All Questions
16
questions
2
votes
0
answers
40
views
2 xLM324N lead battery charger fail. Images added
i have a Lead Acid battery charger that was given to me since its not working.
I have no 12volts output neither any led on.
Schematics do not appear after hours of google search
So far ive tested ...
- 29
0
votes
0
answers
62
views
12V boat lead acid battery suddenly failed
Battery on boat and powered by solar panels started acting really weird suddenly exactly a week ago. App shows voltage went from minimum 12.3V to min 6V in a day. On board voltmeter showing 11.9-12.2 ...
0
votes
4
answers
8k
views
Is it acceptable to connect a car battery and an AGM battery in parallel?
I power a 12V fridge in my car either via the car battery (when the vehicle is running) or via an AGM battery. There is an Anderson outlet in the car connected to the car battery to which I attach a 3 ...
- 185
0
votes
2
answers
163
views
How to regulate voltage from marine battery? [closed]
I have a telescope with a number of components that run on 12vdc.
I want to create some sort of power regulator to supply power to my components without frying anything. Is there some kind of voltage ...
- 133
1
vote
1
answer
252
views
Replacing a 12 V, 19 Ah lead-acid battery with a 12 V LiFePO4 battery
I have a Stanley PPRH7DS battery charger that came originally with a 12 V, 19 Ah lead-acid battery. This battery has since given up the ghost and I am looking to replace it.
Last summer I constructed ...
- 11
0
votes
2
answers
799
views
Can I wire a 12V car battery to the 12v cigeratte lighter plug?
I have a van for summer travel and I am considering wiring up a car battery directly off of a 12V cigarette port which is rated at 20A by the car company. If both batteries were well charged at the ...
- 949
0
votes
2
answers
2k
views
Overcharge a sealed 12V lead-silver-calcium battery with a power supply to prevent sulphatation
I read that lead silver calcium battery need 14.8 V to fully charge. The max with my charger (ctek) is AGM setting which is 14.7 Volt. I fear this lower voltage this will lead to sulphatation of the ...
- 1
2
votes
3
answers
296
views
Robust low battery cutoff
I am building a 5V DC charger for an offroad motorbike. The main goal is to use this to charge/power a mobile device/phone/tablet whilst travelling/camping.
If space allows maybe also a GPS tracker ...
- 21
0
votes
2
answers
145
views
Will a 4 Ah 12 V battery be fine for a 2 A 12 V diaphragm pump + a Raspberry Pi?
I've got a 4 Ah 12 V lead acid battery which currently runs a Raspberry PI. I'd like to connect a diaphragm pump to this battery as well. The pump has a max. rating of 2 A.
Assuming a fully charged ...
- 646
2
votes
2
answers
6k
views
What is the lowest voltage a 12V lead-acid battery in a car could be?
I'm trying to design a product that is powered from the 12V rail inside the car. In normal driving (engine running, electronics on etc.), what would be the minimum voltage of a low battery?
Reading ...
- 279
0
votes
2
answers
457
views
Is my 12v lead acid battery 100% dead?
so I got a ups with a 12v lead acid battery that was constantly on so the water inside the cells has disappeared, initially the reading voltage was 0.3v, and when I added distilled water it generally ...
- 111
0
votes
2
answers
831
views
How much input voltage is required to get 12V from an LM2596?
I am trying to run a WiFi router from a 12V lead acid UPS battery.
To get a stable 12V output from the battery I used an LM2596.
The problem is that the output is always 8.28V-8.50V. No matter how ...
- 3
1
vote
0
answers
371
views
Help needed with over discharge circuit on LifePo4 12V car battery replacement
I'm putting together a LifePo4 battery pack with the intention of replacing the 12V lead acid battery in my 4WD.
So far, what I've got is the following.
4 x 10 Ah LifePo4 batteries (38120 Headway) in ...
-5
votes
1
answer
1k
views
How to protect a 12v lead acid battery from a short circuit?
Is there a board that protects lead acid batteries from a short circuit. The capacity of my battery is 4,7Ah. My circuit is consuming about 3 amps.
- 67
1
vote
1
answer
62
views
Hi-voltage required for 100% SoC in LA banks?
Talking large banks of expensive true-deep-cycle cells, not the stuff you see in mass retail channels. Maybe the 6v golf cart batts from Sam's, at the "value" low end.
I think end-of-life ratings are ...
- 240