battery requirments

Hi, I am currently using 2x 6v 1.3 AH SLA batteries to power a 3w LED globe. will these batteries be ok to power this LED for around about 1 hour or will this be pushing it.

Posted by BrianW109 2 years ago


How come there is no SLA charger circuit on instructables? Answered

Are there any simple SLA solar or  stepper Wind mill charger controllers here, can someone draw one? I have auto relays and rectifiers and want to use a giant stepper and a 30-40w solar panel and poll the power and charge a 10amp SLA.. what is a simple circuit with cuts the charge with 14.5 and starts it with 11v ... I have one but it's old and I can't identify the components.. can someone make this more understandable?

Asked by celalboz 8 years ago


May I be advised on powering cheap lasers from this device? Answered

I've got a "6V" SLA connected to it's original charger. It's currently driving a motor with a mirror glued to it, I want to add a couple of cheap laser modules to the same power supply. >SLA  charges at over 7V >No load voltage is less than 6V >When running the motor the voltage across the terminals is less than 5V I do have a couple of UA79M12C -ve voltage regulators, and think I should use one. The cheap lasers are built to run from 3 button-cells (~4.5V) Advice appreciated L

Asked by lemonie 6 years ago


What does it mean that the battery I have is rated to discharge at a 20 amp/hour rate ? Answered

I have a 12 volt 5 amp/hour sla battery.  It says it is rated at a "20 hour discharge rate".. What does that mean.  I think that means it is the shortest amount of time the battery could be discharged before damaging the battery.  Is that right ?

Asked by Noblenutria 7 years ago


This Stepper produces how much miliamp/amp? Answered

6 wires so it's 3 phases after I rectify with 3 briges and a 10 x 8500 mf 65v caps and regulate with power zeners, how much current will I get, can I trickle charge an 10amp sla? Stepper is 2.5" x 3 cube SANYO DENKI TYPE  103H7123-0642 DC 2.5A 1.8 DEG 2.5v-6v each coil I get

Asked by celalboz 8 years ago


How to connect Arduino and Raspberry Pi together with one SLA 6V 4A battery.

I am planing to use step up dc to dc voltage regulator for both of them. Can i simply connect the regulators polar to SLA battery's + and - ? At the same time, SLA battery is charged by solar power which controlled by arduino.

Asked by ozmos 1 year ago


why does the battery measure 19v when I use a laptop brick to charge via circuit instead of 17v? Answered

Reason for my question,   my jump starter circuit board  which i think it takes 17v but I am using a 19v laptop PSu to power it, with a 12v sla but when I check the battery voltage it is showing 19+ volts, why didn't the charger circuit lowered the voltage and regulate to 13.7 or 14v? reading 19+ probably not good for the test SLA ? can i use multiple diodes in series  to lover my input 19v to exactly 17v dc will this make this charger circuit work properly, I have tested two different brand same reading. what gives? thanks Al

Asked by celalboz 6 years ago


How do I use a relay in a charging circuit? Answered

I am trying to make a charging circuit where the power switches to a secondary load once 14.8 volts is reached.  This is to charge 5 amp hour SLA battery.  Someone told me to use relays but I am not sure how to do it.  Do I need a relay that switches at exactly 14.9 volts?

Asked by Noblenutria 7 years ago


can i charge this battery with a solar charge controller? Answered

I have recently bought this solar charger kit from amazon.com (http://www.amazon.com/gp/product/B004FOEUI0/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1) and was curious if i could charge two of these small sla batteries hooked in a parallel to power a project. If it is too much power how would i bring it down to a safe level for the batteries? help would be appreciated thanks: Harry

Asked by harry88 5 years ago


New type of 3d printing

This is a sample of a new style of 3d laser printer. or Stereolithography. I  have not seem a similar setup like the one im proposing (please let me know if it already exist) I have a good understanding of mechanics, but I'm clueless on computer programing and electronics. What I propose would be a rotating laser device that would create SLA model from 3d printing design. The main benefit that i would hope this design offers is a quiet smooth operation. Would Ideally work with high rpm ( Similar to conventional cd/dvd burners operation, except the laser rotates instead of the cd). Ideally this setup would allow for fast production of multiple prints in a single process. If anybody has a computer/electrical background who would be interested in working on this type of desgin , please let me know. Here are some pictures of how the setup would work

Posted by james123cb 6 years ago



Overfilled SLA (lead acid) help!

