inverter model and firmware version.
Log in to the GivEnergy Portal on a web browser
Go to givenergy.cloud on a computer or tablet. The portal has more options than the mobile app. Log in with your GivEnergy account credentials.
Open My Inverter and navigate to Battery Settings or Remote Control
From the dashboard, select your inverter. Look for Battery Settings, Remote Control, or a Battery tab in the navigation. The exact location varies by firmware version — if you don't see a Calibrate button, try the Remote Control panel.
Click the Calibrate Battery button
The system will tell you if any conditions must be met before calibration can start (for example, a minimum SoC may be required). Follow any on-screen prompts. The calibration process runs in the background — the battery continues operating normally during this time.
Monitor the SoC reading over the next 24 hours
Check the portal's SoC history graph the following day. The reading should now track smoothly. If the Calibrate button is not available for your model, stick with the soft calibration method — two full cycles usually achieve the same result.
The Calibrate button isn't showing for my system
Not all inverter models or firmware versions expose the Calibrate Battery button. If you can't find it, perform two consecutive soft calibration cycles (full charge → full discharge → full charge) and check whether the reading improves. If it doesn't, contact your installer or STS — at that point the issue may be a BMS fault rather than simple drift, which requires a different approach.
Two Batteries Showing Different Percentages
GivEnergy systems with two or more battery units should keep the batteries balanced — their SoC readings should stay within a few percentage points of each other. A large persistent gap between them is one of the signs that calibration is needed.
✓ Normal variation
A few percentage points difference between two batteries during active charge or discharge is normal — they balance throughout the cycle. A difference of 2–5% that converges when the system is idle is not a problem.
⚠ Worth investigating
A persistent gap of 10% or more that doesn't converge when the system is idle, or one battery consistently reading much lower than the other, suggests BMS drift in one unit — calibration is the first step.
Run a full charge to 100% — let both batteries reach 100% together
This is the most important step for dual-battery calibration. Both units must reach 100% simultaneously. If one battery charges to 100% and the other is stuck at a lower percentage, there may be a balancing issue as well as a calibration one.
Let them discharge together through normal household use
Allow both batteries to discharge in parallel — this is the normal operating mode. Monitor whether the gap between them decreases as they discharge. A gap that widens during discharge (one depleting faster) may suggest a genuine capacity difference rather than just calibration drift.
Use the Portal Calibrate button if the gap persists after two cycles
If the readings are still significantly different after two complete charge/discharge cycles, use the GivEnergy portal's Calibrate Battery function. If one battery still reads significantly different after portal calibration, contact your installer — one battery may have a genuine capacity issue.
What to check after calibration
Three quick checks to confirm the calibration worked — and to know when to stop trying yourself and call for support.
Check the SoC history graph in the portal
After calibration, the SoC history graph should show smooth, gradual changes — a steady rise during overnight charge and a gradual fall through the day. Sudden vertical drops or jumps in the history graph indicate the BMS is still struggling — try a second calibration cycle before escalating to support.
Verify the overnight charge is completing correctly
After calibration, the overnight charge should now hit your target SoC (e.g. 100%) within the expected time. If the battery is reaching the target sooner than expected, the BMS now has a more accurate picture of capacity — you may need to adjust your charge schedule start time slightly.
Check the event log for any BMS fault codes
Go to the portal's event log (My Inverter → Event Log) and check for any BMS-related fault codes after the calibration cycle. A clean event log confirms the calibration ran without issues. Any persistent error codes after calibration should be flagged to your installer or STS.
Contact STS if:
You can handle this yourself:
Related GivEnergy guides
Battery Not Discharging
System mode, reserve SoC and schedule issues that stop the battery from powering the home
ProblemBattery Not Charging Overnight
Why off-peak grid charging fails and how to fix charge schedule and mode settings
SetupGivEnergy App Guide
How to read the dashboard, set schedules and monitor SoC history in the app
SetupFull Restart Procedure
If calibration doesn't resolve odd readings, a full restart is often the next step
ProblemCold Weather Performance
Temperature effects that can make capacity appear lower than actual — before blaming calibration drift
GivEnergyGivEnergy Hub
All GivEnergy guides, fault fixes and configuration help in one place
Frequently asked questions
GivEnergy battery SoC readings drift when the BMS loses track of the true charge range — this happens if the battery hasn't completed many full cycles, or has been partially cycled for a long time. A full charge to 100% followed by a discharge to the reserve floor lets the BMS reset its reference points. If the reading is still significantly wrong after two calibration cycles, or if it's a sudden large jump rather than gradual drift, there may be a BMS fault rather than drift — contact your installer or STS for a diagnostic.
A persistent SoC mismatch between two batteries in the same system usually means one battery's BMS has drifted further than the other. Run a full charge/discharge calibration cycle — both batteries must reach 100% simultaneously. If the gap is still significant after two cycles, use the portal Calibrate Battery function. A large gap that doesn't improve after calibration suggests one battery has a genuine capacity difference, which needs investigation rather than just recalibration.
GivEnergy batteries don't need routine calibration — the BMS self-corrects during normal daily cycling. Only calibrate when you notice the SoC reading looks wrong, the battery is behaving unexpectedly, or your installer or GivEnergy Support recommends it. If your system reliably charges to 100% and discharges through the day, the BMS stays well calibrated automatically. Deliberately running extra calibration cycles unnecessarily doesn't benefit the battery.
No — calibration is safe and recommended by GivEnergy. A full charge to 100% followed by a discharge to the reserve floor is well within the battery's normal operating range. GivEnergy lithium batteries are designed for deep daily cycling and the calibration process is just a normal full cycle. The portal Calibrate Battery function is manufacturer-supported. What you should avoid is deliberately discharging well below the Reserve SoC floor or leaving the battery completely empty for extended periods — neither is necessary for calibration.
SoC still wrong after calibration?
If the percentage is still significantly off after two cycles and a portal calibration, there may be a BMS fault or a genuine capacity issue that needs a proper diagnostic. Our engineers work on GivEnergy systems regularly — tell us what you're seeing and we'll advise on next steps.