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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentTimeApr 22nd 2021
    It sounds like these things do something I don't want. What I want is something that masks short outages completely, so that I don't have to walk around the house afterwards resetting all the stupid clocks and so my computers don't reboot and los their state, and my TV recorder etc etc. I don't mind if everything goes down after a longer outage; that's what will happen in a very long outage anyway.

    It's exactly the dropouts caused by short-duration automatic network switchovers that are my problem here. We get far more of them than I've ever seen before and I find them a real nuisance.

    I don't think the suggestions about the behaviour can be quite right. Whatever system already knows the phase of the mains at the time the power goes down. It has to for microgeneration to work. And it causes a lot more inrush current and weird power excursions to restart an induction motor than to keep one running. UPS systems manage to keep continuous power. I can understand there might be a phase matching problem when restoring power; I don't know anything about how that is handled.
    • CommentAuthorEd Davies
    • CommentTimeApr 22nd 2021
    Things like these inverter/chargers https://www.batterymegastore.co.uk/product/victron-energy-multiplus-ii-48-3000-35-32-pmp482305010/ can be used like a UPS. They take a mains input (e.g., from the “grid”, a generator or an RV or boat's shore-power connection) and pass it through while at the same time charging a battery and taking power from the battery to boost or, if it disappears, replace the mains input. They'll take over in 20 ms so basically only missing one mains half cycle which won't be noticed by any computer or similar power supply.

    AIUI (from a video about them) they'll automatically resync with the mains when it comes back before using the mains input.
    Posted by me on the previous page:
    "some stuff in G83 about it."

    My bad, G83 is superseded by G98.
    • CommentTimeApr 22nd 2021
    Posted By: Ed DaviesThings like these inverter/chargers

    Yes, thanks. I need an AC-coupled battery because I have a microinverter-based PV system. I believe the Tesla Powerwall can provide backup during grid outages but the economics don't yet make sense for me. But it does seem that such systems are possible and are not prohibited by regulation.

    What I still don't know is whether there are any systems that do have a 30-second downtime, and what revor meant by his 30 second comment?
    • CommentAuthorrevor
    • CommentTimeApr 22nd 2021
    My 30 second comment is when the grid goes down it is detected by the inverter and does certain checks to ensure that it is safe to switch to battery if it switched to battery before doing its disconnect from the grid then it could end up powering your neighbours houses or electrocute a person working on the line. When grid comes back on it is detected by inverter and resumes normal operations. I too am frustrated by having to reset clocks when there is an outage but the only sure way is to be totally off grid. The Ed posting is interesting as I was not aware of the Victron product but bit late in the day for me now. The Tessla system which is expensive also has a delay but a bit less than 30 seconds. if you go here


    Robert Llewellyn has video of a Tessla gateway battery system installed and demonstrated at his house.
    • CommentAuthorrevor
    • CommentTimeApr 23rd 2021
    if you want useful info on cost of batteries you will find it in here.

    • CommentAuthorrevor
    • CommentTimeApr 30th 2021
    Commissioned my system today. Taken me ages to install did it all myself in the end as 4 requests to sparky to connect me all up fell on deaf ears. Was mainly overcast but bright and occasional bit of sunshine. Battery as delivered was 30% full in 4.5 hours was practically 100% . Impressed with the charging rate. Most of the PV produced went into the battery the rest to the grid or boiling the kettle.
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