A trickle charger provides a relatively small amount of current, only enough to counteract self-discharge of a battery that is idle for a long time.  These batteries last longest if the battery is frequently charged; fully discharging the cells will degrade their capacity relatively quickly, but most such batteries are used in equipment which can sense the approach of full discharge and discontinue equipment use. Types of Chargers. If your trying to design a system to supplement energy coming off the batteries then I suggest reading our article Solar Systems the Right Way. However, the closest we carry is an Eagle 72v 12 amp charger. Since the Law of the Conservation of Energy applies, then the input power (Wac) must be equal to the output power (Wdc), then since the input voltage in this case is 120Vac and output voltage is 12Vdc, the ratio is 10:1, which means that the current (Amps) must be in inverse proportion to maintain the equal power. Previous set up had 2 positive wires (6g i think) coming from bow and connected to battery 1 + and the other to battery 2 +…why? Researchers at the Korea Advanced Institute of Science and Technology (KAIST) have developed an electric transport system (called Online Electric Vehicle, OLEV) where the vehicles get their power needs from cables underneath the surface of the road via inductive charging, (where a power source is placed underneath the road surface and power is wirelessly picked up on the vehicle itself.. Richard An excellent and very informative article, thank you! Simple lead acid batteries or glass mat are generally used. If you look into our 12 Volt Smart Battery Chargers: 5 to 10 Amps Section. Having any sort of connection (even unplugged) to a battery will technically cause a very minimal discharge, but it is so insignificant, that I wouldn‘t worry about it if I were you. Bandit Can I use a standard (1-stage) charger, set on 2amps to charge my new AGM 12AH motorcyle battery for initial use until I get a smart charger? Heat is a sign of resistance, which means the current coming from the charger isn’t being accepted somewhere along the line. A power bank is a portable device that can supply power from its built-in battery through a USB port. Thank you. 1) during use, and while idle). They usually recharge with a USB power supply. The choice of charger circuit technology is usually a price - performance trade off. Lithium, NiCD, Sealed Lead Acid? Next, either way your 35 AH rated battery would not work, as you don’t want to discharge your battery more than 50%. Solenoids separate all three until the ignition is on.  When stored after charging, lithium battery cells degrade more while fully charged than if they are only 40-50% charged. Several places in your material and others I‘ve read, the statement is made that one should get the highest Ah rating they can.  Others are open source hardware. They may be fully compliant USB peripheral devices adhering to USB power discipline, or uncontrolled in the manner of USB decorations. The best are universal (i.e. 8A) I could safely charge the same battery in about 100 minutes based on your formula – is that correct? Its not listed anywhere on the battery itself, nor is it on the invoice. Use the link below to see our large selection of battery chargers and 12v/24v trickle chargers. The problem is, the magnitude of "delta-V" can become very small or even non-existent if (very) high[quantify] capacity rechargeable batteries are recharged. Some examples follow: Switch Mode Regulator (Switcher) - Uses pulse width modulation to control the voltage. BatteryStuff Tech For charging off a generator we recommend that you pick a charger that does not have an amp rating that exceeds 25% of your total amp/hr. Most such chargers have a cooling fan to help keep the temperature of the cells at safe levels. Alternator: 13.65 to 15.0 volts Some chargers use "negative pulse charging", also called "reflex charging" or "burp charging". I understand that when connecting the same batteries in parallel, it will have the same voltage but will double up in the Ah. I guess it might be better for the battery life but was wondering if it could handle it). I don‘t get it!! Battery cases are small power banks attached to the rear side of a mobile phone like a case. 50% depth of discharge per cycle is our recommendation because it‘s the most cost effective solution. These batteries require a fast charge cell voltage of 2.40V for frequent heavy discharge.  In June 2009, 10 of the world's largest mobile phone manufacturers signed a Memorandum of Understanding to develop specifications for and support a microUSB-equipped common External Power Supply (EPS) for all data-enabled mobile phones sold in the EU. Simple chargers of this type must be manually disconnected at the end of the charge cycle, and some battery types absolutely require, or may use a timer, to cut off charging current at some fixed time, approximately when charging is complete. What are the types of batteries your wheelchair uses? Ivan Uriegas Hello, I bought a 12v 22ah VRLA battery (to run a 12v 13a water pump), I also bought a smart charger (a Motopower 12v 2a) to charge/maintain it. , For mobile phones with removable rear cover, extended batteries exist. The demands light (ish) lighting, audio, limited TV, water pump. volts that the AGM batteries should be charged at? Nick Bointon We have a catering trailer which has a bank of 6 × 120amp/hr 12v batteries powering an 4000w inverter to run fridges, microwaves etc. A pulse charge is said to be used to provide any type of battery with an additional charge. Should contain only letters, numbers, and (' - .)