BBP,
Good work on the carbon mudguard. Didn't know it was possible to make carbon parts without a big curing oven.
Yes, save that commute money to spend on a more powerful e-bike kit

Here in Brissy, workmates talk of saving about $1000 a year in public transport with trips of 15km.
As the charger creates heat, you will actually use more energy/money to recharge.
I did a rough calc (via the house meter) and comes to around 20c to recharge my 36V 9Ah bottle battery. So cheap. Good, that we are talking cents, and not dollars
Sorry to hear about the PAS issue. You might be able to check the PAS with a multi-meter. See what the resistance is across connecting wires as the magnet pass by. Not whether this is detectable this way, or whether the passing magnets just induce a current change.
Have recently bought a Golden Motor DD 250W 36V 26" front hub kit for less than $200 (lucky bidder). Cheap, but heavy (~7kg for wheel). Installed the PAS system, but didn't like the delay for it to kick in, so purely use the throttle now, like on my Solarbike kit. Hub, broke the lugs off my alloy forks on my second test ride, so have made up some torque arms for it. But breakage could be due to washers being too big for inserts in the forks. Have since grind down washers to fit. Replacement forks have not broken yet. This hub sees about 40kmh unloaded, and feels like getting to about 37-38kmh before it cuts out. Tempted on getting a 500W 36V version, but this will only chew up the battery quicker, and less options for riding it legitmately.
Before buying the GM, I was going to buy a Dillenger 250W kit after reading your review. But then I saw the cheap GM kit, and I didn't need another battery.
Now, I have recently bought a Dual Suspension mtb, and am thinking of buying a MXUS 250W 36V geared front hub to that (light at about 3.5kg). Kit does not come with battery, so suits my purpose.
Pity that Dillenger don't do kits without batteries. Suppose it complicates the warrantee and ordering/handling process.
The two different types of chargers I got from Solarbike do not get hot, from what I have noticed. Can still touch them. One has a fan - 2A, the other not (brick-type) - 1.35A. Both take about 4-5 hours to charge a flat 36V 9Ah battery.