# formulating equation

Discussion in 'General Electronics Chat' started by NY10, Sep 23, 2010.

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1. ### NY10 Thread Starter Member

Jul 30, 2010
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Hi, all

I am trying to come up with some kind of formula that will effectively or optimize the battery usage.

I have two batteries, primary 24v and secondary 24v.

I am using these two batteries simultaneously. For example, 12v from primary and 6v from secondary.

Does anyone know how to come up with effective or optimizing formulas for this type of situation ?

Following is information;

Primary battery
http://www.all-battery.com/rectangul...drobots-1.aspx

Secondary battery
http://www.all-battery.com/onenimh24...androbots.aspx

variable definitions:
splitper = percentage of primary battery used that cycle. 1-
splitper is secondary battery percentage
dutyCycle = period
thorttlepos = throttle position
hightime_p = time primary battery is high for that period
hightime_s = time secondary battery is low for that period
lowtime_p = time primary battery is low for that period
lowtime_s = time secondary battery is low for that period

how variable are currently used:
hightime_p = dutycycle*throttle pos*splitper
hightime_s = dutycycle*throttle pos*(1-splitper)

lowtime_p = (1-dutycycle)*thottlepos * splitper
lowtime_s = (1-dutycycle)*throttlepos * (1-splitper)

I need to find formula for split percentage. That depends on throttle
pos (position) and secondary battery
It needs to be such that the average output voltage is the same for
the case where there is only 1 battery being use and if there is both
batteries being used

I hope this give you enough information to point me to right direction or help me out.

Apr 20, 2004
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