What should i do its just leaking gas (I assume its hydrogen) should i keep chargeing till this stops or what? thanks for helping

Asked by Daniel Deacon 6 years ago


Voltages for 7AH, SLA batteries

So I've read all on the web about the voltages of a lead acid battery, and according to sites like This One the battery should be full at 12.69v or so. The only thing is I'm getting 13.02v on one SLA, and 13.08v on another. One of the batteries is brand new, and the other is out of a UPS. Are these batteries badly overcharged, or am I just really ignorant and can't find a simple site listing SLA voltages :) The batteries were not connected to anything for about 12 hours before I took the readings, and I have tested the multimeter I used, and it is accurate.If it helps, the battery says:Constant voltage charge(25C)- Cycle use: 14.5-14.9V- Standby use: 13.6-13.8V- Initial current: 2.1AAny advice / help would be greatly appreciated!PS) The main project is powering a computer with these batteries. I've done that so far and it draws only around 1.8A, so hopefully it could last for quite long! (~5 hours or so)

Posted by cb22 10 years ago


Charging SLAs from DC

Hi Instructables community! I am building a K9 robot - one that is going to be covered in solar cells-in such a way that I get a voltage / current ratio of a pretty high number. I plan to charge my SLA partially via these cells so I can lengthen the space between charges. Unfortunately, my 6V 4.5Ah SLA battery is charged via a plugin adapter and I do not wish to pull it apart unless there is no other choice - so is there are a way I can charge my battery from a constant DC voltage? If so, do any of you know what voltage/currents I'd need to feed it? I can get most any current/voltage specs via transistors and voltage boosters - just I don't know the equation. Thanks for all your help! Jonathan Davis NitroJon Labs

Posted by nitrojon 6 months ago


Home-made UPS? Answered

I recently acquired a very large 12V SLA battery and want to make a UPS for my computer. I think I have the basic idea, but I'm not entirely sure how I would go about this. I'm guessing I could use a relay to switch from the mains to battery, but then I would need a very large capacitor to run the equipment for a few milliseconds whilst it switches. I would need a separate transformer and regulator for the relay, and also an inverter for the battery, which I will probably buy as it looks like it would be too hard to make. Is this the right approach to it?

Asked by andy70707 7 years ago



can you answer a few questions i have on SLA batteries? Answered

1.As you can see in the diagram i have eight 4.5 AH SLA batteries joined together to make four 12 volt 9 AH batteries. how would i incorporate my bigger 7 AH 6 volt SLA into this? 2.Is my math correct that i did up in the corner? 3.Does an amp an hour storage in a battery mean it will supply one amp for one hour? 4.If so and my math is correct i would have 516 watts of power for one hour stored in these batteries?

Asked by harry88 5 years ago


arduino Clones?

Are they really as good as arduino's?

Asked by Daniel Deacon 6 years ago


Would it be ok to run 2 12v 4A SLAs in parallel to give 8A and connect in series with a 12v 8ASLA for 24v 8A?

I'm building an electric go-kart from a bustup mobility scooter and the problem is this. I don't have cash around to buy batteries but do have 2 x 12v SLA @ 4A and 1 12v SLA @ 8A. Would wireing them in the diagram below work OK. Part of me is saying I missing something. The reason I need 24v above 4A is to power the S-Drive controller & 24v Motor. I'm not sure of the the motor ratings as the label is damaged and can only make out 24v Brushed. I'm also using the S-Drive as I have 3 of them lying around, they're programable and can also handle upto 45A. Any advice would be greatly apreaciated as my son is excited about the project as at the moment its just a battery issue.

