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Do-It-Yourself (DIY) Question & Answer Forum
Hello from Essex! Anyone specialist in battery storage?
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<blockquote data-quote="binky" data-source="post: 526445" data-attributes="member: 490"><p>TNCS should not be exported out of the Equipotential Zone of your house, so disconnect the earth in the garage and install a rod.</p><p></p><p>You don't want to be sharing RCd for the house with the garage - it's a bad idea at the best of times, but grid tied inverters have a requirement to shut down within 3 seconds in the event of a mains failure, RCDs are designed to shut down in milliseconds, so your RCd could trip but the inverter could still kill you! </p><p></p><p>If you are lucky you may have a consumer unit with 3 neutral bars, known as a high integrity board - move the garage MCB to the section not shared with the other circuits next to the main switch. If you havn't got one of those, then henleys and a switch-fuse is probably easier than changing the board. What I often use is a mini board with Main Switch and a MCB. Do connect the SWA earth at the house end, you still need an earth for that cable even if the earth isn't serving the shed</p><p></p><p>You could install an SPD, but that isn't mandatory until autumn this year. </p><p></p><p>RCD in garage is better not shared with the battery inverter for reasons staed above, I would replace that with a main switch and double pole RCBOs in the garage - they need to be double pole to meet requirements for TT.</p><p></p><p>You will need a comms cable for the amp clamp back in the house - mostly that is cat5 cable. I dont know why they insist on using cat5 as they only use 2 wires, but such is life <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" />.</p></blockquote><p></p>
[QUOTE="binky, post: 526445, member: 490"] TNCS should not be exported out of the Equipotential Zone of your house, so disconnect the earth in the garage and install a rod. You don't want to be sharing RCd for the house with the garage - it's a bad idea at the best of times, but grid tied inverters have a requirement to shut down within 3 seconds in the event of a mains failure, RCDs are designed to shut down in milliseconds, so your RCd could trip but the inverter could still kill you! If you are lucky you may have a consumer unit with 3 neutral bars, known as a high integrity board - move the garage MCB to the section not shared with the other circuits next to the main switch. If you havn't got one of those, then henleys and a switch-fuse is probably easier than changing the board. What I often use is a mini board with Main Switch and a MCB. Do connect the SWA earth at the house end, you still need an earth for that cable even if the earth isn't serving the shed You could install an SPD, but that isn't mandatory until autumn this year. RCD in garage is better not shared with the battery inverter for reasons staed above, I would replace that with a main switch and double pole RCBOs in the garage - they need to be double pole to meet requirements for TT. You will need a comms cable for the amp clamp back in the house - mostly that is cat5 cable. I dont know why they insist on using cat5 as they only use 2 wires, but such is life :D. [/QUOTE]
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Hello from Essex! Anyone specialist in battery storage?
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