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Decided to put cooling fans on my newtonians a 200pds and a 130pds ,used a 120mm on the 200 and a 80mm on the 130pds ,i used, Be Quite silent Wings2 fans they use rifle bearings and are so quite German made, i did the 200 first and was impressed with this make so ordered the same make for the 130 pds it comes with a lead with four wires but only needed neg ang pos so snipped other two out , made a disc from plastic and cut out around collimation screws on primary then used velcro to attach to OTA fitted a 2.1mm dc socket on to the disc then bought a usb lead to 2.1mm barrel though i may fit another 2.1mm socket on my power box and use 12v either way it works ,i used a dimmer on the 200pds but it doesnt need it and wouldn't use it again but its fitted now so will leave in place.
Over the past couple of months have been putting together the components to build my own 12v Power Tank. Finally got around to putting it all together. Not really being a DIY person, this was a bit of a leap into the unknown for me, anyway it’s all put together now and works a treat. Thought I’d share my experience just in case there is someone out there thinking about a similar exercise, but a bit concerned about proceeding. Here’s the list of components:
Maplin heavy duty flight case - https://www.maplin.co.uk/p/large-high-impact-case-with-pre-cut-foam-interior-n14gr - £49.99
Bluesea Fusebox . https://seamarknunn.com/acatalog/fuse-block-screw-terminal-blade-6-way-4695.html - £46.35
Dual 12v Power Interface Panels with USB and voltmeter x2. https://www.ebay.co.uk/itm/253302906460 - £30.36
LED Blade fuses -
3A x 4 £3.96
7.5A x 4 £ 6.78
In-line LED fuse holders x 2 - £11.38
10A Twin core power cable (3 metres) £7.47
8A Rated crimp connectors (male and female) - £5.00
Total Cost - £ 161.29
Connecting everything together was actually quite simple in the end, all that was required was to crimp the wiring together and connect the leads to the fuse box and the various device interfaces, ensuring of course that the live and earth wiring is correctly connected.
To add to the build I already had 2 10ah Deben Tracer LiPo batteries with power leads which have supplied my field power for the past 4 years these retail at £149.99 bringing the total cost of the power tank to £311.28. This might be viewed as a considerable outlay for power, however my view is that it’s money well spent. My power is now contained in a waterproof, easily transportable container and greatly simplifies my setup and tear down procedure when in the field. The proof of course as they say is ‘in the pudding’. I used the unit for the first time last weekend and it delivered just as expected. I’ve attached a couple of pics one showing the internal layout and another showing the unit connected up, supplying power to my dew controller, WiFi and Sphinx SXW Mount/Starbook.
Got tired of the mess of cables and loose devices I had to always put together and dismantle after each astrophotography session so I figured I'd do something about it. This tray will sit nicely under the tripod and provide a hub for everything including Fused Power, Raspberry Pi, USB Hub, GPS, Dew Heaters, Long Range WiFi etc...
First version will be really crude as I need to have this working in less than a week as I'm going on a holiday taking my astro gear with me.
Someone a while back, most likely on a different site, was asking about the current draw of their mount so that they could factor it in.
Anyway, I decided to measure mine out of pure curiosity so here's my readings in case they are of any use whatsoever to anyone else...
CGEM DX + StarSense HC + StarSense Camera + Celestron GPS
(Measured using a regulated 12v supply and multi-meter)
Normal RA tracking: 470ma max (5.56W)
Full speed RA+DEC slew: 1550ma max (18.6W)
I suspect there is also a momentary surge as the motors start as the power supply needed to be set to give up to 3A otherwise it cut the voltage on a full speed slew and the motor controller objected (although the hand controller was fine as it regulates down to 5v or so anyway I suspect). This wasn't picked up by the meter so it wasn't sustained.
Hi, although I do not have an ASA mount (actually the 10Micron), my question is based if I can use for example a ASA Power Supply Unit 12V - 21A throughout to power cameras, fw, dewheaters etc, separate to the mount. And if so, do I need to split the main output cable to connect to each unit.
Normally , and in a generals context, a CCD works up to 1.5-2A, Filterwheel around that level of amps like the focuser and guide camera, its correct to say that we need to add all these amps of all the units I am using, and take into consideration that the total amp-age does not surpass the power supply amps.