The duration of Phase 1 is determined by the battery’s depth of discharge, the ratio of charger ampacity to battery capacity, and whether there are parasitic DC loads connected to the system. Although the duration of Phase 1 does vary, we are not concerned with this variation since, once the battery capacity, charger output, and DC loads are installed, we have no means to change the duration of Phase 1.

The duration of Phase 2, however, is of great concern to us, because the elevated voltage at which the charger operates in Phase 2 can achieve either good (charging batteries faster), or bad (overcharging batteries and causing rapid water loss and shorter battery life). Phase 2 is the area where applying more knowledge and better technology can pay big dividends.

The charger needs to operate in the boost voltage mode just long enough for the battery to reach a high state of charge, but no longer. Too much time in boost mode overcharges the battery, causing excessive water loss, excessive emission of flammable hydrogen gas, accelerated grid corrosion, and shorter battery life. Too little time in boost mode significantly extends charging time such that UL and NFPA mandated recharging performance might not be achieved.2 In the case of some NiCd batteries, insufficient boost charging prevents the battery from achieving its full rated capacity.

Unfortunately, there is no easy answer to how long the charger should operate in boost mode. The optimal solution changes each time the battery is charged. Differing depths of battery discharge, the health of the battery, the presence or absence of DC loads in parallel with the battery and charger, and differing ratios of battery capacity to charger output all affect how long the battery charger should remain in boost mode.

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Conclusion:

EverExceed has vast experience when it comes to battery solutions, and we are satisfying our partners' and customers’ pain points with the most efficient and precise state of art rechargeable batteries consistently. If you have any requirements or any kind of query regarding the battery & energy solutions, feel free to communicate with our dedicated team at any time at marketing@everexceed.com