By the same token, it can also deliver 1 amp of current,
for 100 hours.
This ability to cover a range of current draw
possibilities is what saves us.
There's a simple mathematical
formula that covers this, in fact:
Amp
hour rating (capacity)/current draw from motor = runtime
So,
lets say your motor was running at a low speed, drawing 5 amps from
your 100 Ah battery. Using the formula, we would divide 100/5 to get
a 20 hour run time.
Going the other way, if you're running wide
open and drawing 40 amps, the result would be 100/40, for a 2.5 hour
run time.
Motor Current Draw
A
motor's exact amperage draw rating isn't always easy to find, but it
will be available from the manufacturer. You can check the spec sheet
that came with the motor, or if you don't have that, check on the
internet
Most
manufacturers will only list a motor's maximum current draw at top
speed. That's really all they can do, but it's enough.
With that information, we can
extrapolate across the range, from zero to max, using that maximum
value as a baseline.
But
we don't run our motors at a constant speed for a defined time-span, do we?
We run them fast, slow, and an awful lot of the time, somewhere in
between.
Sometimes we don't run them at all.
You have to
understand that your power consumption is determined by the conditions,
and how YOU choose to run the motor.
For example, if you must power through a high flow river current, or against a stiff wind, you will require
a higher power setting and draw more current.
If you paddle
protected backwaters a lot, as I do, you may draw very little current
from the battery in a given fishing session.
So what's the
simple answer to how much battery you need?
Drum roll please:
There isn't one.
Take a look at the chart above, and notice the first word in the heading -
“approximate.”
Really, it all comes down to throttle
management. You can run at a moderate pace throughout the day, going
from spot to spot, using drifting, paddling, anchoring, etc., or, you
can run flat out for 2 1/2 hrs. and go to the other end of the lake.
But
the whole battery conundrum can usually be distilled down to:
Get
the physically largest deep cycle battery that you NEED, which
you can physically manage without throwing out your back, or upsetting the
balance of your boat.
This is different for each application.
For
trolling motor use in a small boat, for example, I generally recommend a battery with AT LEAST a
100 amperage hour rating, and a Group 24-31 case size rating.
In a kayak you may want a motor with a reduced thrust factor, and that could mean a smaller battery.
But
above all, know your motor's current draw and the battery's amp hour
rating.
From there, you can take what you've leaned here, do some
simple math and find out what you need for YOUR situation
And
that's a result!
Some Battery DO's and
DONT'S
Use
Variable Speed Motors
Using
a variable speed motor (vs. a fixed speed motor) generally results in
significantly longer run times. Variable motors are more energy efficient, especially at slower speeds. They are also
much more convenient as they allow you to dial in the speed to the
exact setting you want.
Actually, I'm not sure there are any fixed-speed motors available anymore. I haven't seen one, at least.
There are also new electronic devices
called “pulse width modulators” that feed the power to your motor
in high frequency pulses. This stretches out the battery life, and
they're worth considering if you want to add another tech project to
your system.
Use A Higher Voltage Motor
As
voltage increases, you can get the same power using less current. In
this way, larger
24v and 36v multi-battery trolling motor systems can provide the same thrust
as 12 volt motors with less current draw. This results in longer run
times.
The motors are more expensive, of course, and you need TWO or THREE batteries in series to pull off this trick, so
that might not be practical in YOUR situation.
But seriously long run
times are possible with 24v or 36v motor.
Don't
Fully Deplete Your Battery: Big NO – NO!
Running
a
battery “bone dry” on a regular basis will reduce the lifespan of
your battery.
Whenever possible, make it a habit to recharge your
battery(s) before they are completely empty.
Using a battery voltage monitor while on the water will help you know your battery's charge
level, and reduce the chances of unexpectedly running out of juice
miles from shore.
For lithium batteries, use a lithium specific monitor that reads in remaining amp
hours, and not just voltage.
Remember Your Batteries In The Off-Season
It's
really bad for batteries to be left uncharged for months at a time. It contributes to shorter battery life and reduced performance.
During the off-season, use a battery tender or battery trickle
charger to keep a small amount of current running through your
batteries.
Alternatively, you can re-charge your batteries every
month or so to ensure they retain a charge and don't sit empty.
Both
options will significantly increase the life of your batteries.
Don't
Mix
Battery Types
Resist the urge to mix old batteries with new ones. Ideally you want
multi-battery banks to be of the same age and type.
Charge
Batteries After Each Use
Leaving
batteries in a discharged state after use will decrease their
longevity and performance. So make it part of your routine to charge
them as soon as possible after you've used them.
