Peri Hartman via EV wrote:
Thanks for responding.
Yep. about 1 min discharge - load can vary a bit. I can use pretty much
any voltage, but the lower the voltage, the higher the current and I'll
need huge cables and disconnects. The higher the voltage, the more cells
and cell monitors I need, plus need for higher voltage components. Cost
goes up.
I could use an inverter, but I still have the disconnect problem. Let's
say I paralleled groups of cells so that I have about 11V. Then I'd have
about 600A. That's huge. Or 22V, 300A, still huge. Can I get a
disconnect for that ?
Well, an ordinary SLI car battery can deliver 300 amps for a minute.
Cheap and available, and no BMS is needed. That's a negligible depth of
discharge, so they can do it thousands of times if recharged promptly
between uses. You can use two of them; so 24v at 300a. There are
off-the-shelf inverters to boost this to 240vac or 300vdc; whichever you
prefer.
The main drawback is the weight.
Lee Hart
--
Whether we or our politicians know it or not, Nature is party to all
our deals and decisions, and she has more votes, a longer memory,
and a sterner sense of justice than we do. -- Wendell Berry
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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