Is a 10W solar panel enough to charge a car battery in the UK?

If you want to know the answer this video is for you.

Car batteries are pretty expensive and despite all the warranties that they last 5 years, I have never had a battery that lasts that long. Most of the times is that they are left standing for too long and the voltage drops and you can do that very few times. The optimal is if you keep the battery topped up.
The best way to do that is through a solar panel. I wanted something fairly cheap, but relatively powerful. So I bought ECO-WORTHY 10W solar panel kit. This includes the 10W monocrystalline solar panel, 10A PWM solar charge controller and crocodile cables for the car battery. The cables to the car battery are 2m long.

This test was a 2.5 months test. First leaving the battery for 20days to see how much the CCA/EN will drop and then having the solar panel with the solar charge controller facing West and then South East, each for 20 days. Every time I charged the car battery to full with a Noco Genius 5 charger. The car battery measurements were done with Foxwell BT100 Pro car battery tester. I have a review of this battery tester here:    • Car battery tester review (Foxwell BT...  

The solar panel board just added 2 5Amp fuses and a little wattage meter, so I can record how much watts the solar panel produced during a day. The wattage meter is a good unit, but when the current drops below 20mA it does not display anything and the cumulative data are not added.

The results suggest that in the UK one may need a 25W solar panel, rather than the 10W solar panel. All the testing was done in May-July in the UK, so in winter one may need a slightly larger solar panel.

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Here is everything I used for this video and my solar panel setup:

10W Eco-Worthy solar panel kit https://amzn.to/3BomzYo (Amazon UK)
25W Eco-Worthy solar panel kit https://amzn.to/3b7NH3u (Amazon UK) or ebay: https://ebay.us/eo53Vs
Foxwell BT100 Pro battery tester (amazon UK): https://amzn.to/2sflAsE or ebay: https://ebay.us/IyofKF
Noco 5 genius battery charger (amazon UK): https://amzn.to/3jzH37B or ebay: https://ebay.us/ICzn3v
5A fuses: https://amzn.to/3PIxMaO (Amazon UK) or ebay: https://ebay.us/WUKCmS
12AWG wire to extend the solar panel cables: https://amzn.to/3Q28AMc (Amazon UK) or ebay: https://ebay.us/Et7APp
Wattage meter: https://amzn.to/3vml09K (Amazon UK) or ebay: https://ebay.us/wS1TYH
4-way splitters: https://amzn.to/3OzxcuA (Amazon UK) or ebay: https://ebay.us/fDUTw3
On/Off switch: https://amzn.to/3BsTNWV (Amazon UK) or ebay: https://ebay.us/MEyNLu
Generic automotive wire to connect components: https://amzn.to/3vopVXH (Amazon UK) or ebay: https://ebay.us/boaKg2


#SolarBatteryCharger #CarBattery #SolarPanelCharger

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