How to design 20A 48V MPPT solar charger

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Chowdhury Golam Rasul

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Which algorithm should I follow to design 20A 48V MPPT solar charger design. If I want to increase ampere like 30A/40A then which portion should be changed when voltage is same 48V.
 

Re: how to design MPPT solar charge controller

For 20A,48V MPPT charger which MOSFET is suitable for DC-DC converter?
 

A popular algorithm is called 'perturb and observe'.

Change something (frequency, duty cycle, voltage), then watch to see if it increases charge rate.

If so, then leave it that way for a certain amount of time.

If not, then change it in the other direction. Observe what happens.

I have not constructed a MPPT myself. I have seen others describe a buck converter for this purpose. The reason is that a step-down function is needed more often than a boost function.

If I want to increase ampere
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This is down by stepping down voltage. Hence you increase amperes.
 

1. investigate your batteries, a nominal 48V battery (lead acid)will require 56 V at least to fully charge it.
2. This means that your solar cells must produce greater then this for maximum charge.
3. If you intend to charge at 20 A,for long life your batteries should be rated at least as 200 A/h
Frank
 

Chowdhury Golam Rasul said:
Which algorithm should I follow to design 20A 48V MPPT solar charger design. If I want to increase ampere like 30A/40A then which portion should be changed when voltage is same 48V.
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In my opinion the important think is matching the battery voltages times charge currents must be bigger than your solar panel can produce. if so you have achieved mppt.


for example you have 12 volt battery and its capacity is lets say 20Ah. so you have to charge it with 14 volt and max 2 A.
if you use a solar panel producing more than 14V x 2A= 28 watts you can not achieve max power transfer. (the important thing is current since solar panel voltage can go up by more sun light but it has a max limited current)

as i know maybe im wrong not sure but on solar panel your current is limited to a value lets say 2A. but your voltage is changing with sun light. so you should drain all the current from the panel.
 
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