! High-rate chargers may restore most capacity much faster, but high rate chargers can be more than some battery types can tolerate. If your just looking to maintain a fully charged battery pack with no draw coming off the batteries I would generally recommend a panel similar to our Solarland 12v 30 Watt Panel for your capacity. Most fast chargers are also capable of acting as standard overnight chargers if used with standard NiMH cells that do not have the special control circuitry. The other main reason to equalize a battery is to cause the sulfation to dissolve back into the electroylte, however not all AGM battery manufacturers recommend this processes, as some AGM batteries are not meant to withstand this type of charge. Lead acid batteries work with all kinds of battery charger as long as they're suitable, but if you have a gel or calcium battery, or an AGM/EFB normally found in cars with stop/start functions. Most mobile phone chargers are not really chargers, only power adapters that provide a power source for the charging circuitry which is almost always contained within the mobile phone. Im looking for a fast charge time, because occasionally the charge source will be the gas generator, and the less that runs, the better. Thankyou Steve. Some are programmable by the end user through a CAN port, some have dials for maximum voltage and amperage, some are preset to specified battery pack voltage, amp-hour and chemistry. I advise that 25% of your capacity should be the max charge rate you should use. BatteryStuff Tech If your 48 volt system is used as a single unit, it‘s best to charge it altogether the same way. Lead Acid? China, the European Commission and other countries are making a national standard on mobile phone chargers using the USB standard. This may be outside your subject matter expertise, or depend on specific unit features, but I also need to know if built-in inverters draw power when nothing is plugged into them. Thanks in advance, Ed. Kym I am in the market for a 24v 50A multi stage battery charger as I am looking around I found one that I thought was good but it says it is only good for 40 - 500Ah. The valve regulating mechanism allows for a safe escape of hydrogen and oxygen gasses during charging.Typical absorption voltage range 14.2 to 14.5 volts; typical float voltage range 13.2 to 13.5 volts.VRLA batteries are common and found in many applications, such as medical mobility scooters batteries and toy and alarm batteries. I‘m going to have to upgrade to a 4-bank charger to do this. Charge until current drops below 1 amp. Electric vehicle battery chargers (ECS) come in a variety of brands and characteristics. We respect your rights to privacy and will not share your email information with anyone ever. Reason I ask: I use a smart charger that incorporates 8 steps in the charging/maintenance cycle. my plan is to swap the flooded for agm when funds allow. Since the OP wants it to last for 8 hours, then it seems that the AH rating of the battery would only need to be 460AH (57.5Adc*8H), or a Reserve Capacity (RC) rating of 1104 minutes (8hr*60mins/hr=480mins@25A*2.3 [since the battery has to supply 57.5 A instead of 25A]). Paul Mulvenna Excellent article. About the size of a large car battery. thanks for the article. The AC voltage x AC Amperage = The Wattage. You will find mountable, and portable chargers depending on your need. The charger I want to go to chargers at 30A, and I don‘t think it has a regulator (Protournament 300 Quad). I have a 5000W inverter and a 7500W gas-powered Kohler generator to produce AC when anchored/underway. BatteryStuff Tech The highest amp rated charger for your application would be a 3 amp charger, as you don’t want to exceed 25% of the amp/hr. If you require further information feel free to contact our Tech Department. . Such chargers are often labeled as a ΔV, "delta-V," or sometimes "delta peak", charger, indicating that they monitor the voltage change. Converter, 40 amp, has never fully charged the three units with the ignition on; nor even the house and genset batteries with the ignition off. Had I known it was going to take 12-hours to get a full charge I wouldn‘t have bought the Optima batteries. Our preference would be the USA made charger as they are more durable, last longer, and get the batteries to a fuller charger with its DeltaVolt technology. Other material says, for the type of low power/long usage above, one should use something with an Ah rating of only about twice what they would probably use in one session on average, so as not to draw the battery down too much in one night, but enough of the total so the cycling is deep enough to preserve battery life by the proper amount of cycling (or something like that ;-). We don’t mean physical size, but how many amp hours your battery stores. We are not anticipating this pump to be used very often. The chargers below represent a variety of charger types for multiple applications and battery sizes. Valve Regulated Lead Acid is often associated with AGM batteries. David Hardy I have a 24v trolling motor system and a 12v cranking system on my boat. This goes back to the old nickel-cadmium days where a simple charger applied a fixed charge of about 0.1C (one-tenth of the rated capacity) as long as the battery was connected. We have a honda 1000EUi generator which is1000w rated 900w. And on the 6 amp rate the regulated voltage is just under 16 volts near full charge. BatteryStuff Tech I would recommend a 12v 10 Amp charger for that battery. A phone charger is an important accessory for any battery-charged phone. These are larger internal batteries attached with a dedicated, more spacious rear cover replacing the default one. BatteryStuff Tech Many battery chargers, such as Battery Tender, Pulse Tech, and Battery MINDer use the 2 prong SAE type connector, which is popular for pig-tail style installations. Allen Dorak I just purchased a new V Star Custom 650. Art I liked the article, I