Hi Lee, I don't think that is how in rush current limiters work. I use them to protect my DC-DC converter caps so they don't get whacked with a high in rush current when the connection is first made.
https://en.m.wikipedia.org/wiki/Inrush_current_limiter Mike On June 5, 2016 10:19:55 PM MDT, Lee Hart via EV <[email protected]> wrote: >Mike Nickerson via EV wrote: >> If the long term current draw will be less than 10A or so, you could >use an in rush limiting resistor. That is a resistor with a negative >temperature coefficient. When cool, they have a very high resistance. >As they heat up, their resistance drops. > >This is probably the opposite of the function Gary wants. Inrush >limiters have a very LOW resistance initially, so the peak current when > >you first connect the batteries is very high. As the inrush limiter >heats up, its resistance rises -- so you wind up with quite a limited >amount of current between them. > >Gary Krysztopik wrote: >>> Does anyone have any cheap tricks for regularly connecting two large >12 >>> vdc packs together (one stationary and one mobile) and limiting >inrush >>> current when they are at different SOC? They both have huge current >>> capability but I need it for energy vs power so one has small wires >and >>> fuses. > >The "cheap trick" is to connect a light bulb between them. Pick the >bulb >so your normal current is well below what the bulb normally draws on >12v. For example, a #57 brake light draws about an amp, and a headlight > >about 4 amps, and a halogen spotlight around 10 amps. > >The bulb won't allow more than its normal rated current to flow between > >the batteries. If you try, it just lights up. But when the current is >less than this (such as while on standby), the bulb's resistance is >LOW. >The bulb is out, and the two batteries are essentially connected in >parallel for float charging, etc. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
