Maybe experiment with something like this from ebay. Read the description, looks like it may work for your use.
Dave
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On 4/19/2025 4:08 PM, Luke Vogel via groups.io wrote:
Hi all,
I have a Lenovo laptop that currently uses an AC power supply (135W).? I think the output is aprox 20V.
I'd like to be able to run it from the RV batteries (typically 12 to 13V) without the need for an inverter.
I think the major issue is the current draw.? 135W at 20V can draw 6.75A so a 12V boost converter would probably draw 11.25+ Amps.
Any thoughts on how best to achieve this?
Luke
