Back up batteries - emergency preparation

[Disco Dan]

Back up batteries - emergency preparation

You may of heard of people in NZ fitting solar cells to their homes and actually creating a positive amount of energy that they return to the grid.

You may also of heard of battery backup systems - where a battery bank is installed in your home and in the event of a power cut your appliances continue to run. This is along the same lines as a computer UPS but on a larger scale to run several/all home appliances.

Battery banks are relatively simple to construct, as well as a black out relay.

The main things are the high cost of batteries and ensuring a way of recharging the battery bank. It is important to note that the wiring can get complicated!

So does anyone have a battery backup system installed already? How/where did you mount everything and where is the best place to get deep cycle batteries?

I'm researching ways in which to power a large aquarium, security system and also limited lighting (even computer). A standard computer UPS is simply not large enough power all of the items so I am looking into either a large battery bank located outside in a weather proof box and routing the wiring inside to the appliances.

Making a control box with indicator lights, override switches and meters.

Anyone have any experience with this sort of thing??

[ManDownUnder]

If it's only "non continuous load", buy a little generator and make sure the fuel's full.

Key start is good, remote start better.

[Disco Dan]

With the cost of fuel and the safety factors around storing fuel (treating it for storage and replenishing old fuel) the generator option is not really ideal. Especially when this system will be automatic - ie I don't want to be out/working when the power cut occurs and a generator fires up unattended!

I would prefer to be off the grid entirely however batteries are the next best thing!

I'm aiming for 8 hours use - when your standard UPS lasts only 1-3 hours I will be needing a lot of batteries I think!

However a small generator could well serve my purposes well - depending on how much fuel it would use. Ie - how much fuel I would need to store (inside) to power everything I want for upto 8 hours.

[bungbung]

Work out what your load will be first, go from there. You can buy pretty big UPSs, work out what size inverter you'll need and then how much storage you'll require for 8 hours.

Example: Std single PC UPS is around 350-450VA, if this can run your needs for one hour, then you'll require 8 x the battery capacity, simply replace the (probably) 7Ah batteries (s) with the eightfold equivalent. Should be several battery shops in AKL.

[nodrog:Me]

..... and the safety factors around storing fuel...(

storing a heap of big batteries with dodgy wiring presents its own risks, make sure your smoke detectors are working.

[Disco Dan]

Well load wise this what i'm after -

Computer is easy 280w
Aquarium - x3 50w lamps, fluro tube (w?) filter (w?)
Lighting - one 100w bulb would be sufficient.

Roughly looking at at least 600w to be safe.

[Disco Dan]

storing a heap of big batteries with dodgy wiring presents its own risks, make sure your smoke detectors are working.

Yes very true, the web pages on battery storage I have found outline how to vent batteries and storage options etc.

ie - a kitchen cupboard lined with fireproof material, vented outside with fuses on the wiring.

Much prefer to have a cupboard full of acid filled batteries than cans of petrol/diesel !

[nodrog:Me]

Yes very true, the web pages on battery storage I have found outline how to vent batteries and storage options etc.

ie - a kitchen cupboard lined with fireproof material, vented outside with fuses on the wiring.

Much prefer to have a cupboard full of acid filled batteries than cans of petrol/diesel !

beware if your house burns down (for whatever reason) and you have an uncertified mini powerstation under you kitchen sink, your insurance company might be less than helpful.

[bungbung]

Well load wise this what i'm after -

Computer is easy 280w
Aquarium - x3 50w lamps, fluro tube (w?) filter (w?)
Lighting - one 100w bulb would be sufficient.

Roughly looking at at least 600w to be safe.

You need to know your inverter efficiency, lets say 90% (according to Google), so 666W input for 8 hours = 5.4kW/h.

That is 441Ah @ 12V so you'll need 6 of 12V 80Ah batteries.

[vifferman]

So does anyone have a battery backup system installed already?

Mate, I don't even have the emergency bottle'o'water, can of baked beans, torch, radio, first aid kit...
If there's an emergency, I'll just hide in the wardrobe...

[Morcs]

Tropical fish can survive for a good few hours with no light or heat.

for security - just get one of those huge police torches and youve got a good weapon and a light

Calm down Dan, the germans arent coming.

[vifferman]

Tropical fish can survive for a good few hours with no light or heat.

So.....
I should eat lots of tropical fish?
(There's some good-sized goldfish in our pond, but I bet they taste like shit...)

for security - just get one of those huge police torches and youve got a good weapon and a light

Yeah, but I've got a few litres of mower fuel and some waste engine oil in the gargre - that'd be more fun for both purposes.

[pzkpfw]

If there's an emergency, I'll just hide in the wardrobe...

I'm planning to eat the neighbours.

[vindy500]

if your power goes out it doesnt really matter if your tanks lights turn off, just make sure the heater and filter keep going

[scracha]

I've got 3 x 650Va UPS's (they're under $100 each) connected in a serial type fashion. A genny is on the todo list (be useful at the track too). Otherwise you're getting a sparky in and spending lots of peso's. After investing lots of peso's, be aware that the batteries wear out in a shortish period of time.

Why on earth would you wanna keep the computer going though Buy a laptop and some spare batteries for it.