Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[SOLVED] Help understanding solar battery use

Status
Not open for further replies.

d123

Advanced Member level 5
Joined
Jun 7, 2015
Messages
2,505
Helped
494
Reputation
992
Reaction score
525
Trophy points
1,393
Location
Spain
Activity points
27,148
Hi,

Battery: 12V DC, 125Ah. It says 'deep discharge' on the sticker.
DC to ~230V AC inverter: It says 1200W/2500W on the sticker. I assume 1200W is for 230V AC and 2500W for 120V AC.

Can someone please tell me battery duration with the examples below of what can be powered at 230V AC and for how many hours when the battery is fully charged?

e.g.
A laptop that uses 1.6A at 230V AC
A 600W, 230V AC vacuum cleaner
A 30W, 230V AC soldering iron: how many hours can each be powered, theoretically?

I don't trust my own guesstimates much as they must be wrong and would appreciate input from someone who knows the formulas.

Many thanks.
 

Hi,

I won't do simple + - × ÷ math for you....

Energy = power x time.

I assume you are able to calculate the energy stored in the battery by your own.
Now divide it by the load power to get the time.
Multiply the time with the expected power conversion efficiency.

A laptop that uses 1.6A at 230V AC
is no useful value, because power factor is missing.

Use the "actally drawn power" instead of the "rated power".

Example: My 50W soldering iron will draw about 25W when "active" ... and even less when it's in sleep mode (when placed in the holder).

Klaus
 
  • Like
Reactions: d123

    d123

    Points: 2
    Helpful Answer Positive Rating
Hi Klaus,

Thank you, that helps a lot.
 

A laptop drawing 1.6A at 230V AC..... That is approximately 370W !

You must have a very big lap d123, or at least a very hot one!

Brian.
 

Hi Brian,
:lol: The sticker says that and then 19.5 V DC, 3.3A; the laptop is about 18 years old... Here's a fair comparison:

download.jpeg
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top