richi

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richi last won the day on August 7 2017

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About richi

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    Sherfield-on-Loddon

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  1. As requested in a thread about battery storage of renewable generation: DoD -- depth of discharge (essentially the opposite of state of charge) SoH -- state of health (a percentage of how much charge it can hold, compared with the as-new spec) Wh -- Watt-hour (a measure of energy) BMS -- battery management system LiFePO4 -- lithium iron phosphate (a rechargeable battery chemistry)
  2. richi

    type of pv

    Soz. DoD -- depth of discharge (essentially the opposite of state of charge) SoH -- state of health (a percentage of how much charge it can hold, compared with the as-new spec) Wh -- Watt-hour (a measure of energy; a thousand Wh is a kWh) BMS -- battery management system LiFePO4 -- lithium iron phosphate (a rechargeable battery chemistry)
  3. richi

    type of pv

    This pleasantly kooky lady claims 8,000 cycles at 80% DoD gets you to 80% SoH. Price seems to be about US$1 per usable Wh. BMS included in each 12V pack. LiFePO4. So, including tax and shipping, say about £1.50/day for 10 kWh over 20+ years (neglecting time value of money).
  4. Looks like Iresa aren't taking on new customers because the regulator told them to fix the customer-service issues first
  5. I wonder if there's also an effect where those selling futures are trying to recoup unexpected losses from the long, cold winter? Most of the UK buys electricity on fixed-rate contracts, so I suppose these will be backed by the purchase of futures. I guess someone will have lost money on the bet this winter!
  6. FWIW, the official line from EDF seems to be: "Cold weather earlier in the year" (but that surely has nothing to do with forward wholesale electricity prices?) "Gas stocks reducing over the winter" (that makes more sense, because of #1) "Global oil markets" (USD crude prices are high, plus GBP is weaker, and gas price pegged to oil)
  7. I keep hearing about providers raising prices unexpectedly. As discussed previously, I'm on a monthly tracker tariff and I'm not seeing the expected summer dip in prices. In fact, the most recent monthly rate has increased. The wholesale prices tell a sorry story. Anyone got an insight into why prices are higher this year? This is the monthly N2EX rate with each year in a different colour for comparison (looks worse than it is, because the Y origin isn't zero). Sure enough, no summer dip:
  8. richi

    Burnt Out Megaman LED GU10

    While we're recommending LED downlights, we used Collingwood H2 Pro 700 in the garage conversion/extension. It's a single-point LED, which dims down to a star-like speck on a good dimmer (we use Zano remote dimmers).
  9. richi

    type of pv

    I figured I'd missed something obvious. Thanks, Jeremy!
  10. richi

    type of pv

    Wow, that's still a lot of cash, unless I'm missing something. A "leisure" 12V lead-acid specced at 110 Ah is £85 from the local leisure shed. So be generous and call it £100 per kWh. No idea how much the inverter and BMS would be, but surely not thousands? Even if the L-A batteries have half the useful life of the Li-ion cells, the Sofar and Tesla systems seem pricey. I bet I'm missing something important.
  11. richi

    BT duct supply

    If you're in a low speed area, getting four Openreach pairs is a great idea. You can spin up ADSL2+ on more than one pair and load-share your internet usage across them. It just requires a home router that supports round-robin routing (there are a few). Or you can do "true" bonding, but that's requires an expensive service, similar to a VPN. Or you can go full-on Ethernet over multiple pairs, which is a business-grade symmetric service (and even more expensive). In the near future, one way BT Wholesale and TalkTalk might address the upcoming 10 Mb/s minimum speed USO is by using native ADSL2+ bonding -- it's a feature that's already in their MSAN kit in the exchanges, but hasn't ever been offered to consumer users. So, for example, a property that only gets 7 Mb/s can bond two lines to get 14 (well, probably a little less).
  12. The "area" Vent-Axia I used in the garage reno uses what looks like a load of plastic straws bundled together (and, no, I didn't pay anything like £720 for it!)
  13. richi

    early mounting solar PV

    ...assuming your meter doesn't have a fraud flag that trips when it runs backwards
  14. richi

    Gas boiler servicing cost?

    @Coopers and I pay ~£70 for a safety cert at our rental properties.
  15. richi

    My kitchen - pricing

    Hard to say. Here's part of my quote from a year ago. We negotiated it down from this by £200 plus some rather nice oak cutlery trays to replace the "silver" plastic ones.