Quote:
Originally Posted by ReidG
One of the major causes of problems in any computing equipment is inadequate power supply capability.
In this case not all USB sockets can be counted on to supply adequate current at all times.
The same apples to many 12V supplies, they need to be properly sized to work with the load.
Manufacturers often tend to be a bit optimistic about the ratings of their products.
I have three ZWO cameras and have had no problems with them.
Having designed some power supplies for large scale production in the past and been aware of the performance problem I recommend being safe and use supplies rated for greater power output than you need.
The transient load (a short peak at start up say) can cause say a perfectly good camera to appear to fail.
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I’d support the possibility of power supply but would add some comments:
Looking at the voltage specifications for astro systems, they are designed for 12v battery systems (usually about 11.5/12 to 15 or so volts)
I note that many think exactly 12v regulated is necessary and I think you are setting yourself up for issues.
Many people use cables that are too thin and/or too long as well as use inadequate connectors. Voltage drop on cabling/connections (under load) can be the cause of issues. If in doubt, measure your voltage at the device (make yourself a short test cable to put in series with your power cable and measure the voltage). Same goes for USB. Use a USB device to measure the voltage at your device. Some USB cables use wire that is too thin. Some computer ports or hubs (particularly unpowered hubs) just don’t have the correct voltage or can deliver enough current.
Re 12v, if selecting a MAINS powered brick that puts out at least 12.8v and possibly better, 13.5v will help with any voltage drop.
Re MAINS bricks, I suspect that a max current spec is more for marketing and not the advisable normal running current. Ripple on the power is more likely to increase at the supplies limits as well as the voltage drop. If in doubt, measure it at load.