Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.


So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

73

Uwe

On Tue, 24 Feb 2004 02:05:39 GMT, U wrote:

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.

So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

There is a magazine called "Home Power" which deals with all sorts of
home power generation and storage issues, and enabling technology.

See the articles as well as the advertisements.

Online: http://www.homepower.com/

Happy trails,
Gary (net.yogi.bear)
------------------------------------------------
at the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom

On Tue, 24 Feb 2004 02:05:39 GMT, U wrote:

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.

So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

There is a magazine called "Home Power" which deals with all sorts of
home power generation and storage issues, and enabling technology.

See the articles as well as the advertisements.

Online: http://www.homepower.com/

Happy trails,
Gary (net.yogi.bear)
------------------------------------------------
at the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom

In article ,
U wrote:

So which chargers can I leave permanently attached to a battery?

What you want is something called a "float charger". It provides a
carefully-regulated charging voltage (typically in the 13.5 - 13.8
volt range), with a current limiter.

The word 'trickle charger' or 'shore power' comes to mind.

A trickle charger may, or may not regulate the charging voltage
carefully enough to allow it to be hooked up on a semi-permanent basis.

If the voltage is too low, the battery may not maintain a good charge
state, and may not recharge if you run it down partway.

If the voltage is too high, the battery will begin "gassing" - the
high voltage breaks down the water in the electrolyte into hydrogen
and oxygen gasses. If you don't replace the lost water (using
distilled or demineralized water) periodically, the electrolyte level
will fall below the top of the plates, and you'll lose charge capacity
and may very well damage the battery permanently.

How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

Standard battery chargers are often of a dual-voltage variety. They
fast-charge the battery at a high voltage (around 14.4 volts) until
it's mostly charged, and then switch to a lower trickle-charge voltage
(13.8 or so) to finish the charging without excessive loss of
electrolyte.

Unless they're designed for long-term float charging use (careful
voltage regulation, with some amount of temperature-based adjustment
of the float voltage), leaving a charger of this sort hooked up on a
long-term basis can still result in some loss of electrolyte.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

In article ,
U wrote:

So which chargers can I leave permanently attached to a battery?

What you want is something called a "float charger". It provides a
carefully-regulated charging voltage (typically in the 13.5 - 13.8
volt range), with a current limiter.

The word 'trickle charger' or 'shore power' comes to mind.

A trickle charger may, or may not regulate the charging voltage
carefully enough to allow it to be hooked up on a semi-permanent basis.

If the voltage is too low, the battery may not maintain a good charge
state, and may not recharge if you run it down partway.

If the voltage is too high, the battery will begin "gassing" - the
high voltage breaks down the water in the electrolyte into hydrogen
and oxygen gasses. If you don't replace the lost water (using
distilled or demineralized water) periodically, the electrolyte level
will fall below the top of the plates, and you'll lose charge capacity
and may very well damage the battery permanently.

How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

Standard battery chargers are often of a dual-voltage variety. They
fast-charge the battery at a high voltage (around 14.4 volts) until
it's mostly charged, and then switch to a lower trickle-charge voltage
(13.8 or so) to finish the charging without excessive loss of
electrolyte.

Unless they're designed for long-term float charging use (careful
voltage regulation, with some amount of temperature-based adjustment
of the float voltage), leaving a charger of this sort hooked up on a
long-term basis can still result in some loss of electrolyte.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with
a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.


So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).
=======================
Don't know how much power is involved and the average duration of an outage
, but the simplest way to keep power during brownouts is to use a
UPS=Uninterruptable Power Supply with integral batteries . I am using a make
APC=American Power Corporation , model Back-ups Pro 650 (650 Volt * Amp or
650 VA ,which equals 650 Watts when power factor =1) Back -up time at full
load is approx 15 minutes. UPSes are also available for connection to
external batteries .

Frank GM0CSZ / KN6WH

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with
a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.


