We diagnose LVD trips remotely — checking your threshold settings, voltage sag under load, battery temperature, and daily energy balance to find the root cause and recommend the fix.
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What a fantastic service. Had my fault diagnosed within minutes and actually managed to resolve the issue remotely within a few minutes more. This guy is like a “Solar Batman” helping consumers fix their problems using his extensive industry knowledge and expertise. Outstanding service. Thank you so much.
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The low voltage disconnect exists to prevent battery over-discharge. The problem is either that it is triggering when it shouldn't (wrong threshold or voltage sag), or that it is triggering correctly because the battery genuinely doesn't have enough capacity for the load. Diagnosing which of these applies determines the fix.
UK peak sun hours drop from 4–5 per day in summer to 1.5–2.5 per day in December and January — and low sun angles mean the first and last hours of generation are marginal.
Batteries in unheated outbuildings or sheds can drop to 5–10°C, reducing usable capacity by 15–20% and increasing internal resistance so that voltage sag is worse under the same load.
Compare your LVD setting against the correct value for your battery chemistry:
If the controller is set to a sealed lead-acid profile but you have lithium, the LVD will be set to the SLA value — which may be too high for LiFePO4. Switch to a custom profile and set LVD manually from the battery manufacturer's specification sheet.
Voltage sag is the most misdiagnosed cause of LVD trips. The battery has capacity remaining, but the terminal voltage drops below LVD under load:
Use the MPPT monitoring app, VRM (Victron), or a multimeter to read battery voltage during a load event. Note the voltage at the moment of disconnection.
If the voltage immediately recovers to a healthy level (e.g. jumps from 47V back to 51V the moment loads disconnect), the battery had capacity — the sag triggered LVD, not genuine depletion.
A well-sized battery bank should sag less than 2V under normal load. Sag of 3–5V under a 3kW load on a small 5kWh bank is common and means the bank is too small for that load.
VRM shows a detailed battery voltage graph — look for sharp dips at the time of LVD events in the advanced history section.
Identify which load is active when LVD trips occur. High-current loads cause the most pronounced sag:
Running a kettle and washing machine simultaneously on a small battery bank is a common LVD trigger. Stagger high-draw appliances or run them only during solar hours when the MPPT is also contributing current.
LiFePO4 capacity and internal resistance are both affected by temperature. A battery in an unheated space in winter is effectively smaller than its nameplate rating:
If LVD trips are concentrated in winter or at night, check the battery temperature. Insulating the battery enclosure or moving it to a heated space can recover 15–20% of winter capacity loss. See our cold weather battery guide for more detail.
If LVD trips frequently regardless of season or threshold setting, the battery bank is too small for the daily load. Use this sizing check:
Most lithium systems allow stacking additional modules — check battery compatibility list for parallel limits.
Swap resistance heating for heat pump alternatives. Replace incandescent or halogen with LED. Move washing to solar peak hours.
A generator backup charge input allows the battery to be topped up during sustained low-solar periods rather than relying on the battery alone.
Tell us your battery voltage at the point of disconnection, your LVD threshold setting, and what loads were running. We'll identify whether it's a settings issue, voltage sag, or a sizing problem.
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.
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