Recent content by sharpener

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    Steca service in UK?

    Until last year, servicing for Steca inverters in the UK was provided by CTDI, now it appears this has been discontinued. Is anyone offering an alternative for Steca warranty support now? I have a problem with an inverter which will not remember the time and date after a power cut, could this be...
  2. S

    Solar Panel immersion heater automatic switch.

    True. I have often used the principle to power small items from 240V without using a transformer (but only where the circuit does not need to be isolated from the mains!). But your RC circuit will still have a leading power factor, and to be any use Xc needs to be large-ish compared with R, so...
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    Storage - The Way Forward ?

    Interesting, but the same has been said over the years about flow batteries and sodium sulphur amongst a number of other technologies. Aquion's chemistry is innovative but not quite as benign as is claimed. Their website talks a lot about "brine" and "salt water" but the original electrolyte...
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    Storage - The Way Forward ?

    I had an email exchange with Tim Bunhill <Tim Bunhill <[email protected]>> who said the Exeter supplementary paper explaining the cost-benefit analysis is not available for publication but he did send me their spreadsheet and might do so for you. It runs to 14Mb and many, many sheets so is...
  5. S

    Advances in photovoltaic technology

    ...thereby producing water. 2H2 + O2 => 2H2O
  6. S

    16 amp 230v limit

    Thanks for clearing up that point Ted, it covers not only the device then but also the way it is installed.
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    16 amp 230v limit

    I am surprised they are prepared to buy this argument. Someone will turn off the heating "because it is summer". Or there will be a thermostat somewhere (to meet the requirement for energy-efficient controls!). Or the heater will have its own internal high temp cut-out to protect against a...
  8. S

    16 amp 230v limit

    IIRC it is the declared net capacity of the inverter (after internal losses), the logic being that its own control system will limit the output to 16A whereas in the scenario you describe there is typically no way of ensuring the net export does not exceed 16A. So I have 2x2kW Steca inverters...
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    Storage - The Way Forward ?

    I think this is a bit alarmist. I agree there are potential problems with lithium batteries but the industry is eventually getting to grips with them. OTOH lead-acid and nickel-cadmium batteries have been around for decades and the only protection you need against sudden release of all the...
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    Storage - The Way Forward ?

    No, it does not make sense to do that on a regular basis. Assuming you need something like 4 kWh to recharge a nominal 3kWh battery we would achieve that on 271 days/year on average here in S. Devon and 9 days/month even in January (the worst month), so the need to do a maintenance charge from...
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    Storage - The Way Forward ?

    As a prospective purchaser I am struggling with the economics of storage systems, much as I would like to have one for reasons of self-sufficiency. Suppose there are 300 days in the year when there is enough sun to fully charge the battery. At 16p per kWh of grid power my maximum possible...
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    Battery Storage And Uk Regulatory Compliance

    Thanks for that Ted. Am trying to find a good solution to Maximise self consumption Provide backup for power cuts ideally with island operation so that solar power extends operating time when grid is down. No, the proposed arrangement would not be able to put energy from the batteries...
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    Battery Storage And Uk Regulatory Compliance

    Hello all, I am thinking of adding battery storage to my existing setup to increase self-consumption and provide backup for power cuts. Currently I have 16 x 230W panels feeding 2 + 2 kW StecaGrid inverters installed in 2011. If I were to add for example a Victron MultiPlus 48/3000/35-50 in...
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    Help with calculations please

    Try the calculator here PV potential estimation utility. For a very rough estimate, sites in S England with a S facing roof of reasonable pitch will generate in a year total kWh equal to about (1000 x nominal peak power in kW), as per SRE's example.
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    Radial final circuits in garage

    To be exact, the configuration _as inspected_ had only one of the spurs actually installed at the time, even so they wouldn't accept it. IIRC the On-Site Guide says that one spur per socket or item of fixed equipment (i.e. two, which can be from the breaker) is acceptable on a radial cct with...

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