Post-Starfest, I’m charged up!

Starfest is an event hosted by the NYAA early in August of each year around a weekend close to new moon at a site close to Mount Forest, Ontario. Several hundred (at least!) amateur astronomers and their families show up, and some of the kids who attended with their parents in the eighties are now showing up with their own kids. It’s a great event, but for most attendees it involves spending a few nights under canvas, and that’s one of the motivations behind my van conversion – I don’t mind putting up a tent, but I certainly don’t love it, and my wife hates it to the extent that last year she refused to come.

While I’ve been dithering over design details and waiting for engine repairs I’ve also been acquiring things (new mount, new OTA, new astrocamera) which were appropriate to Starfest, as well as appliances (power inverters, a microwave, a drip coffee maker, an induction cooker, a propane stove) which could be tested there. This last Thursday I more or less threw everything into the van and headed off to see how everything worked together (and I consider myself to be one of the components in the mix – things can work perfectly together, and I may still feel uncomfortable with them.

Now, first of all, Starfest as an event was excellent. The skies weren’t cooperative, in the sense that we got only one all-nighter out of it. Thursday night it was cloudy, Friday night it rained before clearing up well after midnight, and Saturday night, the one clear night, was distressingly cold for August. The various daytime talks were good, though I missed a couple which I had wanted to catch because my internal clock was awry after I stayed up talking with friends late into the night. The vendors had lots of interesting stuff, and some of it was quite drool worthy – but I’ve been spending on the van recently, and spare cash is there only if I am delusional (I must be though, since I bought things, and had some difficulty remembering details when the bills came in).

I did run into problems with my electrical setup, though. The microwave is billed as a 700 W device. Which it is. Sort of. It delivers 700 watts to whatever food I am cooking, but it unfortunately draws well over 1000 watts from the wall socket, wasting the rest in heat, a turntable, and internal electronics. In consequence, my 1000W inverter shut down rather than supply the power, and I had no working microwave. On the other hand, I did have a 3000W inverter supplying modified-sine-wave power, so with some trepidation, I tried that. I say trepidation because modified sine wave power contains a lot of transient frequencies which can make electronics unhappy, but in this case the microwave seems to have been able to handle them (though time may reveal that the life of the micro has been reduced).

I had my hot oatmeal, but something was bubbling at the back of the van. It turned out that the micro had pulled the battery voltage low enough to trigger the EFOY fuel cell, which was merrily dumping power into the battery pack. Not a great concern, but something of a surprise, and rather unwelcome because the cooler was pumping along keeping my food and pills cold and drawing about as much power as the fuel cell was putting out. I can’t run the cooler from the battery pack because the EFOY can’t keep up – I need a more efficient fridge. That night I pulled the plug on the cooler, and eventually the EFOY got ahead of the point where the battery had started out. Every time I used the micro the EFOY lost ground, but a couple of hours running brought the battery pack back. Had I started from a truly fully charged point and never used the cooler, I might have survived the first couple of days without triggering the fuel cell at all.

I still needed to cook, but in my hurry to leave I had left the propane fuel behind, and given the power problem (I still needed to cool my food and meds during the heat of the day), I was reluctant to even try the induction cooker (and I still haven’t). I called Daniella at home, and she brought up a small bottle of propane when she came up on Friday afternoon. After that, the propane stove worked just fine for cooking purposes,and I’ll happily use it in future outings.

The only other disappointment was again due to my haste in leaving – I came up with only one of the counterweights for my scope, having fooled myself into believing everything was balanced when in fact I had not released the clutch properly on the RA axis. The scope was therefore unbalanced in operation and I decided to limit the usage as much as possible. I did wind up learning more about my new mount, though, and I count that as a plus – and as an added bonus I got to look through a number of other people’s scopes, including a monster made by Normand Fullum’s company (36″ f/3.5. Wow!)

There are a number of changes to make (real fridge, designed for 12V operations, just as one example) but all in all I happy with the setup and I think I could leave for the Great California Trip anytime (but I’ll see how much more I can fix up before we actually leave).

Testing the fit

The van conversion is moving along. Due to insurance requirements I had to pull seats from the passenger compartment, so this was the starting position:

The intent is to lift the bed high enough to allow for storage underneath, but I’m nervous about stability. Here’s the first attempt:
Unfortunately by the time I got the unit set up a storm was rolling in, so the image is a little dark, but I think the main idea is clear. The base is over 30″ high, with a further 6″ for the foam mattress, so I will need to provide a step or two in order for Daniella to climb aboard (I’ll need a little help myself!).

I will have to raise the mattress another inch or so – it’s a double, and is just slightly longer than the inside of the van is wide, so I can either raise the mattress so that it encroaches on the window “sill” area very slightly or cut the mattress to fit the limited space available. Cutting is irreversible, so that isn’t really an option.

This part of the project allowed me to give my router table a workout, and it worked out quite well, along with the Porter & Cable 1 1/4 HP router. I can’t say the same for the Bosch palm router I used for other parts of the project, as the collet came loose a couple of times, allowing the bit to drop slightly while I was cutting a slot. Perhaps the bit’s shank was a little undersized so that the collet couldn’t tighten properly. In any case, the net result was a ragged cut, and I’ll have to do a little work to smooth it out.

So far I’ve managed to keep everything removable, so in a pinch the van can be restored to its original condition with the exception of one row of passenger seating. That will change once I start adding electrical connections, but I will continue trying to keep changes minimal.

If it matters, construction is in 1×2 maple and 12mm maple plywood, and is currently held together entirely by glue and friction fitting in slots routed into the 1x2s. The mattress base is built from 1×4 maple spanned by a set of slats from IKEA. I’ll peg everything later, and probably reinforce the interior corners with further bracing.

Stay tuned…there will be more!