just purchased a Evolution 1 Tent trailer and the prior owner installed 2 6v batteries for power and also installed LED lights. Other battery types cannot withstand over-charging, being damaged (reduced capacity, reduced lifetime), over heating or even exploding. patented 1997 I‘m trying to ascertain the best and best quality smart charger to buy from you for my motorcycle but have wondered if I need to worry about the fact that I live in a rural area with a lot of power surges. Email address should be formatted firstname.lastname@example.org. A typical intelligent charger fast-charges a battery up to about 85% of its maximum capacity in less than an hour, then switches to trickle charging, which takes several hours to top off the battery to its full capacity. This will determine what I recommend as far as good charge rate goes. If you’re not in a hurry, you can select a smaller charger. I have a newer sealed, maintenance free, mid-range (in terms of quality) standard AGM 12v deep-cycle Marine/RV battery. On the 10 amp rate the regulated voltage is just over 16 volts near full charge. One for the house batteries (in series), one for the port engine, and one for the stbd engine. Lithium-Ion and Lithium-Polymer batteries are most commonly used for power banks but don’t be surprised if other types start to hit the market before long. My partner lays on the trolling motor well more than I do: however, killing the batteries wasn‘t really the issue. Anywhere from 4 – 16 amps of charge rate should be fine. A whole range appliances may be plugged in whilst charging the battery. My question: Is the electrolyte, absorbed into the glass matting, in these AGM batteries subject to stratification in the same way that the electrolyte in a flooded wet battery is? Timer chargers were the most common type for high-capacity Ni-Cd cells in the late 1990s for example (low-capacity consumer Ni-Cd cells were typically charged with a simple charger). Brendan Kiely I can recommend the La Crosse Technology BC-700 charger. BatteryStuff Tech What are the AH (Amp Hours) ratings on the Optima batteries? Rick W This seems excessive. If the battery is not heating up, but the wire at the connection point is, i would try cleaning the terminals and ensuring you have a good connection. It charged fairly quickly to about 62% then plateaued off. I haven‘t been able to find anything on that question. Non-isolated: the battery charger has a direct electrical connection to the A/C outlet's wiring. In order to run that off of battery power you would need 883 AH at 12 Volts, ran through a 1000 watt inverter. It is 5 amps, 600 watts. The engine and generator starting batteries are all wet cell. If you look at your 3rd power rating it tells you the CPAP Machine can run directly off a battery with a rating of 12VDC, which is a 12 volt battery, and it will pull 6.67 Amps an hour. Thanks Art. Herb Korn Very informative. The 1st step is an automatic desulfation step. It says to use it on conventional batteries and maintenance-free AGM batteries. More info: http://best-gear.org/la-crosse-technology-bc-700-alpha-power-battery-charger/. Dave Bort hi my camper currently runs 2 100ah agm batteries and 1 110ah flooded battery .i have just installed a 100w solar pannel and 10a regultor how should i set the regulator …..for flooded or agm ? Your site is a fantastic resource! When the voltage on the battery reaches its outgassing voltage (2.22 volts per cell) the charger switches to the second stage and the voltage is held constant (2.40 volts per cell). However, some of our gel cell chargers will work well with the other battery types. Since the inverter apparently adds 15% to the power consumption, then the output current will then be 57.5Adc. Gordon I currently have a 24V set-up in my bass boat for the trolling motor. A 10 amp-hour battery could take 15 hours to reach a fully charged state from a fully discharged condition with a 1 amp charger as it would require roughly 1.5 times the battery's capacity. The electrolyte is not absorbed in a glass matte like an AGM. BatteryStuff Tech Not every smart charger will have the “voltage ramp up”. A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it. Lead–acid batteries will experience substantially longer life when a maintenance charger is used to "float charge" the battery. BatteryStuff Tech 16 volts sounds like it‘s too high, even for high performance AGM batteries. Your battery should not be hot to the touch, so the charger could be malfunctioning, or the charger is attempting to charger a battery that cannot accept a full charger and is not timing out. I have a Yuasa 1.5 Amp 5 Stage Battery Charger. Do you have any suggestions? Just make sure your connects are correct. The regulator in the alt. what kind of charger should i use? The charging protocol (how much voltage or current for how long, and what to do when charging is complete, for instance) depends on the size and type of the battery being charged. Power banks are popular for charging smaller battery-powered devices with USB ports such as mobile phones and tablet computers and can be used as a power supply for various USB-powered accessories such as lights, small fans and external digital camera battery chargers. What does the charger do differently in AGM mode? As some batteries reach their full charge, cooling may also be observed. The Vector high frequency battery charger and maintainer The Vector high frequency battery charger and maintainer is used to keep batteries in stored vehicles and battery applications at optimal capacity during the off season. A "smart charger" should not be confused with a "smart battery". The DC pulses have a strictly controlled rise time, pulse width, pulse repetition rate (frequency) and amplitude. 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