We're using modified sine here. Granted I personally power my bbb via USB 3.0 from a laptop. So perhaps some extra filtering on the input cable into the laptop. However this modified sine system is the same system evilwulfie is on as well. I only power via USB as an easy means to avoid the short brown outs evilwulfie mentioned above( as I require long uptimes to test software that I am writing ).
Adding filtering kind of makes sense to me, as i do know that that we do have excessive line noise on our system. But perhaps if you measured the actual AC output from the wall, and check the specs on the "wal-wart" you're using, perhaps you'll find that it may not be enough. But this is just a guess. On Mon, Sep 23, 2013 at 10:38 AM, Eric Williams <[email protected]> wrote: > Solar inverters are generally "modified sine wave" which is only slightly > better than a square wave. The RMS voltage will be 120, but the peak > voltage will be lower, and lower-cost switching supplies that depend on > peak voltage may have a problem. > > If the solar power charges a battery, you should be able to get a > switching "buck" converter that will drop the DC down to 5v fairly > efficiently (as Gerald mentioned). > > > On Mon, Sep 23, 2013 at 10:12 AM, evilwulfie <[email protected]> wrote: > >> I run my BBB using a 4 dollar chinese power supply 5v 1amp and works >> like a charm >> i also run my design lab and whole house from solar power and only ever >> have issues >> when the transfer switch gets switched slowly and the power does a mild >> brownout >> then the power supply/BBB needs a quick plug/unplug and all is well >> >> i would suspect you are having some grounding issues >> >> just a guess >> >> >> On 9/20/2013 2:49 PM, [email protected] wrote: >> > The Beagle Bone doesn't work with some power supplies. It appears that >> > it is not tolerant of inexpensive power supplies (such as the DLInk). >> > We are sure this is not due to lack of amperage as the Beagle Bone >> > draws about 350 mA from our lab supply and the power supplies that >> > fail are each rated at 1A and 2A. I think it has to do with >> > inexpensive switching supplies which are inherently noisy. >> > >> > Here's where it get's interesting... We found a supply that works in >> > the lab, but when installed in the field it the Beagle Bone's power >> > light was on, but the heartbeat lights didn't blink and the unit would >> > not operate. We thought the supply went bad in the field, so we took >> > the Beagle Bone to our local Radio Shack, tried a supply that worked >> > in the store and then installed them both back in the field. The new >> > supply did not work in the field. >> > >> > The AC power in the field is supplied by Solar Power and I figured >> > this might be the issue. We plugged the new supply and Beagle Bone >> > into a commercial (non solar) outlet and it worked fine. >> > >> > I have to think that the inverter on the Solar Power is injecting >> > similar noise as the cheap switching supplies. >> > >> > Two questions... >> > >> > 1) Has anyone had issues with the Beagle Bone operating with cheap >> > switching supplies or from Solar Power? >> > >> > 2) If so, any ideas on solutions to clean up the Solar Power source? >> > >> > >> > Thanks in advance, >> > >> > Jeremy >> > >> > >> > -- >> > For more options, visit http://beagleboard.org/discuss >> > --- >> > You received this message because you are subscribed to the Google >> > Groups "BeagleBoard" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> > an email to [email protected]. >> > For more options, visit https://groups.google.com/groups/opt_out. >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
