Questions tagged [battery]

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votes
2answers
39 views

How do I improve specific gravity in a 4 year old battery

The specific gravity indicates almost nonexistent acid level. Barely above water. What is the best way to bring this battery back to life. It is a 6 volt solar battery.
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2answers
61 views

System to charge 24V lead-acid battery from a 12V lead-acid battery [closed]

Our garage has no mains connection, but it does have a 12V leisure battery charged from a solar panel, connected to an inverter to produce 240V AC. That mainly gets used for charging a mobility ...
2
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3answers
55 views

How can I lift the latch of the battery compartment in this smoke alarm detector?

First of all, I'm a bit embarrassed I cannot figure this out myself. I have looked up Youtube videos, Google searched but I didn't find any exact video. Plus I have tried pressing it hard, lifting ...
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1answer
36 views

Should I wait for my inverter alarm to know when my battery is discharging beyond safe level or should I shut down the loads sooner?

I am using a flooded deep cycle lead acid 24v 450ah battery bank. I don't want to discharge them beyond safe levels so they can last longer. I don't know how to check the state of charge. I have a ...
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2answers
66 views

Will it damage my batteries?

I have two solar arrays which totals close to 2 kw that I use to charge a 24 v 450 amps flooded lead-acid battery bank using 2 mppt charge controller of 30 and 40 amps. Will it damage the battery by ...
2
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1answer
157 views

Battery backup system for tankless gas water heater (outdoor install)

I have a Takagi T-K3-SP tankless gas water heater, which is installed outdoors. It still needs electricity though, so when I lose power at home, there's no hot water. The manual states it uses 86W ...
2
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3answers
95 views

Do tool cross-manufacturer battery adapters work without damaging battery or tool?

I'm talking about something like this which allows you to use a Dewalt battery in a Makita tool. Since this is just a question of connecting pins and so on, and no change of current or voltage is ...
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3answers
91 views

12v light amperage

Say i have a 12v light bulb that is 40 watts that can hook directly to 12v battery. I want to know if hooking it directly to the battery uses more amperage than if i were to hook my power inverter to ...
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1answer
85 views

What can I use redundant/spare AGM batteries for?

In my off-grid cabin I currently have a single 258 Ah (C24) Concorde PVX-2580L battery, with a 150 Ah spare (and generator) for backup situations where the main runs flat. As I frequently see the ...
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2answers
908 views

Something is beeping in my house intermittently. It is not the smoke or carbon monoxide detectors! [duplicate]

We are having a very infrequent beep occur in the house. It lasts about one second and then stops for a long time, about once an hour or so. I can't tell what direction it is coming from but we have ...
2
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2answers
111 views

Options for Running High End Computer on Old Circuit

I'm preparing to build the computer of my dreams. Unfortunately, it's going to top out at 1350 Watts when running at peak performance. I live in an 80 year old bungalow and the power situation is less ...
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5answers
2k views

Sump pump automated battery backup

I have 1/3 horsepower sump pump currently plugged into my home's 120 volt outlet. I have a 105 amp hour 12-volt battery and a 1200 watt pure sine inverter ready to go when the power goes out. The ...
1
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1answer
73 views

Proper amount of solar panels needed to charge batteries

I am working on a plan for a 24V electrical system. Based on my needs I plan to have six 12V 100Ah LiFePO4 batteries wired up (2S3P I believe) to give me 24V 300Ah. Assuming I need to fully recharge ...
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2answers
56 views

Portable battery using this adaptor spec

What is this battery pack inserted here at bottom? I have this adaptor powering a 5V equipment. I need a portable battery. What is the most reliable one that can produce 4A, 20W? I can't take ...
12
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8answers
4k views

Easy way of generating a 50-150W load @12V

I need to test a battery for its remaining capacity and to do that, I need to generate a constant load to be able to measure how long it can sustain that load. I tried using a 330W load (290W shoe ...
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4answers
157 views

Sizing up a battery bank for max continuous power draw

EDIT: on hold while I check conditions @Harper pointed to the fact that my battery is rated to draw 165A continuously for an hour, which should cover the needs of my inverter when my vacuum starts up....
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1answer
129 views

How should I connect my solar panels to each controllers for optimal performance (series or parallel) without buying new charge controlllers?

