ScooterMan101
1 MW
I have new / newer items that are not working properly .
A little less than a year ago I bought a iSDT T8 DC charger,
I was using a 12 volt meanwell 250 watt charger but sold it along with my first bike conversion .
So
I started using a HP power supply that I modified , but it is only 12.27 volts output 750 watts , it worked ok but not enough for charging 3 or more batteries at the same time in parallel . ( you get less than half of that 750 watts when it is feeding the charger only 12 volts . I do not know the math but someone here does )
So Then I bought meanwell ERPF-400-24 from China ( big mistake buying from China ! )
It was advertised at being able to charge up to a little over 16 amps, and since it is 24 volt it should, However it heats up and buzzes at anything over 10 amps charging, less than 10 amps and it does not buzz , but still gets very hot. I have to put a high speed fan a few inches away to keep it operating .
So
I thought I would just bypass the power supplies altogether by buying a large Marine/RV deep cycle battery and run the iSDT T8 charger off the 104 amp hour reserve 12 volt battery.
Then I found another problem , the iSDT T8 charger shuts off at an imput of 11.3 volts , good you say ?
Well
The problem is that the iSDT T8 says it only has less than 11.3 volts imput, but the Deep Cycle Battery is reading 12.6 or more volts , even for the few seconds that the iSDT T8 runs .
I even connected 2.5 amps of charging to the Deep Cycle Battery to insure there would not be a voltage drop, which there is not down to under 12.6 volts anyway as I found out by measuring it while under load.
I went to the vendor's website and found a review by someone who bought a iSDT T8 and he said his shuts off at 11.3 volts.
( I do not think he even measured his battery to see that the problem is not with the battery , the problem is with the iSDT T8.
So now I am thinking about having someone make me a battery pack from 18650's or 21700's in the form of nearly 28-32 volts , maybe even 36 volt pack since the iSDT operates at up to 40 volts input
But then then another problem comes up. I want to charge several batteries at a time. 20 amps to nearly 30 or so amps.
So Then the question is , how many round cells would I have to have put in parallel in order to get a constant charge rate of 20 - 30 amps constant for an hour or more ?
And which cells are up to the task of higher constant amp output ?
A little less than a year ago I bought a iSDT T8 DC charger,
I was using a 12 volt meanwell 250 watt charger but sold it along with my first bike conversion .
So
I started using a HP power supply that I modified , but it is only 12.27 volts output 750 watts , it worked ok but not enough for charging 3 or more batteries at the same time in parallel . ( you get less than half of that 750 watts when it is feeding the charger only 12 volts . I do not know the math but someone here does )
So Then I bought meanwell ERPF-400-24 from China ( big mistake buying from China ! )
It was advertised at being able to charge up to a little over 16 amps, and since it is 24 volt it should, However it heats up and buzzes at anything over 10 amps charging, less than 10 amps and it does not buzz , but still gets very hot. I have to put a high speed fan a few inches away to keep it operating .
So
I thought I would just bypass the power supplies altogether by buying a large Marine/RV deep cycle battery and run the iSDT T8 charger off the 104 amp hour reserve 12 volt battery.
Then I found another problem , the iSDT T8 charger shuts off at an imput of 11.3 volts , good you say ?
Well
The problem is that the iSDT T8 says it only has less than 11.3 volts imput, but the Deep Cycle Battery is reading 12.6 or more volts , even for the few seconds that the iSDT T8 runs .
I even connected 2.5 amps of charging to the Deep Cycle Battery to insure there would not be a voltage drop, which there is not down to under 12.6 volts anyway as I found out by measuring it while under load.
I went to the vendor's website and found a review by someone who bought a iSDT T8 and he said his shuts off at 11.3 volts.
( I do not think he even measured his battery to see that the problem is not with the battery , the problem is with the iSDT T8.
So now I am thinking about having someone make me a battery pack from 18650's or 21700's in the form of nearly 28-32 volts , maybe even 36 volt pack since the iSDT operates at up to 40 volts input
But then then another problem comes up. I want to charge several batteries at a time. 20 amps to nearly 30 or so amps.
So Then the question is , how many round cells would I have to have put in parallel in order to get a constant charge rate of 20 - 30 amps constant for an hour or more ?
And which cells are up to the task of higher constant amp output ?