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Best 3 Bank Onboard Marine Battery Charger 2021 [Review]: How To Use Properly?

Are you miserable looking for the best 3 bank onboard marine battery charger? Can’t make a decision because there are too many models of marine battery charger available in the market? We are here to solve this problem for you.
We have spent a great deal of time and effort researching and selecting the best 3 banks onboard marine battery charger. We researched and used multiple models to choose the best, from big brands like ProMariner to smaller ones.
Here are 3 best marine battery charger according to our reviews. We have selected the best 3 out of 10 banks onboard marine battery charger. Reviews are based on objective real experience.

Top 3 Best Bank Onboard Marine Battery Charger 2021 [Review]

#1 ProMariner 43021 Battery Charger Prosport 20 Amp (Editor’s Choice)


This is a heavy 3 bank onboard marine battery charger that we particularly liked during our research. This model has quite a bit of what we were looking for in a 3 bank onboard marine battery charger.
We will not go into too much detail on the specifications of this marine battery charger as the manufacturer has clearly provided them with them. We’ll just cover the features that we love about this model.
With a capacity of 20 Amp this battery charger can quickly fully charge marine batteries in a short time. This model is also designed with distributed charging technology to shorten the full charge time for any heavy marine battery.
Aside from that, we also love this model’s purely digital microprocessor controller. It makes the control, installation and handling simpler and much faster.
Especially, this 3 bank onboard marine battery charger is water resistant and effective against mechanical shock. That helps prolong the life of the model. It is also almost half lighter than previous older models.

#2 NOCO Genius GEN3, 3-Bank, 30-Amp (Fully-Automatic Charger)


We love this 3 bank onboard marine battery charger from NOCO for its durability and robustness. You can barely find an affordable model that comes with a surprising longevity like this one.
The manufacturer has also provided the full specifications of this model. It is a 3 bank onboard marine battery charger especially effective with ight-weight charger. Besides, its high frequency is also a plus for compression chargers.
In terms of design, this model appears to be completely sealed. It does not allow water or any other solution to seep into the inside. The manufacturer carefully machined it so that this model could be strongly waterproof.
It is also resistant to mechanical shock and is not easily destroyed by external forces. You can also rest assured because it has limited ignition, limited ability to cause fire.
The combination of high technology and serrated construction is also a big plus for this model. It can flexibly adjust, charge, maintain and diagnose marine batteries. The smart processor does a great job of monitoring and managing power, battery and charger.
However it takes a lot of time to install this 3 bank onboard marine battery charger. For starters, you can learn how to install through social networking sites.

#3 Dual Pro 15 Amp/Bank Professional Series 3 Bank Charger (Great Craftmanship)


Dual Electronics is a manufacturer you can trust and this 3 banks onboard marine battery charger from them is an option that you should add to your list of priorities.
We are very pleased with this model as it helps to protect and prolong the life of marine batteries. This model is packed with a lot of features for safe marine battery protection and you will also be pleased with its design.
This model has many features such as temperature control, reverse polarity protection or automatic shutoff to ensure the marine battery is always well protected. You don’t have to worry that this model will break or explode when it overheats.
In particular, the reverse polarity protection not only protects safety for marine batteries but also protects the crew safety. It will prevent electric shock and other accidents from happening when you try to touch it while active.
When the marine battery is fully charged, this model will automatically shut off to ensure the life of the marine battery is at a stable level. This is its one big advantage.
What is more, this 3 bank onboard marine battery charger is also shockproof, anti-vibration and waterproof. It also comes at an ideal price.
Overall, this 3 bank onboard marine battery charger had no major drawbacks and it consistently made us happy during our research.
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How to Use Marine Battery Charger Properly?

To get a battery running most efficiently, the battery charging is one of the important factors to help the battery operate most efficiently and durable. Because of this demand, the battery charger was born and is being improved more and more with more features.
But really everyone understand completely about the battery charger as well as how to use it? The following article will summarize the safest and most effective use of battery chargers for everyone.
First we have to look at the model. How to choose the battery charging current is the same as how to choose the battery discharge current. According to the IEEE standards and manufacturer’s recommendations, the charging current will be selected as follows: – For alkaline Ni-Cd batteries: Charge = 0.2C5 (A).
For example, an alkaline Ni-Cd bottle with a capacity of 100Ah, the selected charge current is 0.2 * 100 = 20A. – For battery Lead-acid (open & closed): Isac = 0.1C10 (A). For example, a 100Ah capacity lead-acid bottle, the charging current is selected as 0.1 * 100 = 10A.

