RE: GM voting12 Nov 2020 15:27
Thanks oldblue1973 but here's a long reply. As to the Charger's performance, the point is that we could throw guesses around until we are blue in the face but they'd only be guesses. A real company would put some real data out. What they do say is, as I've said before, "incomprehensible". My guess (no more than a guess) is that the Charger modulates ie. you could have 100% electrical output at 6.4kW and no heat which, with 20kW of gas in, is 32% efficiency and, gas at 3p per kWh, gives you electricity at 9.5p per kWh vs grid at 15p per kWh. Good but not mind blowing and a long payback period depending on capital cost. This also tells you what you do in the summer when you don't need the heat. And when you don't need 6.4kW, you turn it off (like a boiler). Doesn't explain how you'd get 15kW of heat and 3.2kW of electricity from 20kW of gas going in, which is 64% thermal efficiency hence the (ironic) mention of Carnot and the word "incomprehensible". Or "impossible". However, I stick to the view that the Charger is a sideshow. The Charger is just a name for a box of tricks that includes a gas burner (a "boiler"), some pipes, some heat exchanger technology to capture the heat and the tech to feed the heat into a Stirling engine. Take the burner out and you have the tech to recover waste heat from any source and turn it to electricity. That's the interesting bit, the holy grail of the cleantech industry. No-one can do it very well and if you can do it at all well then it's very valuable. We have looked at it for our furnaces and it pays back with 20% thermal efficiency. The problem at Inspirit is that the Board can't spell Sterling [sic.] engine correctly let alone explain any of that. But any company that has spent the last 7 years tinkering around with the technology must have learned something. At least I hope so. So what would I do on the Board? Have a good look, and give them a good hard commercial kick as well as seeing if the know how can be applied to wind turbines and furnaces as a starter for 10. Then improve their communication and tell the story properly.