Date: Mon, 14 Apr 1997 19:55:17 -0700
Sender: Vanagon Mailing List <vanagon@vanagon.com>
From: Ron Lussier <coyote@likeminds.com>
Subject: Beethoven's electrical system
(The following article is published at
http://www.vanagon.com/beethoven/electrical.html)
Can't get no satisfaction
-------------------------
For a little more than a year, I'd been using a wheelchair battery as
Beethoven's second battery. This is a fairly good solution... it fits under
the driver's seat, it's sealed, and it's a gel cell, so there is no
leakage. At 30 amp/hours, it's a fairly good backup power supply. I had a
inverter hooked into the battery, which allowed me to run (and charge) a
laptop computer.=20
In early 1997 I added a Propex propane heater to the van. The Propex has a
stingy 1 amp draw, but nevertheless I was worried about the small
wheelchair battery's staying power. I've been looking for a second battery
for some time that would hold more power but still fit under the driver's
seat. (With the Propex heater taking up a substantial amount of my
under-bench space, taking advantage of the under-driver space is fairly
critical.)=20
I looked at every battery catalog that I could find and searched the web,
but found nothing. Apparently, the battery compartments in the Vanagon are
designed for European-spec battery sizes, and no one makes deep-cycle
batteries in that size.=20
The battery of my dreams
------------------------
The Optima battery company recently answered my prayers when they came out
with a deep-cycle version of their battery. The Optima is already popular
with car stereo afficianados. It features a spiral-wrapped dual-plate
design, which fits more lead surface (and therefore power storage) into a
smaller space.=20
The Optima is also nearly leakproof, since the acid is held in a glass
fiber mat. The company has a demonstration where they fire a bullet into an
Optima leaving a huge hole in the center. Even with the battery's interior
exposed, there was no leakage and when placed into a vehicle, it performs
perfectly. (This may be useful on the Tierra del Fuego trip!)=20
The new "Yellow Top" deep-cycle version of the Optima battery comes in two
12 volt configurations. One has top posts, while the other has both top and
side posts. To install the battery into a Vanagon, you need to use the side
posts. This model is the Optima 750U, and it has the following
specifications:=20
Terminal type: Top & side posts
BCI group size: 34
Volts: 12v
Amp / hours: 52
Cold cranking amps:=A0=A0=A0 800 Amps
Cranking amps: 1,100 Amps
Reserve capacity: 124 minutes
Length: 9.94 inches
Width: 6.88 inches
Height: 7.81 inches
Weight: 46.1 pounds=20
Unfortunately, it's very expensive. I bought it for $180, though I expect
you may be able to find it for less on the Internet.=20
This battery will fit into the space under the driver's seat, though it's
not easy. First, the battery is too tall, so you need to grind off the top
posts so that they are level with the top of the battery. The posts are not
hollow, so this is possible. Once the posts are ground down, cover the
stubs securely with some non-conductive tape, so that they don't
accidentally short out.=20
Next, you need to remove the driver's seat entirely. When the driver's seat
is removed, you'll see that there is a metal bracket towards the front of
the under-seat compartment that interferes with installing the battery.
Knock or cut this off, as it serves no purpose other than to get into your
way. Once this bracket is removed, the battery will easily slide down into
the compartment.=20
The battery can be connected as described in the electrical section of the
FAQ. Use the side terminals, which must be positioned so that they face
forward. The battery will be flush against the back of the battery
compartment. Use a block of wood to keep the battery from sliding side to
side in the compartment.=20
Getting a charge
----------------
Another thing I wanted was to be able to plug my van into the power grid
and have my heater run right off the grid. Transformers are available that
will do this, but they're way expensive (about $500.) They're also bulky.=20
There is a 'secret socket' in the cabinet under the sink. This socket is a
standard electrical socket pair. One socket in the pair is used for running
the Westie fridge off of 120v power. The other is unused. I decided to use
this socket for a trickle-charging system.=20
I purchased an Exide 1.5amp Onboard Battery Charger (model # 7001204). It's
about 1.5 inches by 4 inches by 6 inches, and comes complete with two screw
mounting holes. It knows to shut down whenever the battery is charged, and
to power up when needed. It has an LED charging light. I bought it at
Kragen for $25. It's perfect.=20
I mounted the charger just below the shelf in the cabinet under the sink.
If you look into the cabinet, and peek under the shelf, the charger sits
just below the shelf on the left wall. (This is the wall near the fridge.)
It's mounted horizontally, and the plug sneaks up along with the propane
pipes to plug into the socket. Since it's mounted just under the shelf, it
doesn't take any significant cabinet space.=20
The charger comes with its own cable and aligator clips. I removed the
clips and wired the charger directly into the battery. The wire runs behind
the thin wood partition behind the cabinet (through a hole) and across to
the battery compartment.=20
Getting totally wired
---------------------
I've run wires to this second battery to run the Propex heater, my stereo
amplifier, and the inverter. At some point, I'd also like to hook in the
rear cabin lights, but I haven't gotten around to doing this yet. When
running line, run the thickest line possible. (8 or 10-gauge is good.) I
ran 8 gauge to the amplifier. For the Propex, I used the line which came
with the heater, which looked to be about 10-gauge.
-- /\_/\ ____
Ron 'Coyote' Lussier ( ) \ _/__ =
LikeMinds
(408) 865-0657 \ / \X / "Tools that Help People=
Decide"
coyote@likeminds.com \_/ \/ http://www.likeminds.co=
m/