Is this battery compatable with the lepai LP 2020A+? I know it only has 2.5ah but I am primarily more concerned about weight and not long lasting battery life.
https://www.batterysharks.com/Universal-Power-UB1222-D5739-p/ub1222_b12-2.3.htm
Also, if you have time:
I'm wondering if there is a thread you can point me to to make a few basic BEGINNER mods to my new lepai. I'm looking to build a cheap portable and rechargeable audio system for my bicycle. So I'm thinking I'll use the 2 lb battery, the lepai, and some Micca MB42 speakers and all in all it will weigh in under 10lbs.
Let me know what you all think!
Amazon.com: Micca Motion Series MB42 Bookshelf Speakers With 4-Inch Carbon Fiber Woofer and Silk Dome Tweeter (Black, Pair): Electronics
https://www.batterysharks.com/Universal-Power-UB1222-D5739-p/ub1222_b12-2.3.htm
Also, if you have time:
I'm wondering if there is a thread you can point me to to make a few basic BEGINNER mods to my new lepai. I'm looking to build a cheap portable and rechargeable audio system for my bicycle. So I'm thinking I'll use the 2 lb battery, the lepai, and some Micca MB42 speakers and all in all it will weigh in under 10lbs.
Let me know what you all think!
Amazon.com: Micca Motion Series MB42 Bookshelf Speakers With 4-Inch Carbon Fiber Woofer and Silk Dome Tweeter (Black, Pair): Electronics
As I've been trying to figure this out, I'm thinking that this battery might be putting out AC? I would then either be looking for a DC battery or a AC to DC converter. Is this the case? if so, which option would be lighter if I only need about 2-3 hours of power.
I don't know what I was thinking when I posted that. Of course they all use direct current, there is nothing to alternate it. hahaha. Anyone have an answer for the other stuff???
If you push this amplifier to something near full power, you won't get much more than 30 minutes of battery life with the 2.5ah battery.
At 85dB, the speakers are not very efficient. They will require a lot of amplifier power to produce even a modest volume level.
At 85dB, the speakers are not very efficient. They will require a lot of amplifier power to produce even a modest volume level.
Huh?
Surely, you mean about 6 hours.
A TA2020 chip uses 360mA into 4 ohm at full volume before clipping. The Lepai amp unfortunately have a quite powerhungry power LED which is a bad idea in these kinds of amps, so power consumption of the lepai is 415mA at full volume into 4 ohms.
If it's weight as a main consideration, you may not want to use a lead acid type (which that one is) and look into nicad or lithium types.
Here are some of the solutions I have used in a stereo backpack that I have built. I use it skiing, camping, beach, and traveling for work and pleasure.
10 AA Rechargeable Batteries I prefer Eneloops
Amazon.com: Battery Holder - 10 Aa: Camera & Photo
Pros: Cheap, batteries can be used in other devices that use AA batteries, works well in extreme weather cold/heat.
Cons: at full volume only 3 ½ hours to 4 hr before you get distortion. You will need 20 AA’s to play about 8 hours at full volume. Pain to charge that many batteries even with quick 15min charger.
10,000mah Lithium Ion battery. Ankar 5v, 9v, 12v external battery
Amazon.com: Anker Astro3 10000mAh Multi-Voltage (5V 9V 12V) Output Portable Power Pack External Battery Charger for iPads, Samsung Tablets, iPhones, Android Smart Phones, Camcoders, Digital Cameras / DV Recorders (Dual USB Output: 5V, 2A; DC Output:
pros: Weight .6 lbs, can charge USB Device mp3, phone. At full volume will last 8+ hours. Can power multiple devices at the same time.
cons: 12v output is regulated to 2A if your device draws more than 2A when powered on the battery shuts off. I got around this by setting the battery to 9v when I turned amp on then slid the switch to 12v. Not good in extreme cold 10 degrees F or colder
18000mah lithium ion Energizer xpal 18000a external battery. 5v, 12v 20v
Amazon.com: Xpal Power XP18000A Energizer External Battery Blk: Cell Phones & Accessories
Pros: weight 1.2lbs, Capacity, will last several days. Can power multiple devices at the same time including ipad and computer and t-amp. Can power Topping TP22 which uses 20v or other amps that require more voltage. Has cables and tips for just about any device you might need to charge while traveling.
Cons: Cost 169.00 if you can find it(Always sold out). Make sure to get the xp18000a because the xp18000 cannot charge ipad. Which require 5v 2.1. Not good in extreme cold 10 degrees F or colder
Here is a Youtube link of the backpack up at copper mountain Colorado.
Perfect Spring Day at Copper Mountain April 2013 - YouTube
10 AA Rechargeable Batteries I prefer Eneloops
Amazon.com: Battery Holder - 10 Aa: Camera & Photo
Pros: Cheap, batteries can be used in other devices that use AA batteries, works well in extreme weather cold/heat.
