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  1. D

    Solar PV earthing earth rod or main earthing terminal in house

    Thank you, that was my understanding. My confusion comes from a discussion on a Facebook group discussing how to install a manual EPS switch for an AC battery inverter. The EPS requires a TT island yet it seems people are installing 2 pole switches ie inverter (TT) earth and main earth are...
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    Solar PV earthing earth rod or main earthing terminal in house

    I'd welcome clarification about whether a TT island is truly an 'island' separate from house supply earth I have a Zappi 1 and as far as I recall the earth was run by the installer solely to the earth rods. I don't recall the earth from the CU being connected. Not home so can't check. Maybe...
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    Surge Protection Advice

    Yes missing comma!! Thankyou. By the time I've covered off 3 CUs I don't think there will be much in it cost-wise. Maybe even cheaper by the time labour factored in.
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    Surge Protection Advice

    Typical suburbia. No underground cabling and no specific lightning protection
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    Surge Protection Advice

    Let me say from the off that although I'm electrically competent I'll be getting a professional in to do the work. I just like to know the answers before I ask professionals questions! So I have a 100A single phase domestic supply feeding the house CUs as well as a CU for an EV charger. One of...
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    How do you "pair" a Zappi and a Solar/Battery system?

    I've come here looking for the same advice (wanting to install battery storage). The MyEnergi forum on Tapatalk looks like it might be another place to look. https://myenergi.info/battery-storage-f57/
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    Currys refused to install my daughter's cooker, but....

    I don't know where the Currys guy measured but I measured between phase and neutral. I'll do a more thorough check, including cpc, tomorrow when I have more time and better light. Thanks to all for your input.
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    Currys refused to install my daughter's cooker, but....

    Today my daughter received her replacement built-in oven from Currys. She'd paid for connection and disposal. I got a call from her saying that the Currys guys had refused to install it because they had measured the voltage at the connector block at the rear of the old oven at 117V. This is the...
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    Immersion Heater - PV electricity

    Thanks guys. pmcalli, hope you dont mind but I pm'd you with a more detailed series of queries as I think you've done what I next need to do on my project
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    Immersion Heater - PV electricity

    I've been out of this thread for a few months while I followed the Nanode-based control solution that was discussed in earlier posts. I have done the assembly and mimicking and am about to connect to the 5V version of the same controller - MCPC2450A pmcalli, do you have the output filtered? If...
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    Smart Control of appliances with Solar PV & Bluetooth

    Bit of overlap with this thread. Not bluetooth but might be worth a read. http://www.electriciansforums.net/central-heating-systems/23969-immersion-heater-pv-electricity.html
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    Immersion Heater - PV electricity

    I'm pondering the best/easiest/most cost-effective route to inputting real time data into whatever microprocessor does the clever stuff (probably Arduino/Nanode). The LEM CTs look expensive but I'm sure they are wonderful. Anyone have any experience of Efergy units (cheap on Ebay) but at 90A...
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    Immersion Heater - PV electricity

    Taken a look. Its a burst fire controller, not a proportional controller. quote "This device regulates the speed of an on/off pulse. Provides a smooth proportional control that minimizes electrical noise by utilizing zero-cross detection and switching, firing only complete AC cycles...
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    Immersion Heater - PV electricity

    Methley, have you successfully got the Crydom working via PWM and filter? Crydom advised me "The analogue DC input is sensed by a micro-controller, a PWM input would either not be recognized or falsely interpreted. The PWM signal would have to be converted to DC signal." which led me to doubt...
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    Immersion Heater - PV electricity

    I've been working my way through this thread for days. Really interesting and a credit to the contributors. Its taken days because I'm a chartered (mech) eng so can only deal with things that can be measured in buckets. No, I've 16th Ed and did hobby electronics years ago so I think I have...
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    How much Seasonable Variation to expect?

    Whoops - yeah its 16 - miscounted, duh. Its a 30 deg roof so fairly optimal I reckon. Noticed this morning a factor of 3 between the currents of the 2 arrays up to 11am which I think has to be shadow from TV aerial. Just moved it so interested to see if better output tomorrow morning. After...
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    How much Seasonable Variation to expect?

    6 weeks ago I had 24 x Sanyo 240w panels and SMA 4000TL fitted to a S facing roof without shade. For a few days after, the sun shone very occasionally and at these times I regularly saw over 3kw being generated and peaks of 4.2kW on the screen of the Sunny Boy. Daily yields averaged 13.7kw for...
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    One string suddenly seems to have reduced output

    Oh yeah. 2x8. When commissioned & over the weekend everything seemed to be balanced whenever I checked. Seems to be a marked difference only this afternoon. Maybe because its first afternoon there's been loads of sun but 3x difference just seemed excessive.
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    One string suddenly seems to have reduced output

    There is a handrail on the scaffolding parallel with the line of the eve. This means that in the afternoon 3 PV panels have a neat line of shadow down their length about the width of an 'element'. Some other scaffold poles casting a little diagonal shadow, otherwise nothing. Will be amazed if...
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    One string suddenly seems to have reduced output

    On my newly commissioned system - 16x Sanyo HIT240 and SMA 4000TL - all has been going well, even to the extent of seeing over 4kW on the inverter dispay a couple of times yesterday and this morning. This afternoon, in good sunlight, I notice one of the strings will never get above 1.8A (about...

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