Performance guide · GivEnergy battery

GivEnergy Battery Performance in Cold Weather — Explained

Q: Why won't my GivEnergy battery charge when it's cold?

GivEnergy batteries use lithium chemistry that cannot safely accept a charge when the internal cell temperature drops below 0°C. This is a built-in BMS protection feature, not a fault. The battery will still discharge (power your home) down to approximately −1°C, but charging is paused to prevent cell damage from lithium plating. Check the internal battery temperature in the portal (Power graph > Battery Temperature). Once the cells warm above 0°C — either from household heat, solar activity, or a short grid charge — normal charging resumes automatically.

Q: My GivEnergy battery seems to have less capacity in winter — is it broken?

No — this is normal cold weather behaviour for all lithium batteries. At around 5°C internal temperature, GivEnergy batteries can show up to 10% temporary capacity reduction. The capacity fully recovers as the battery warms up. If you're noticing significantly more than 10% reduction, or the capacity doesn't recover on warmer days, it may indicate genuine capacity degradation rather than cold weather effect — in that case, contact your installer or STS for a diagnostic.

Q: How do I stop my GivEnergy battery from getting too cold overnight?

The most effective method is to schedule your off-peak charge so it finishes just before the window closes rather than finishing early. Charging generates heat inside the cells, and a battery that finishes charging at 2am and sits idle for three hours will cool significantly before morning. Spreading the charge rate across most of the cheap window — for AIO systems, 3.8–4.2 kW over 6 hours — maintains warmth better than a high-rate charge that finishes in 2 hours. For batteries in external enclosures or unheated garages, simple insulation around the unit (maintaining ventilation clearances) significantly reduces temperature drop overnight.

Q: What temperature is too cold for a GivEnergy battery?

The key thresholds for GivEnergy batteries based on internal cell temperature are: below 0°C — charging is inhibited (discharge still works to about −1°C); around 5°C — up to 10% temporary capacity reduction; around 10°C — mild efficiency drop begins. Note these are internal battery temperatures, not outdoor or room temperatures. A battery in an unheated external enclosure can reach 0°C internally even when the outdoor temperature is 3–5°C, because of overnight cooling. Check the Battery Temperature graph in the portal to see the actual internal reading.

GivEnergy batteries charge less efficiently and hold less usable capacity when cold. Below 0°C, the BMS pauses charging entirely to protect the cells. This is normal — but it can look like a serious fault if you don't know what to expect. This guide explains the temperature thresholds, what's normal vs what needs attention, and how to configure your system for winter.

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Covers Hybrid and AIO models
Includes winter schedule optimisation
Normal behaviour vs genuine fault explained

Battery not charging on cold mornings?

Cold weather charging issues are almost always configuration — not hardware. The portal temperature graph tells us exactly which threshold is being hit and when. We review this remotely and advise on the right winter schedule.

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13 Trustpilot reviews

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I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

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

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

Ian · May 2026 Trustpilot

Sree · May 2026 Trustpilot

Dennis Brown · May 2026 Trustpilot

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Mr Machin · May 2026 Trustpilot

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Christopher · Apr 2026 Trustpilot

customer · Apr 2026 Trustpilot

Andy Thomas · Apr 2026 Trustpilot

Philip · Apr 2026 Trustpilot

Overview Not Discharging Not Charging Settings Changing Tariff Lockout CAN Fault Charge Schedule App Guide Full Restart Calibration Cold Weather Grid Usage

Temperature thresholds

Internal battery temperature thresholds

All thresholds below apply to the internal cell temperature — not the outdoor or room temperature.

ℹ

Internal temperature — not outdoor temperature. A battery in an unheated external enclosure or garage can be 5–10°C colder than the ambient air overnight. Always check the portal's Battery Temperature graph to see the actual reading — don't assume based on the weather forecast.

🌡️

~10°C

Mild efficiency drop begins

Small reduction in charge/discharge efficiency. Not usually noticeable in day-to-day operation. System functions normally.

Verdict: Normal — no action needed

❄️

~5°C

Up to 10% capacity reduction

Temporary reduction in usable capacity — the battery appears to run out faster than usual. This recovers fully as the cells warm up.

Verdict: Normal — adjust winter schedule

🚫

Below 0°C

Charging inhibited by BMS

The BMS pauses charging to prevent lithium plating damage. Discharge still works to about −1°C. This is protection, not a fault.

Verdict: Expected — see fixes below

⚠

GivEnergy batteries have no active internal heating. Unlike some EV batteries, GivEnergy battery packs don't have built-in heaters. Warmth comes only from charge and discharge activity. This means a battery that has been idle all night in a cold location may need a short period of charging to warm up before it can accept a full charge — which is why winter schedule timing matters.

