AC Output Mainboard

[Wolf585]

Hello I've seen and own one of the large capacity battery banks with the ac output, and was wanting to know if anyone knew what type of board was in there. I have plenty of 18650 batteries and would like to put them together (forgot the term) to be able to have something to charge my laptop besides that one.

Here's a couple of links to what I was looking for:

https://www.amazon.com/NEXGADGET-Powerhouse-42000mAh-Lithium-ion-Emergency/dp/B071D2N7TS/ref=sr_1_2?ie=UTF8&qid=1499128468&sr=8-2&keywords=ac+output+power+bank

One I own:

https://www.amazon.com/NexGadget-Patented-Multi-Function-Notebooks-Smartphones/dp/B01HEVEDTG/ref=sr_1_5?ie=UTF8&qid=1499128468&sr=8-5&keywords=ac+output+power+bank

[dany_boy]

what do you mean what type of board? Are you referring to the inverter topology? Most likely a modified square wave: push pull topology with mosfets.

[Wolf585]

im assuming the modified square wave 

[Wolf585]

Actually I'm a complete newbie to electrical engineering. What do you think?

[W-L]

2 hours ago, Wolf585 said:

Hello I've seen and own one of the large capacity battery banks with the ac output, and was wanting to know if anyone knew what type of board was in there. I have plenty of 18650 batteries and would like to put them together (forgot the term) to be able to have something to charge my laptop besides that one.

Here's a couple of links to what I was looking for:

https://www.amazon.com/NEXGADGET-Powerhouse-42000mAh-Lithium-ion-Emergency/dp/B071D2N7TS/ref=sr_1_2?ie=UTF8&qid=1499128468&sr=8-2&keywords=ac+output+power+bank

One I own:

https://www.amazon.com/NexGadget-Patented-Multi-Function-Notebooks-Smartphones/dp/B01HEVEDTG/ref=sr_1_5?ie=UTF8&qid=1499128468&sr=8-5&keywords=ac+output+power+bank

Why do from DC to AC and back to DC for the laptop, you would be much more efficient going direct from DC to DC with a large battery bank with the correct input voltage to the laptop. 

[Wolf585]

Since I have 8 18650 batteries, would I be able to use a booster to raise the output voltage?

[W-L]

2 hours ago, Wolf585 said:

Since I have 8 18650 batteries, would I be able to use a booster to raise the output voltage?

Yes it depends on how your wire them up in parallel and series but you can get it so that you boost the voltage to the required amount for the laptop. Do remember though you will need to have a balance circuity for the cells to ensure one doesn't discharge more than the others.