Asked by CyberR 1 year ago


How can I tell when my SLA batteries are charged? Answered

I have three, 12v, 22ah SLA batteries wired in series to make a pack that is 36v and 22ah.  The charger I have is the very crude kind which is essentially just a transformer.  It says it outputs 36v at 1.6a. The batteries are empty, this will be the first time I am charging them.  How can I tell when then are finished charging?  Can I use a multimeter? If not, then what? Thank you in advance for your help.

Asked by ___ 6 years ago


Do you always need a buckpuck for high powered LEDs? Answered

I want to power a Cree MC-E LED with a 12 volt 5 amp/h SLA battery.  Most of the time you have to use a buckpuck (an LED Driver).  Do you always have to use a buckpuck?  If I have a 12 volt battery and a 12 volt LED like the CREE MC-E, then I don't need a driver, right? Thanks Jacob

Asked by Noblenutria 8 years ago


Solar Boombox Upgrade

Ok so im looking to upgrade my DIY portable boombox for the 2nd time and one of the things i want to add is a solar panel to supplement the battery power from my 12v 7ah sla battery, that by itself will currently run the thing for about 3hrs at full blast. The new version will have Directed CSX-650 component speakers: (bottom of this page) http://www.lightav.com/car/directedaudio/directedspeakers.html and the amp will be one of these: http://shop.41hz.com/shop/item.asp?catid=42&itemid=43 , so what id like to know is what tech spec should i be looking for in a solar panel that would be capable of charging the battery while the boombox is not in use and will supplement the battery power to extend the run time while it is in use? Also will i need some kind of circuit/component to prevent overcharge of the battery? Oh and is there some kind of simple light/gauge i can wire in to show the charge level of the battery?

Posted by ambientvoid 7 years ago


Lowest wattage Possible Computer for "World Of Warcraft"? Answered

Hello, I am looking for a low power (watts) pc to play world of Warcraft  I'm talking of a custom build computer Reason: I'm into solar power and green energy I have 2 Solar panels 1 15 watt panel and 1 30 watt panel. I like to play around and tweak computers ---- Aim: to get the lowest possible wattage computer to play world of Warcraft =========================================================== What I need you to do: Advise me on what components I need to buy example SSD hard drive ----------------------------------------------------------------------------------------------------------------------------------- Budget:  I'm afraid I'm on a budget at the moment as i only get paid £120 a month with £0 in the bank i can save up for a few months if required however. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Size: Size is not a problem _____________________________________________________________________________________________________________ Weight: Weight is not a problem ----------------------------------------

Asked by Daniel Deacon 6 years ago


How to make a charger for a 4 volt 4.5 ah sla battery? Answered

I have a 4 volt 4.5 ah sealed lead acid battery out of a cordless phone battery backup thing and I have no way to charge it. Does anyone know how to make a charger for it or even at what voltage and amps to charge it at? Thanks.

Asked by JasonYMN 9 years ago


Circuit for electric vehicle? Regenerative braking / free-wheeling?

I'm working on a circuit for an electric trike I plan to build for the local EV challenge competition. I plan to incorporate regenerative "free-wheeling" to recharge the batteries on the down hill sections. S1 closed and S2 open to accelerate the vehicle. S1 open and S2 closed to recharge the batteries while freewheeling down hill. Batteries: sealed lead acid batteries 12V or 24V (depending on motor) Motor: brushed DC motor Would this kind of circuit work? Is it possible to recharge SLA batteries in such a way? Any help and/or suggestions is appreciated. PS. I know it would also be possible to implement regen braking using a full H-bridge, but i think we would be doing more freewheeling than braking on the race track.

Asked by mulan2015 4 years ago


How to charge a series parallel array?

