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AlistairHowie

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About AlistairHowie

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    Proto Star

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    Harpenden
  1. Hello - I hope you don't mind the PM, but I saw your post about lithium polymer batteries.  I've posted a nice, reliable, safe one for sale if you're interested ... You can check the Deben website and you will see that it's not the typical Chinese mass produced lipo that is prone to puncture and explosion.  It comes with various protections built in, and it is built to international standards.  Best of all it's only about 750g, so waaaaaaaaaaay lighter than a sealde lead acid batterery.

    OK ... sales pitch over :-)

    Thanks for looking.

    Alistair

     

  2. Battery details posted above. Slowly working my way through the rest while trying to do my day job!
  3. LAST ITEM ... Selling up to pay for a pedal harp for my daughter ... Gold Focus mask and software. Full details here http://www.goldastro.com/goldfocus/overview.php. Easy way to get critical fOcus if you don't have an electronic focuser. Includes mask and analysis software on CD. Fits OTAs of outside diameter 90-118mm. Pic below. Price £30 including P&P (33% of new). But open to SENSIBLE offers! SOLD The Deep-Sky Imaging Primer book buy Charles Bracken - Mint condition, the next step on from Making Every Photon Count. Well written, well presented and understandable. Full details and review here ... https://www.amazon.co.uk/Deep-sky-Imaging-Primer-Charles-Bracken/dp/148180491X Pics below. £17 including P&P (58% of new) PRICE REDUCTION QSi 690 WSG-8 and peli case - excellent condition as I hope the photos show (because of their large file size, they are pretty unforgiving of dust, etc), and as with all my equipment, rarely used. Comes with orignal carboardbox, Peli case, Allen keys, AC power supply, T-mount to 2" nosepiece. Pics below including 15 minute dark taken at -15 deg C in my 25 deg C kitchen!!!! Price £2,345 including p&p, which is only 60% of new 12V 10Ah Tracer lithium polymer battery. Full details here ... http://www.tracerpower.com/12v-10ah-lithium-polymer-battery-pack.html Ideal, light weight (only 735g and can be popped in you pocket) power source for something like a Celestron CPC scope, where it can be velcro'd to one of the form arms or happily sit on the top "plate" of the mount. I've also used it as a supplementary power supply for the likes of dew bands, focuser, etc. Comes with integrated "fuel guage" and Battery Management System to provide overcharge and over-discharge protection, thermal protection, over current and short circuit protection. Unlike a SLA, it's well near impossible to ruin. Comes with a mains charger and nylon case, but I don't have the DC vehicle charger (although you could easily buy that here http://www.tracerpower.com/12v-dc-vehicle-charger.html if it that's important to you). As usual, it's in mint condition. It has been cycled no more than 20-30 times. Because it's a LiPo, it would have to be collection only from AL5 or London Price £75 (45% of new) Canary yellow (so you don't trip over it in the dark!) Peli Storm IM 2700 waterproof case with 2x rechargeable Peli dessicant. No foam insert (except in the lid) but that is easily ordered from any online Peli dealer, ebay or the likes of eFoam.co.uk so you can pluck/cut to your own storage requirements. Excellent condition. Pics below (looking wet because I'd just hosed it down to get the dust off!). Price £80 (45% of new). CAN POST FOR AN EXTRA TENNER, WRAPPED IN BIN BAGS OR SIMILAR Binocular Astronomy book by Stephen Tonkin - Mint condition, £14 including P&P (57% of new) Turn Left at Orion book, edition 4, spiral bound - Mint condition, £12 including P&P (56% of new) Gerd Neumann Aurora flatfield panel and inverter - powered by 2xAA battery, 100x100mm square illuminated area, so perfect for the Baby Q. Includes removable grey filter which can be mounted in the panel to dim things down if your CCD is a little too sensitive - Pic below - Price £45 including p&p, which is 66% of new. EQ6 EQDIR USB cable. Pic below. Price £20 including p&p Fused, waterproof, 6 port 