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SF3 Charging from 24v DC


New Member
I am using my SF3 on a boat and want to charge from 24v DC. I can get a DC-DC 5A converter and adjust the output to 15v DC and adapt a standard 5A USB C cable to connect to SF3. Basically chopping off the USB A plug and connecting the + and - wires to the converter output.
Will this work??


New Member
I’ve been charging with a Lidl Silvercrest Qualcomm QC 3.0 car charger on a boat. It is plugged into a 24v car type socket. (Red outlet 3.6-6.5V @3A, 6.5-9V @2A, 9-12v @1.5A and White outlet 5V 2.4A)
Then USB A lead with Ailun micro A to USB C converter tip. Plugged into the laptop and it doesn’t work.
So I plug into a USB C hub that supports 100w power delivery:
And it charges well. I have a USB in line power meter, A, V, mah and it shows charging at 5.2V and 1.96A. Just about 10W. So 0-100% in about 5 hours, which is fine.
When at 100%, the A drops to 0.06. Shame the SL3 doesn’t have a simple red/orange/green charging LED. It is crazy to switch on laptop just to check state of charge!!
With further thought, these batteries last best when kept between 20 – 80%.
So a red/orange/green laptop LED that can be configured in power settings to change. Say Red at 20% and Green at 80%, would be brilliant.

I prefer USB C charging to the mains charger. It is much better to slow charge for longer battery life. Just as with an electric car – slow overnight is way better than a rapid charger.

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