I have 4 355w solar panels and 3 315 w solar panels. I have a 40 amp mppt and a 30 amp mppt charge controllers with 100v Max pv voltage. The distance solar panels to charge controllers is around 15 ...
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1answer
53 views

Calculating Battery Size for 2 Channel NVR Security Camera System

I need to install a security camera system on a United States 110v power circuit that is only on a night. The circuit is using an astronomical clock to turn on power and more accurately measure the ...
2
votes
3answers
560 views

Inverter Power draw from 12V battery

Given a 12V, 100A battery with a 1000w inverter, how many amps would a generic standard european 220V, 500W appliance draw per hour from the battery itself? I know wattage equals volts times amps, ...
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3answers
110 views

How big of a Battery Backup or powerwall do i need to power 3 medical devices

I have two CPAP's and one Oxygen concentrator. I would like to power when the power goes out. The sticker on the oxygen machine says 3.4 A. The CPAP's are identical ,models and the stickers on the ...
0
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1answer
81 views

Estimate ROI of installing battery pack like the Powerwall

The power company charges more for power during peak hours than at night. In theory, a wall-mounted battery like the Powerwall or several competitors could help mitigate this by drawing power when it ...
2
votes
1answer
348 views

How can I figure out cordless drill terminal polarities?

I just got this Black and Decker SS18 drill and wanted to run it with my existing batteries but the drill has no polarity markings. Anyway to figure out which terminal is which?
3
votes
1answer
90 views

How can I fix this handheld vacuum cleaner?

This is a handheld vacuum cleaner with a simple circuit inside. I’ve charged it fully for a good while and also tried decharge-recharging it but no joy. All it can manage to do is ticking the engine ...
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2answers
71 views

How to replace a watch battery? [closed]

I'm trying to replace the battery of my watch, but I can't work out how to take off the back cover, to get to the battery? (see photo) I've Googled on how to remove the back cover of watches, but it ...
0
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1answer
44 views

Switching drill batteries [closed]

I have a Porter-Cable 20 volt impact drill and circular saw... I just came across to 6 amp hour Milwaukee M18 batteries for free... I want to run my Porter-Cable impact off the M18 battery how do I ...
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2answers
385 views

How can I make my home internet router work with a battery?

I have an ZTE zxhn h108n router, which needs an 12 V input. I want to make it work when the electricity goes off.
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2answers
48 views

How to complete this circuit

I got some decorative multi color led wire. It is broken at one place now. I need to connect the wire to complete the circuit. I am new to this and I am trying to learn. I tried twisting the wire so ...
1
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1answer
1k views

Is use of a deep cycle marine battery indoors safe?

I have a backup sump pump, a 12V "Basement Watchdog". However, immediately after installing it, I found the battery was basically dead. Not wanting to buy a very expensive replacement battery, I got ...
2
votes
3answers
345 views

Is it safe to use a battery charger to test the capacity of a non-rechargeable battery?

I have this battery charger at home. It has a voltage test function. I also have a lot of non-rechargeable batteries lying around. Is it possible and safe to use the charger's test function on non-...
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1answer
40 views

Temperature Sensor with Current Sensor

I have SMA - Sunny Island inverter, the one that is use in Off-Grid Solar PV System. I am getting error because there is no Battery Temperature Sensor connected. I have a plan on buying the ...
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0answers
210 views

Porter Cable NiCd 18V batteries - Lithium replacements?

Does anyone here have any experience with these tools and battery options? What about chargers? I understand the need for a different charger; my specific question is whether anyone has experience ...
2
votes
2answers
340 views

“power buffer” in front of generator for peak power shaving?

I need to do some work off-grid, and I only have a 1000W generator to drive my power tools, which easily draws twice that (and probably more when starting up) when cutting steel. Instead of getting a ...
1
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0answers
56 views

i'm having trouble with battery not charging

I think I have a battery going bad. Charged over nite and light read charged. but in the first 15 mins it died on me how long does it take to charge a hitachi battery 18v
2
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4answers
178 views

How to mitigate voltage drop?

