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You can increase or decrease the maximum charging current of your battery by changing the values of  resistor R2. If you have noticed the table, for you to have a maximum charging current of 1A you need 0.7 ohm R2 rated 1W. Note: You can increase the value of charging current as high as 50A if you replace the PMOS Q4 with higher power capacity and replace the value of R2. Day in, day out, we couldn’t live the life we enjoy in the 21st century without lead-acid batteries. A growing trend in modern car design is the increasing use of the primary automotive battery for purposes other than starting the engine.
Minimal shedding of the material from the battery plates, resulting in significantly increased lifespan.
Longer life span: Battery does not “age” in the same way as conventional technology batteries.
Totally spill- and leak-proof: Complete fitment flexibility and safety (can be mounted in any position except inverted). The battery SOC or “State of Charge” in the car is no longer kept at 100% but instead the SOC is about 70% and Cycling takes place around this SOC. As a leading manufacturer we will be presenting an increased range of AGM + cycle-proof starter battery (EFB)+ Auxiliary AGM ( ETX ) to the Aftermarket in autumn 2011 in order to justify our position as a full supplier of batteries for micro-hybrid applications! At present Premium class manufacturers such as Audi, BMW, Porsche, VW, Mercedes use AGM batteries such as Banner Running Bull AGM. EFB ( Enhanced Flooded Battery) — technology “Made in Austria” For Micro Hybrid vehicles with simple Start I Stop systems.
Large volume producers such as Ford, Fiat, Vauxhall use simple start I stop systems for smaller cars. Many vehicles with a large power requirement need an extra’ Back Up ‘battery to support the start I stop system or to support other safety features. Look for stickers like “AGM”, “VRLA” or “EFB” in order to find the fitting replacement battery. If a standard flooded battery is used in an Stop & Start application, the battery will face enormous stress. Diehard platinum marine battery sears., Diehard platinum marine battery group size 31 (price with exchange) maintenancefree this group size 31m battery is ideal for use on your recreational marine vehicle. What agm marine batteries hull, The hull truth boating and fishing forum the hull truth is the world's largest free network for the discussion of boating & fishing. I put together the following chart which indicates the state-of-charge (percent) as it relates to battery voltage or specific gravity. How I determined the voltage values: I researched as many battery manufacturers that I could find regarding their own published SOC data.
Note: Voltage measurements are only approximate to determine SOC, and measuring battery voltage is NOT the most accurate way to do this (there are variables under varying circumstances).
Note: For longer battery life, batteries should remain in the green zone (40% or more SOC). Note: The 100% voltage is NOT the recommended charging voltage (which will be higher, and multi-stage). If the gravity of each cell stays relatively the same (usually all in the green) does that mean that I don’t need to equalize that battery?

