If your GivEnergy battery's state-of-charge keeps drifting after a full calibration cycle, we can recalibrate it remotely and check the BMS reporting. Diagnosis is free — you only pay if we fix it.
Book your free remote diagnosticGivEnergy hubBrilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
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.
The app shows 80% but the battery is clearly low, or it reads full immediately after a short charge
SoC drops sharply from 40% to 10% in minutes, or climbs from 20% to 80% without completing a charge
Two batteries in the same system show significantly different percentages when they should track together
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.
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.
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.
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.
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:
System mode, reserve SoC and schedule issues that stop the battery from powering the home
ProblemWhy off-peak grid charging fails and how to fix charge schedule and mode settings
SetupHow to read the dashboard, set schedules and monitor SoC history in the app
SetupIf calibration doesn't resolve odd readings, a full restart is often the next step
ProblemTemperature effects that can make capacity appear lower than actual — before blaming calibration drift
GivEnergyAll GivEnergy guides, fault fixes and configuration help in one place
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.
I’ve worked on hundreds of GivEnergy systems and know the kit inside out. If yours is playing up, my promise is simple — no fix, no fee: just £75 if we fix it, free if we don’t.
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