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Mrs RobL is getting a garden office - I consider this to be a large support structure for 6kWp of extra solar. The panels themselves will form the water barrier - underneath it will be water resistant(MgO board, recycled plastic lumber etc) but there won't be a conventional epdm/whatever. That will ...

A voltage stabiliser (optimiser) could drop your home voltage a bit, though the actual grid voltage at your mains fuse would still be just as high (or higher). Can you tweek the hoymiles, up the trip level a bit - it would have pretty much the same effect. Our sunsynk regularly reports over 253V, it...

Took me ages to get our sunsynk soc to mean anything about right. We’ve a fogstar batt, with 305Ah eve cells, and the sunsynk talks ok to the fogstar battery bms, and is on the Libms battery setting. I’m pretty confident even though the fogstar calculates soc itself and the sunsynk is connected to i...

There’s no point fusing the cable at the panel end - the mppt will run them at 90% or so of their short circuit current. You’ll not find a fuse that will work normally, then blow when you want.

In a Split system, the hot heat exchanger is inside the house so no losses. I think in a typical split system, in the outside unit there is an air-refrigerant heat exchanger, a compressor, and a reversing valve. So in heating mode the refrigerant pipe carries hot gas to the indoor heat exchanger wh...

The sun is providing maybe 100W to that panel, of which 20W could be turned into electricity if it’s usefully connected to an mppt inverter, the other 80W turning to heat. If the inverter doesn’t use it for some reason - eg. it’s not actually wired up or it’s shorted out or the current is too high f...

Paying turbines to stop generating is actually not all that hare-brained. It's a lot quicker and easier to balance local network capacity issues by turning off some turbines than it is to completely switch off an entire gas plant. It actually provides additional flexibility. Which will become incre...

Why did Ed Milliband agree to CCS and also to subsidise Drax? I think it pained him to do so, must’ve been some serious lobbying going on.

I’ve heard the 3.5kW Vaillant arotherm plus is a software limited version of the 5kW. If so, you’d have the same low power level, just a limited maximum compressor speed ie power, so lower modulation effectively. I’m not sure of an engineering reason to make two models out of one piece of hardware, ...

IMG_2989.png Well the facts are true; the horrifically high ‘spark gap’ in the UK is why we aren’t all embracing heatpumps. In a perfect world everybody would want to ‘do the right thing’, but financially nudging people to do what you want is a standard government technique - what is Ed Milliband w...