The reason I ask is: I have 90 watts of harbor freight panels, run thru a sunsaver controller that charges 2 wally world deep cycle batteries and the gravity has almost never been below the green level, and I never really have had to add much water. My other set up has about 750 watts of poly panels, run through a xantrex 30 amp charge controller charging a trojan 12 volt golf cart battery. I guess my question is do I need to do this since the wally world batteries always seem to be in good shape as per hydrometer readings? I built an off-grid system for my home and have expanded and maintained it myself over the years, so that is my knowledge base. Also, NEVER combine different types, or age, or widely differing state of charge of your batteries when charging.
Thanks Carl, and as you insinuated, there are variables, including temperature compensation measurements and others. Saw this as I was looking for a SG to SOC chart and thought I would make a couple of comments. In conventional vehicle designs, batteries are tasked with supporting ever-increasing key-off loads and providing large amounts of supplemental energy when vehicle demands exceed alternator output.
As a result, modern car batteries are increasingly in situations of heavy discharge as part of normal vehicle operation.
These vehicles are fitted in the main with EFB ( Enhanced Flooded Batteries) such as the Banner Running Bull EFB.
Manufacturers such as Volvo, BMW, Mercedes use a small AGM battery such as the Banner Running Bull Back Up AUX type. Depending on the car and the driving behaviour the average lifetime will be just a few months. Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery, and battery banks of 24 and 48 volts. Some were slightly different from each-other with regards to their SOC values, however I averaged all of them together to come up with a chart which represents what I believe to be a good general indication. A more accurate method is to measure the specific gravity of each cell within the battery, however for many batteries this is difficult or impossible (AGM batteries, for example).
Occasional dips into the yellow may not be harmful, but continual discharges to those levels will shorten battery life considerably. Just thought it might be helpful to add that one tool I’ve found useful is the little floating balls thing for checking individual cell status in lead acid batteries. I mainly use this system for 12 volt water pumps,a few LED’s and cfl lights and occasionally power tools. My immediate thought about the differences in your two battery banks is that the wally world batteries are newer, or less heavily used than the Trojan. I do off grid solar for a living, 25 years now and I sent a customer the link to this chart to give him an extra tool to keep tabs of his system.
The charger is also automatic, meaning it turns off automatically when battery is fully charged, thus protecting it from damage. Measuring and knowing the SOC of a battery or battery bank is useful when applying towards alternative energy, or any other situation where you need to know its condition. Many (most) alt-energy systems incorporate a DC-shunt which keeps track of SOC by monitoring the current flow in and out of the battery or battery bank, which is a very accurate way to track state-of-charge.
To be somewhat accurate, the battery should be in that condition for an hour or two before taking a measurement, while for a more accurate measurement you should wait 6 hours up to 24 hours.

Generally speaking, the less you discharge the battery before recharge, the longer the battery will last.
The Trojan sounds like it is getting old, and needs more frequent watering and equalizing to keep it functioning. The one thing I would disagree with somewhat from your well written article is concerning the accuracy of state of charge meters. For more possible values, you can use the parallel resistor calculator to make calculation easier.
Most alternative-energy systems are designed to keep the battery bank at least 50% or higher. When batteries are in series they do not necessarily charge at the same rate and can become imbalanced. In reality, these batteries are not the same specs(even same brand or type)I suggest try using 12V charger to charge your battery. You’d find these on boats or campers, where they’re used to power accessories like water pumps, TV, winches or lights. It is set to equalize every 30 days, however sometimes I have to do it more than that, to bring them all back to green.
The plates may have become heavily sulfated enough that the equalize mode can’t get it all off into solution.
The equalizing charge ups the charging voltages in order to get enough voltage to the lesser charged batteries in the series chain. They deliver a lower, steady level of power for a much longer time than a starting battery. I combine the batteries whenever we lose power for more than a few hours so we can run TVs, fans DVD player and lights etc.
The standard meter for years has been the Tri-Metric meter but I finally gave up on using them because they arent very accurate unless fine-tuned beyond the level most homeowners are capable of understanding. Yes it will over charge the higher charged batteries, which is why the equalizing charge is only applied for a short time, however if the system uses a single battery equalization is not required and can be detrimental. You should probably start saving your shekels for a new battery because that one is not going to live much longer.
It doesnt help that the manual makes little sense to the layman or that the meter cant read battery voltage and often keeps compounding small errors into bigger ones. It would be wise to buy a desulfator unit for your batteries in order to reverse sulfation of the plates after long periods of less than 100% charge.
The meters that you can get that take their info from the inverter or in the case of Midnite Solar from the charge controller are more accurate because they temperature compensate but they need fine-tuning as well. Just yesterday a customer called because his inverter shut down at 23 volts, a definite low battery but the SOC meter claimed he was at 81% full.
I sent him a link to your chart and told him to call Magnum tech support to learn to tweak the meter. My concern actually is if two bat rated 12V (open circuit voltage) each but 1 has 1ohm (value is for illustration purposes only) resistance while other has 0.1 ohm.

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