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fuel consumption of diesels?

But one would be tempted to never fully charge the batteries,

Means you do not get full use of the capital invested in the battery.

because for
the last 24 hours, the generator would be running at essentially no load.

Not necessarily the genset could be doing other work and then the
battery charge power is that at the marginal cost of the extra power,
indeed it could put the genset nearer its optimum.

AJH
 
Hard to say. In my case, I want power 24 hours a day, as is typical for a
residence. It doesn't make sense to run a genset to power a TV, a bunch of
lights, a small sump pump, a couple of friges, a microwave, and a hot-water
heating system.

I agree to some degree and realise there are many ways to skin a cat,
I have a suspicion that 8hrs running is sufficient for many homes with
a bit of planning, especially when it comes to fridges, freezers and
washing machines. I have nothing against inverters and battery, it's
just I lean toward running the generator and restricting battery use
for higher value electrical requirements like IT and lights.
In a residence, the loads vary wildly. In a business, they may still vary,
but with a higher degree of utilization, and limited to an 8 hour workday.
Is that the case with your app?

It's only a business in the sense it is a remote teaching facility.
The staff will make no concessions to conserving power as they are
well paid individuals from a very affluent, well serviced, area.
<snipped details of battery plus charging arrangement>

I'll try to settle down and look at this, I am afraid battery inverter
systems are not in my experience.

In principle I see little difference in what you propose later than
what the honda inverter sets do, you just have a battery in between.
My judgement leads me to suggest going for a smaller battery.

AJH
 
R

Robert Morein

Jan 1, 1970
0
Means you do not get full use of the capital invested in the battery.



Not necessarily the genset could be doing other work and then the
battery charge power is that at the marginal cost of the extra power,
indeed it could put the genset nearer its optimum.

AJH

True. I'm just having trouble finding a use for the extra power.
If I use the extra power, I have to supply extra fuel.
But it's worth considering.
 
S

Steve Spence

Jan 1, 1970
0
My 1200 rpm diesel generator is reported to consume 1 gallon per hour at
full load, 15 kWh. I won't be running at this capacity, so I have been told
consumption will be around 1/2 gallon / hour. I will keep track of actual
consumption and report back.

http://www.green-trust.org
 
Newsgroups: alt.energy.homepower

The charging rate would be higher, of course.
But one would be tempted to never fully charge the batteries,
because for the last 24 hours, the generator would be running at
essentially no load. There is nothing wrong about this from the
energy standpoint, but it would quickly ruin the batteries.
The dilemma is, do we ruin the generator, or do we ruin the
batteries.
Would you consider using PV to finish the charge? It's what I do on the
occasional partly-sunny day here.


Tom Willmon
near Mountainair, (mid) N.M., USA

Net-Tamer V 1.12.0 - Registered
 
R

Robert Morein

Jan 1, 1970
0
Would you consider using PV to finish the charge? It's what I do on the
occasional partly-sunny day here.
I actually have four panels, but the property has obstructive trees. I can't
set them up in a fixed position; I'd have to walk them around the property.
I agree that's the ideal way to do it.
 
W

William P.N. Smith

Jan 1, 1970
0
There is nothing wrong about this from the energy standpoint, but it would
quickly ruin the batteries.

Why do you think this is true? Fully discharged batteries can get
sulfated, but 90% charged batteries?
 
R

Robert Morein

Jan 1, 1970
0
Why do you think this is true? Fully discharged batteries can get
sulfated, but 90% charged batteries?
All lead acid batteries sulphate whenever there is no current going into
them.
Heavily discharged batteries sulphate more rapidly.
However, there is no threshold charge state above which sulphation stops.
The only thing that stops it is float current.
Depending upon the cost of the battery, this is frequently acceptable.
A $150 Concorde AGM is priced and intended for less than ideal condition,
and you can get 4 to 7 years out of it.
The Hawker AGMs have a 20 year design lifetime, but it is necessary to keep
them constantly on float, or sulphation will prevent the battery from
reaching the design lifetime.
 
S

Steve Spence

Jan 1, 1970
0
I will only be pulling 7kw or less most times. This is replacing a 5kw unit
that isn't big enough to handle simultaneous big loads.

even at 1.6 gph, fuel consumption isn't an issue when the fuel is free.
 
W

William P.N. Smith

Jan 1, 1970
0
Robert Morein said:
All lead acid batteries sulphate whenever there is no current going into
them.

Do you have a cite for this?
 
D

daestrom

Jan 1, 1970
0
Do you have a cite for this?

Don't know exactly what Robert is thinking, but it is true that all
lead-acid batteries will self-discharge. And if allowed to the extreme,
could completely discharge a battery. And of course a battery left
discharged is subject to sulphating.

But self-discharge is not normally a problem unless you plan on leaving them
unused for long periods of time (e.g. a month or more).

daestrom
 
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