Li-ion charger modification. More amps is possible?

Batteries, Chargers, and Battery Management Systems.
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vicens   100 W

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Li-ion charger modification. More amps is possible?

Post by vicens » Dec 21 2015 4:11pm

I have seen on the transformer that says: EE42-60V-12A

The charger is set to 5A / 9.6A. It can be changed with the switch.

Is it possible to adjust to 12A?
Is it possible to adjust to 14A?

You can adjust the amperage potentiometer.
I've put 10 seconds to 12 Amps. and it worked well.

The charger has no fuse in the battery connection. Is it advisable to put a fuse?

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Nobuo   10 kW

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Re: Li-ion charger modification. More amps is possible?

Post by Nobuo » Dec 22 2015 4:17am

Ahead current capabilities in general it is a battle against heat. The transformer should hold up to 120ºC during operation, the capacitors are marked as 105ºC, these two are the ones that generate more heat and more likely to fail.

Should be limited to 12A, do you really get 14A?

Once running, the most important thing is that during CC operational phase, you avoid to disconnect suddenly the charger battery or capacitors will burst. Switch off, or disconnect it from the 240VAC socket first.

By the way, if the fuse it is shown in the picture are rated over 4A, it won't mechanically protect an overcurrent
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vicens   100 W

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Re: Li-ion charger modification. More amps is possible?

Post by vicens » Dec 22 2015 6:12am

I am using this charger in the charging of electric vehicles. In the charging am shortly time. I want the load to be fast. To charge more amount.

This charger is marked up as 73.14. By buying work on 73V charger. I've changed to 67.5V. It may be that the 15 amp model is the same. adjust the amperage near 10.

Looking at this charger. The setting is above the limit of maximum power.

http://www.avdweb.nl/solar-bike/electro ... -800g.html

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dogman dan   100 GW

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Re: Li-ion charger modification. More amps is possible?

Post by dogman dan » Dec 22 2015 7:32am

Chances are good, that adjusting the charger too high amps will shorten it's lifespan. I'd stick to no more than about 6 amps with that one, and buy a larger charger to charge faster.

IF,,, your battery can handle faster. Many bike size battery bms max out at 5-8 amps.

vicens   100 W

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Re: Li-ion charger modification. More amps is possible?

Post by vicens » Dec 24 2015 7:41am

Nobuo wrote:Ahead current capabilities in general it is a battle against heat. The transformer should hold up to 120ºC during operation, the capacitors are marked as 105ºC, these two are the ones that generate more heat and more likely to fail.

Should be limited to 12A, do you really get 14A?

Once running, the most important thing is that during CC operational phase, you avoid to disconnect suddenly the charger battery or capacitors will burst. Switch off, or disconnect it from the 240VAC socket first.

By the way, if the fuse it is shown in the picture are rated over 4A, it won't mechanically protect an overcurrent
The fuse is 6 amps.

How do you do the calculation of the size of the fuse?

I some tests.

The output set 12A. Transformer temperature after one hour was 40 ° C. The atmosphere of 16 ° C.

The plug wattmeter gives values. 840 / 910W 227 / 232V 5.8 / 6.1A. 64 pi coefficient.

I do not understand the results.

Later proved to climb more aperios. Arriving at 14.2A. Amps up and down. a security system is limiting.

I left it to 12 amps.

vicens   100 W

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Re: Li-ion charger modification. More amps is possible?

Post by vicens » Dec 24 2015 8:35am

dogman dan wrote:Chances are good, that adjusting the charger too high amps will shorten it's lifespan. I'd stick to no more than about 6 amps with that one, and buy a larger charger to charge faster.

IF,,, your battery can handle faster. Many bike size battery bms max out at 5-8 amps.
For a larger charger.

I would like charger 1200w or 1500w. To charging a maximum of 67.5V 22A. If the charger can.

But size may be too large. measures have to look.

The price may be very expensive.

What charger 1200 / 1500w recommend me?

¿I can connect two chargers with output in parallel?

BMS supports up to 80A charging.

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dogman dan   100 GW

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Re: Li-ion charger modification. More amps is possible?

Post by dogman dan » Dec 24 2015 9:17am

I wouldn't know which is the good one, in the larger chargers.

I missed that the charger is supposed to put out up to 9.5 amps. Likely it will run cool enough all winter at a higher rate, but come summer, consider turning it back down to about 10 amps.

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