Diagnose

How to Check Battery Temperature in the Portal

Before adjusting anything, confirm what the internal temperature actually is. This rules out other issues and tells you exactly which threshold your battery is hitting.

The temperature graph is available on the portal — some versions of the mobile app also show it, but the portal has the most complete history. Select your inverter from the dashboard.

Open the Power graph and enable Battery Temperature

In the Power graph view, click the series selector and enable Battery Temperature. Alternatively, tap the battery icon in the app → More Information → per-battery details (availability varies by model and firmware).

View the last 24–48 hours and correlate with behaviour

Look for the overnight temperature pattern. If the temperature dips below 5°C between 3am and 6am — after the charge finishes but before morning consumption — that's the cold-soak window causing the problem. If it drops below 0°C, charging would have been inhibited at that point.

Check the charge completion time vs the temperature dip

Compare when overnight charging completed (SoC reaching your target) with when the temperature started dropping. If there's a 3–4 hour gap between charge completion and morning use, the battery is cooling down significantly during that idle window. The fix is to push the charge start time later so it finishes closer to when you need the battery.

Winter fixes

Fix

Cold Weather Fixes — by Symptom

🚫 Battery won't charge on cold mornings (below 0°C internally)

The BMS is protecting the cells from damage — charging below 0°C can cause lithium plating which permanently reduces capacity. This is expected behaviour, not a fault.

→

Schedule a short grid charge earlier in the night to gently warm the cells. Even 30–60 minutes of gentle charging will raise the internal temperature above 0°C, after which the full charge window will complete normally.

→

Set your charge window to start shortly before off-peak begins — even a short high-rate discharge before the charge window briefly warms the cells, making the subsequent charge more efficient.

→

Once the internal temperature climbs above 0°C, the BMS will resume charging automatically — no manual intervention needed.

❄️ Noticeable capacity reduction (~5°C internally)

Up to 10% temporary capacity reduction is normal at 5°C. The capacity returns when the battery warms up. You can reduce the impact by keeping the battery warmer through the night.

→

Extend overnight charging to spread across more of the cheap window — a longer charging period at a moderate rate (3.8–4.2 kW for AIO) keeps cells warmer for longer and finishes closer to morning use.

→

Avoid fully charging early then leaving the battery idle for hours — a battery that hits 100% at midnight then sits cold until 7am will cool significantly and the capacity reduction will be more pronounced.

→

Adding a small additional grid charge during daytime (e.g. 1 kWh extra midday on cold days) compensates for the capacity reduction cheaply — the cost is typically a few pence.

☀️ Solar-only setup in winter — poor daytime performance

Systems that rely solely on solar in winter often suffer from cold soak — the battery charges slowly from low solar generation, never fully warms up, and underperforms all day.

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Add a nightly grid top-up — even 2–3 hours of overnight charging at a modest rate provides warmth and a useful reserve. The cost is typically tens of pence per night on an off-peak tariff and is usually more than offset by improved daytime performance.

→

Allow the battery to discharge gradually through the day rather than staying at a high SoC waiting for solar — discharge activity keeps cells warmer than sitting idle.

Winter schedule

Winter Schedule

Optimising Your Schedule for Winter

The right winter schedule keeps cells warm, maximises usable capacity and makes full use of your cheap tariff window. Charge across most of the off-peak window rather than blasting at full power and finishing early.

❌ Less effective — winter schedule

Charge start: 00:00

Charge end: 02:30

Rate: 5 kW (max)

Target SoC: 100%

Battery hits 100% at 02:30. Sits cold and idle until 06:30 morning use. By 07:00 the internal temp may be 3–5°C lower than when charging finished.

✓ Better for winter

Charge start: 00:00

Charge end: 05:00

Rate: 3.8–4.2 kW (AIO optimal)

Target SoC: 100%

Charging spread across the window. Battery reaches 100% closer to 05:00. Much warmer when morning consumption starts at 06:30–07:00. For AIO systems, GivEnergy recommends 3.8–4.2 kW during cold months — this rate fills most of the cheap window without finishing too early, keeping cells warm through the morning.

Winter Battery Management — automatic cold protection

Some GivEnergy firmware versions include a Winter Battery Management feature that monitors internal temperature and automatically triggers short 30-minute charge cycles when the temperature drops below approximately 2°C. This keeps the cells warm without overcharging.

→

Check: givenergy.cloud → My Inverter → Settings → Battery Management. If this option is available for your model, enable it for the winter months. It is typically only available from certain firmware versions — if you don't see it, check for a firmware update first.

