Author Topic: What size battery to power my HiFi ?  (Read 3839 times)

Offline Bernard

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What size battery to power my HiFi ?
« on: September 06, 2020, 10:50:15 AM »
Rotel 100W integrated amp.
Logitech Squeezebox.
B&W DM 330 floor standers.

I have a big invertor (in the roof) which was connected to 4 deep cycle batteries in 2008 when Eskom first started. Batteries were replaced a couple of times.

Two separate explosions under my desk, so I put the invertor in the roof and the batteries outside. Never to be used again.

How many batteries would I need for music for 2 hours, say ?

Would be awesome if it's only a battery or two required.

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Offline Curlycat

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Re: What size battery to power my HiFi ?
« Reply #1 on: September 06, 2020, 11:52:07 AM »
What voltage is your inverter?

My setup, a PC, 50" LED TV, valve-pre, amp, router, fibre-box & a CFL light draws about 300W

I use a 120Ah LifePO4 battery which gives me about 1440 Watt hours to use on a 12V system
If I drain my battery completely (not a good idea ) I should be able to get 4.8 hours of use.

You can calculate your power requirements the same.

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Offline Bernard

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Re: What size battery to power my HiFi ?
« Reply #2 on: September 06, 2020, 12:03:48 PM »
It's a 12 volt inverter. It's been packed away for a few years but can handle the HFi and PC and printers, lights etc. That is what it was used for originally.

I stil have a biggish 36v invertor but when a battery exploded I packed it away as well due to lack of funds.

I'm even happy to swap it out for a 12v inverter. Can't see our situation changing to allow for multiple batteries.

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Offline Bernard

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Re: What size battery to power my HiFi ?
« Reply #3 on: September 06, 2020, 12:05:23 PM »
What voltage is your inverter?

My setup, a PC, 50" LED TV, valve-pre, amp, router, fibre-box & a CFL light draws about 300W

I use a 120Ah LifePO4 battery which gives me about 1440 Watt hours to use on a 12V system
If I drain my battery completely (not a good idea ) I should be able to get 4.8 hours of use.

You can calculate your power requirements the same.
What is the cost, more or less, on that type of battery ? That sounds like just what I need.

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Offline Curlycat

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Re: What size battery to power my HiFi ?
« Reply #4 on: September 06, 2020, 12:13:08 PM »
I purchased my cells loose and added a BMS - you need a Battery Management System for LifePo4 (Lithium Ion Phosphate) It was about R6.5K.

I purchased mine here: (sold out currently but sure there is a shipment on the way)
https://lithiumbatteriessa.co.za/collections/frontpage/products/3-2v-120ah-lithium-ion-phosphate-battery-cell?variant=31982240825434

And here you can read more about LifePo4 tech and safety:
https://lithiumbatteriessa.co.za/pages/about-lifepo4
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Offline Curlycat

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Re: What size battery to power my HiFi ?
« Reply #5 on: September 06, 2020, 12:16:49 PM »
Takealot sells complete batteries, just connect up and use, R10 800 for a 108AH.

https://www.takealot.com/lithium-iron-phosphate-12v-battery-108ah/PLID54968968
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Offline Bernard

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Re: What size battery to power my HiFi ?
« Reply #6 on: September 06, 2020, 12:31:57 PM »
OK......those numbers are way out for us. I may just get another single102Ah solar battery and make do with that. (SO was also retrenched during Covid so we're taking a big knock. My pension, years ago, went to paying off the house)

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Offline Bernard

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Re: What size battery to power my HiFi ?
« Reply #7 on: September 06, 2020, 12:34:43 PM »
Just out of interest.....what is the difference between those R10 000 batteries versus a regular deep cycle solar battery if around R2000 ?

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Offline Curlycat

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Re: What size battery to power my HiFi ?
« Reply #8 on: September 06, 2020, 12:42:37 PM »
Sorry to hear about your current situation. Don't lose hope.

In short the LifePo4 battery lasts many cycles - usually upwards of 2000 cycles. So you don't have to replace them as often as lead acid. They are safer than lead acid. They charge much faster than lead acid. Their usable range is more than lead acid, in other words for example a 100Ah Lifepo can compare to a 200Ah lead acid actual use - (just a hypothetical example, I did not do the sums here)

In other words apart from the price, better in all other aspects compared to lead acid.
« Last Edit: September 06, 2020, 12:44:49 PM by Curlycat »
I have realized that the past and future are real illusions, that they exist in the present, which is what there is and all there is.  Alan Watts

Offline chrisc

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Re: What size battery to power my HiFi ?
« Reply #9 on: September 06, 2020, 02:49:48 PM »
Its Lithium-Ion technology as opposed to lead-acid

Think Tesla cars and all new electric cars.  The power to weight ratio is far better, more charge/discharge cycles (provided you don't continually go too low)

My 6Kw inverter has a 600 a/h li-ion battery and it has powered the house (not the geyser) for 12 hours at a stretch and was only 33% discharged
Music is the shorthand of emotion

Online Wolla

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Re: What size battery to power my HiFi ?
« Reply #10 on: September 06, 2020, 03:24:15 PM »
Rotel 100W integrated amp.
Logitech Squeezebox.
B&W DM 330 floor standers.
...
Bernard, you know I also like the Rotel you have there  :thumbs:

if you do not want to spend a lot of money, you can purchase a small stereo chip-amp which will run happily from a 5V power bank and run for days on a single charge. It should cost no more than a few hundred Rands if you already own a 5V power bank. Once load shedding is shelved, you can always just remove the small chip-amp again.

You will just have to make a plan with a source.

Im using a small ZAR65 chip-amp permanently now and drive my 4 Ohm Piega full rangers, so I can assure you that it sounds good enough to me and could work just fine for lots of other music enthusiasts.
« Last Edit: September 06, 2020, 03:47:18 PM by Wolla »

Offline Crashappy

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Re: What size battery to power my HiFi ?
« Reply #11 on: September 06, 2020, 03:34:39 PM »
Running my Marantz driving Capellas, 55" tv, 2 decoders, router and switch using Mecer power system.
2 x 12V batteries, 1440W, 2.4kva.
Cost me 9.5K

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Online Wolla

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Re: What size battery to power my HiFi ?
« Reply #12 on: September 06, 2020, 03:48:38 PM »
Running my Marantz driving Capellas, 55" tv, 2 decoders, router and switch using Mecer power system.
2 x 12V batteries, 1440W, 2.4kva.
Cost me 9.5K

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Nice, but what do you do with the fan noise?

Offline Crashappy

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Re: What size battery to power my HiFi ?
« Reply #13 on: September 06, 2020, 03:50:48 PM »
Dead quiet fan at my watching levels

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Offline Crashappy

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Re: What size battery to power my HiFi ?
« Reply #14 on: September 06, 2020, 03:53:09 PM »
Fan is louder under recharge conditions

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