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RE: Which capacity batterie for cMP HTPC

Hans,

looks interesting! Although I would not want to go for the picoPSU since it is just another switching PSU (although a good one) for 3.3V and the main workhorse 5V, so nothing much gained, this certainly is a good solution. But please take care: From the MIC29502BT's datasheet I see that it needs a "voltage difference" of 350-370mV, so when you want to output 11.93V as has been recommended for optimal SQ, the batteries' terminal voltage needs to stay over 11.93V + .37V = 12.3V. Unfortunately that's a figure the datasheets for the batteries' discharge rates usully don't give you clearly. So with the above mentioned 2 x 28Ah or your suggested 50Ah battery, when using them fully charged you surely get decent playtime until they hit the 12.3V limit, but I doubt that this will be 4-5hrs. Unfortunately datesheets don't really help, I'm afraid you've got to try out. For this reason I use batteries with a total of 18V and a THEL regulator that needs a (quite high) minimal voltage difference of 2.5V which I have plenty, so I'm safe for a long time.

As Theo has explained, with "dirty supplies" I meant supplies like the Granites for HDDs, USB, LCD etc., so everything else than P4 and P24. Since you say that HDDs are external, I have understood that you do not want to power them with the same 12V battery source.

And yes, all the separate wires for the respective voltages (12V, 5V and 3.3V) are connected internally on the MoBo, multiple wires are just used to reduce cabling issues like internal resistance and heat and such.

Regards,
Robert


Edits: 06/21/09 06/21/09
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  • RE: Which capacity batterie for cMP HTPC - Bertel 12:58:11 06/21/09 (0)
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