3-pin XLR connector power box - 5x 12V output, 1x5v output for a USB hub. Power lead has a blade fuse, and terminates in a t-bar connection for a Deben Tracer battery. That is easily cut off so you can terminate it with whatever connection your battery/power source requires e.g. bare wires, cigarette connector, etc. Pic below. Price £40 including P&P Icron USB ranger 2104 powered hub with an operating distance of 100m over Cat5e cable. Full details heree ... http://www.icron.com/products/icron-brand/legacy/legacy-2101-2104/ The USB Ranger 2104 supports USB 2.0 peripheral devices at speeds up to 480 Mb/s over a distance of 100m/330ft. It supports four device ports via an integrated hub, enabling host computer and peripheral extension over standard Cat 5e UTP cable. Suffer no more from USB hub drop-outs. Run up to 100m of Cat5e cable to your mount outside and relax in the warmth inside as you capture your subs!! Excellent condition. Comes in original packaging/box. Pic to follow. Price £75 including P&P FSQ85 ED OTA, SoCal Astro rings (no longer manufactured), Losmandy plate - excellent condition per the pics below, comes with all the adaptors, camera rotator, etc that you get when you buy new. I even have the original Tak double carboard box!. I'll throw in the SoCal Astro rings and Altair Astro 10" plate for free. Pics below. Price £1,630 including p&p which is 66% of new Adaptors to plumb it all together – M54 – T2, CA35 to TSA 102, etc. Avalon Linear with Skywatcher handset, T130 tripod, counterweights and Avalon softcases x2 - Purchased from IKI October 2014, mint condition. Price £2,520 which is 66% of new. Pics to follow 24mAh Deben Tracer LiFePo4 battery - more details here http://www.tracerpower.com/lifepo4-12v-24ah-battery-pack.html Good for 1,400+ charges, it's had no more than 30. On further investigation, this can't be shipped by Royal Mail (which is a shame since it is completely inert and not at all like the explosive lithium polymer lipos), so collection from AL5 (or City of London) probably necessary ... unless I can find a competitive courier company. I will try and add photos later today, but it is in perfect condition and looks exactly like the one in the link I have posted. Comes in a nylon case with mains charger. Includes T-bar connector with twin cigarette sockets. Pics below. Price £180, which is 60% of new. Astrodon 1.25" E Series Trubalance L, R, G, B and 5mm Ha filters – LRGB £300, Ha £215 or £500 for them all. 100 Best Astrophotography Targets book by Ruben Kier - £10 including postage. Lakeside motorised focuser - includes bracket to fit the Baby Q, handset, 3x cables, instruction sheet, CD, original box. As new. Pic below. Price £200 including p&p, which is 66% of new Thanks for looking. Shout if you have any questions.
  4. Unfortunately, the price is right. £659 EX VAT, but £790 INC VAT. Either you are VAT registered, they made a mistake or they've just increased their prices by 20%! EDIT: Actually it's available here http://www.sure24.co.uk/tracer-rdcbat-lp40-tracer-12v-40ah-lifepo4-battery-pack-in-peli for £654 inc. VAT, although the case dimensions look a little different from the Deben site. Either way, if anybody wants one, you probably have a small window to buy at this (potentially old) price.
  5. £650 isn't cheap, but it's a better price than I thought you'd get! Deben offer a 40Ah 12V LiFePO4 in a peli case for £790, but I see you can get the battery alone from them for £454 and then add in a charger and peli case separately. I take it you went for the latter option? Do you know what the difference is between what you ordered and their stock, £790 option? Just wondering ...
  6. Re how to hook the batteries up, they come with proprietary connectors on the battery side ... t-bar with the LiFePO4 and a little used automotive connector on the LiPOs. You can see pics on the Deben website. The other end of these cables terminate in various plus including cigar socket, Anderson Powepoles, etc. In the past, Deben have made up 2 cigar sockets to one t-bar cable for me. If you need more than that, rather than daisy chaining y-connectors you probably need to build a distribution box. And if doing that, change everything to XLR plugs!
