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Batteries
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Interstate SRM-24 12v 140ah Deep
Cycle Battery |
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Can wire these batteries to
make 12v, 24v, 36v, 48v systems.
If you can not pick up the
batteries in person we can work with you on getting them
delivered to you The prices below are for local pick up and
delivery. Please call if you are outside the Phoenix metro
area.
| BCI Grp # |
Interstate
Type |
RC
(Min.) 25A |
Warranty
(Mo.) |
Hrs. at Ampere
Load |
Dimensions
(in.)
L | W | H |
Weight
(lbs) |
Terminal |
| 5 |
15 |
25 |
| 24M |
SRM-24 |
140ah |
30 |
16.4 |
4.6 |
2.3 |
11 | 6-7/8 |
9-1/2 |
46 |
Auto/Stud posts |
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Interstate SRM-27 12v 160ah Deep
Cycle Battery |
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Can wire these batteries to
make 12v, 24v, 36v, 48v systems.
If you can not pick up the
batteries in person we can work with you on getting them
delivered to you. The prices below are for local pick up and
delivery. Please call if you are outside the Phoenix metro
area.
| BCI Grp # |
Interstate
Type |
RC
(Min.) 25A |
Warranty
(Mo.) |
Hrs. at Ampere
Load |
Dimensions
(in.)
L | W | H |
Weight
(lbs) |
Terminal |
| 5 |
15 |
25 |
| 27M |
SRM-27 |
160ah |
30 |
17 |
5.2 |
2.6 |
12-3/4 | 6-3/4 | 9-1/2 |
53 |
Auto/Stud posts |
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An Introduction to Marine/RV-Deep
Cycle Batteries
There are many misunderstandings regarding marine/RV-Deep
cycle batteries. This booklet is designed to clarify
terminology and misconceptions and to assist you, the
customer, in 1) making an informed decision regarding proper
usage, 2) extending overall battery service life, and 3)
maintaining battery performance at optimum levels.
Deep Cycle Batteries
The term “deep cycle” refers, in general, to a battery that
has the capability of deeply discharging hundreds of times.
How does it differ from other batteries? An automotive
starting battery is manufactured specifically to provide a
quick burst of energy thousands of times in its lifetime
while only being able to deeply discharge less than 50
cycles during its life.
Proper Deep Cycle Application
A marine/RV-Deep cycle battery can be used for various
applications including boats, motor homes, sail boats,
travel trailers, tent campers, etc. Anytime an application
indicates a need for batteries which can provide repeated
deep discharge, you need marine/RV-deep cycle batteries.
 What
is a Cycle?
A cycle refers to one battery discharge and recharge of any
depth (See Figure 1). The amount of battery discharge (in
percent) compared to its full capacity determines the need
for a shallow, moderate or deep cycle. This is appropriately
called battery depth of discharge (DOD) and is measured in
percent. For example, 40% DOD indicates a battery has been
discharged by 40% of its total capacity and has a 60% state
of charge remaining.
Types of Cycles
There are three primary types of battery discharge cycles:
shallow, moderate and deep. These terms help us to
understand the type of cycling that batteries are required
to experience. To clarify, let’s take a look at all three
types. Shallow cycles occur when only a small percent of the
total battery capacity is discharged. Following that same
line of thought, moderate or deep cycles are discharged by a
higher percent of the total battery’s capacity. (See Figure
2).
 Ratings
and Specifications
Marine/RV-deep cycle batteries have rating specifications
which include cold cranking amps (CCA), marine cranking amps
(MCA), reserve capacity (RC) and ampere hours (Ah). RC and
approximate Ah ratings may not be listed on the battery
decal. However, they are available through your local
Interstate Batteries distributor. Unless specified, the Ah
ratings are based on a 20-hour discharge.
Cold Cranking Amps (CCA) –
The amount of current (amps) a battery at 0 degrees
Fahrenheit (-17.8 degrees Celsius) can deliver for 30
seconds and maintain at least 1.2 volts per cell (7.2 volts
for a 12 volt-battery).
Marine Cranking Amps (MCA)
The amount of discharge current a battery tested at 32
degrees Fahrenheit (0 degrees Celsius) can deliver for 30
seconds and maintain at least 1.2 volts per cell (7.2 volts
on a 12 volt-battery).
Reserve Capacity (RC)
The amount of time a battery can deliver 25 amps at 80
degrees Fahrenheit (26 degrees Celsius) without falling
below 1.75 volts per cell (10.5 volts on a 12-volt battery).
Note: Interstate Batteries uses the RC rating established by
Battery Council International (BCI). Some manufacturers use
a 15 or 22-amp discharge rate rather than 25-amp discharge.
The lower discharge level allows a higher number of minutes
to be displayed (on the battery label) which does not
reflect the true RC minutes at a 25-amp discharge.
 Ampere
hours (Ah)
Tested at 80 degrees
Fahrenheit. It is the amount of current (in amps) a battery
can deliver, multiplied by the amount of hours, without
falling below 1.75 volts per cell (10.5 volts on a 12-volt).
Most marine/RV-deep cycle batteries are rated on a 20-hour
discharge rate. Example: a 100 Ah battery can deliver 5 amps
for 20 hours (amps x hours = Ah).
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