If you are using
flooded, wet-cell batteries, also get in the habit of checking and
topping up liquid levels every time you use them.
Storage
Keep your batteries in a cool, dry place in the off-season and
maintain them in a charged state.
Connecting the
Battery
- Terminal connectors should be periodically examined
for signs of corrosion. Don't just look at 'em, or pour Coca-Cola all over 'em...Take them apart and clean them as needed.
Know what's happening there, and keep ahead of any problems with your
connections.
- The best way to hook
the motor to the battery is with large-lug, ringed terminals that attach
flat to the terminal with nut and bolt hardware.
If your battery has tapered posts,
make sure they are clean and bulldog tight.
If you have alligator clip connectors, dump them as soon as possible.
From there, have an
in-line circuit breaker, and use quick disconnects on the motor and battery if you want to remove them.
- Your wiring should be sized
appropriately.
Wire that is too small will not conduct current
efficiently, and will dissipate power in the form of heat.
Wire that
is too large conducts current fine, but it may cost you more than is
needed.
Each motor manufacturer recommends the proper wire size,
depending on how far from the battery the motor is placed. Since
we're not tossing out random info, here, I'm gonna tell you to find
out what wire sizes your motor manufacturer says to use... and then
follow those instructions to the letter.
- Keep your battery
clean and covered in use, and don’t leave it outside to freeze over
winter.
To really be honest, these things are easily as important as the battery itself.
FAQ
Q.
What do the "group numbers" on batteries mean?
A. The group number
indicates case size
dimensions.
This is important because you could maybe use a
somewhat smaller battery, and still get the same capacity as a larger
one. That's why its important to understand the amp hour
specification and how it applies.
Q. Is one brand better
than another?
A. Generally speaking, no.
Saying that will get
many brand loyal people worked up, but it is ALWAYS your
first priority to understand that battery current capacity / Motor
current draw = run time.
The
name on the case, where you bought it, it’s price, or even its
internal makeup are secondary, and may mean next to nothing.
There
may be those batteries with better warranties, or some slight edge in
materials, and certainly there's some great advertising hype
involved.
But the science, technology and manufacturing behind
batteries is well established, and plenty of people get YEARS from
their Walmart brand batteries.
Q. Can batteries go bad from
sitting?
A. Absolutely.
They lose a percentage of their
charge, month after month, just sitting on the shelf. This means that
the manufacturing date is important at the time of purchase. Look for batteries that are no
more than 6-8 months old.
And once charged and in service, they
should not sit around without being on the charger periodically to
keep them topped up. I cycle charge those not in use once a month,
and I rotate them into service through the season.
Q. Are
these batteries expensive?
A. Yes.
However, it depends on your
financial situation.
Some guys think nothing of having $4500 tied up
in lithium batteries, high-end chargers, etc.
Me, that’s my
fishing budget for the rest of my life!
So it's a different
expense for everyone.
For those of us with pockets of average
depth, plan to spend $1-$1.75 per amp hour for a decent AGM, deep
cycle battery. You can shop around and find sales, or deals, but plan
on that.
TIP: You can link batteries in parallel to gain
current capacity.
For example, I
use TWO 55 amp hour batteries connected in parallel to give me 110
amp hours. I get them for free, so its a no brainer to use them.
As
you can see, when connected this way, the current capacity is
additive.
This means each time you add one to the circuit,
in parallel, you add the new battery's current to the total.
So
you could buy one, now, to get you going, and literally double or
triple your run time by buying another next month!
Q.
How often should I charge the battery, and do I need a special
charger?
A. That's easy: charge it as soon after discharging it,
as possible.
Ideally, when you get it home from using it, you'll
put it on the charger straight away.
As for the charger, use a
charger that offers self-adjusting current levels, and a maintenance
feature. This type reduces the amount of current flowing to the
battery as it gets approaches peak charge, and then it shifts to
“charge maintenance mode,” what some people call a “trickle
charge.”
Finally no matter how careful and knowledgeable
you are – things can go wrong.
Because of that, I strongly urge
you to have a collapsible paddle on board, just case.
For
general information about trolling motor batteries, this will
help:
www.trollingmotors.net%2F86992071-picking-a-trolling-motor-battery
Thanks
to the following online resources for their presence and
information...
Dakotalithium.com
trollingmotors.net
wikipedia
https://www.crownbattery.com
Interstatebatteries.com
battlebornbatteries.com
As always, thanks for reading, and dont forget to...
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Tight Lines,
David
Palmetto Fly n Fish
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