#1 Automatic battery charger

Step 1:
Place the charger of the charger in the Min position.
Step 2:
Switch the voltage level selection switch of the battery to the position corresponding to the rated voltage of the battery to be charged (depending on the design of the charger, it can be a lever or a knob), for example, a 6V bottle, we choose the voltage level. on the charger is 6V.
Step 3:
Check that the electrode of the charger and the electrode of the battery are the same polarity, that is, the terminal (+) of the charger must be connected to the terminal (+) of the battery and the terminal (-) of the charger must be connected to the terminal ( -) of the battery.
Usually, we just need to look at the symbols on the charger and the battery to determine the polarity. Then connect the charger to the battery according to the correct polarity.
Note: in case of loss of electrode symbols, you must use VOM to accurately determine the electrodes of the charger and battery before connecting, absolutely avoid the case of false polarity.
Step 4:
Turn on the power switch.
Step 5:
Adjust the battery charge current with the charge current knob until the charge current displayed on the charger Ammeter is 0.1C10 (A) for Lead-Acid batteries and 0.2C5 for alkaline Ni-Cd batteries.
For example, the 100Ah lead-acid battery you need to adjust the charging current is 0.1 * 100Ah = 10A. Depending on the capacity of the charger, we can adjust the maximum charging current.
Step 6:
Then wait until the battery is full, the charger will automatically disconnect.
#2 Conventional battery chargers
Step 1:
Place the charger of the charger in the Min position.
Step 2:
Check that the electrodes of the charger and battery electrodes are the same polarity.
These first two steps are nothing to change compared with automatic battery chargers.
Step 3:
Turn on the power switch and the circuit breaker.
Step 4:
Determine the booster charge voltage and the floating charge voltage of the battery to be charged.
With the charger there is no automatic mode. Depending on the type of battery you are using, to get the most accurate results, you should see the boost charge and floating charge voltage on its own datasheet.
Note: The voltage we measured on 2 poles of the battery after it has been fully charged and left open circuit is also the voltage drop in the table above.
Step 5:
Perform the charging process according to the following 2 stages
State 1:
– Adjust the charge current knob on the charger so that the charge current is 0.1C10 (A) for lead-acid batteries and 0.2C5 for alkaline Ni-cd batteries, for example the 100Ah lead-acid batteries you tune The charging current is 0.1 * 100Ah = 10A.
Note because the battery will retain a very large current when the battery starts charging, so at the beginning of the charging, only slightly increase the knob, should not increase the knob too quickly, which is easy to cause overcurrent damage.
– Watch the charging current displayed on the Charger Ammeter to adjust the charging current knob, to keep the charging current at 10A during charging until the charging voltage displayed in the Charger Volometer reaches The boost charge voltage level ends with phase 1.
For example, a 6V battery, when the charger Volometer displays a boost charge voltage of 7.35V, we end phase 1. Usually phase 1 charging time is from 8-10h.
State 2:
– Disconnect charger and battery (leave charger circuit open).
– Adjust the charge current knob on the charger until the charger volometer displays floating charging voltage. Then keep the position of the charge current regulator and connect the charger to the battery according to the correct polarity.
For example, on a 6V lead-acid battery, you adjust the open-circuit charger voltage to a floating charge voltage of 6.51V.
– When connected, the voltage displayed on the volometer will be reduced and a charging current other than 0A displayed on the ammeter.
We will continue to charge, the charging voltage will increase slowly until the floating charging voltage has been adjusted previously and the charging current will slowly decrease to 0A (in fact, a few tens of mA). End of state 2. Usually phase 2 charging time is from 1-4 hours.

Final Verdict

If you are still not satisfied with the best 3 banks onboard marine battery charger that we have selected, you can choose another model that is more suitable for you. Set the specific criteria you want in an ideal marine battery charger.