Charging a battery with solar, while using it

Thread Starter

Michael.R

Joined Jun 28, 2019
2
Hi all, I'm a bit new to electronics but I want to make a project and need your help.

I want to power a pump using a battery.
The battery need to get recharged every time the solar panel can supply the needed current but in the same time still supply the needed power to the pump.

I suppose I need some kind of a charging regulator board for this?
Also, do I connect the Solar panel in series to the battery and the pump or there are parallel connections needed?

The specifications of all parts are:
Solar panel:
20W, 5V, 1.2A (All rated for max output, after the regulator)
Pump:
3.5-9V, 1-3W

how would you make this? and what battery would you use?
 

oz93666

Joined Sep 7, 2010
736
So the solar panel outputs 5V when delivering max power , that's about 7 V open circuit (No load) ...

You would not need a very big battery , and no regulator is needed if you have a battery protection circuit ...

The voltages for the panel and the pump don't match very well ... lithium is the best choice for battery and you may get away with 1 cell .... that's a voltage between about 4.2 and 3.6 ... the pump will be a bit under powered , but will work ...

You just need two components ... the battery ...

just one of these is enough ... get a recognised brand panasonic ..6 pounds UK it will hold 10WHrs enough to run the pump 10 hrs (at 4V) https://www.ebay.co.uk/itm/3400mAh-Rechargeable-Panasonic-NCR-18650-3400mAh-Battery-Li-ion-HIGH-DRAIN/254214704957?hash=item3b30608f3d:m:mW6lttqfQ7vbdhaCtnaVZCg

and a protection circuit ..... many different types .... very cheap

this will connect panel with battery and prevent overcharging , and the pump is connected to the battery

https://www.ebay.co.uk/itm/1S-5A-3-7V-18650-BMS-Li-ion-lithium-Lipo-Battery-Circuit-PCB-Protection-Board-XM/153290985889?hash=item23b0dad1a1:g:4sIAAOSwvmNbKJ21
 
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