Cons: at full volume only 3 ½ hours to 4 hr before you get distortion. You will need 20 AA’s to play about 8 hours at full volume. Pain to charge that many batteries even with quick 15min charger.
10,000mah Lithium Ion battery. Ankar 5v, 9v, 12v external battery
Amazon.com: Anker Astro3 10000mAh Multi-Voltage (5V 9V 12V) Output Portable Power Pack External Battery Charger for iPads, Samsung Tablets, iPhones, Android Smart Phones, Camcoders, Digital Cameras / DV Recorders (Dual USB Output: 5V, 2A; DC Output:
pros: Weight .6 lbs, can charge USB Device mp3, phone. At full volume will last 8+ hours. Can power multiple devices at the same time.
cons: 12v output is regulated to 2A if your device draws more than 2A when powered on the battery shuts off. I got around this by setting the battery to 9v when I turned amp on then slid the switch to 12v. Not good in extreme cold 10 degrees F or colder
18000mah lithium ion Energizer xpal 18000a external battery. 5v, 12v 20v
Amazon.com: Xpal Power XP18000A Energizer External Battery Blk: Cell Phones & Accessories
Pros: weight 1.2lbs, Capacity, will last several days. Can power multiple devices at the same time including ipad and computer and t-amp. Can power Topping TP22 which uses 20v or other amps that require more voltage. Has cables and tips for just about any device you might need to charge while traveling.
Cons: Cost 169.00 if you can find it(Always sold out). Make sure to get the xp18000a because the xp18000 cannot charge ipad. Which require 5v 2.1. Not good in extreme cold 10 degrees F or colder
Here is a Youtube link of the backpack up at copper mountain Colorado.
Perfect Spring Day at Copper Mountain April 2013 - YouTube
360mA into 4 ohms is only 0.5W. You are talking only about the current the chip itself wastes.
At full power, the amplifier will draw between 4 and 5 amps. A 2.5ah battery will last about 30 minutes ... perhaps a little longer.
Two things. First, at full power, the distortion is unbearable. Second, music is dynamic. Which means that unless your favorite song is a sine wave, average power output will be probably be around 1 or 2 watts, even at what seems to be a high volume.
I found the following through testing with a pure sine wave and an ampere meter on the input side:
~13.5Volt, 50Hz&1Khz stereo signal.
8 Ohm speakers: ~1Amp before clipping. 2 Amp was the max with severe distortion.
4 Ohm speakers: ~2Amps before clipping. >3Amp saturated square. (Analog ampere meter was only good til 3amps)
So with that battery it would be between 2.5h and 1.25h of full power undistorted sine wave, depending on the impedance.
Wiping off the tone&preamp circuits also helps preserve some power.
With the tone&preamp circuit intact, it idles at 150mA. Without them, just about 90-100mA.
~13.5Volt, 50Hz&1Khz stereo signal.
8 Ohm speakers: ~1Amp before clipping. 2 Amp was the max with severe distortion.
4 Ohm speakers: ~2Amps before clipping. >3Amp saturated square. (Analog ampere meter was only good til 3amps)
So with that battery it would be between 2.5h and 1.25h of full power undistorted sine wave, depending on the impedance.
Wiping off the tone&preamp circuits also helps preserve some power.
With the tone&preamp circuit intact, it idles at 150mA. Without them, just about 90-100mA.
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Help
hi there im also using the lepai lp2020+ and to say the least im a bit of a nooby but was wondering if anyone could tell me would this work
DEOK AC/DC 24V to DC 12V CCD/CCTV Regulated Power: Amazon.co.uk: Electronics
with this battery
Yuasa NP12-12 12Ah 12V Sealed Lead Acid Battery: Amazon.co.uk: Electronics
if not could someone please give me the relevant converter required to run it.. much appreciated
hi there im also using the lepai lp2020+ and to say the least im a bit of a nooby but was wondering if anyone could tell me would this work
DEOK AC/DC 24V to DC 12V CCD/CCTV Regulated Power: Amazon.co.uk: Electronics
with this battery
Yuasa NP12-12 12Ah 12V Sealed Lead Acid Battery: Amazon.co.uk: Electronics
if not could someone please give me the relevant converter required to run it.. much appreciated
I use a Lepai 2020A to power some portable speakers at outdoor events. I have cut the trace to the coil, and soldered in some jumpers across the protection relay to save some quiescent power, but it isn't all that necessary. I have run the system all day long on 10 AA NiMH batteries (2200 mah). As long as you don't push the amp into clipping enough to sound bad, the current draw is under 200 ma average on normal music. The crest factor on music is what saves you.
Marc
Marc
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