  7. That links to Tracer LiPos not LiFePO4 batteries. The lipos have a declining voltage over their discharge cycle (curves on the FLO site from memory) whereas the LiFePO4s hold their voltage much better at around 12.5v. I have a 24Ah LiFePO4 and their capacities go north of 40Ah, but boy are you going to have to pay for the likes of them. Grab a 24Ah cell for circa £250 ( extortionate, I know) but use 90% of its capacity for years and years to come without worry). Possibly cheaper in the long run ....
  8. How heavy is it?? Possibly important for a mobile imager going to a dark site. Have a look at Deben Tracer LiFePO4 batteries - expensive, but MUCH lighter, smaller, able to be discharged MUCH further than SLAs without any problem, nice constant voltage over 90% of their discharge curve, only lose 0.5% capacity per day, 1000+ charge/discharge cycles, inbuilt over charge/discharge/etc protection and very very safe (unlike LiPos). Just a shame they're so expensive ...
  9. In fairness, I find that the vast majority of online retailers fail to comply with the DIstance Selling regulations by e.g. regularly refusing to refund outbound postage costs, failing miserably to provide required information at the point of ordering, requiring the goods to be returned in their original packaging, etc. Just for the record, attached is a nice, concise summary of the regulations for both retailers and consumers alike. DSR.pdf
  10. Callum, you can get a dec axis extender to lift the scope out of the way of the polar scope.
  11. Billy That's really helpful, thanks for the reply. i already have my Tracer Lipo http://www.deben.com/tracer-battery-packs/12v-10ah-lithium-polymer-battery-pack.html which is all nicely packaged, protected from over charge, discharge, shorts, etc and has it's own power guage. So I feel safter using it rather than a Turnigy lipo. I used to have Turnigy lipos when I was into RC helicopters but they were kept in a lipo bag when not in use and sometimes in an ammo box as well! I don't take such precautions with my Deben battery (maybe I should!) so I'll stick with that one. And as you point out, the slightly lower voltage isn't an issue when outputting 5V. Thanks so much for the offer to do the DIY for me, that's very kind. I wouldn't know where to start with a soldering iron, even if I had one. I got away with crimped Anderson Powerpoles in the RC world! I'll source all lthe parts and take you up on your offer. I'll be in touch, Thanks again. Man .... I LOVE this forum!!
  12. Thanks for the suggestion, Mick. I already have the 12V Universal DC supply and have been using it fine with my LiFePO4 battery, but that outputs about 12.5V across almost all of it's discharge curve. I'm reconfiguring things now and seeing if I can run my hub using a my lipo battery at 11.5V. I suspect it'll all be fine, but just looking for input from someone in the know. Those BECs are interesting, though. Far less bulky than my clunking great universal power supply so now you've got me thinking and a quick Google search returned this ... http://www.ebay.co.uk/itm/New-Waterproof-DC-Converter-12V-Step-Down-to-5V-3A-15W-Power-Supply-Module-/301379142651?_trksid=p2054897.l4275 Looks like all I would need to do would be to put a cigarette lighter plug on one end, and a 1.7mm power tip on the other (actually, I have no tools or ability to do that, but I'll worry about that later!!). Input voltage is 8-23V, so that would work just fine with my lipo. So I have three questions then ... 1. What is the functional difference between this small converter, and my larger converter? Why the great size difference, do they operate in different ways? I know my converter offers switchable output, but that can't be the sole reason for teh size difference ... or is it? 2. My existing DC DC converter is fused, and I guess this little box is not. Is that an issue, or do I just put on a fused cigar plug? 3. The description on the above item says it is non isolated. What does that mean, is it an issue? All advice gratefully appreciated. Many thanks.
  13. But your 12V gel cell will be outputing more than my lipos 11.5V, won't it?
  14. Love your first light pic! Can I presume these settings worked ok or did you modify them?
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