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Hi All,
The literature says a 12.8V 300aH LFP smart can take up to 600A but the recommened charge current is less than or equal to 150A. If I were to use a 12KV generator to charge would it be unsafe to regularly charge above the 150A recommened?
Thanks
recommended charge current gives longer lifetime than max charge current.
The expected cycle life numbers will need to be derated if you go above the recommended charge current on a regular basis.
Kai's answer is accurate, just to expand on what has been stated however, to specifically answer your question a rapid charge in 1/2 hour (2C Charge current, or 600A in your case) should not be "unsafe" for a LFP battery. It will simply reduce the life-span of your battery vs 0.5C current (2 hour to full charge) as Kai stated.
LFP batteries have a pretty crazy long lifespan already, but unless there is a critical need to reduce charging time down from 2 hours, which is pretty fast already, I would advise against "regular" currents this high, or expand your battery bank.
Hi @Rom,
To add to what Kai & ee21 said, also keep in mind that the BMS records the max charge current, as well as the average max over the lifetime of the battery.
Some suppliers specify these limits in their warranty document. So if it is exceeded, it will void the warranty.
Regards,
Anita.
Hi All,
Most lithium batteries (including Victron batteries) have cells inside that can handle high currents without problems. However, the limitations are heat:
-when charging / discharging with high current (say: above 0,5C), there is more heat created than the plastic housing can give off to the surrounding, thus limiting the continuous current rating.
-There can also be limits in internal connections, and when a BMS with internal disconnection is involved, this can also be a limit.
Most systems don't need batteries with high (dis-)charge rates, so most batteries aren't made for this (already 0,5C rates are much much higher than lead-acid batteries can take, 0,1-0,2C)
When a system needs a battery with high (dis-)charge rates, there are batteries available that can handle this, like the HE-batteries, they have an internal fan to cool the battery cells when necessary:
https://www.victronenergy.com/batteries/lithium-battery-24v-180ah
