EPS setup on GivEnergy varies between Gen 1, Gen 2, Gen 3, and All-in-One models. Whether your system has a wired EPS circuit, what the SoC minimum should be set to, and which portal settings apply — we can review and configure this remotely.
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Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
EPS (Emergency Power Supply) is GivEnergy's battery backup function. Understanding exactly how it works is essential before diagnosing why it failed.
When the grid fails, GivEnergy's EPS mode switches the dedicated EPS output terminals from grid power to battery power within approximately 20ms. Only circuits wired to those specific terminals receive backup power.
The main consumer unit and all sockets and lights not wired to the EPS circuit remain off during a grid outage. EPS is for essential circuits only — typically a few key sockets, boiler, or lights selected at installation.
EPS requires: (1) a dedicated EPS output circuit physically wired by the installer to the inverter's backup terminals, AND (2) EPS mode enabled in the GivEnergy portal. Missing either one means no backup power.
EPS is disabled by default on every GivEnergy inverter. It must be explicitly enabled in the GivEnergy portal. This is the most common reason backup power doesn't work — the physical wiring is correct but the inverter has never been told to use it.
Go to givenergy.cloud → My Inverter → System Mode Settings.
EPS settings are typically found in the System Mode Settings or Advanced Settings section depending on your portal version. Look for a toggle or option labelled EPS, Emergency Power Supply, or Backup. If it is set to Off or Disabled, this is your problem.
GivEnergy firmware updates can reset settings including EPS mode back to defaults. If EPS was working and then stopped after an update, check whether the setting has reverted to disabled.
Even if EPS mode is enabled in the portal, backup power only reaches circuits that are physically wired to the inverter's EPS output terminals. Many UK GivEnergy installations do not include this wiring — it is an optional additional cost that many installers don't include as standard.
Adding an EPS circuit is an electrical installation job. A qualified electrician or GivEnergy-experienced engineer runs a dedicated circuit from the inverter's EPS output terminals to a sub-board or specific sockets and circuits that you want backed up.
You need to decide which loads to back up — common choices are a key socket, the boiler, fridge, and critical lighting. The total load must not exceed the inverter's EPS output rating (typically 3kW on Gen 2, 6kW on Gen 3 and AIO).
This is a notifiable electrical installation and should be done by a Part P registered electrician or a qualified solar engineer.
GivEnergy EPS will not activate if the battery state of charge is at or below the EPS reserve threshold. If the outage happened at night after a long discharge period, or the battery has been undercharging due to a separate fault, EPS may have had nothing to draw from.
In the GivEnergy portal, navigate to the battery SoC graph and look at what the SoC reading was at the time the outage occurred. If the battery was at or near the reserve minimum (or at 0%), EPS had insufficient charge to operate.
The EPS reserve setting is typically in Battery Options under the minimum SoC or reserve percentage. Check what this is set to — if the battery was above this at the time of the outage but EPS still didn't work, the SoC is not the cause.
The EPS reserve (minimum SoC) determines how much battery charge is held back specifically for backup power. Setting it too low means EPS may be unavailable when you need it. Setting it too high means less battery capacity for daily use.
EPS activated but then cut out within seconds. The total power draw on the EPS circuit exceeded the inverter's backup power rating, triggering the overload protection. This produces the fault code STORAGE_ERROR_BACKUP_OVERLOAD_FAULT.
Ratings vary by inverter model. Always verify against your specific model's datasheet before sizing an EPS circuit.
STORAGE_ERROR_BACKUP_OVERLOAD_FAULTCheck the portal event log for this code — if present, the load on the EPS circuit exceeded the inverter's backup power rating.Total load on the EPS circuit must not exceed the inverter backup rating. Account for startup surges — motor-driven loads like fridges draw 2–3× their running wattage for 1–2 seconds on startup.
Before enabling EPS in the portal, confirm that a dedicated EPS output circuit was physically wired at installation. Enabling EPS without the correct wiring has no effect — it will not provide backup power and may cause unexpected behaviour.
EPS setup checklist
Verify with your installer documentation or by visually checking the consumer unit for a dedicated EPS/backup circuit. If not installed, contact a qualified engineer to add one before proceeding.
Go to givenergy.cloud → My Inverter → System Mode Settings. Find the EPS or backup power setting and enable it. Press Submit to apply. The exact label and location varies between portal versions — it may be under Battery Options or Advanced Settings on some models.
Under Battery Options, set the minimum SoC reserve to the level that gives you your desired backup duration. A 20–30% reserve is a reasonable starting point for most households. This is the charge held back exclusively for EPS use.
To test EPS without a real power cut, you can turn off the main AC isolator below the inverter while the battery is charged and EPS is enabled. The EPS circuit should remain powered from the battery. Only do this if you understand what you are doing — turning off the AC isolator isolates the inverter from the grid. Restore it promptly. Do not turn off the consumer unit main switch as this may disconnect EPS loads.
Some appliances are sensitive to the ~20ms switching time when EPS activates. Computers, NAS devices, and some boiler controls may restart during the brief switchover even when EPS is working correctly. This is not an EPS fault — it's a limitation of the technology. A UPS (uninterruptible power supply) on sensitive equipment can bridge this gap.
During EPS operation, the inverter status light behaviour changes — the inverter is no longer connected to the grid and operates in island mode. This is normal. If the battery depletes fully during EPS and the grid is still down, all power will be cut. The inverter will restart automatically when grid power returns.
Battery not charging overnight — low SoC means less EPS reserve too.
Battery fault codes including EPS overload and protection events.
Firmware updates that reset EPS mode or other system settings.
Browse all GivEnergy fault guides — battery, portal, CAN, firmware and more.
This is a brand-specific version of our general no backup during power cut guide, which covers all brands.
Tell us whether you had EPS wiring at installation, what the battery was showing at the time of the outage, and what the portal settings look like. We'll identify the cause and configure EPS correctly for your system.
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 £75 if we fix it, free if we don’t.
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