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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: How will efficient speakers/amp on batteries compare? posted by Saturntube on March 21, 2012 at 14:21:17:
I buy surplus batteries cheaply, and they tend to last about 3-5 years. The 50V stacks are charged in parallel on a single 55.2V fixed supply (a Mastech adjustable powersupply from eBay, set at 55.2V).The general rule for trickle charging is a charger with current delivery of 0.2x the capacity of the battery you are charging, thus a 1.2Ah stack would draw about 1.2A*0.2 or 240mA in charging current. I have eight stacks in parallel so that is 240mA*8 or 1.92A. The charger is a 3A charger so it works fine here, with a little headroom.
My present batteries are 1.2Ah I believe, which is rather small. In general, you should aim to discharge a battery by no more than 50% on a regular basis, so the effective Ah is 0.6Ah. My amps run about 100mA for both channels, plus another 50mA or so for the preamp, for a total of 150mA or so. Thus, you can expect about 4 hours of use from it to a 50% discharge. If you use something like a 300B at 80mA per channel, then of course you would discharge them faster.
If you can live with the large size, the 7Ah batteries seem to be a very good value. You can sometimes find them as cheap at $5 or so each. I would make boxes of 100V (two stacks) each and wire them in series. This would give you a lot more capacity, at the cost of larger size and weight of course.
I would again recommend using a bypass capacitor of at least 10uF, in the amplifier. You could even have a choke-capacitor combo. Batteries are not designed to pass AC.
I wouldn't necessarily say that you can't achieve similar effects with a standard wall power supply. However, to make a comparable wall-power supply would also take a lot of gear and money, and you would end up with something nearly as large and heavy IMO, and probably more expensive.
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Follow Ups
- RE: How will efficient speakers/amp on batteries compare? - nl 07:55:42 03/22/12 (1)
- RE: How will efficient speakers/amp on batteries compare? - Saturntube 11:25:00 03/25/12 (0)
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