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re: battery curves
26 apr 2000
m.simon wrote:
>current transformers are only good for ac.
or a load controlled by a microcomputer :-)
this electronics is still evolving.
>>it might be less costly and complicated to monitor the current that
>>flows into and out of each battery using current transformers around
>>their interconnections. seems cheap for these high currents, given
>>a load controlled by a microcomputer and a 16:1 cmos analog mux...
the current transformers might be a few turns of wire on a nail or a tiny
toroid strung over the battery wire, a 4024 inverter already contains a
microcomputer, and digikey sells 8:1 74hc4051 analog multiplexers for
$36.90 per 100 (if it's not built into your $5 pic microcomputer :-)
remember the "gemini synchronous inverter," ca 1970? that was a big
backwards lamp dimmer, in pre-microcomputer days, when lamp dimmers
were more expensive too... it sold for $1500, with less than $100
worth of parts in the 4 kw(?) version. i started building one by
winding a choke on a square 1/2" galvanized iron pipe loop :-)
trace microsine inverters should get cheaper when they have
a little more competition and the regulations become clearer...
nick
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