Laptop batteries commonly have four 3.6V Li-ion cells in series to achieve a nominal voltage 14.4V and two in parallel to boost the capacity from 2,400mAh to 4,800mAh. That evening I measured batteries C through F to be 12.33, 12.39, 11.12, and 13.59 V, respectively (both chains must add to the same voltage). When another one fails buy either the big batteries like other posters have mentioned or use AGM. Here, overall emf of the battery is algebraic sum of all individual cells connected in series. Such a charger may be able to reclaim your bad battery but not very likely as it has clearly lost one cell that is probably shorted. The resultant internal resistance of the combination is,The current delivered by the battery is sum of currents delivered by individual cells. these batteries have some disadvantages but many more advantages and can and have lasted several decades with minimal maintenance. But then, I simply don’t understand what is the proposed advancement. You would send your vehicle out without being completely confident that the endurance would measure up to the previous run. Or will your inverter not accept that configuration? For moderately priced quality battery I suggest the Rolls S600. And storage could represent a serious bottleneck for large-scale solar, which would be unfortunate for us all. For example: two 6 volt 4.5 Ah batteries wired in parallel are capable of providing 6 volt 9 amp hours (4.5 Ah + 4.5 Ah). Over a 24-hour period, it only accepted 31% of the total charge (about half as much as did Battery C/D), and only contributed 22% to driving loads. Tom, if you figure out what happened to the cell, let us know! Batteries C and D are in parallel. Why not move the connection from the positive post of C to the positive post of E and vice versa. I have written before about the disappointment inherent in batteries. The failed battery proved itself to be practically useless the following night, and only really started accepting appreciable charge once Battery C/D reached its absorb potential and began refusing current. As a battery is an electrical equipment, it must have some electrical resistance inside it. Tuesday, November 20 is a picture-perfect example of what I like the PV system to look like. There are devices for doing that. So you are using an inefficient energy (coal) to make some thing even more inefficient (solar cell). Oh, well.). Perhaps a “battery doctor” could bring the battery back to an operable state. I believe they are called battery isolators and are used in marine applications. Ideally, battery chains C/D and E/F would contribute equally to sourcing or sinking current, and the dots would always be at 50%. Therefore, the overall output voltage of series packs remains the same. In almost all cases the car starts in the morning and then the battery fails completely that evening (or vice-versa). 99. When connecting two batteries, it is important to make sure the charge levels are similar (voltages are within 0.3 volt) before connection. One is parallel connections and other that your controller or inverter doesn’t do equalization charge. Isolating your two battery packs is a really good idea. The basic concept is that when connecting in parallel, you add the amp hour ratings of the batteries together, but the voltage remains the same. My advice is to buy 1 new battery and see how it goes. I may be carrying misconceptions that need to be cleared up. The “good” chain gets higher current during charging, better conditioning that chain while in absorb state. That was 2 1/2 years ago, so the batteries are now 12 1/2 years old… you can see the setup here How was the failed battery after the last equalization? The parallel matching problem was probably exacerbated by the small gage wires used for the connections. It did cross my mind in this case, but the red/green curves are so drastically different and un-mixed that I deemed context to be adequate for separation (e.g., a grayscale diagram would still be interpretable). During times when the current into or out of the battery is small, I do not plot the yellow dots, because they can become meaninglessly scattered when comparisons between small numbers are made. Doing that with a pulse generating charger would help to desulfate the batteries and that really does extent the life. I understand your point of trying to get how much energy you need and how you are willing to spend time on various aspects of your home energy and efficiency. Tired of having the dead battery act as an energy drain on the system, I finally pulled the plug on Battery E/F, disconnecting it from C/D around 18:00. So much for my rosy statement in September: At this point, I have sourced 1686 kWh from my four batteries in 30 months, or 422 kWh each. that would be: http://www.zappworks.com for information and pricing. The two candidate designs were (1) a Lithium-ish (one of that familiar) kept well below 100% charge and (2) a trickle-tolerant NiMH, trickled at roughly 2:1 charge:discharge. (I’ll look back at prior blog posts to better visualize the wiring when I have more time. Looks like we still don’t have a solution for the major roadblocks that we must solve before we can stop relying on energy that was stored away millions of years ago. And the flooded ones, I believe, are the worst of the bunch. We have a 48V battery bank using Deka brand AGM batteries. (However, if you are curious, by all means email me.). I have been told more than once to never place lead cell batteries directly onto a concrete floor as it accelerates voltage drain. So it seems like a really bum deal! The cold bottom can increase a tendency for the acid seperation. I was searching about molten salt batteries and came across a site that has a picture of a lead acid, with multiple plates and a subheading that stated that the solid parts are prone to cracking, etc, There is a limitation : battery aging probably means that one or the other battery in the pair will not have the same effective maximum depth of discharge. This new version of NiFe batteries can be recharged in two minutes and discharged in 30 seconds. So I have a sort-of love/hate relationship with them. I didn’t get to try. Whether or not battery repair is possible/effective, I judge it to be a near certainty that the revived battery would be poorly matched to its brethren. Because of this internal resistance of battery , there will be some voltage drops across it. As shown in the above fig, the (-ve) terminal is connected to the ( … If you feel like spending several times the price of the lead-acid solution, you stand a chance of enjoying a 10 to 15 year battery. They are 16-18% efficient when the sun is hitting them, and hopefully you receive 5-4 hours of sun. We know that we cannot scale up Alt energy to today’s usage much less to a growing demand as well. It comes down to storage. Using 4 6v batteries in series will solve your series/parallel mismatch problems. They can either be connected in series or parallel. ... Traxxas 3064x Wire Harness High Current ID Connection Parallel Toy. From an electronic point of view, I’m starting to think that having to match the voltage in parallel is simply bad for your batteries and the ideal would be to find a way to use them as current sources, and not voltage sources. I spoke with Deka batteries and they said that after 1 year I could replace the battery with a new one and that was OK After 1 year it gets more risky. Sunny weather, plenty of time spent in absorb state (battery voltage plateau, while solar utilization scales back to accommodate), loads cranking away doing their thing, and the yellow dots behaving reasonably. This voltage is generally referred as electromotive force or emf of battery. Sure, using a two-way electricity-fuel conversion process (such as a hydrogen fuel cell and water-electrolysis rig) /alone/ would be a step backward from lead-acid for the foreseeable future. The good battery from the failed bank can be rotated into the old bank to extent the life of that bank as long as the one on standby is put on a float charger to keep it from killing itself. I would bet that a serial only solution would be more robust, especially if you used Next time, AGM might be a better investment, or else some really extremely heavy duty, big, long service flooded units. The available capacity from one cycle to the next could suddenly dive. It’s interesting to imagine the “sufficiently smart” charger that would take that battery out of service and send you a tweet demanding your attention. I would love to see you tackle bigger things like how long can this growth paradigm continue . Actually when load is connected with the battery, there will be load current flowing through it. Let me say up front that I am not a battery expert. Hi Tom. Using 4 6v batteries in series will solve your series/parallel mismatch problems. I did not have much time to characterize the problem that day, playing catch up on work from spending a few days away, and also having to write a blog post from scratch.