Ok I "may" have been slightly emotive with my last post, however I have now received my Biolite stove, with a COD of £37.40
and I've had a little play with it tonight, here's my initial results, thoughts;
I use an unusual medium to test my wood gas stoves, (home made and bought), cat litter wood pellets, they are consistent so all my results are the same-ish
I filled the stove with pellets to under the higher set of secondary air holes, (thats unusual btw I've never seen a pyro, wood gas stove with two sets of secondary air holes), I used a couple of cotton wool pads laced with denatured alcohol hand cleaner and some small twigs as a starter, let it burn for a minute or so then started it up on the low setting, allowed that to run for a further minute, then set a Primus Eta pot on top with 0.5L of tap water, it just fit, then set the fan to high. Almost to the second, 3 minutes later had a rolling boil.
I switched the fan back to low, cooled the pot down and filled it with 1L of tap water, set it back on, and reset the fan to high, 4 minutes 30 secs later I had a rolling boil, dumped about 10mm, set the fan to low and the boil continued, after a couple of seconds I removed the pot.
Next I wanted to try the recharge facility, btw I hadn't recharged the stove with more fuel as yet. I plugged in my iphone 4s and used an app called battery magic to check charge times. I switched the fan to high, and it averaged about 7 secs per 0.1% of recharge, not brilliant, but in an emergency useful.
However I did find that once the wood had burned down sufficiently, ie a few coals the stove stopped charging, it looks like, from first impressions that the battery by itself cannot sustain a charge, it requires the boost of the seebeck, fan, woodburning effect to do that. I'll need to sort out a Fluke (voltage meter) to check that.
From one load of pellets, (maybe half to 3/4 a cup) the stove run on high for approx 45 mins. Not bad at all.
Quite happy with mine, more testing to do on the charging aspect, but as a wood gas stove, it works well.