Hi, we are building an ice cream cart with a 36v sound system and a 12v led dance floor. We desire to do a series-parallel with six 7.2Ah SLA batteries, for the 36v amplifier. And run two 7.2Ah SLA batteries in parallel for the lights.  I would love to brainstorm on how I can charge all these sla batteries. Can people help? We already own a cheap car charger 2 and 6 amp setting.  I am leaning toward throwing a switch or a few switches to go between 36 and 12 for the amps batteries. HELP!!! Thanks, Tor

Asked by torclausen 5 years ago


which generator circuit is better/costs less to charge an SLA?? Answered

Which generator circuit is better/costs less to charge an SLA?? please see the three circuits below and vote but if you think you can improve one of them please email me , I will post it and do the leg work.  I am about to retire and my purpose is to at least not pay for the reading lights.. cherrs Thanks for your input Al

Asked by celalboz 8 years ago


How can I rig a 12v sla battery to power an amp and be charged at same time.?

I have a 12v sla battery (the kind from a kids play atv) that I want to use to make a portable mp3 player . I want to be able to use the battery and charge it at the same time if I want. The battery has only a positive wire and a negative wire coming from it. Help!

Asked by hispanickausinpanik 8 years ago


Perfect battery?, deep cycle, SLA, help!?

Hello, I am one of a group of people that has designed a mobile ice cream cart.  https://www.instructables.com/answers/Got-any-cool-ideas-for-our-Arduino-run-LED-dance-f/ We are currently using 6 of those 7.2 sla batteries. They are set up as a 24v system. But its not good. They are hard to charge. And have begun to swell. We want two smallish deep cycle batteries, set on two battery chargers. Does anyone know a good place to purchase such batteries? Say, 25 or 30 A/hr. Are there batteries for trolling motors? How much should we expect to pay? There are also larger SLA batteries, but I just don't think they are meant to be drains so deeply. (we play this thing for 12 hrs at a time) Thanks in advance! Tor

Asked by torclausen 5 years ago


using a lipo charger to charge a SLA? Answered

Hey everyone ! I'm planning to use a lipo charger from my Ebike to charge some scooter SLA batteries. I'm more of a li-po guy and haven't tried charging 3 SLA's in series before. Original lipo was a 10s 8.8Ah 36V (nominal, maxed out at 42V) and had an on board BMS that took a stright 42V input from the charger. the charger for it will deviver 42V @ 2amp and will let current flow until it hits 42V then automatically shuts off. The scooter batteries are 3X 12V 20ah  (six cell I assume?) by all-means, I should be able to wire the three batteries in series, (3 x 14.5V = 43.5V) then my charger should be a direct replacement right? Still need to manually balance them occasionally but for daily use on a 2amp charge should be ok eh?

Asked by Wired_Mist 1 year ago


Simple question, about sla battery's.

Hello I'll jump right in I have 4 12v 15ah battery's in series (48v) going to a controller. i want to add another 12v 15ah battery to bring it to 60v 15ah but I want to be able to switch from 48v too 60v via a press switch. basically I am building a Boost button for my bike, increase voltage increase speed etc  could one of you kind people help me iv got an idea about how it would work but I was hoping someone here with the know how could clarify,  :)  Thanks.  

Asked by rob1cool 3 years ago


What fuse to use or breaker for a 12 volt 5 amp/hour sla battery? Answered

What size fuse would I use for a 12 volt 5 amp/hour sla battery.  Better yet, are there breakers for same battery.  I am wiring an electrical system for a bike.  As the complexity increases I accidently short the battery more often.  

Asked by Noblenutria 7 years ago


If I have wind none stop can I use 100f caps instead of SLA in between my load? Answered

People with petal generator seems to able to use Caps somereason instead of SLAs, is it possible for a wind gen to do the same? use 10f caps as a buffer between loads.. also can I use AA battery bank to power an inverter (300ma 12v)

Asked by celalboz 8 years ago


can I poll the energy from my 25w solar and 12v windgen with a circuit to charge a SLA??

Building a wingen will put out like 125ma and I have a PV panel puts out like 250ma can I combine the two and charge my 12v sla simultaneously? I know Ebay has dual PV  and Wind charge controller but any other circuit to do this ?

Asked by celalboz 8 years ago


Can I charge a 6v SLA battery with a small voltage-regulation circuit based on the LM350 and a 12v SLA?