So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).
=======================
Don't know how much power is involved and the average duration of an outage
, but the simplest way to keep power during brownouts is to use a
UPS=Uninterruptable Power Supply with integral batteries . I am using a make
APC=American Power Corporation , model Back-ups Pro 650 (650 Volt * Amp or
650 VA ,which equals 650 Watts when power factor =1) Back -up time at full
load is approx 15 minutes. UPSes are also available for connection to
external batteries .

Frank GM0CSZ / KN6WH

In article , U
writes:

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.


So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

With good control of charging current and voltage, the battery can
"float" in the circuit, always connected to the charger or the AC mains
low voltage supply that can take over from the battery when mains are
hot. The space folks do that regularly from low earth orbit (90 min.) to
geo-synchronous (24 hours), using series power diode isolation.

Another thought is to check out computer UPSs which have already
been engineered and tested, ready to go off the shelf. Those can
handle up to 600 W loads for small servers and auto-switch to internal
batter in less than an AC cycle. Industrial-strength UPS models can
handle much more. A little, cheap UPS sits between my PC box and
line all the time now, can easily handle 300 W loads for several minutes.

Len Anderson
retired (from regular hours) electronic engineer person

In article , U
writes:

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.


So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

With good control of charging current and voltage, the battery can
"float" in the circuit, always connected to the charger or the AC mains
low voltage supply that can take over from the battery when mains are
hot. The space folks do that regularly from low earth orbit (90 min.) to
geo-synchronous (24 hours), using series power diode isolation.

Another thought is to check out computer UPSs which have already
been engineered and tested, ready to go off the shelf. Those can
handle up to 600 W loads for small servers and auto-switch to internal
batter in less than an AC cycle. Industrial-strength UPS models can
handle much more. A little, cheap UPS sits between my PC box and
line all the time now, can easily handle 300 W loads for several minutes.

Len Anderson
retired (from regular hours) electronic engineer person

in article , Avery Fineman at
wrote on 2/25/04 20:57:

In article , U
writes:

Where I live, in the woods of Maine, we have power outages.

Solar panels and all that stuff is quite expensive, but old car batteries
("old" is when it doesn't get my Diesel started in subzero temps) are not.

To make things just a bit comfi it would be nice to leave it in place with a
charger attached (right now I tote the charger around when needed).

Many things will run right off the batterie(s), others might need an
inverter.

So basically I am talking about a photovoltaic system without the
photovoltaic panels, sort off.


So which chargers can I leave permanently attached to a battery?

The word 'trickle charger' or 'shore power' comes to mind. How is that
different from my old Sears charger which does me good for many years
already (but I unhook it after a day at most!).

With good control of charging current and voltage, the battery can
"float" in the circuit, always connected to the charger or the AC mains
low voltage supply that can take over from the battery when mains are
hot. The space folks do that regularly from low earth orbit (90 min.) to
geo-synchronous (24 hours), using series power diode isolation.

Another thought is to check out computer UPSs which have already
been engineered and tested, ready to go off the shelf. Those can
handle up to 600 W loads for small servers and auto-switch to internal
batter in less than an AC cycle. Industrial-strength UPS models can
handle much more. A little, cheap UPS sits between my PC box and
line all the time now, can easily handle 300 W loads for several minutes.

Len Anderson
retired (from regular hours) electronic engineer person

Len,

You are right about the UPS, but the car batteries are already here as is
enough stuff to probably build a suitable charging supply with.

There is one thing which should not stop around here, I just found that out
the hard way, and that is the water pump for my hot water solar collectors
(she blows like a whale!).
But once I buy that rather expensive DC circulator pump (only 1.5 amps)
everything can run off that old battery.

I guess the only thing left to do is to find a little circuit which provides
that good control you mention so that that battery can really be left on the
charger for good (I hear people commenting that some charging circuits do
get confused when they are hooked up to a battery which in turn is providing
power to a load but I don't understand why that is).

regards Uwe