Tell us the symptom, your BMS firmware version, and how long it has been happening. We review portal data remotely — battery graph, firmware history, and cell-level health — to determine whether the fix is a calibration cycle, a firmware update, or a hardware issue.
Book your free remote diagnosticGivEnergy hubIndependent — not affiliated with GivEnergy Ltd.
Ronald was fantastic he was insistent in his approach to fixing my battery comms, inverter data corruption, he was fantastic explaining every step of the way, my installer couldn't fix the problem for a year, he did it in z few hours. If you need tech support go here he is fantastic
Ron is one of those rare finds - an engineer's engineer. He insightfully and accurately diagnosed the problems with our GivEnergy system, very quickly, which helped get us back on track. We will be using him again!
What an amazing service. They got my solar inverter back up and running after a firmware update went wrong. It is a breath of fresh air to deal with such a professional company.
Ron has come to our rescue once again! After sorting out our GivEnergy battery issue, he was on hand to help us find a solution to data logging issues caused during install of an additional inverter. He's helpful, patient and extremely knowledgeable. Utterly brilliant service. Thank you again!
The Solar Tech Support company was the only one to respond to a request for someone to supply and fit a new inverter for our solar panels after our old one finally expired after 26 years. Ron kept us well informed throughout, came and ascertained that the issue was down to the inverter having failed then sourced and fitted a new one. He got the system up and running again, set up the wi-fi performance feedback and took away the old inverter for disposal. By acting promptly and fitting the job around existing commitments we were able to get our solar power unit back in operation with minimal delay in the short while before we were due to go away for a week. The work was carried out very professionally and we were asked to confirm that all was in order the following day. I was impressed that, having recently taken on additional work for GivEnergy customers we were able to keep our solar panel down-time to a minimum. I would highly recommend for prompt attention and first-rate service.
Ron is incredibly knowledgeable about solar installs in general but knows givenergy products inside out and the key personnel that worked there from the start to the end. My problem was spurious in its nature but Ron spotted it straight away when he understood the installation details. In essence the installers didn’t fit the correct trip switch. He also gave me hope that in the future hardware repairs could be possible but it’s still early days. This guy really is in the know and keen to sucas a business If you need help don’t hesitate
Work through these steps in order. Step 1 identifies the symptom pattern. Steps 2–3 fix the majority of cases. Steps 4–5 cover hardware and firmware causes. Step 6 prevents recurrence.
The bug presents differently depending on firmware and battery generation. The main patterns are: sudden large drops (SOC falls 30–50% in under an hour despite low house load — the most common symptom), SOC stuck at a fixed percentage that does not change regardless of charge or discharge, stepping (SOC jumps in discrete blocks instead of changing gradually — vertical lines on the graph), multi-battery divergence (two batteries showing significantly different percentages), or false 100% (battery reports full but clearly is not). Open the portal and check the battery graph for the last 7 days — the shape of the fault tells you what is happening.
In givenergy.cloud, go to My Inverter → Software. The BMS version is the critical number. The key milestones: BMS 3007 (April 2022) was the first release aimed at SOC jumps. BMS 3012 (May 2023) added temperature-adjusted calibration and open-circuit voltage (OCV) offset correction. BMS 3013 (July 2023) widened the SOC calibration range from 50% to 80%. BMS 3017 (May 2024) changed the speed of dynamic SOC calibration and added compensation for a 30 mA standing current loss that let the SOC drift during long idle periods. BMS 3020 (March 2025) was the next public release. BMS 3022 (June 2025) fixed the SOC sticking at 100% after a minor over-voltage alarm. We recommend 3022 for every Gen 1 and Gen 2 battery, and the update matters most on anything older than 3017, the main SOC accuracy update. Gen 3 batteries run a separate 4000-series line, where BMS 4009 (January 2025) is the version we recommend. In our experience 3022 and 4009 are both very good at keeping packs balanced. Every version GivEnergy has logged, for both lines, is listed further down this page.
A calibration cycle gives the BMS two known reference points to correct its estimate. Let the battery run down to 4% under normal house load. A Timed Discharge window with a 4% target does this, but it follows the house load, so the battery only empties as fast as the home uses power. Once it reaches 4%, charge it to 100%, from solar the next day or with a Timed Charge window overnight, leaving Eco mode on. For multi-battery systems, both batteries must reach 4% at the same time so the BMS modules can resynchronise. One cycle fixes mild drift. If the SOC has been significantly wrong for weeks, repeat the cycle. Best practice: run a proactive calibration once a month to prevent drift accumulating.
This is an under-reported cause. Some GivEnergy battery packs have been found with internal connectors that were not fully tightened during manufacturing — loose by two to three turns. A loose connection causes intermittent voltage measurement errors that the BMS reads as sudden capacity changes. If you can safely access the battery, check that all external cable connections to the terminals are firm. Internal connectors require an engineer. If tightening a loose connection resolves the SOC jumps immediately, the BMS logic was not faulty — it was receiving bad voltage data from the start. This fix is permanent and does not require ongoing calibration cycles.