I know that Lead Acids are pretty tough cookies in the battery world as far as over-voltage and charging goes, but since I lack an electronic engineering education, I would like to make sure I don't blow H2SO4 everywhere.  I would be monitoring the charging to see when the current drops to the low mA's, and would not have the battery on a constant trickle charge for very long.  I just need the cheapest way possible to charge the battery  >. I had been borrowing a bench supply, but had to return it and now have nothing.  *forever alone*

Asked by mojofilta 6 years ago


SLA Battery Charging? Answered

Quick question about charging SLA Batteries, I haven't really dealt with battery charging too much in the past.  I have two 12v 5Ah SLA batteries, in series, and I have built an under/over voltage protection circuit for each of them, but while charging I noticed that testing voltages across each battery, they are different, however, as soon as I remove the charger and test them as is, they have the exact same voltage (+/-0.05 volts, they are very close).  Is this just because the charger is hooked up, or should I be worried at all about that? I am charging them to 14.75 volts each, or would like to, they say they should be charged to 14.5 to 15v right on the front of them.  While charging they both climb, but one climbs faster and stops once the voltmeter reads 15.2v across it.  0.2v over the rated value really doesn't seem to be of major concern, I just find it odd the different voltmeter readings across the batteries are different while the charger is connected and identical when its not.  Does it have something to do with charging them in series?  I did read that you really can't measure batteries while charging, you have to disconnect the charger first, but any insight would be appreciated.

Asked by Electric Spectre1 1 year ago


Solar Circuit Question

Hey everyone, first post here. I am a novice at electronics. I am putting together a solar powered boombox. I have a 30w panel, a 10A charge controller, and a 7Ah SLA battery. I will be using this to run a 12v Lepai amp. Do I need something in my circuit that disconnects the amp when the battery drops below a certain level? I have read the if a SLA battery is completely depleted it will be ruined, is this true? My charge controller only has a spot for solar in and battery out. Should I exchange it for one with a spot to hook the load?

Posted by jmitchell51 4 years ago


I am switching from SLA to NiCad on my e bike. I have a 48v controller, what options do I have? Thanks for having me!

Do I have to have exactly 48v of batts or can I use maybe 2 18v nicads? I was a music major, so when you guys and gals start using formulas to come up with amps, voltage. horsepower it blows me away.  Any information on where I could learn the basics would be appreciated.

Asked by jackdullboy 8 years ago


6v dc./sla. down to 3v dc to power a 1w.Duracell led flashlight that normally runs on 2 aa batteries or 12v to 3v.

This set up is for a bike light, I have access to a 6v sla. batt. that came from a larger flood light that was useless because of the power sucking halogen bulb,approx 15 min. run time.it also has its own charging circuit and a separate circuit for a single led night light.I tried looking up resistor values,but get confused cause i'm getting different answers from different sites ! LOOSING MY MIND ! HELP ! thanks oh..I use the night light circuit to power a red led flashing bike light for the rear.

Asked by robin67 6 years ago


can i use a 110v inverter connected to a 2000w travel converter to get 220v and power a 220v fridge Answered

I might need to do this when there is an electric outage, can we connect an SLA to inverter (110v) to a converter people use when they travel to 220 v countries?

Asked by celalboz 8 years ago


Problem constructing a solar powered waterfall, please help? Answered

Hello, I have constructed a waterfall in my garden. It consists of a small dc pump which consumes 0.35a at 12v and a bigger pump which consumes 0.87a at 12v and a 5050smd led strip encased in a tube to make it waterproof, which consumes 3.7a at 12v totally 4.9a at 12v. I have a solar panel with 12v 30w and a solar charge controller with 12v 6 a capacity and a sla battery 2v 7ah capacity. I calculated a runtime of 1.4 hours when all three devices are connected together. But they last for only 30 seconds and then the charge controlled shuts them down with low battery indicator. I don't know what went wrong, can someone please help?

Asked by himtec 5 years ago


Spot welding 1.5V battery tabs Answered

I'm trying to spot weld battery tabs for rebuilding a Nicad battery.  I'm using a 12 volt SLA battery for power.  When I touch the leads they get so hot they burn the tabs, but the weld doesn't penetrate the battery.  What am I doing wrong?

