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.
#BATTERY PULSE CHARGER CIRCUIT FOR USE WITH STANDARD CHARGER FULL#
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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