On a Gen 1 or Gen 2 battery, if your BMS is below 3017, an update may significantly improve SOC accuracy. The GivEnergy portal and app do offer updates, but we do not advise running them. We update firmware manually, to our own written procedures, with the right file for your inverter and battery: on a callout, or by talking you or your electrician through it remotely. Contact us if you think yours needs one. Firmware updates frequently reset settings such as the system mode, charge/discharge window times, SOC targets, export limit and CT clamp direction to defaults, so we record them first and put back anything that changed. After the update, the SOC reading may drop sharply — even to 0%. GivEnergy has confirmed this is expected behaviour when updating from pre-3012 firmware: the new logic recalculates the true SOC, which can look alarming but should correct within 24 hours. On a Gen 1 or Gen 2 battery, BMS 3022 is the version we recommend; on a Gen 3 battery it is 4009. All-in-One batteries run their own firmware line. Run a full calibration cycle on all batteries once the update is done.
After calibration, watch the portal graph for two weeks. If the SOC moves smoothly and the daily totals match your expectations, the calibration has worked. To prevent the bug returning, avoid leaving the battery in a narrow charge band for extended periods — batteries that rarely discharge below 50% lose calibration accuracy because the BMS has no low-end reference point. A monthly full calibration cycle is the most reliable preventive measure. If the SOC bug returns within days of a successful calibration, the issue is likely hardware — a degraded cell, a failing BMS module, or a loose internal connection. Contact STS for a remote diagnostic — we review your portal data, firmware version, and cell-level health to determine whether the fix is software or whether the battery needs a site visit.
GivEnergy has improved SOC accuracy step by step across many BMS firmware versions. No single version removes the problem, because LiFePO4 chemistry makes the charge level hard to estimate, but taken together the updates have narrowed the margin of error.
GivEnergy's low-voltage Gen 1 and Gen 2 battery packs run one BMS firmware line (the 3000 series). Gen 3 packs run a separate line (the 4000 series), so the two sets of numbers cannot be compared: a higher number does not mean a newer version. Both lines are listed below, and we have put each change GivEnergy logged into plain English. The All-in-One batteries run a third line (BAAA and BADA numbers), which this page does not cover.
OCV in these notes means open-circuit voltage: the cells' voltage at rest, which the BMS checks against a table to correct its SOC estimate.
Find the BMS number under My Inverter, then Software, in givenergy.cloud. Gen 1 and Gen 2 batteries run the 3000 series (with some early 1000-series numbers); Gen 3 batteries run the 4000 series.
The earliest versions, from 2021 and before. GivEnergy's notes say the battery balancing function was only switched on in 3002, so a battery still on one of these is well overdue an update to 3022.
Balancing switched on (3002, October 2021) and strengthened (3005), then the first fix aimed at SOC jumps (3007, April 2022).
The calibration overhaul (3012, May 2023) and its follow-ups. 3013 could set the SOC to 0% when the parallel function failed or raised an alarm; 3014 fixed that, and GivEnergy marked 3015 (October 2023) as final.
Widely considered the main SOC accuracy update (May 2024), and the first version GivEnergy labelled BMS 2.0.
The public release of March 2025, and the first general release after 3017.
June 2025: the newest version on GivEnergy's log for Gen 1 and Gen 2 batteries, and the one we recommend.
Builds GivEnergy marked as not issued (3016), internal only (3018), beta and internal (3019) or internal testing (3021). Their changes are listed below, but they were not general releases.
Beta builds of 3014. A number in this range is not newer than 3022.
Not on GivEnergy's Gen 1 and Gen 2 log, which ends at 3022. On GivEnergy's separate Gen 3 log, 4001 is the earliest numbered build (listed with 4002) and predates 3022, so on these packs the higher number does not mean a newer version. See why some GivEnergy batteries are limited to 80%.
Older Gen 3 builds, up to October 2024. We recommend 4009.
January 2025, and the Gen 3 version we recommend. In our experience it is very good at keeping packs balanced.
September and December 2025. GivEnergy labelled 4010 its release build and 4011 a pre-release. 4010 fixed the SOC sticking at 100% on systems that mix Gen 3 and Gen 2 batteries.
The newest version on GivEnergy's log for Gen 1 and Gen 2 batteries, and the one we recommend. GivEnergy listed it as a pre-release. Run a full calibration cycle on every battery after updating.
A test build GivEnergy kept in-house.
The first general release after 3017.
A beta that changed the temperature-based charge rates and added cold-weather hibernation.
An internal build, and the first to keep charging when the SOC reads 99% but the cells are not yet full.
Widely considered the most significant SOC improvement, and the first version GivEnergy labelled BMS 2.0 (every later version carries the same label). It also made mixed Gen 1 and Gen 3 stacks possible.
GivEnergy marked this build as never issued.
Two stability fixes.
A beta whose test builds GivEnergy numbered from 3099 down to 3086. Voltage alarms can now clear themselves, and a failure or alarm in the parallel function no longer sets the SOC to 0%.
A wider calibration window and fewer conditions on parallel batteries.
