We diagnose cold-weather battery issues remotely — LVD trips, charge cutoff, capacity shortfall — and advise on the most cost-effective thermal management solution for your installation.
Book your free diagnostic callAll guidesSuper support. Delighted I found them. System battery was down for quite a while and no one would try to fix it as GivEnergy out of business. A few hours later and I’m up and running again. Brilliant service!!! Highly recommend them.
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
We have a GivEnergy system, both GivEnergy and our installer have gone bust! Ron was able to remotely log in to our system and sort the issue within about 30mins. Would definitely recommend and will be using in future
Superb work from Ronald. Cannot recommend highly enough. Figured out my problem late into night, going above and beyond! Many thanks to him
I received a prompt response and excellent technical support for the remote diagnosis (Oxfordshire) and resolution of my GivEnergy EMS configuration. My GivEnergy issue involved a single inverter and battery that had a loss of calibration, a critical low voltage drop. It needed a recovery and re-calibration, and was supported via email into yesterday evening being resolved within 24 hours. Ron demonstrated a very high level of knowledge and experience in the intricacies of a GivEnergy EMS configuration, even surpassing the understanding of GivEnergy itself when it was still operational. I have already recommended their services to a neighbour as I’d be happy to use their services again based on the fair pricing and the quality of their support.
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.
Battery manufacturers rate capacity at 25°C. Real-world UK winter conditions are much colder than this — especially in unheated outbuildings.
A 10kWh battery bank in a 5°C outbuilding delivers approximately 8–8.8kWh of usable energy — 12–20% less than the nameplate rating. Add this cold-weather derating to any system sizing calculation. See our off-grid system sizing guide for the full calculation including winter generation figures.
The BMS blocking charge current in cold weather is not a fault — it is a critical safety protection.
When a lithium-ion cell (including LiFePO4) is charged below 0°C, lithium ions cannot intercalate properly into the graphite anode. Instead, they plate out as metallic lithium on the anode surface. This causes:
If your MPPT controller shows zero charge current on a cold morning in bright sunshine, do not attempt to reconfigure or override the BMS. The battery will resume accepting charge once cell temperature rises above 0°C — usually within 1–2 hours of the sun warming the enclosure or the battery self-heating from discharge activity.
Cold temperatures increase battery internal resistance — this is the hidden cause of many winter LVD trips.
Internal resistance (Ri) increases significantly at low temperatures. Higher Ri means more voltage is dropped internally when current flows:
If the LVD threshold is set to 46V, the 0°C example would trip the disconnect even though the battery still has capacity. The terminal voltage recovers to 51V the moment the load disconnects, confirming the battery was not depleted — it was cold. See our low voltage disconnect guide for diagnosis steps.
Ordered from lowest to highest cost — most installations benefit most from combining insulation and modest active heating.
50–100mm of PIR board or rockwool around a battery box significantly slows heat loss. A battery that self-heats to 15°C during afternoon discharge will retain that heat overnight if well-insulated. Cost: £20–80 of materials. Alone, this may not maintain temperature above 0°C during a prolonged UK cold snap, but it dramatically reduces the depth of temperature swings.
A silicone heating pad with a thermostat controller maintains minimum temperature, typically drawing 30–100W when active. Set the thermostat to activate at 5°C and turn off at 15°C. Annual energy cost for a typical UK winter is 10–30kWh — modest against the performance benefit. Cost: £30–120 depending on capacity. Works best combined with enclosure insulation.
The most effective thermal management is keeping the battery in a heated space — utility room, garage with heating, or purpose-built insulated room. LiFePO4 batteries rated for indoor installation typically carry IP55 or higher ratings and are safe for habitable spaces. Check with your battery manufacturer and local building control if installing inside a dwelling — ventilation requirements may apply.
Some premium batteries — including select BYD HVS configurations and some Dyness Tower Pro variants — include integrated cell-level heating elements controlled by the BMS. These maintain minimum cell temperature for charging even in sub-zero ambient conditions. The heating is powered from the battery itself and activates automatically. This is the most reliable solution for remote installations where external heating is impractical, but adds significant cost.
Several parameters benefit from seasonal adjustment to account for reduced generation and cold battery performance.
Reduce by 1–2V to account for increased voltage sag. If summer LVD was 46V on a 48V system, set it to 44–45V in winter. This prevents nuisance trips from sag while still protecting against genuine deep discharge.
Victron ESS: raise minimum discharge SoC from a summer 10% to a winter 20–25%. This maintains more reserve buffer for consecutive cloudy days where both charging and available capacity are reduced.
For systems with generator backup, raise the auto-start SoC from a summer 20% to a winter 35–40%. Starting the generator earlier in winter prevents the battery from reaching the cold-temperature voltage sag zone under load.
If using Victron Cerbo GX with DVCC, the BMS will automatically reduce the charge current limit (CCL) in cold conditions. This is normal behaviour — the BMS is protecting the cells. Do not override the DVCC current limit manually in cold weather.
Tell us your battery type, installation location, and the symptoms you're seeing. We'll identify whether it's a temperature, settings, or sizing issue and recommend the most cost-effective fix.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
Every message is read and answered, so please don’t send it twice; that only slows the queue.
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