this post was submitted on 10 Mar 2025
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[–] [email protected] 4 points 18 hours ago (2 children)

I'm trying to figure this out at the moment.

What is the best way to power a laptop in an off-grid setup? Mine will be primarily solar + AGM battery.

I think the simplest "just works" set up is to get a "pure sine" inverter and go:

solar > battery > inverter > power supp > laptop

The thing is, if I understand correctly you have a big inefficient inverter to AC only to transform back to DC, with the only benefit being that the plug fits in the socket.

I'm curious to know how a generator ruins a power supply? Is it something to do with the arcane sine wave magic from the inverter?

[–] [email protected] 1 points 6 hours ago* (last edited 6 hours ago)

There should be options avoiding AC depending on your scenario. Most laptops charge off of DC. Easiest way would be if all your things support USBC or similar.

[–] [email protected] 5 points 17 hours ago (1 children)

The "best" would be some kind of DC to DC converter, but I'm not sure there's anything plug and play atm because there's a wide range of specs laptops want. If your laptop happens to change with USB c PD or whatever the spec is that'd be the most efficient that I'm aware of. No sense in going dc->ac->dc if it can be helped.

[–] [email protected] 1 points 8 hours ago* (last edited 8 hours ago)

The “best” would be some kind of DC to DC converter

No sense in going dc->ac->dc if it can be helped.

Most laptop chargers can actually run on DC, and with as little as 48 volts. Here is a german guy demonstrating it. So if your battery bank runs on 48 volts, I think you might be able to just connect it directly to the input of a laptop charger and it will work.