Make your own 220 Volt backup power supply

What people don't understand is that a lead acid battery cannot be discharged below a certain voltage. If you do the battery components become damaged.

It also take a hell of a lot of current from the battery to generate AC. The current approach is to convert the available DC power into 350V DC at plenty of current and then using a h-bridge to convert that to a pure sine wave. Some of this design concept is used in motor variable frequency drives.

Large UPS/backup solitons such as Emerson generate the 415V DC supply by using many lead-acid batteries in series. This is then converted to 3 phase AC by means of h-bridges driven by software on an embedded microprocessor
 
Compton_effect said:
Having a backup battery system only, long term its a costly idea. Adding solar in so that its off the grid (or grid tied)may be worth it in the long term. But I think its about the scale of it. System to power your entire house, vs taking off the essentials.
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Agreed.
My first step is to get battery backup on my bare essentials.
Next is a big ass inverter, battery bank and solar. Busy gathering quotes.

What we also need to do is water. With everything failing, water is next.
April I am getting a 5000L in line tank and pump installed. Should keep us going for about 3 days if the water supply fails for whatever reason.
 
Mike Smit said:
Agreed.
My first step is to get battery backup on my bare essentials.
Next is a big ass inverter, battery bank and solar. Busy gathering quotes.

What we also need to do is water. With everything failing, water is next.
April I am getting a 5000L in line tank and pump installed. Should keep us going for about 3 days if the water supply fails for whatever reason.
Click to expand...

The cost involved?
(Wish I could get a greywater system for my house - 30% of your water goes down the toilet.)
 
akescpt said:
but yet our solutions are centered around these inefficient products. are we being alarmists by spending all this money? if the other power stations come online will our expensive setups be relegated to relics? should we just be enduring the 2 hours a day. bought an inverter last night and ever since I hit 'Pay' these questions have been floating around in my head.
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Aaaah I see where you're coming from.

It's not going to get better. Been there done this...
 
akescpt said:
seems like these batteries are designed so that you need a lot of them. at R2000 its not cheap but I can only use it till 80% because a discharge bigger than that will make the life shorter? why don't they make proper batteries then. sounds a bit shyte.

yes there is a lot of science but it just pi$$es me off when you have to spend so much but then you need 10 times the amount of batteries because you can only discharge to 80%. if we could use other products like this would we still be so eager to buy it?
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The accepted discharge rate for deep cycle lead acid batteries is 50%, not 80%. In other words, you should not run them down below 50% charge without risking long-term damage to them.
 
ive been researching and come across this battery description:

Lead Crystal Batteries - Betta Batteries from Deltec

BENEFITS
•RECYCLABLE Up to circa 99% - and far fewer batteries need be produced/used.
•GREENER No dangerous acid mist or harmful gas emissions. Non-corrosive. Significantly less pollution. ISO 14001 certified.
•SAFER No toxic fluid. No hazardous emissions. No risk of explosion.
•EASY TRANSPORT Classified as non-hazardous for transportation. The only battery allowed for air-freight as normal goods.
•GUARANTEED QUALITY Each battery comes with a standard 3 year factory guarantee - ISO 9001 certified.
•BETTER USAGE PERFORMANCE Charges 20% - 40% faster than conventional alternatives. Excellent high current discharge ability.
•FULL RECOVERY Can be 100% discharged and then restored to full-rated capacity daily, with no risk to battery life.
•LONG BATTERY LIFE Service life of 18-20 years at 25°C. Up to 3,100 charge/discharge cycles.
•LONG SHELF LIFE Can be stored for 2 years with no additional charging. Simplifies Logistics.
•EXTREME TEMPERATURE RESISTANCE Operates at temperatures from -40°C to +65°C
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are these people talking kark? these claims go against everything being said on here about discharging batteries. are these suitable for backup power solutions. these batteries cost more than deep cycle batteries.

http://www.bushpower.co.za/products.asp?pid=583
 
akescpt said:
ive been researching and come across this battery description:



are these people talking kark? these claims go against everything being said on here about discharging batteries. are these suitable for backup power solutions. these batteries cost more than deep cycle batteries.

http://www.bushpower.co.za/products.asp?pid=583
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That battery is not a deep-cycle battery and is not suitable at all as a replacement power supply during load shedding.

This battery is more suitable:

http://www.bushpower.co.za/products.asp?pid=349
 
deweyzeph said:
That battery is not a deep-cycle battery and is not suitable at all as a replacement power supply during load shedding.

This battery is more suitable:

http://www.bushpower.co.za/products.asp?pid=349
Click to expand...

that shipping would be killer. the people who can drive till there can take that deal. trying to locate batteries down here in the cape is not so easy or cost effective.
 
deweyzeph said:
That battery is not a deep-cycle battery and is not suitable at all as a replacement power supply during load shedding.

This battery is more suitable:

http://www.bushpower.co.za/products.asp?pid=349
Click to expand...

Why do you say that the above is not suitable for deep cycle?

Page 4

The Deltec lead crystal range has been specifically created for deep
cycle, applications resulting in extended battery life and reliability and
signals a break through in superior battery solution
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http://deltecpower.co.za/wp-content/uploads/2013/12/Deltec-Lead-Crystal-Batteries.pdf
 
deweyzeph said:
That's just the way the chemistry works. You're welcome to discharge your deep cycle batteries to 100% if you want, but don't expect them to last. 400 cycles is nothing by the way. A 102AH battery costs anywhere from R1700 to R2500 per battery. You really want to make sure they last as long as possible.
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For real ? 400 cycles at 100% dod is nothing ? 80% of batteries on the market only give you 250 cycles at 50% dod. go figure.

lsheed_cn said:
I'd still like to have more details on the batteries you say can discharge 100% with 400 cycles, just so I can look the data sheet up, and concur. Typically its 80% DoD for 400 cycles with good quality Lead Acid.

100% DoD would likely be in the 100-150 cycle range - or a few months lifetime at daily charge/discharge rates.
30% DoD is typically the sweet spot for price / lifetime for Lead Acid, however at that point, other chemistries start to look interesting - eg LFP.

Your money though..
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I'll send you a spec sheet, please pm me your email. I also want to know if you can source me the LiFePO4 batteries so one time we can discuss everything.
 
I've been doing some reading and the lead crystal looks good, but ONLY if you use a charger recommended for lead crystal.
 
mister said:
I've been doing some reading and the lead crystal looks good, but ONLY if you use a charger recommended for lead crystal.
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On paper yes. I haven't found a lead crystal that beats lead acid in terms of cycles at 30% or 50% dod according to the datasheets.
 
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