Welcome to the Solar Collector
Brainstorming and Development Page!


 

Home

Hot Air Collector

Hot Water Project 1

Hot Water & Space Heating

Solar Electric

Solar Construction 101

FAQs

Best Collectors

Simply Solar
Sign up Calendar Latest Topics
 
 
 


Reply
  Author   Comment   Page 2 of 4      Prev   1   2   3   4   Next
stmbtwle

Avatar / Picture

Registered:
Posts: 2,826
Reply with quote  #11 
AGM batteries are sealed and portable, but they ARE lead, so the bigger they are the heavier (and less portable).  

Lithium batteries are available in 12v... but they're pricey. For comparison (from Amazon):
6ah Lithium: 1 pound, $108 (A 100ah auto-sized one will set you back about $1300)
7ah AGM 4 pounds, $20 

I think a spare laptop battery (or 2) would be a good option, depending on price (and you already have the charger)

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay

Rick H Parker

Avatar / Picture

Registered:
Posts: 789
Reply with quote  #12 

50000mAh (50Ah) Power Bank with a 20V/3A (200mA-4.5A) output, $110.

Full specs.


__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
lash

Registered:
Posts: 11
Reply with quote  #13 


Looks nice. So you mean this could be connected "live" between a laptop and a solar panel? Would using it "live" make the battery's health deteriorate fast?

It says 180Wh, which with a laptop taking 80W would be just over 2h, which is less than what the normal battery packs can provide (at half the price)....
lash

Registered:
Posts: 11
Reply with quote  #14 
Quote:
It says 180Wh, which with a laptop taking 80W would be just over 2h, which is less than what the normal battery packs can provide (at half the price)....


Ehh, never mind; I double checked, and a 9 cell native battery pack delivers around 94 Wh, so around half of the one you posted. So I guess the laptop only takes 80W when charging and running, then, and a lot less if not.
stmbtwle

Avatar / Picture

Registered:
Posts: 2,826
Reply with quote  #15 
Just curious what make and model is this laptop?

I have a suspicion that the laptop would run directly off a 60w or more solar panel (17v), with the internal battery as a "buffer". 
Suppose you were to contact tech help and find out what the minimum and maximum allowable voltages at the power inlet port are, and the minimum amperage required. Then we would have something to work with.

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
stmbtwle

Avatar / Picture

Registered:
Posts: 2,826
Reply with quote  #16 
"2) One use case is a trip where there might be days between each grid charging opportunity"

Would an automobile (or decent boat) be available?  

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

Avatar / Picture

Registered:
Posts: 789
Reply with quote  #17 
So I guess the laptop only takes 80W when charging and running, then, and a lot less if not.

Take your current battery run time and multiply by three. Decide if that is enough run time.  (180+94)/94 = 3.


Suppose you were to contact tech help and find out what the minimum and maximum allowable voltages at the power inlet port are, and the minimum amperage required.

Willie you already know the solution to this ... buck it. 



__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

Avatar / Picture

Registered:
Posts: 2,826
Reply with quote  #18 
Yep I thought of that.  2 12v panels in series, and an adjustable buck converter. But I'm not sure it's even necessary.
__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

Avatar / Picture

Registered:
Posts: 789
Reply with quote  #19 

So you mean this could be connected "live" between a laptop and a solar panel?

I was suggesting it as a possible solution to JJ's idea. 
If the Home charger has a DC output ... it might be possible directly off a solar panel.  With a solar panel and a Buck Converter or a Inverter ... for sure.

But I'm not sure it's even necessary.

No way to be sure without looking at the specs.

__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

Avatar / Picture

Registered:
Posts: 2,826
Reply with quote  #20 
"No way to be sure without looking at the specs."

BINGO!

You could do it with the inverter, but it'd be inefficient, and a lot of bits and pieces to tote around.  IF POSSIBLE, direct would be better.


__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics