Victron energy BMV-600S Manuel page 22

20 h rating
Peukert exponent,
A Peukert calculator is available at
http://en.wikipedia.org/wiki/Peukert's_law
Please note that Peukert's formula is not more than a rough
approximation of reality, and that at very high currents batteries will
give even less capacity than predicted from a fixed exponent.
We recommend not to change the default value in the BMV, except in
case of Li-ion batteries: see sect. 5.
18
C 100 Ah (rated
=
20 h
t 20 h
=
2
100 Ah
I
= =
2
20 h
log 20
n
=
log 15
capacity)
5
A
log 5
−
=
1 . 2 6 1 . 2 6 1 . 2 6 1 . 2 6
log 5
−