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Umm... I think you are talking about LFP batteries. I'd like to go with LFP if possible. But I am not sure if I can get 24/45Ah with reasonable price. If not available, I will have to go with SLA batteries, which has less charging rate.

For homes with single phase, we can draw from 2kW to around 7kW depending on the place and time of the day. But input voltage is not stable and drops quite a lot (even by 50% at peak hours).

I see. Just need 12A charger for 24Ah (24A charger for 45Ah)?

Umm...some students say they only get electricity 2/3 hours a day. In this case, they may need solar as well. Currently, I am thinking - DC Boost Converter + 24Ah/45Ah battery with charger or - DC Boost Converter + 24Ah/45Ah battery with PWM (cheaper) + Solar panel (around 100/150w) >>>...

I get your point. I came here first having a solar panel and an old UPS in mind. I will look around other forums as well.

The one I currently have is similar to this...

Again, I really appreciate all your help. Yes, we are from Myanmar (Burma). Actually I teach programming via Zoom and most of my students are from various regions where electricity outages happens so badly (much worse than big cities like Mandalay, Yangon, Naypyidaw etc). Student can't even...

Agree. I better start without solar. That's why I started experimenting with DC booster. Regarding the power bank option, power banks for laptops are available here, but they are only around 20000/30000 mAh and they are not cheap. I guess we would need 2 or 3 of them to get around 6 hours...

I will try to provide more info for the most common case. As I have added above, I am trying to figure out the most affordable option for running laptop long hours without utility power.

Currently, I used a cheap adjustable booster, not the one properly made to be used as a laptop charger. It works well if I removed the built-in laptop battery. I think the booster has problem when the laptop do some sensing the power source to start charging. It fails the test and the laptop...

Thanks, I'll check what AIOs are. I am not aware of that. Did you mean something like portable solar power station? They are available in our country. But they are a little expensive and most people can't afford them.

I've tried and tested another possible option. I used just a 12V battery together with DC to DC boost converter (12V to 19V) and I can run my laptop playing YouTube via WiFi for 4 hours. The laptop built-in battery has been removed during the testing. The downside of this option is that I need...

Thanks for all your replies! I think I should add the reason why I asked the above question. We are from a developing country in south east Asia. We get electricity only a few hours each day in winter and summer because hydroelectric power is not produced much at that time. This is a major...

I've an old UPS for my computer which draws 50 W on average and less than 150 W at full load. With the the built-in battery I only have about 10 minutes of backup time. I am thinking about getting a solar panel (around 150/200 W) together with a MPPT/PWM controller (around 10/20 A) so that I...