Questions tagged [battery]

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2 votes
4 answers
104 views

Can an inverter be supplied by a battery with lower AH than required for designed VA?

I'm looking to provide backup power to a home CCTV system. The PoE switch has a maximum rated dissipation of 78W. Each camera draws a peak of 7W. Since each camera is powered by the PoE, I assume the ...
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  • 331
0 votes
1 answer
43 views

Deep cycle marine battery for Zoeller sump pump - how often to replace?

I have a Zoeller sump pump with a deep cycle battery. How long do these deep cycle marine batteries last and need to be replaced?
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12 votes
4 answers
4k views

I turned a breaker off, and now the security alarm system won’t stop beeping

I turned off a breaker for about an hour. I then heard a low beeping noise, not the full-blown alarm siren. I turned the breaker back on, but the beeping persisted. We called the alarm company. They ...
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-1 votes
1 answer
78 views

Rewiring charger plug

I've got a mains charger for some battery powered clippers which had has the cable cut clean through. It's not a standard charger fitting, so I'm keen to repair it. The cable consists of two wires, ...
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0 votes
1 answer
169 views

Deep cycle battery amp hour confusion

I just got a group 29 duralast marine deep cycle battery from auto zone. The group 29 is the first link below. I got it home and looked online and found that the group 29 battery weighs 10 pounds more ...
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0 votes
0 answers
56 views

How to connect a whole-house battery?

I've been curious about installing a small home battery (4 - 7 kWh) to take advantage of time-of-use (TOU) billing. The idea is that the battery charges from the grid off-peak and then the home ...
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  • 249
0 votes
2 answers
110 views

Suggestions for connecting a small UPC (battery backup) to a single receptacle/outlet that will power a wifi mesh router

tl:dr What is a safe way to connect a simple plug-in UPC battery back-up so that it can power a single receptacle on another side of a wall? We have an older farm house that has been expanded a few ...
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  • 105
0 votes
1 answer
86 views

Is there any downside I need to know when I add new solar panels to existing ones?

I currently have about 12 LG solar panels installed on my roof. They only produce about 3kwh at peak sunlight condition even though they are nominally a 4kwh system. It is because of my house's ...
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17 votes
1 answer
2k views

FirstAlert smoke detector low battery warning continues after opening battery drawer and replacing batteries

Note: I'm creating and immediately answering my own question because I wasn't able to find documentation of this solution online. My condo is equipped with a FirstAlert 7010BSL smoke detector (...
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-1 votes
1 answer
84 views

Excess inverter noise, low voltage

I'm not entirely sure if this is the best place to put this, but I'm having an issue with a mega-battery I'm working on. The battery is two AGM 12v batteries in parallel, with an inverter stepping up ...
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  • 554
-1 votes
2 answers
95 views

How to force alarm clock to have the screen always on [closed]

I have an alarm clock, that has batteries and a power cord as a power source. If it's using batteries, it turns the screen off after a few seconds. If it's plugged in, then the screen is on ...
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2 votes
6 answers
2k views

Multiple small AH batteries vs one large battery [closed]

I finally am making the switch to battery tools. Looking to buy some kits and bare tools as well. I have the option of getting two 1.5AH batteries or a single 2AH battery. In theory this should be ...
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  • 129
1 vote
1 answer
33 views

How to turn a Nest or Nest-E thermostat to completely off (no power, no battery)?

Is it possible to remove the battery, or otherwise turn a Nest thermostat completely off, for times when there is no power to the furnace? This is to avoid draining the battery in the Nest completely,...
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  • 10.3k
-1 votes
1 answer
42 views

Install battery on honda generator?

I have a Honda generator and I want to install the battery. Somebody else took the old battery out, so I don’t how they did that. The problem is that I only see a gray cable, a black cable, and a ...
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  • 1,817
5 votes
11 answers
2k views

How to make a cap to cover the battery terminals of Ryobi batteries?

Ryobi batteries have a protruding part with battery terminals on it. Here's an example of what the battery looks like. I'm worried that if the battery is stored in a carrying bag with lots of metallic ...
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  • 227
0 votes
1 answer
73 views

Electrical Back-up Solution

I have a 350 Watt appliance that I need to run pretty much continuously. An electrical outage of a few seconds isn't a problem but more than a minute or two becomes an issue. So I need a back-up ...
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  • 3
0 votes
1 answer
133 views

Same Bosch batteries, but one battery only works in one tool, what can I do?

So, I have some BAT612 18V batteries from Bosch. I should be able to use both batteries with either of my tools (Angle Grinder - GWS18V-45PC, Drill - DDS181A), but one battery works in both tools and ...
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0 votes
4 answers
835 views

Use a 24V LifePo battery in a UPS designed for lead acid batteries?

I have an existing APC 1500 UPS, designed for use with 24v lead acid batteries and want to know if it would be possible to replace my dead lead acid battery with a 24V Lithium Iron Phosphate (LFP) ...
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0 votes
1 answer
63 views

Direction of electron in car circuit [closed]

I read this somewhere. "Electrons flow from Negative to Positive. This is called Electron flow. Originally it was believed they flowed from Positive to Negative. This was later found to be ...
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0 votes
1 answer
142 views

Is it possible to make an "energy harvester" that drains old batteries? [closed]

I am currently looking at my stack of old batteries at home, did some measurements and found that most of them contain at least some energy left. I was then thinking. What is I could make a device ...
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  • 171
1 vote
0 answers
138 views

Rocker switch panel wiring

I am looking to wire a boat rocker switch panel to a 12 volt deep cycle battery for my canoe. I have three switched on the rocker switch panel. One will be for navigation lights, one will be for a ...
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0 votes
2 answers
238 views

Powering battery powered tools from the power grid

I have a number of Ryobi One+ tools that have enough power and quality for me in most cases. They all share the same 18V battery form factor which means that I can invest in 2-3 batteries and use them ...
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  • 109
1 vote
1 answer
459 views

Solar Charge Controller and grounding the battery

I am just getting my feet wet, so I have one 100 watt panel and a 12v marine battery. I plan on running a small water pump to circulate water in a black hose to see if I can heat some water. The ...
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4 votes
2 answers
466 views

How to change battery in garage door keypad?

