Power Station Size

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AvatarLFA

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Hi All, hope everyone is well. Please could I ask for some assistance with regards to figuring out what size power station my girlfriend could use to keep her laptop charged for a 4.5hr load shedding period. She has a Dell G15, I have uploaded pictures of all the power specs and the info sticker on the power brick. If someone could also please explain to me how it is calculated as well as give the answer, that would be great. For an idea, we are looking at the Gizzu 296W Power Station, if it will work. Otherwise open to suggestions. TIA IMG-20230223-WA0000.jpgIMG-20230222-WA0040.jpg
 
240w power supply, damn!

240w * 4.5 = 1.2KW required assuming you're gaming.
Not sure why it has a measly 68w battery, if it chows 240w, that would mean 15min of battery life+-.


Best is to stick it on a watt meter, and see how much power it actually uses for her typical workload.
 
I'm going to guess it's only 10-20 W or so on average mostly idling with screen on.

In any case based on battery spec you should get min 4 full charges out of that Gizzu.
 
Its difficult to calculate because that laptop has such a wide power consumption range. If the GPU and CPU is working hard it will probably eat 5 times the power it would if you are just writing emails.

The easiest way is probably to see how long her 68WH battery lasts and then multiply that by how long she wants it to last to get the minimum WH battery backup.
 
B-1 said:
Its difficult to calculate because that laptop has such a wide power consumption range. If the GPU and CPU is working hard it will probably eat 5 times the power it would if you are just writing emails.

The easiest way is probably to see how long her 68WH battery lasts and then multiply that by how long she wants it to last to get the minimum WH battery backup.
Click to expand...

True but battery health also has an effect on that calc

At least that is not a lost cause as HWinfo can tell you how healthy your laptop battery is:

1677565774354.png

I have come across plenty that was over 20% wear.

For comparison, this is an AMD, and that 45Wh lasts me 8-10 hours easy. Games is another story.
 
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Tomtomtom said:
I'm going to guess it's only 10-20 W or so on average mostly idling with screen on.

In any case based on battery spec you should get min 4 full charges out of that Gizzu.
Click to expand...
I see, she is a Software Dev, so sometimes what she does can demand a lot from the laptop. But I don't think it runs at full speed too often. 4 charges sounds great though. The Gizzu has a 230V 300W AC Output. So assuming there will be no problem between the power brick and the gizzu right?
 
AlphaJohn said:
True but battery health also has an effect on that calc

At least that is not a lost cause as HWinfo can tell you how healthy your laptop battery is:

View attachment 1484017

I have come across plenty that was over 20% wear.

For comparison, this is an AMD, and that 45Wh lasts me 8-10 hours easy. Games is another story.
Click to expand...
Thank you, I will run the Cmd on her laptop and see what result it yields.
 
B-1 said:
Its difficult to calculate because that laptop has such a wide power consumption range. If the GPU and CPU is working hard it will probably eat 5 times the power it would if you are just writing emails.

The easiest way is probably to see how long her 68WH battery lasts and then multiply that by how long she wants it to last to get the minimum WH battery backup.
Click to expand...
Yeah thanks that's what I initially did. But I figured I'd ask here to make sure. The battery usually lasts about 2.5 hours from charge so would need at least 1 more charge, at most maybe 2.5. so with that logic, the Gizzu should be more than enough at 296Wh. The part that I need to confirm is will here 300W/230V AC Out on the Gizzu be sufficient to power the brick and not just get killed instantly?
 
AvatarLFA said:
Yeah thanks that's what I initially did. But I figured I'd ask here to make sure. The battery usually lasts about 2.5 hours from charge so would need at least 1 more charge, at most maybe 2.5. so with that logic, the Gizzu should be more than enough at 296Wh. The part that I need to confirm is will here 300W/230V AC Out on the Gizzu be sufficient to power the brick and not just get killed instantly?
Click to expand...
Yip, will be fine if it has a 300w ac output.
 
AvatarLFA said:
Yeah thanks that's what I initially did. But I figured I'd ask here to make sure. The battery usually lasts about 2.5 hours from charge so would need at least 1 more charge, at most maybe 2.5. so with that logic, the Gizzu should be more than enough at 296Wh. The part that I need to confirm is will here 300W/230V AC Out on the Gizzu be sufficient to power the brick and not just get killed instantly?
Click to expand...

Why do you want to convert DC to AC to convert back to DC?

