![]() Google Patents US6977827B2 - Power system having a phase locked loop with a notch filter If the spec sheet is deficient in this area then, if you care, changing brands may be in order.US6977827B2 - Power system having a phase locked loop with a notch filter ![]() Reputable battery manufacturers usually have a good idea of what works with their batteries. Super patented chrome plated pulse methods MAY work better. (I have no association with Trojan - just admire their products)īattery university are usually not terrible although some choose to slang some of their stuff. Whatever Trojan Battery USA say is a good starting point. Otherwise, tried and true methods are in widespread use and probably preferable. IF a method is of clear capability, reasonably priced and does not damage the battery, then consider it. ) /ĭeciding which is which can be difficult to impossible. Pulse charging tends to lie somewhere in the realms of some mix of:Īdvanced real world science understood only by the illuminati (or technocrati) / Common sense / Accidental discovery that works, sometimes, sort of / Magic and-or Scam (oxygen free copper-crystals-phase-of-moon-bank-holidays-dead-fish-nsfw-ymmv-dnttah-ianal. Unless they are certainly superior and have no hidden problems, there may be no good reason to use them. Super 'patented' chrome plated pulse methods MAY work better. ![]() Standard well tried well documented methods usually are "not too bad". The technique does work, and can even use the battery's own power to do it! However there isn't much point applying it to a battery that is in good condition. Pulse charging aims to break the crystals down so they will dissolve faster and restore capacity. A sulphated battery loses capacity because there is less acid available, and it may also have reduced current carrying capacity due to the crystal's poor conductivity. The crystals have low solubility and are not easily dissolved by normal charging. This is the formation of lead-sulphate crystals that occurs when the battery is left in a partially discharged state for a long time. However it is possibly more useful for dealing with the second lead-acid battery problem - sulphation. Pulse charging may be able to charge at even higher rates without gassing if it can get a burst of current into the cell before it starts to gas. A charging system that is designed for AGM batteries can charge them a bit faster than normal SLA (Sealed Lead-Acid). However this increases pressure inside the battery, so it can only handle a limited amount of gassing. Current must then be progressively reduced to stop the voltage from rising, and the battery gets charged slower and slower (taking 20 hours or more to get a full charge).ĪGM (Absorbent Glass Mat) sealed batteries get around this slow charging issue by recombining the hydrogen and oxygen rather than venting gas. The reason this is a problem is that to prevent gassing the voltage must be kept safely below the point of electrolysis, so the battery can only be charged at maximum rate for a few hours. A 'flooded' or 'wet cell' battery can be topped up with deionized water, but sealed batteries cannot. Apart from the risk of explosion, the lost water needs to be replaced or the battery won't work properly. The first problem is that if voltage exceeds about 2.4V per cell the water in the electrolyte will break down into hydrogen and oxygen ( electrolysis). Lead-acid batteries suffer from two annoying problems. Experiments which have tried it report reduced battery life. ![]() Most solar-system charging is done with systems where the charge rate is limited by the solar panels, so you couldn't get too much pulse current if you tried.īurping the batteries is probably a bad idea. Most battery charging is done with pulses, from switch-mode power supplies. If the ambient temperature is low, you can use medium-higher rates for medium-length-periods when the battery voltage is low, because the battery voltage won't go too high until is is partly charged. ![]() You can use much higher rates for short periods because (1) If it's short, the battery won't over-heat, and (2), If it's very short, it's just charging the battery capacitance, so the voltage won't go too high. Particularly when you have cheap charging equipment that can't shape the charge curve, and/or Particularly when your real skills are at manufacturing batteries at a competitive cost, not battery chemistry, and you don't know any better. 1C charge rule is a rule-of-thumb to protect you from both of the real rules. There are two fundamental rules of battery charging: you shouldn't let the battery get too hot, and, you shouldn't let the voltage get too high. ![]()
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