A tank circuit qn + Relay qn.

**nzKAOSnz** · 10-06-2004, 04:05 PM

For a battery based tank circuit, if you use an SLA battery, what size are people using (how many Amp/hr?)

Also, while

ing for this, someone said "relays are bad" or something along those lines. (for use in isolating the tank battery). Anyone care to elaborate?

**auto_robotics** · 10-07-2004, 12:29 AM

Sure.

I'm using an Optima D34/78 battery:
http://www.optimabatteries.com/publi...eep_cycle.html
with 55 A/hr. This is overkill, yes, but I like the low internal resistance (0.0028 ohms) and supposed long life of the Optima.

Relays are bad because:
http://www.surepower.com/pdf/ebr_int.pdf

This is SurePower's corporate advertising to an extent, but it is also informative.

I bought a Hellroaring BIC95300A:
http://www.hellroaring.com/bic75300.htm

as an isolator. It is nice because it has no 0.7V drop going into the batteries as conventional solutions do, thus wasting less power and creating less heat.

I have installed all this and it works fine, but haven't gotten around to the computer yet, so I can't tell you if this setup is good for the long term.