**Ohm's law** states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship:

{\displaystyle I={\frac {V}{R}},}

This chart shows the relevant equations used when calculating the size of a battery bank and the sufficient charge source(s):

E2 / R = P (Volts squared / Resistance = Power)

We know that Rolls 6-volt **S6 L16-HC** has a rated capacity (20 Hr AH rate or C/20) of **445 AH** (current).

How many Watts of stored energy is this?

Volts x Current = Power

**6V x 445 AH (C/20) = 2,670 Watts** of total stored energy.

A **24V** series string of 6-volt **S6 L16-HC** batteries (4 x S6 L16-HC connected in series):

**24V x 445 AH (C/20) = 10,680 Watts** of total stored energy.