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Good morning.... let me work through your questions.... "I think you're saying that the modem on the modem side of the adapter uses a fairly steady 46 watts no matter what." Not quite..... It is "rated" at 46 watts consumption of AC power.  That is the AC line side of the adapter.  As foxbrook pointed out (and I spaced out), the discrepancy between the numbers listed on the brick are what the brick is expected to produce to supply the modem and radio, and what it actually produces, and what its UL limits are. Depending on the condition of the modem and radio components, the "brick" will produce the appropriate DC voltages on the modem side of the brick up to that 46 watt of AC consumption. As curtis-m said, it appears that his is using somewhere around 9 watts of power.  And my caution with that is, as I said, there are different types of inverters (three to be exact), their quality, stability, etc. will vary, and so on. That is why I said your decision is a personal choice.  For planning purposes, do you plan for "max" (46 watts), do you plan for "probable" (10 watts or so), or do you take a stand somewhere in the middle. (20-25 watts?)  That is just a "comfort" decision. "Is it possible that the modem uses much more power to compute and determine and straighten out the data contained in an incoming signal that's been seriously degraded by weather conditions, solar conditions, whatever?" In a word, no. It does use more computing power in the processor when it is dealing with exterior conditions (good or bad), but that does not translate to any significant difference in AC power usage.  Some minuscule changes?  Most likely.  But nothing in the grand scheme of things. "In between transmitting and receiving times is the modem idle, using only a few watts at most? " Again, no.  When the modem is powered on, the radio is powered on.  And the two devices are the sum total of AC power consumption, regardless of any user activity.  Other than the minuscule changes I mentioned above based on how hard the CPU may be working at any given point in time. "such could more or less provide a reconciliation between what you've said and what Curtis-m said." Think I answered that.  A simple analogy.  A car tire may be built to run 120mph (the UL rating), but will it ever?  Possibly, but not likely. "Does HughesNet use the world's most inefficient power adapter, converting about 150 watts ac to 46 watts dc. A couple of parts to that. First, again, as foxbrook said, the 150 watt number is the UL maximum current draw that can be expected under the most extreme component failure.  As with most UL things, they have little relation to reality. Second, the 46 watts is not DC, that is still on the AC side of the brick. "I use only dc. Is there a way to connect the modem directly to a dc source of power?" No.  the power brick produces several DC voltages from the AC source.  I have not taken a volt meter to determine what they are in this particular instance, but the common power brick usually produces anywhere from 3 to 6 various DC voltages that range from -/+5vdc to -/+48vdc. and are used for isolated purposes within the equipment.  It might even pass 120VAC through to the modem in addition to the DC.  As I said, I just haven't checked to see what it is providing. Hope that helps.  If I missed something, or you have more questions, fire away...... ... View more

Excellent point foxbrook.... totally spaced UL involvement in this whole picture... ... View more

Catching up..... Information source..... from the written spec.... as I said.... for planning purposes... the only number I believe you can use is Hughes.  I didn't look at my brick, but, obviously Corrosives is newer (or older) than this spec sheet since his states a different input current rating. The difference between the input calculated wattage and rated power consumption is a function of voltage at the input vs the various voltages supplied on the output of the brick.  Thus the lower power consumption rating.  Since we are not given the output voltages or currents drawn by each of them, we can not calculate backwards into that 46 watt number. I, obviously can't disagree with what curtis-m says his is drawing.  To use a simple analogy, the only precaution I would offer is that inverters, like cars, come in many sizes, shapes, and colors.  And as car advertisements all say "your mileage may vary". Where I will respectfully disagree is that the power usage changes based on external influences such as weather, dish pointing, etc. A one-watt radio is a one watt radio.  When the modem is powered up, the RF carrier (radio) powers up, and uses what it uses and doesn't change. What does vary, depending on those external influences, is what modulation technique is used to modulate that RF carrier (send and receive data).  That is solely a function of the firmware in the modem talking to the NOC to optimize the transmission path.  And changing modulation technique, does not have any significant impact on power consumption. Caveat: There may be some small power consumption change depending on how the firmware uses the chips in the modem for various modulation techniques, but I would expect that to be a very small number in the overall power usage. It is only a question of how much data can be transported over the link under the current conditions using that one watt radio.  When the modem reads the incoming signal, if it is degrading or improving, it will tell the NOC, we need to change the modulation to slow things down or speed things up to optimize usage of the link. So, Timothy, at the end of the day, it all depends on what approach you want to take to calculate your power needs. ... View more

Timothy, Power consumption is not relative to what you are doing from a usage standpoint.  It only relates to providing the necessary power to run the components of the modem. It is stated in the specs for your modem.  (e.g. - the HN9000 power supply is rated at 46 watts.)  So I would suggest using that number (depending on your modem) for your calculations. ... View more