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Batterypack for speakersystem!
#21
Pretty much all chargers that say "48V charger" will go above that. Most of them are based off of lead acid. LA's have a top voltage of about 14.1V. So, a 48V charger will be 14.1 * 4 = 56.4V

Even if the charger bases it's top voltage off of 13.5V, that's still 54V.

That is, unless you are using a "power supply" that is rated at 48V. Then that's what it will want to charge to, and not go over.
So yeah, a power supply won't go above the 48V. The reason you should have a "charger", not a powersupply if you want max capacity available to you.

You can use an LA charger. Just note that it won't switch from CC to CV the same way LiIon's like to be switched over. So you won't get the full amount of charge.

But, you could make it so that the power supply's top voltage, say 48V, is the top voltage of the string. So, if you go with 12s, you'll charge to 4.0V. But, again, you aren't getting that nice transition from CC to CV to finish the charge.

*a bit tired, so I hope I explained that clearly. been a long day*
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#22
(09-17-2018, 11:33 PM)Korishan Wrote: Pretty much all chargers that say "48V charger" will go above that. Most of them are based off of lead acid. LA's have a top voltage of about 14.1V. So, a 48V charger will be 14.1 * 4 = 56.4V

Even if the charger bases it's top voltage off of 13.5V, that's still 54V.

That is, unless you are using a "power supply" that is rated at 48V. Then that's what it will want to charge to, and not go over.
So yeah, a power supply won't go above the 48V. The reason you should have a "charger", not a powersupply if you want max capacity available to you.

You can use an LA charger. Just note that it won't switch from CC to CV the same way LiIon's like to be switched over. So you won't get the full amount of charge.

But, you could make it so that the power supply's top voltage, say 48V, is the top voltage of the string. So, if you go with 12s, you'll charge to 4.0V.  But, again, you aren't getting that nice transition from CC to CV to finish the charge.

*a bit tired, so I hope I explained that clearly. been a long day*

So a custom-designed charger that charges to 48V would also got gain the extra capacity from the batteries, or am I wrong? Since they never achieve the maximum voltage, where they like to have constant voltage? Cause I'm sure the powersupply will deliver a constant voltage at 48V, when the battery has reached that level of charge.

Also: When I connect the powersupply rated at 5A. How does it exactly regulate and make sure that no more than 5A coming out of the powersupply.

Example: If I have a 1a 12v powersupply, I could easily start connecting too many LEDs, thus overloading the powersupply. In this case a battery has an infinite power draw until the voltage of the powersupply and battery are the same. How does it regulate the power coming out? And can I expect 5a charge current?
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#23
(09-18-2018, 09:13 AM)Grymer Wrote: So a custom-designed charger that charges to 48V would also got gain the extra capacity from the batteries, or am I wrong? Since they never achieve the maximum voltage, where they like to have constant voltage? Cause I'm sure the powersupply will deliver a constant voltage at 48V, when the battery has reached that level of charge.

Also: When I connect the powersupply rated at 5A. How does it exactly regulate and make sure that no more than 5A coming out of the powersupply.

Example: If I have a 1a 12v powersupply, I could easily start connecting too many LEDs, thus overloading the powersupply. In this case a battery has an infinite power draw until the voltage of the powersupply and battery are the same. How does it regulate the power coming out? And can I expect 5a charge current?

Powersupplies have current limiting bits in them. So when they say 5A, they usually mean that, maybe about 7A max. A good one, anyways. The issue will be when connecting a low charge battery to the powersupply. So, if the battery is at 40V, and the powersupply is connected, you'll have 8V differential @ 5A. The powersupply *may* not like this too much. That's when the amps could get overwhelming.
That's why an actual "charger" is used as it can handle the ramping up of the voltage as the charge comes up on the battery.

Another issue you have with LiIons and a basic charger/powersupply, is float charging. This is basically what you mention with "the powersupply will deliver a constant voltage at 48V, when the battery has reached that level of charge." Float charging isn't really good for LiIons and why on all the programmable chargers we recommend turning off float, or set it to the same as the cutoff/top voltage. LiIons need a little bit of cycling to keep them healthy. Not a constant flow of power, even at a trickle.
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Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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#24
(09-18-2018, 11:38 AM)Korishan Wrote:
(09-18-2018, 09:13 AM)Grymer Wrote: So a custom-designed charger that charges to 48V would also got gain the extra capacity from the batteries, or am I wrong? Since they never achieve the maximum voltage, where they like to have constant voltage? Cause I'm sure the powersupply will deliver a constant voltage at 48V, when the battery has reached that level of charge.

Also: When I connect the powersupply rated at 5A. How does it exactly regulate and make sure that no more than 5A coming out of the powersupply.

Example: If I have a 1a 12v powersupply, I could easily start connecting too many LEDs, thus overloading the powersupply. In this case a battery has an infinite power draw until the voltage of the powersupply and battery are the same. How does it regulate the power coming out? And can I expect 5a charge current?

Powersupplies have current limiting bits in them. So when they say 5A, they usually mean that, maybe about 7A max. A good one, anyways.  The issue will be when connecting a low charge battery to the powersupply. So, if the battery is at 40V, and the powersupply is connected, you'll have 8V differential @ 5A.  The powersupply *may* not like this too much. That's when the amps could get overwhelming.
That's why an actual "charger" is used as it can handle the ramping up of the voltage as the charge comes up on the battery.

Another issue you have with LiIons and a basic charger/powersupply, is float charging. This is basically what you mention with "the powersupply will deliver a constant voltage at 48V, when the battery has reached that level of charge."  Float charging isn't really good for LiIons and why on all the programmable chargers we recommend turning off float, or set it to the same as the cutoff/top voltage. LiIons need a little bit of cycling to keep them healthy. Not a constant flow of power, even at a trickle.

I will be going for a 11s pack and then use a 11s charger. I might not get all 600w avaliable from the amp, but atleast everything else is running smooth and components are made for eachother! And the amp will still deliver a fair bit of power!
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