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CT Clamp question
NoobSolar
Posts: 117
Forumite
If I already have an iboost for hot water, and I want to install a Zappi solar car charger, does it matter that it also uses a CT clamp to calculate energy?
London. 6.4kwh system, South facing. 16 Hyundai 400kw all black panels w/ optimisers, 6kw Solaredge HD Wave inverter, Solar Iboost with two immersion heaters on one 240l hw tank. Octopus Flux. Ivar 5 Wood Burning Stove. Leaf 62kwh plus Zappi. Two chickens: 1 Light Sussex, 1 Speckled Rock. Omlet walk-in run. Approx 1.5 eggs per day egg generation rate using Marriage's organic layers pellets.
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Comments
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The installation instructions usually tell you to put CT clamps a reasonable distance apart, so they don't interfere with one another.I think I've got five installed in my meter cupboard, for various reasons; three on the meter tails and two on the solar PV feed. They seem to coexist happily enough.N. Hampshire, he/him. Octopus Intelligent Go elec / Fuse gas / Vodafone BB / iD mobile. Kirk Hill Co-op member.Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs, Ecoflow Stream, Best kettle :-)
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 37 MWh generated, long-term average 2.6 Os.1 -
I have both. I get the impression that whichever device first sees the surplus energy it will take it. Usually the IBoost wins.Northern Lincolnshire. 7.8 kWp system, (4.2 kWwest facing panels , 3.6 kWeast facing), Solis inverters installed 2018, 5kW SSE facing system (shaded in afternoon) added in 2025 with Tesla PW3 battery, Mitsubishi SRK35ZS-S and SRK20ZS-S Wall Mounted A2A Heat Pumps, ex Nissan Leaf owner.0
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Ct clamps are generally happy close together, but I like to keep them separated by a few cm's, putting tie wraps round the cable and leaving the tail on will stop the ct clamp sliding by itWest central Scotland
4kw sse since 2014 and 6.6kw wsw / ene split since 2019
24kwh leaf, 75Kwh Tesla and Lux 3600 with 60Kwh storage0 -
No problems having clamps close together.For compatibility the Zappi requires an extra ct clamp to measure and account for diverters and/or AC battery charging and thus you can prioritise car charging over boost diverters/chargers in times of excess generation. Full details in the manual supplied at installation or via tgat on the Myenergi website.That's how my system works....very well.0
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