See full version: 10 Best Marine Batteries For 2021: Starter; Deep Cycle Battery
The VMAXTANKS uses lead-tin alloys for its internal components. Tin has remarkable conductivity and produces a powerful and consistent electric discharge. The VMAXTANKS is a deep cycle battery so it’s designed for outputting a constant stream of electricity to power onboard appliances. The unique structure of the battery leads and cells retain a charge for a long time. The manufacturers claim that it can hold a full charge for up to 6 months without depleting. more
As we said, the ExpertPower is only a starter battery, not a deep cycle battery. If you try to use it as a deep cycle battery you will damage it. These kinds of lead-acid batteries are not designed for continuous discharge. If you do try to use it as a deep cycle battery, you will damage the components and it won’t be able to retain a full charge. more
If you are looking for the best marine battery for your smooth boating journey, then you likely have a lot of questions. Worry not, as we have scoured all the data and put together this list of the top 10 best marine batteries for your boating adventures.
One downside we noticed is the relatively low reserve capacity. It only has enough capacity to hold 90 minutes of charge. Since it’s a starter battery, this is not such a big deal as you don’t really need to worry about its continuous power output. However, there are starter batteries out there that have higher reserve capacity. here
We do recommend consulting with a mechanic or technician in the process of choosing an ACR and its features. [links]
Combine Voltage:
Under Voltage Lockout:
Automatic Charging Relays allow two banks on a vessel's alternator to be charged simultaneously from one unit. Doing so, keeps the batteries isolated when not charging. This benefit is useful in the case of one battery failing and having another battery as an emergency back-up. There are a few main styles to choose between:
Start Isolation (Optional): here
Start Assist: here
When your boat is operating under engine, the alternator is used to charge your batteries. In boats without a battery isolator, it is a common practice for the output of the alternator to be led to the load side of the battery selector switch, which allows you to choose which bank you want to charge. This is especially useful if one battery bank is fairly low while the other is still fully charged. here
Don’t want the hassle/responsibility of having to remember all the setting changes? We highly recommend that you consider installing a battery switch system that automatically manages this for you - such as a Blue Sea Systems “Automatic Charging Relay” (ACR), or their “Add-A-Battery” system – which can take all the worry and inconvenience out of battery management at a nominal cost. You can learn more about these automatic systems here. here
An AFD (alternator field disconnect) switch prevents this problem by disconnecting the power to the field windings of the alternator (cutting its output) before the battery switch is allowed to break the connection to the battery. This avoids the voltage spike that causes damage to the alternator diodes and voltage regulator. Conversely, the AFD switch will only reconnect power to the alternator’s field windings after the connection to the battery has first been re-established. [links]
Customers who are brand new to boating will often ask what that “big red switch” is for and why their boat needs it. This Navigator explains what battery switches are used for and how to know when you might need to buy one with the “AFD” (Alternator Field Disconnect) feature.
As stated, using the ALL position gives you the power of all of your batteries – which might prove handy if you’ve accidently run down your starter battery and need all the help you can get to start your engine. But what happens if you’re sitting at anchor, with ALL selected – enjoying your stereo, drinking your ice cold beverages and turning on the lights when it gets dark? While the extra power you get may sound great, you are now running the risk of depleting ALL of your batteries and may no longer be able to start your engine when you’re ready to leave the next day.
Diode-type battery isolators definitely have some disadvantages compared to the more modern electronic battery combiner devices available to us today. First of all, the finned case as shown is important because these isolators get quite hot when they are in operation. The diodes used to facilitate electrical isolation of one battery from another generate a significant amount of heat that must be radiated away by those cooling fins to prevent the diodes from burning out, causing component failure. That said, one of the most common causes of failure for diode type isolators is that they get mounted in a location on the boat (like engine rooms) with inherently high temperatures and/or poor air circulation.
Answer: You’re quite right, the device in the photo is indeed what is known as a diode-type battery isolator. This device has been a mainstay in battery systems on boats for the last 40 years or so. But to your question, they are not necessarily the best choice for modern systems.
Another cause for failure with these diode types is amperage rating mismatch. These devices all have to be rated to handle the maximum amount of amperage the system alternator is rated for. Often boat owners install higher output alternators and forget that if a diode type isolator is installed (quite often), then it may also have to be upgraded to match the higher amperage output of the new alternator.
Newer solid-state isolators don't suffer from the overheating and voltage-drop problems of the traditional diode-type units. here
Question: Recently I was checking out the engine room space on my boat and noticed the device in the picture here on the starboard side bulkhead. After checking my owner’s manual I discovered that the device is a diode-type battery isolator. I’ve been told that these may not be the best choice of equipment to use for the purpose of preventing one of my batteries from discharging into one of the other batteries in my electrical system. What are your thoughts on this, and what things would I have to consider if I were going to upgrade this isolator for a better design? more