If you're dealing with a fault related to this topic, a remote diagnostic identifies the root cause and recommends the fix — usually within 30 minutes. All major brands supported.
Book your free diagnosticHow diagnostics workBrilliant 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.
A CT clamp is a sensor that measures electrical current. It is not connected directly to the power line — it clamps around the cable and measures magnetically. Here is how it works.
A split-core CT clamp looks like a small hinged metal ring (usually split into two halves). The ring opens, clamps around an AC power cable, and closes. A cable is passed through the ring's centre without any electrical connection — it is purely magnetic coupling.
When AC current flows through a cable, it creates a varying magnetic field around the cable. The CT clamp's coil detects this changing field and produces a proportional voltage signal. This signal is sent to the inverter's input terminal (usually a 3.5mm jack or connector).
Unlike measuring voltage or resistance, CT clamps do not require cutting or splicing the power cable. They clamp around an existing cable and extract measurement data. This makes them safe for retrofit installations and post-commissioning diagnostics.
Different installations use CT clamps at different locations. Each location serves a specific purpose.
Clamped around the main cable from the electricity meter to the consumer unit. Measures how much power flows in (import) and out (export) of your property. The inverter uses this to:
Clamped around the battery inverter's AC output cable (or DC cables on DC-coupled systems). Measures how much current is flowing in (charge) or out (discharge) of the battery. Used for:
In some larger systems, a CT clamp is installed on the cable from the solar combiner box to the inverter to directly measure panel output. Most systems instead calculate generation from battery charge + load + export, so a dedicated solar CT is not always fitted.
CT clamps are directional. Install one backwards and readings invert — imports become exports, battery won't charge, and the system becomes confused.
A CT clamp is marked with an arrow or P1/P2 labels indicating the intended direction of current measurement. Current flowing in the marked direction produces a positive voltage. Current in the opposite direction produces a negative voltage.
The inverter interprets this: positive = import, negative = export (or vice versa depending on how the system is programmed).
A reversed grid CT clamp inverts all readings:
A reversed battery CT clamp inverts charge/discharge signals:
"Battery won't charge" is often the first symptom that alerts you to a reversed battery CT.
Simple, non-invasive test that takes 3 minutes and requires only a kettle and your inverter app.
Open your inverter app on your phone or log into the web portal. Navigate to the "Power" or "Flow" page that shows import/export readings in real-time. Write down or screenshot the current reading (e.g., "240 W import").
Switch on an electric kettle, shower, or oven. The goal is to create a sudden 2,000+ watt load that is not being met by solar.
The import reading should increase significantly (e.g., "240 W" → "2,500 W"). This indicates the system is drawing power from the grid to feed the kettle — the CT clamp correctly measures this as import.
If turning on a 2 kW load causes the export reading to increase, the grid CT clamp is installed backwards. The system is seeing the increased load as export, which is impossible — you cannot export more power than the solar is generating.
Switch off the kettle. The import reading should drop back to near the original value (give it 10 seconds to update). This confirms the CT clamp is responding to real load changes — not a one-time glitch.
If your system has battery and the grid CT test passed, check the battery CT clamp separately:
UK residential supplies come in single-phase or three-phase. CT clamp configuration depends on this.
A typical UK residential property has a single-phase supply (230V AC, one live wire, one neutral, one earth). Most solar systems use one CT clamp on the main import/export cable. If the system has battery, a second CT clamp measures battery current.
A single CT clamp on a single-phase supply measures 100% of the power flow to/from your property.
Three-phase supplies have three live wires (phases A, B, C), each 230V to neutral. Most three-phase solar systems install one CT clamp per phase (three total) to measure the total power flow across all phases.
If a system has only one CT clamp on a three-phase supply, it measures only 33% of the power flow. Generation/import figures appear 30% low.
In some battery installations, CT clamps are installed on individual circuits (e.g., one on the essential loads circuit, one on the general circuit, one on the battery). This allows the inverter to prioritize battery discharge to essential circuits during a power cut (Emergency Power Supply mode).
If you have a split-load battery system, verify the installer fitted a CT clamp on each monitored circuit — missing clamps cause incomplete load measurement.
How your DNO sets an export limit and why your CT clamp is essential to enforcing it correctly.
Battery chemistry, BMS, and why a reversed CT clamp causes overnight charging to fail.
How the inverter uses CT clamp data to manage self-consumption, battery, and export.
Step-by-step diagnosis to confirm a reversed or mispositioned CT clamp and what to do next.
Diagnosis for batteries that won't charge overnight — CT clamp issues are a leading cause.
What your installer should have verified on the day — including CT clamp orientation testing.
Why one CT clamp isn't enough on a 3-phase supply, and the four topologies UK installers use — with animated diagrams.
If the kettle test reveals a reversed CT clamp, or battery charging isn’t working as expected, a remote diagnostic identifies the cause and resolves it — usually in a single 30-minute session.
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