I would look for something that can output straight to 19.5V DC for the laptop so you don't have conversion losses.

ieL Something like this

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Dont know if Gizzu does one as I haven't searched but someone here can help?
 
Last edited:
AlphaJohn said:
Why do you want to convert DC to AC to convert back to DC?

I would look for something that can output straight to 19.5V DC for the laptop so you don't have conversion losses.

ieL Something like this

Takealot.com: Online Shopping | SA's leading online store

South Africa's leading online store. Fast, reliable delivery to your door. Many ways to pay. Shop anything you can imagine: TVs, laptops, cellphones, kitchen appliances, toys, books, beauty & more. Shop the mobile app anytime, anywhere.
www.takealot.com www.takealot.com
www.laptopdirect.co.za

GW17500C Lalela Laptop UPS Powerbank 17500 mWh 5V 12V 19V Type-C | Laptop Direct

GW17500C Lalela Laptop UPS Powerbank 17500 mWh 5V 12V 19V Type-C for sale in South Africa. Lalela at Best Prices âś” Best Service âś” South African online shop - Buy, Rate, Review the GW17500C
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Dont know if Gizzu does one as I haven't searched but someone here can help?
Click to expand...
Dell is a bugger with that .most won't charge if connected to another supply and they also cut the speed of the CPU .the charger has a resistor inside it to turn the charge part of the laptop on .done many mods to Dell with an internal resistor on the charge port to combat that .
 
AlphaJohn said:
True but battery health also has an effect on that calc

At least that is not a lost cause as HWinfo can tell you how healthy your laptop battery is:

View attachment 1484017

I have come across plenty that was over 20% wear.

For comparison, this is an AMD, and that 45Wh lasts me 8-10 hours easy. Games is another story.
Click to expand...
Any software you know of that one can set the level of charge on the dell? Like I want to stop at 80%.
 
wingnut771 said:
Any software you know of that one can set the level of charge on the dell? Like I want to stop at 80%.
Click to expand...
Dell allows that but it won't make any difference to the software .Dell has a chip that determines cycles and will throttle the machine and tell you to replace the battery when the predetermined cycles are reached ,irrespective of battery health .
 
soulie said:
Dell allows that but it won't make any difference to the software .Dell has a chip that determines cycles and will throttle the machine and tell you to replace the battery when the predetermined cycles are reached ,irrespective of battery health .
Click to expand...
My dell doesn't not that I know of but I guess because its a couple of years old. I'm not worried about cycles, I'm worried about ageing with it sitting at 100% all the time.
 
wingnut771 said:
My dell doesn't not that I know of but I guess because its a couple of years old. I'm not worried about cycles, I'm worried about ageing with it sitting at 100% all the time.
Click to expand...
Some classify a cycle as the number of charges to reach 100% be it 5 or 10 .knowing Dell they probably count how many times you plug it in .that's why most generic batteries don't work on Dell ,the counter is in the battery pack and cannot be reset .Dell batteries aren't too expensive and they do last long .
 
soulie said:
Some classify a cycle as the number of charges to reach 100% be it 5 or 10 .knowing Dell they probably count how many times you plug it in .that's why most generic batteries don't work on Dell ,the counter is in the battery pack and cannot be reset .Dell batteries aren't too expensive and they do last long .
Click to expand...
Thanks but I don't care about cycles and is completely irrelevant to what I'm asking.
 
wingnut771 said:
Thanks but I don't care about cycles and is completely irrelevant to what I'm asking.
Click to expand...
Great stuff ,good luck in your quest for battery knowledge.maybe you can get some useless info from Google to satisfy you.
 
AvatarLFA said:
Hi All, hope everyone is well. Please could I ask for some assistance with regards to figuring out what size power station my girlfriend could use to keep her laptop charged for a 4.5hr load shedding period. She has a Dell G15, I have uploaded pictures of all the power specs and the info sticker on the power brick. If someone could also please explain to me how it is calculated as well as give the answer, that would be great. For an idea, we are looking at the Gizzu 296W Power Station, if it will work. Otherwise open to suggestions. TIA
Click to expand...
You likely looking at a smallish 12v inverter setup with lithium 100ah but you should see around 3 - 4 hours of keeping that laptop topped up and still be in use.

Once the battery is full, it's just kept in that full state and make use of the amount of power needed from the psu so it won't be the full wattage from the adaptor, running full steam all the time. So your run time would be longer.
 
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