I currently have a sump pump in my basement that is normally powered by plugging it into an outlet. When we lose power, I have a 100 amp hour marine deep cycle lead acid battery along with a 1200 watt ...
0
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3answers
973 views

Sump pump battery backup

I currently have a sump pump in my basement. I recently lost power during a rain storm and had to pump water out by hand until power was restored so I am looking to install a battery backup for the ...
0
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2answers
85 views

Where to get solid aluminum “battery” replacement cylinders? [closed]

I once saw an ingenious setup while doing work for a state agency. A contractor created a "black box" that contained a Canon camera in it for photographs that normally needed batteries in both it and ...
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0answers
35 views

Battery terminal in wireless light switch corroded

I have a wireless light switch in my garage which uses 4 triple-A batteries. When the switch quit working recently, I took off the cover to replace the batteries and saw that the terminals were all ...
0
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1answer
80 views

Storing energy from small wind generator to power led garden lights

I want to create a small wind generator using a bike generator (se picture) to power some led garden lights during the night. I have so far created a 1m in diamater wood propeller and a rotating ...
0
votes
1answer
74 views

Looking for combination of temperature sensor and thermostat - any hints?

After reading a lot, I am still very confused... Maybe you could give me some hint? I am looking for: a temperature sensor in my room a thermostat on my radiator It is important to me that these ...
0
votes
1answer
249 views

Opening and closing solenoid deadbolt with key

I am starting a project to implement a "smart" lock for my door using Arduino nano, a solenoid deadbolt and a fingerprint reader. Which on its own works fine, but the whole project will run on a ...
1
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0answers
35 views

Using excess energy during float phase - am I using up my batteries' cycle life?

I have a hybrid power system: 3kW solar; 2kW wind turbine; 1kW water wheel, that feed a 48v (flooded lead acid) battery bank. Presently, after absorption charging is complete and the system goes into ...
1
vote
1answer
63 views

Would a single section of 3 LED's from a LED strip still need the required 12V?

I have some LED strips which run off a 12V power brick, but what I don't know if that applies to even a single section which is only 3 LED's? I was basically wondering if there was a way I could cut ...
2
votes
1answer
661 views

Charging a battery with a solar panel

I want to light a cabin. I have the following: 75w 12V Coleman solar panel (two bare wire ends) Large car battery from a Jeep Even larger (boat?) battery - an Optima Yellowtop 34/78 50/10/2A 12V ...
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4answers
208 views

Is Having Multiple Charge Controllers on a single 48V System/Battery Bank a “Bad Idea”?

I have a 48-volt renewable energy power system in my house that is presently off-grid. It has: - a 6kVA inverter/charger that can connect to a generator or the grid (charge controller #1) - a 2kVA ...
3
votes
1answer
198 views

Offgrid L14-30 connector to solar generator

I have a small off-grid cabin in the woods that I recently purchased. The previous owner had a L14-30 generator connector installed on the outside of the cabin and wired it with normal 120v outlets 4 ...
0
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1answer
154 views

I soldered 2 AAA batteries together in series but am not getting double voltage [closed]

I'm sure this is rudimentary, but I'm very inexperienced in anything practical with electronics. Would like to try to get a 3volt battery go run some LEDs. I thought I could just take two AAA ...
0
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2answers
240 views

recharging 18V battery back in parallel

So I'm working on a project where I'm wanting to take several 18V ryobi battery packs, put them in parallel to increase the capacity, and then use that to power my project. I think this should be ...
1
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1answer
1k views

Can I connect a battery reserve to my solar attic fan?

I have recently purchased a solar powered gable fan for my attic. This fan will only work when the sun is up, but I would like a little more out of it during the early evening hours (no sun). Is ...
1
vote
1answer
125 views

Making a Solar Power Battery Backup Unit

Ok, so this is a small battery backup unit. I want to just start small and see if I can get the idea working. I'll buy this 20 watt solar panel with charge control http://www.amazon.com/20W-12V-...
0
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1answer
199 views

Does a leaking cell destroy the other cells in the same battery?

I have a device I have never used before. Unfortunately I found out that one of the device's 3 LR44 cells was leaking white potassium carbonate. See my sketchy illustration below. I have only 2 new ...