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Setup guide · GivEnergy battery

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, and the BMS firmware we recommend for keeping packs balanced.
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  • Soft calibration steps
  • Portal calibration button
  • Two-battery SoC mismatch
  • When to escalate
Still inaccurate after calibration?

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.

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Contacted Solar Tech about my Givenergy battery storage system that wasn't working. Battery status was "idle". Given the company Givenergy had gone bust, I need independent quality technical help. Very patient and clearly very knowledgeable about battery systems Ron diagnosed possible issues and suggested several possible remedies. Worked our way through them and fortunately it began to work. The fault was very specific and only an experienced engineer would have thought to check. Suffice to say I'll be back if I need independent support again. Lastly you only pay if there is a solution. Outstanding.

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Outstanding support, very detailed knowledge of the system and clarity on what was needed to fix it, no hesitation in recommending them to all.

Robert Grant · Jul 2026 Google

Had issues with 10yr+ installation. 1 inverter going into alarm mode, unable to access monitoring apps and wanted someone to review and document worthiness of the 2 systems I have. As you will find with older systems, the original installers have moved on, other companies only want to replace and install new, or make up silly prices as they don't want the work, so struggling for 18 month plus trying to source someone to do this. Ronald managed to fit me in the day after contact as he was in the area. Spent a couple of hours on site, found issue with the inverter alarm and he monitoring this to find a total solution, got me back onto the monitoring apps, provided a report on the installations and identified potential areas of concern. These are the people you need for diagnostic reviews of your installations, long term industry professionals, who have a wealth of knowledge gained through working in the industry, know the differing systems and how to contact and approah the companies involved. These are the people you need if you are having issues with installers and / or product and/or supply companies.

M Foster · Jul 2026 Google

Called spoke to Ron. Was very informative and more importantly listen to the issues regarding my system. Was very professional and tackled the problem and had my system back on it's way. Thank you once again Ron

Shawn Carmichael · Aug 2026 Google

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

Solar Tech Support is an absolute lifesaver. My solar and battery system stopped working completely, but after one quick phone call, they fixed the problem straight away. The original provider, GivEnergy, has gone into administration, leaving me entirely without support from the original installers. It was a terrible situation on GivEnergy’s part, but thankfully, Solar Tech Support came to the rescue!

sohaib maroof · Jul 2026 Google

Written by · Independent Solar Engineer Last updated

When calibration is needed
Signs

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 an independent engineer 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.

Method 1 — start here
Soft Calibration

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.

1

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.

2

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.

3

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.

4

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.

Method 2 — persistent inaccuracy
Portal Calibration

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.

1

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.

2

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.

3

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. Be aware that calibration is a full cycle. It discharges the battery to empty and then recharges it, so through the cycle the battery is NOT available for normal self-consumption and your bills will look wrong for a day or so.

4

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.

Multi-battery systems
Multiple Batteries

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.

1

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.

2

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.

3

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.

4

If the gap keeps coming back, check each battery's BMS firmware

Look up the BMS version for each battery on the Software tab in the GivEnergy portal, or ask us to check it. In our experience firmware 3022 on Gen 1 and Gen 2 batteries, and 4009 on Gen 3 batteries, are very good at keeping packs balanced. If a battery is on an older version, contact us rather than running a portal or app update. We can update it on a callout, or talk you or your electrician through it remotely.

The BMS firmware we recommend

Gen 1 and Gen 2 LV batteries

BMS 3022

Gen 3 batteries (5.12 kWh and 9.5 kWh)

BMS 4009

In our experience both versions are very good at keeping packs balanced. If your SoC keeps drifting, or two batteries keep showing different percentages, the firmware is one of the first things to check. All-in-One batteries and the HV stackable batteries run their own firmware lines.

The GivEnergy portal and app do offer updates, but we do not advise running them. We update firmware manually, to our own written procedures, and we tell you what is involved before anything is done. We can do it on a callout, or supply the right file and talk you or your electrician through it remotely.