Placement

Placement and insulation tips

✓ Better locations

• Internal garage wall (attached to house)

• Utility room or plant room

• Indoor cupboard with adequate ventilation

• Any location that stays above 5°C overnight

⚠ Challenging locations

• Detached garage with no heating

• External wall of unheated outbuilding

• External enclosure exposed to overnight wind

• North-facing external wall in shade

Insulating external enclosures

If the battery is mounted in an external enclosure, simple insulation significantly reduces overnight temperature drop. GivEnergy's guidance: add insulation to reduce heat loss, but always maintain the ventilation clearances specified in the installation manual and avoid trapping moisture. A basic insulated cover that doesn't block the vents can make a meaningful difference without voiding warranty or creating a fire risk.

Note: Relocating an existing installation requires a qualified MCS-certified installer. If cold weather is causing persistent problems that winter schedule adjustments don't solve, relocation to a warmer location may be worth considering.

When to call STS

Cold weather vs genuine fault — how to tell the difference

Normal cold weather behaviour:

• Charging paused when internal temp is below 0°C

• Up to 10% capacity reduction at ~5°C

• Capacity fully recovers on warmer days

• Battery Temperature graph shows low temp correlating with reduced performance

• Charging resumes automatically once cells warm above 0°C

Get in touch if:

• Charging is inhibited even when internal temp is well above 0°C

• Capacity loss is more than ~10% and doesn't recover when warm

• Battery temperature telemetry is missing or inconsistent in the portal

• Charging doesn't resume after the battery warms up naturally

• Fault codes appear in the event log during cold periods

Related guides

Related GivEnergy guides

Problem

Battery Not Charging Overnight

If the battery didn't charge on a cold night, this guide covers all causes — including cold inhibition and schedule issues

Configuration

Charge Schedule Setup

Full guide to setting winter schedules — timings, tariff-specific slots and the midnight boundary rule

Setup

Battery Calibration

If capacity still seems low after warming up, calibration drift may be a factor alongside the cold weather effect

Problem

Battery Not Discharging

Reserve SoC, mode and schedule causes for a battery that won't power the home in winter

Setup

GivEnergy App Guide

How to access Battery Temperature history and monitor cold weather performance through the app and portal

GivEnergy

GivEnergy Hub

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

Battery not charging — all brands

Related GivEnergy pages

🔋

Battery Not Charging Overnight

Diagnosis and fixes for overnight charging failures

⚡

Battery Calibration

How to calibrate battery state of charge

🔧

Hardware Diagnostics

Guide to running system diagnostics

📋

All GivEnergy Problems

Complete problem-solving guide index

FAQ

Frequently asked questions

Why won't my GivEnergy battery charge when it's cold?

When the internal cell temperature drops below 0°C, the BMS pauses charging to prevent lithium plating — a form of damage that permanently reduces capacity. This is built-in protection, not a fault. Discharge still works at these temperatures. Check the Battery Temperature graph in the portal (Power graph → Battery Temperature) to confirm that's what's happening. Once the cells warm above 0°C — from household heat, a short discharge period, or by scheduling the charge to start when the battery is slightly warmer — normal charging resumes automatically.

My GivEnergy battery seems to have less capacity in winter — is it broken?

Very likely not broken — at around 5°C internal temperature, GivEnergy batteries show up to 10% temporary capacity reduction. This fully recovers as the cells warm up. If the apparent capacity loss is more than 10%, or if it doesn't recover on warmer days, it may indicate genuine capacity degradation rather than cold weather effect — in that case contact your installer or STS for a diagnostic. Checking the Battery Temperature graph and correlating it with the day's performance is the best way to tell the difference.

How do I stop my GivEnergy battery from getting too cold overnight?

The most effective approach is to spread overnight charging across most of your cheap tariff window rather than finishing early. For AIO systems, the official GivEnergy recommendation is 3.8–4.2 kW for a charge that spans most of the window. A battery that finishes charging at 2am and sits idle until 7am will cool significantly. Set the charge rate so it completes just before the window closes — the warmth from charging will carry through to morning consumption. For batteries in external or cold locations, a simple insulated cover (maintaining the required ventilation clearances) also helps significantly.

What temperature is too cold for a GivEnergy battery?

The key thresholds based on internal cell temperature: below 0°C — charging inhibited (discharge allowed to about −1°C); around 5°C — up to 10% temporary capacity reduction; around 10°C — mild efficiency drop. Remember these are internal temperatures, not outdoor or room temperatures. A battery in an unheated garage can reach 0°C internally even when it's 3–5°C outside, because of overnight cooling from the enclosure and wind chill on external surfaces. Always check the Battery Temperature graph in the portal for the actual internal reading rather than estimating from the weather.

Get help

Still having cold weather charging problems?

If the battery is still inhibited when the temperature is well above 0°C, or capacity isn't recovering when it warms up, it may need investigation. Tell us what's happening and we'll help figure out whether it's a configuration issue or something that needs a site visit.

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Cold weather issues usually don't need a site visit

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