Hi im only new to this arduino thing i do have some knowledge on computers and with electrical.
im just wanting some advice on the components i would need and how i would connect like if i have a power lead running from the mains to a stepdown module can this work or would i need something else before that, i also dont have the original power supply hence why im asking the question about power lead from mains to step down module.
NEVER connect mains power directly to a project, always use a proper power supply. Typical stepdown modules as you can find on Amazon or e-bay will anyway go up in smoke if you would try this (and cause death and destruction in the process). Mains power if misused is very dangerous.
Power supplies are really easy to get - there may be some in your spare parts drawer, your local thrift store may have some, your local supermarket definitely has them: any USB or old style mobile phone charger that produces 5V regulated power (see the markings on the device; check with your multimeter to confirm both voltage and polarity) is an excellent choice for powering an Arduino project. Connect to either the USB socket or the 5V pin, not the Vin which needs 7V or more.
Other than that, if you can find a 7-12V DC (not AC) power supply you can use that. Connect to the Vin instead. Again those are generally quite easy to find, as there are so many devices that have an external power supply.
You need at least some 58, 60 volt. What ampere hours is the battery?
I don't think charging lead-acid batteries is as critical or dangerous as charging the more-modern batteries.
I think you just "pump" current into it by applying more voltage than the current charge-state voltage.
So you need slightly-more than the battery's rated voltage available, and then you need to control/limit the current (so you don't burn-up the charger. (The voltage will "fall into place" for whatever it needs for that current at the moment.)
Do some research on lead-acid batteries and on how to build a constant-current switchmode (1) power supply, or you can make a "normal" switchmode power supply with current limiting. Constant current power supplies are commonly used for LEDs, but 1000W is "unusual" for an LED supply.
1000W is a LOT and it WILL generate as much heat as a 1000W toaster or hair drier. It might be too much for the battery. You'll probably have to "slow down" the charge by feeding-in less energy.
In case you don't know this, power (wattage) as calculated as Voltage x Current so at 48V, 1000W is about 21 Amps.
You don't really need an Arduino (or any programming) for a charger, but it could be useful if you want to monitor and display the voltage & current, or if you want to build some more advanced logic into it.
(1) Switchmode power supplies are the most efficient and the most practical & economical way to get high-power. But they are not easy to build. 
Measure the ACTUAL voltage of your battery! You need a charger that produces a voltage higher than the battery.
well i have a lithium battery charger of 36v for another scooter
Model szYB-100w-42V2A
input 100-200VAC ~50/60Hz
output 42VDC 2A
am i able to connect this to mains ten the other end to the step up module to get it to 48v or it wouldnt work and also this charger is lithium battery charger so can i use on lead-acid
Still waiting for you to tell us the actual voltage you measured on the 48 volt battery.
Do not do that, battery chemistry is very important and swapping or using the wrong charger as you are suggesting can destroy the battery and/or charger. The worst is the charger will get damaged then when charging the LI it will overcharge and give you a brilliant red fire ball.
I am assuming this is for your computer (laptop). Look where it plugs in and it will tell you what voltage and current is required. The smartest thing is to get the correct replacement. If this is the start of many projects see if you can get a small Lab Power supply with adjustable current and voltage. You can also resort to wall warts (plug supplies) or if desperate batteries.
Without experience or somebody with experience working the mains will help somebody collect on your life insurance.
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.