Series-Parallel Switch

This java app is an analog circuit simulator. You build circuits from a wide variety of components or pick (and modify if you desire) any of numerous pre-made circuits (from tesla coils to CMOS NAND).

Instead of a static diagram, you can see how is work, and study the effects of variations made to the circuit.

Analog Circuit Simulator Applet

I hope you find it as useful as I have.

Thanks; looks like a good site! Apparently I have to get Java before I can use it, but I didn't see the series-parallel switch listed in the index. How is it labeled?

I use four batteries in series to get 48 volts for my vehicle while running 12 volt accesories by simply tapping off of the first battery positive post, the second battery positive would yield 24 volts and so on all the way to my 48 volt output on the fourth battery.

What do you do to compensate for different current draws for different batteries?

Do you use a common ground, or do the separate systems have separate grounds??

The trick here is to maintain 14V charging voltage while providing 24V for the starter motor. These switches are common for diesel trucks.

http://www.zafr.com/trucktcom/parallel_sw.htm

The above may explain how they work.

Here is one such device that I purchased for my boat - in order to operate a 24V windlass in a 12 V system.

http://www.texasindustrialelectric.com/relays_1119845.asp

Sweet!!!!

There's a market for a solution like that here.....

good morning sir

I understood ,,you need to operate two systems by two batteries ,,,one need the two batteries in parallel for lights,,,etc,,,,and the other need the two batteries in series for motor,,,,and you need a switch to convert from one to another

excuse me sir,,,you don,t need a switch,,,you need a circuit to fulfill your need to operate the two systems in the same time,,,,is that is your need?

please tell me,,,and I can think with you for solving that problem,,,,

,,,,,thanks,,,,,,,,,ahmed,,,,,,

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I've just finished jibbering to one of my mates about this and he informs me that his Toyota Landcruiser has this arrangement as standard. A cold weather heavy duty option apparently.

So, should be able to find the complete relay set in the market ready to connect with little hassle.

Just need to watch where the alternator output wire is connected...direct to battery positive or to the battery cable on the starter solenoid. Not totally blunder proof but not too hard if one is mindful.