Questions tagged [battery]

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1answer
57 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 ...
0
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2answers
103 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 ...
2
votes
2answers
80 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 ...
4
votes
1answer
54 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 ...
0
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3answers
1k 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 ...
-2
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1answer
63 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)....
0
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1answer
2k 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 ...
2
votes
0answers
46 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. ...
1
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1answer
3k views

Wiring a Tesla Powerwall into an Existing Solar Install

I've been looking at the cost and feasibility of augmenting my existing 5kWh solar install with battery-backed storage to shift usage of the solar power that I generate to more useful times of the day/...
0
votes
1answer
43 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 ...
0
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2answers
27 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 ...
0
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1answer
66 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 ...
1
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2answers
36 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 ...
0
votes
1answer
30 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 ...
0
votes
1answer
67 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 ...
0
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2answers
61 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 ...
1
vote
3answers
358 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 ...
1
vote
1answer
42 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 &...
1
vote
1answer
234 views

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

I have four 355W solar panels and three 315W solar panels. I have a 40-amp mppt and a 30-amp mppt charge controller with 100V Max PV voltage. The distance solar panels to charge controllers is around ...
0
votes
2answers
137 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 ...
0
votes
1answer
33 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:...
0
votes
2answers
101 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.
2
votes
6answers
24k views

Replacing battery in backup sump pump

I have a PHCC 2400 battery backup sump pump. It started beeping today and the controller light indicated that the battery terminals were corroded or that the battery was bad. I opened up the case ...
12
votes
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 ...
0
votes
2answers
69 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 ...
0
votes
2answers
76 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
votes
3answers
120 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 ...
0
votes
1answer
46 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 ...
2
votes
1answer
1k 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
votes
3answers
317 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 ...
-1
votes
3answers
202 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 ...
1
vote
1answer
95 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 ...
1
vote
2answers
6k 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
votes
2answers
161 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 ...
5
votes
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 ...
0
votes
3answers
1k 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 ...
1
vote
1answer
146 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 ...
2
votes
2answers
499 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 ...
0
votes
2answers
61 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 ...
1
vote
4answers
372 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....
2
votes
3answers
2k views

How can i set up a Solar Panel to charge a 12v DC car battery and power a Raspberry Pi?

I've pulled together a few spare parts that i've had laying about for ages now and I finally have a bit of time to try do something with them. I've got a solar panel which puts out ~22vDC @ ~2Amps ...
0
votes
1answer
61 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
959 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, ...
0
votes
3answers
134 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
votes
1answer
117 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
2k 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
146 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 ...
0
votes
2answers
97 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
votes
1answer
45 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 ...
1
vote
2answers
1k 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.