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- Newsgroups: comp.sys.laptops
- Path: sparky!uunet!spool.mu.edu!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!silver.ucs.indiana.edu!wilkr
- From: wilkr@silver.ucs.indiana.edu (richard wilk)
- Subject: Ideas & Help needed: Running Laptop from Car Battery
- Message-ID: <C17yvt.9Ft@usenet.ucs.indiana.edu>
- Summary: How can this be done???
- Sender: Richard Wilk (wilkr@iubacs, wilkr@ucs.indiana.edu)
- Nntp-Posting-Host: silver.ucs.indiana.edu
- Organization: Indiana University
- Date: Thu, 21 Jan 1993 19:45:28 GMT
- Lines: 53
-
- I need some feedback, advice and tech help on the following problem.
-
- I will be spending the summer living in a tent in Central America,
- miles from the nearest power line. I will be spending most of my time
- writing on my no-name clone 386SX laptop. This uses a fairly standard
- 12V nicad battery, and generally gives me about 1.25 hours.
-
- I have located a couple of photo-volataic trickle-chargers which will
- take about 8 hours to charge my battery (the cheapest one I have found
- is from a company in Ann Arbor, at 313 453-6746 if you are interested).
- But this will only give me an hour of writing a day.
-
- We have the money to buy a 4000 watt coleman generator (best price
- so far about $425), but not enough money to run it more than 2-3
- hours a night (and who wants the noise anyway). We may have enough also
- for a small PV array, but I don't know how large or what wattage.
-
- I am presently thinking about buying a car battery down there,
- a battery charger, and an inverter. Then I would charge the car battery
- every night, and run the computer off it through the inverter the
- next day. Damark has a 100 watt inverter for sale right now for
- c. $70.
-
- Questions: Will this work? Has anyone tried something similar?
-
- Sub-questions: How long do I have to run the generator to get the
- battery charged?
-
- How big a PV array would I need to replace the generator completely? (we
- will be running a few lights and radios in the evenings too)
-
- How many hours of use can I expect to get out of a car battery if
- the computer is drawing about 45 watts (I *think* that is what
- the manual says).
-
- Does it make any sense at all to be going from 110 volts AC (battery
- charger) to 12 Volts DC (battery) to 110 volts AC (inverter, computer
- power supply) to 12 Volts DC (computer power jack)????? Is there
- any way to feed the computer, safely, straight from the car battery??
-
- I would appreciate hearing from anyone with experience, ideas or
- knowledge (there must be someone with all three).
-
- Thanks very much
-
- Rick Wilk
-
-
- --
- Richard Wilk Anthropology Dept.
- wilkr@iubacs Indiana University
- voice 812-855-8162 Bloomington, IN 47405
- "Things are more like they are now than they've ever been before."
-