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Jun 27, 2022 - 2:56:58 PM

STUD

USA

36061 posts since 3/5/2008

Dose annahone here have that systum..?
Or... know annahthin about it..?

I like the idea of battery backup systum..meself..

Jun 27, 2022 - 3:13:06 PM
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Players Union Member

banjo bill-e

Tuvalu

12359 posts since 2/22/2007

Decide if you want backup for when the grid goes down, or are you trying to lower your electric bills? That is important, because some systems are designed for one but not the other, and I believe that most Powerwall installations are for saving money and taking pressure off of the grid during peak times by shifting your usage to off-peak times. Most options offered by power companies will NOT work when the grid goes down.
I am researching smaller systems like Jackery or Goal Zero to provide a reliable but limited amount of power if the grid goes down for several days after a storm. Can't run AC but I can run fans, lights, a small DC cooler, etc.

Jun 27, 2022 - 6:34:44 PM

STUD

USA

36061 posts since 3/5/2008

I have been looking at a number of systems...
Talk about confusing...

Jun 27, 2022 - 6:49:06 PM

kww

USA

1750 posts since 6/21/2008

quote:
Originally posted by STUD

Dose annahone here have that systum..?
Or... know annahthin about it..?

I like the idea of battery backup systum..meself..


I've looked at the Power Wall, and came to the conclusion that its payoff interval was too long, especially once you factor in the cost of replacing the battery, That said, if you are remote enough that you want to protect against power outages that last for days, it's one of the few systems you can engineer to do that.

Jun 27, 2022 - 6:49:38 PM

Brian T

Canada

19319 posts since 6/5/2008

What will be your original source of power to load the batteries? Wind? Water? Solar? Grid?

I run a little solar-driven system which can deliver 500W 117VAC for about 8 hours.
I would like to have another half dozen batteries (12VDC deep cycle_) and a much bigger inverter, say 4kW. In the meantime, I bought a smart battery charger to reload the batteries from the grid at night.

Friend has a cottage in a seasonal lakeside resort. Solar panels on the roof, an uncountable number of Cat batteries (plate area determines juice storage) for enough power to run for 10 days doing average things, a month with just the fridge.

I went for the solar rig as I could not see myself outdoors in a 20 below blizzard, trying to start a generator. One big wild fire burnt so much of the transmission line that our village was dark for a month. Of course, the banks, gas stations and hospital, etc all have generators.

Even the police station had a generator. I say "had" because somebody unplugged it and walked off with it!

If I could start over, many more batteries and a bigger smart charger to load the batteries from the grid. Forget the solar panels. That puts everything inside the house for improved security.

Jun 27, 2022 - 8:05:31 PM

131 posts since 1/17/2019

Several years ago in July we were out of power for a week. Up to then we would have a few short term outages. So I got a 20kw whole house generator..already had a 500 gallon propane tank buried.

Since then we rarely have outages….Boy That purchase was the best insurance policy for not losing power …..from the grid……it hardly ever goes out!

Jun 28, 2022 - 12:30:22 AM
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4290 posts since 4/22/2018

quote:
Originally posted by stevebsq

Several years ago in July we were out of power for a week. Up to then we would have a few short term outages. So I got a 20kw whole house generator..already had a 500 gallon propane tank buried.

Since then we rarely have outages….Boy That purchase was the best insurance policy for not losing power …..from the grid……it hardly ever goes out!


Sod's law eh?  We are at the end of the line  so to speak with our power supply.  We probably have 2 outages a year up to the best part of a day and then in extreme weather (for the U.K.) it can go out for a couple of days maybe every 2-3 years.  I bought a 3.5kw inverter generator that will run the house as long as we don't use the electric stove or shower.  It does the job nicely enough.

Jun 28, 2022 - 4:05:43 PM
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Brian T

Canada

19319 posts since 6/5/2008

A battery-based system is so simple to assemble (black to black, red to red) , I didn't see the point of buying a ready-made set-up.

The significant detail is in the type of AC that the inverter puts out. Square wave and modified sine wave inverters can run lights and stuff but not motors. Motors start with a HUGE inrush current from power off to power on. These 2 inverters pause at zero like power off. So power on in the next part of the AC cycle and the motor thinks it's a cold start 60 times per second. Still learning, I tried to run an electric drill and the power drain was impressive.

For lights, it doesn't matter as the flicker is so fast you can't see it with retina retention.

I have an 800W square wave inverter, inexpensive. I can decorate my Suburban with Christmas lights, install the inverter under the hood and go tooting around town at Christmas time, all lit up!

The third kind of inverter is the "pure sine wave" type. Much more expensive that the other two. The AC power wave form slides right through zero from positive to negative and back again without stopping. So this inverter can run anything and everything. Once a motor is turned on, it stays "power up" running without the big inrush current until the next real start.
Mine is 1,500W 117VAC and cost less than $300. NEVER start the inverter with stuff plugged in waiting for 117VAC. Those fancy inverters will poop out on you before you can pull the plug.

The first time you get up and the power is off and you need to grind the beans for the coffee, push one button on the inverter and do your thing. I ran a fat line up thru the floor to the kitchen to a quad box on the wall. That paid for everything in my head.

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