One of the keys on the keypad for my garage door somehow got a key stuck temporarily and drained the battery. That was easily fixed, but now I am trying to replace the battery. The pictogram seems ...
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  • 547
-2 votes
1 answer
69 views

Are the norms for cordless screwdriver charging stations?

So I found this cordless screwdriver at my house but there is no charger for it so I would like to buy a used one for it (it's very cheap so I also don't want to spend a lot of money to buy a new one)....
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2 votes
0 answers
56 views

"Non-Retail" House Battery

I need a ~3.5kw battery to power an emergency circuit if the power goes down. I've been quoted $13,000 to add an LG Chem 9kw to our existing system but that does not include the inverter upgrade. ...
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  • 189
0 votes
1 answer
57 views

Is there a product that allows me to run a "mains" device off a power tool Battery [closed]

I have some fairly large DeWalt 18V batteries, which run, e.g. my Cordless LawnMower. I imagine that they'd also run my Corded tools, at least for a while, if I could connect them up. But I can't find ...
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  • 524
0 votes
2 answers
49 views

What batteries are available for powering outdoor LED lights?

I'm trying to build one of these myself (TLDR; It's a lighting setup for outdoor usage to illuminate a pingpong table). I would like to know what sort of batteries are available that might help me ...
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0 votes
1 answer
72 views

Trying to make a 3AA battery case [closed]

I have requirement to create a device which works on 3AA battery and uses a small enclosure. When all the items are put inside the enclosure, only about 31x31x60 space is left. So all the readily ...
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  • 101
1 vote
2 answers
176 views

Can I connect a normal 12 Volt 150AH C10 battery with a solar 12 volt 150AH C20 battery in series for my 24Volt solar system

I have an Exide invamaster 1500imst short tubeler normal battery of 12 volt, 150AH, C10. Now I want to connect this battery with a solar battery of 12 volt, 150AH, C20. Can I connect this normal 12 ...
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0 votes
1 answer
166 views

Unplugged alarm panel - battery died - keypad says low battery

I have a honeywell alarm panel that I believe trickle charges a 12v 4ah casil lead-acid battery. The panel and battery are ~2 years old. It was unplugged while doing a drywall repair and the battery ...
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0 votes
1 answer
162 views

Prototype: 12 DC car battery to power standard 120 VAC hand tools

Objective: Today I power my tools (drill, circular-saw, reciprocal saw etc.) in my shed by running a power line from my house. I wish to install solar power panels on my shed; however, before I do ...
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  • 185
2 votes
2 answers
232 views

Battery bank in parallel/series or series/parallel

I'm trying to help some friends who live in a remote village in Africa to get the best out of their solar installation, and I'm trying to understand whether there's an optimal way of hooking up the ...
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  • 21
0 votes
2 answers
253 views

Spark/Arc observing while connecting battery to charge controller [closed]

I have the solar system as shown in below diagram. When I connect my battery terminals to the MPPT charge controller, I am observing an arc immediately and due to which I am afraid to connect. Does ...
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1 vote
3 answers
2k views

Battery Backup for 240V (USA) Water Well

I have a well pump. I want to build out a battery backup (and, eventually, charge the batteries with solar and, more eventually, move to solar full time). It's 1/2 horsepower on a 240v circuit. It's a ...
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0 votes
3 answers
5k views

Why do well pumps need 240V when the wattage is not that high?

I want to be able to power my well pump from a battery when the power goes out, but I am learning that well pumps are heavy duty, running at 240V high voltage, even though mine is only 3/4 hp, which ...
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1 vote
1 answer
66 views

What's the difference between XX Volt and XX Volt MAX on rechargeable lithium ion batteries?

I was looking at battery power tools and their different battery voltages. Some of the voltages are listed twice, with and without "max". An example for mowers is "40-volt" and &...
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  • 111
0 votes
2 answers
721 views

Can I configure home battery power like a UPS - where it constantly self charges and auto transfers?

A simple UPS (uninterruptible power supply - like APC, cyberpower, etc.) will charge itself while simultaneously powering the loads on the other side. If utility power is cut, the batteries will ...
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0 votes
1 answer
45 views

Bsmnt Watch Dog Battery Flashing "Add Water" but the water level is to the line

I have Basement Watch Dog Special. The "Add Distilled Water" alarm keeps coming on. The water level is to the line and the probe is submerged. I measured the specific gravity of each cell:...
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0 votes
2 answers
446 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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0 votes
2 answers
127 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 ...
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  • 101
2 votes
3 answers
258 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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0 votes
1 answer
71 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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0 votes
2 answers
101 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 ...
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2 votes
1 answer
2k 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 ...
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  • 315
2 votes
3 answers
1k 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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  • 217
-1 votes
3 answers
682 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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  • 1
1 vote
1 answer
127 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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  • 285
1 vote
2 answers
26k 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 ...
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  • 11
2 votes
2 answers
340 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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