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How to boost 2v - 4v, 50mA - 100mA to 5v 500mA?

BhanuShashanka

Jun 21, 2023
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I have two solar panels each containing of 2V 50mA. I want to make a phone charger or a Li-Po battery charger with these solar panels. Is there any way I can boost and get an output of 5V 500mA? Also I have purchased few components, 0.9 - 5V to USB 5V 600mA Boost Converter, TP4056 Charging Module and Power Bank Module. The USB Booster is boosting Volts, but not the mA, so the charging percentage in my phone is not increase. I have no knowledge about all these, but just a lot interest. Please help, thank you.

These are the links to the products I purchased :

USB Boost Converter
https://www.amazon.in/Robocraze-Con...efix=0.9+-+5v+to+usb+5v,computers,188&sr=1-11
TP40596 Module:
https://www.amazon.in/Electronic-Sp...omputers&sprefix=tp4056,computers,203&sr=1-12
Power Bank Module
https://www.amazon.in/Electronic-Sp...words=power+bank+module&qid=1687324300&sr=8-2
 

Harald Kapp

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Nov 17, 2011
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No way. You expect:
input: 4 V × 50 mA = 200 mW
output; 5 V × 500 mA = 2500 mW
But: output power can never be higher than input power.

The best you can achieve is 5 V @ < 40 mA using a boost converter.
 

BhanuShashanka

Jun 21, 2023
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Thank you very much. But what if I increase my Volts, will that help decrease the Volts and increase Current. For example, 10V 250mA to 5V 500mA?
 

kellys_eye

Jun 25, 2010
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If you assume 100% conversion efficiency (impossible) then 10V @ 250mA could theoretically convert to 5V @ 500mA - but it won't in the real world.
 

Harald Kapp

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For practical purposes assume 80 % efficiency. So 5 V @500 mA translates to 10 V @ 312 mA.
 

kellys_eye

Jun 25, 2010
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Will it give my required output of 5V 500mA
Possibly.......

You want (5 x 0.5 = 2.5W) and you have (12 x 0.24 = 2.88W) so only a minimal overhead (0.33W) but if the stated efficiency as 97.5% (which I would take with a pinch of salt) you will JUST get away with it.

In any design you really should have 'spare' capacity - your's is borderline so don't expect it to work the way you want it to.
 

AnalogKid

Jun 10, 2015
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I have found a buck converter online. 6-24V To 5V 3A USB Step Down Module
The product page says the conversion efficiency is 97.5%. It is not.

That is a theoretical maximum based on a specific set of input and output conditions, *none* of which is specified. It should be able to deliver 80% efficiency, but as above, 87% will be tight.

ak
 
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