Asked by johnnytombstone 8 years ago


Charging multiple 12v batteries

I have eight 12v 18Ah SLA batteries that I need to wire to get 48v. I need to be able to charge them all at once, but can't find a 48v charger anywhere. Is there a way I can wire a 12v charger to parallel charge the batteries while they're wired in series?

Asked by Charlie_Szasz 1 year ago


how do i use a savonius wind turbine made from 200w electric scooter motor to charge 12v sla battery?

 the turbine is to charge a battery the battery will the run 2 12v caravan lights in a hut in the woods I am not electronically minded so you need to put the answer into laymans terms please many thanks 

Asked by venator 8 years ago


Does a 600w invertor draws more current even w/out using full capacity? Answered

IS it better to buy a lower Watt version if we are not going to use full capacity to conserve battery? SLA 7amp, 600w 110v inverter with a 9w light load = operation time? is it better to charge a netbook with a cigarette adapter say 9v VS an inverter and Netbooks Brick?

Asked by celalboz 8 years ago


Coleman car Jumpstarter charger wallmart voltage ? Answered

I have the circuit out of one of these , I see that it can charge a 12v 7.5 amp sla, what is the voltage of ne of these that wallmart connects to the charging circuit model PMJ8160 Coleman thanks, if no reply I will try a 12v 500 ma wallmart as this curcuit has a lm324n which boosts voltage to i think 13.5 etc. thanks all.

Asked by celalboz 4 years ago



How do I charge two marine cycle batteries at 24v? Answered

Hello, I've built a mobile stereo ice cream cart that I have posted here on instructables. https://www.instructables.com/answers/Got-any-cool-ideas-for-our-Arduino-run-LED-dance-f/ We've been having a hard time with our SLA batteries. We have two 12v banks of three 7.2 sla batteries, run in series to make 24v. (six batteries total) We then use a car charger on trickle to charge the two banks separately. This is a pain, and the cells have been swelling. We desire a bit more battery life. (currently at about 6 hours) and simpler charging. My thought is two small marine cycle batteries (maybe 40 Amp/hrs each) and some sort of 24 volt charger. Would this work? Is there a better way to go?  Extra Points for Light, Cheap and Simple. Thanks so much! Tor BTW totally open to a battery lecture, or to get pointed to a good read. I feel like I need to get schooled.

Asked by torclausen 5 years ago


help on designing a 12v UPS? Answered

We have a problem with kids coming into our garden, vandalising our plants, breaking into our shed etc. we have decided that installing a cctv system in our home is a good idea as even if it doesn't stop them coming in, it will be solid evidence to take to their parents. problem is, we have regular power cuts and i would like the cctv to be recording 24/7/365 (especially in the shed because that is where our bikes get stored) i have two 12v 7ah SLA batteries that i am donating to the project, iknow that they need 13.8v and around 500ma to charge. i need 16 camera outputs, and then a couple of spare outputs for aux devices (router to keep it connected to the internet, mics, infra red lamps etc) the dvr its self wants 12v 5 amps input so i think for that i will make another psu just for that with maybe 2 or 3 12v 7ah sla batteries. i have baisic electronics knowledge, have access to pcb printing facilities and can use eagle. any help at all would be amazing, the main things i need to know is: how to get 13.8v from 240v ac, how to power all the cameras from 240v ac and have a smooth switchover from mains to battery. thanks in advance - luke

Asked by ljarrald1 7 years ago


How to hook up 2 batteries in parallel ?

I'm building a portable MP3 "boom box". I have two 12 V SLA batteries on hand, one is 12 V 4 AH and the other is 12 V 7 AH capacity. My question is: can these 2 batteries be connected, in parallel to power the amplifier I have ( 12 V) and 1) it would give me a ~ 11 AH battery? 2) could I charge them both, ( connected like that ) with a 12 V battery charger ( a automotive battery trickle charger) I have at hand?

Asked by Phoghat 6 years ago