The calibration overhaul: full-charge calibration that depends on temperature, look-up tables that allow for ageing, and new current measurement.
The first release aimed at SOC jumps.
Stronger balancing.
Cell balancing switched on.
New cell voltage limits and a faster response.
A faster voltage response and better support for five batteries in parallel.
Cell-level alarm and protection limits.
Housekeeping and remote restart.
The earliest version on GivEnergy's log.
Version numbers are not strictly in date order. In 2021 two series ran side by side (1037 to 1041, and 3001 to 3002), and the 3014 beta builds were numbered 3086 to 3099. From October 2021 onwards every release is in the 3000 series. Numbers missing from this list, such as 3008 to 3011, do not appear in either of GivEnergy's logs.
The newest version on GivEnergy's Gen 3 log. GivEnergy listed it as a pre-release.
GivEnergy's release build for Gen 3 batteries. It fixed the SOC sticking at 100% on systems that mix Gen 3 and Gen 2 batteries.
The Gen 3 version we recommend. In our experience it is very good at keeping packs balanced. GivEnergy's release labels in 2026 showed it as the previous version, behind 4010.
Communication and parallel fixes, including for systems that mix Gen 1 or Gen 2 batteries with Gen 3.
Faster calibration, a fix for SOC drift through long idle periods, and protection against loading the wrong generation's firmware. It came out the same day as 3017 on Gen 1 and Gen 2, which also added the 30 mA compensation.
An internal build that brought the Gen 3 SOC calibration in line with the Gen 1 and Gen 2 BMS.
An internal build that reworked SOC calibration.
The first dated Gen 3 build. GivEnergy's older knowledge base article called it the factory release.
A model code change only.
The earliest numbered builds on the Gen 3 log, listed together.
GivEnergy's Gen 3 log ends with the first official firmware for the BMS-3.0C board. It has no version number.
Versions 4001 to 4003, 4005 and 4006 carry no date on GivEnergy's logs. GivEnergy's release labels in 2026 showed 4011 as a pre-release, 4010 as the release and 4009 as the previous version. GivEnergy's Gen 2 and Gen 3 hybrid inverter logs (versions A922 and A317) say the inverter's AI self-heating feature needs BMS 3022 or later, or 4009 or later.
Sources: GivEnergy's knowledge base article Low voltage firmware revisions (versions 1036 to 3017, dated 14 August 2024); GivEnergy's BMS Gen 1 & 2 Firmware Log (versions 3012 to 3022, archived copy from April 2026, as the support portal page is no longer online); GivEnergy's BMS Gen 3 Firmware Log (versions 4001 to 4011, archived copy from April 2026) and its older knowledge base article G3 battery (versions 4004 to 4007, dated 14 August 2024, archived copy), which labelled 4004 the factory release and 4005 and 4006 internal releases; GivEnergy's Gen 2 and Gen 3 hybrid inverter firmware logs (archived copies from April 2026) for the self-heating requirement; and GivEnergy's own release labels as published in June 2026, which listed 3022 as a pre-release, 3020 as the release and 3017 as the previous version for Gen 1 and Gen 2, and 4011, 4010 and 4009 the same way for Gen 3. GivEnergy's notes are brief; where a change is open to more than one reading, we have kept to what the note says.
GivEnergy batteries use LiFePO4 (lithium iron phosphate) chemistry, which is excellent for longevity and safety but presents a fundamental challenge for SOC estimation. Unlike other lithium chemistries, LiFePO4 has a very flat voltage curve between roughly 20% and 80% SOC — the voltage barely changes across 60% of the battery's capacity. This makes voltage-based SOC estimation unreliable in the range where the battery spends most of its time. The BMS falls back on coulomb counting — tracking current flow in and out over time — which works well in the short term but accumulates small measurement errors over weeks and months. Without periodic recalibration at known reference points (near-empty and full), these errors compound until the displayed percentage diverges significantly from reality.
One of GivEnergy's beta testers, passing on the findings of GivEnergy's own investigation, reported peak voltage degradation: the peak voltage the cells reach during charging can fall over time, leading to reduced capacity and sudden SOC drops. GivEnergy's firmware log records a related change: from BMS 3018 onwards, the battery keeps charging at a reduced rate when the SOC reads 99% but the cells are not yet full. The issue affects all GivEnergy battery generations (Gen 1, Gen 2, Gen 3, and All-in-One), though Gen 3 batteries with BMS3 hardware have improved SOC tracking out of the box. STS has deep experience with GivEnergy systems across all generations and can determine remotely whether a SOC issue is fixable with firmware and calibration or whether it points to a hardware fault that needs a site visit.
If the SOC bug returns within days of a full calibration cycle, the issue may be hardware rather than firmware — a degraded cell, a failing BMS module, or a loose internal connection. We review your portal data, firmware version, battery health metrics, and cell-level readings remotely to determine the next step. Independent from GivEnergy and your installer.
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 £125 if we fix it, free if we don’t.
We use cookies to measure traffic and ads, sharing limited hashed data with Meta and Google. Decline keeps only essential cookies. Privacy policy