What changed in each version, for both lines, is in our SOC bug guide.

After calibration
Verification

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.

1

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 getting it diagnosed.

2

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.

3

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. GivEnergy Ltd entered administration on 9 April 2026 and no longer runs a residential support desk, so there is no manufacturer to report them to. If the fault turns out to be hardware, our GivEnergy warranty page sets out which routes may still be open.

Contact STS if:

• SoC is still significantly wrong after two soft calibration cycles
• Portal calibration ran but made no difference
• Two batteries are still mismatched after calibration
• Battery reaches Reserve SoC much faster than it used to
• BMS fault codes appear in the event log
• A battery is on older BMS firmware than 3022 (Gen 1 and Gen 2) or 4009 (Gen 3)

You can handle this yourself:

• Running the soft calibration cycle (charge/discharge)
• Using the portal Calibrate Battery button
• Monitoring SoC history after calibration
• Repeating the cycle a second time if needed
• Adjusting charge schedule after calibration corrects capacity
Related guides

Related GivEnergy guides

Problem

Battery Not Discharging

System mode, reserve SoC and schedule issues that stop the battery from powering the home

See Battery Not Discharging →
Problem

Battery Not Charging Overnight

Why off-peak grid charging fails and how to fix charge schedule and mode settings

See Battery Not Charging Overnight →
Setup

GivEnergy app & portal guide

How to read the dashboard and state-of-charge history in the app and portal

See GivEnergy app & portal guide →
Setup

Full Restart Procedure

If calibration doesn't resolve odd readings, a full restart is often the next step

See Full Restart Procedure →
Problem

Cold Weather Performance

Temperature effects that can make capacity appear lower than actual — before blaming calibration drift

See Cold Weather Performance →
GivEnergy

GivEnergy Hub

All GivEnergy guides, fault fixes and configuration help in one place

See GivEnergy Hub →
FAQ

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. If the gap keeps coming back, check which BMS firmware each battery is on: in our experience 3022 (Gen 1 and Gen 2) and 4009 (Gen 3) are very good at keeping packs balanced. A large gap that doesn't improve after calibration suggests one battery has a genuine capacity difference, which needs investigation rather than just recalibration.
We recommend BMS firmware 3022 for Gen 1 and Gen 2 LV batteries, and 4009 for Gen 3 batteries. In our experience both are very good at keeping packs balanced, so if two batteries keep showing different percentages, check which firmware each one is on. The version shows on the Software tab in the GivEnergy portal, or we can check it in the free remote diagnostic. The portal and app do offer updates, but we do not advise running them. We update firmware manually, to our own written procedures: on a callout, or by supplying the right file and talking you or your electrician through it remotely. Contact us if a battery is on an older version. Our SOC bug guide lists what changed in each version.
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 an independent engineer 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 it was the process GivEnergy's own documentation recommended. 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 button is a standard portal function and still works, though GivEnergy Ltd is in administration, so there is no manufacturer support desk standing behind it. 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.
The remote diagnostic is free. If two calibration cycles and a portal calibration haven't fixed the SoC reading, we connect to your GivEnergy data and tell you whether it's a BMS fault, a genuine capacity difference, or a settings issue. If we can fix it remotely it's £125, and you only pay if we fix it; any on-site work is quoted first, from £295. If it turns out to be a genuine BMS fault or capacity loss, read GivEnergy gone bust — what it means for your warranty before assuming a free replacement. See also our GivEnergy battery not charging guide.
Usually the same day. We confirm whether it's genuine SoC drift or a BMS fault in a 30-minute remote session — reading your GivEnergy portal data and battery history — and you get a written summary of the cause and the recommended fix straight after the call.
Book

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.

  • Remote diagnostic — no visit needed
  • GivEnergy-experienced engineers
  • Clear report of findings and next steps

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