Tagged Questions

0
votes
1answer
35 views

Two 6v batteries in series charged by two separate solar panels

I have two solar panels - first 30 watt 2 amps second 40 watts 2.3 amps, and two 6v deep cycle batteries in series on my RV. My question is: can I simply use two separate charge controllers (max 7 ...
0
votes
2answers
34 views

Cell phone battery with solar shield, arduino [closed]

I was looking for your opinion on this product: http://www.seeedstudio.com/wiki/Solar_Charger_Shield_v2.0b Do you think I could use a cell phone battery (3.7v 1000mA) with this? I have a standard ...
0
votes
0answers
43 views

What is a good Solar panel for a 12 volt 10 amp hour lead-acid battery

I want to be able to charge a 10 amp-hour lead-acid battery with a solar panel for when I am away from a power source (camping etc.) I don't want the battery to take longer than a daylights time to ...
0
votes
1answer
81 views

How to power a remote control car using solar power

My daughter is trying to power a remote control car that currently uses 4 AA batteries as power. She is trying to convert it to solar. What does she need to do so?
0
votes
1answer
148 views

Charging iPhone via AAA battery [closed]

I have a trip in near future, I have a hub dynamo fit to my bicycle which has 6.0 V DC output of 3 Watts power. I have read few posts and realized that it is risky to charge my iPhone directly through ...
0
votes
1answer
146 views

Charging phones via solar battery chargers

For a school project, I want to make a solar iPhone charger (specifically for the iPhone 4) and I've spent about a week looking up stuff all over the Internet, and I'm stuck for the hundredth time. ...
1
vote
1answer
262 views

Can you damage an iPhone by charging it using a (homemade) solar panel?

I found a guide online that shows how to make a solar phone charger (in a bottle), and I thought I'd try it out, but I'm worried about damaging my iPhone 4 (for a school project). (If anyone's ...
0
votes
0answers
85 views

What Solenoid type should be used when attempting to power with a battery/solar power source?

I am building yet another home irrigation system driven by my raspberry pi. I am using a transistor switching circuit like one linked in Solenoid Electrical Characteristics to switch a 12VDC solenoid ...
4
votes
3answers
3k views

Battery Backup: C10 vs C20

I am installing a home UPS system of 1400 VA. The UPS is a 24 volt system and, based on the batteries available on the market for the UPS segment here, will need 2 x 12 volt batteries for it. Based ...
0
votes
0answers
47 views

Parts List to Replace Battery Packs?

I've purchased and installed some relatively cheap motorized blinds for my apartment. After having them for about a month, the batteries are dead on 2 out of 3 sets. Each blind has a pack of 7 AA ...
3
votes
1answer
198 views

How to feed laptop + bulb with solar energy?

I reside in Kathmandu where the current power supply is so weak one has to face between 8 to 18 h power cut per day. In order to work, I need to have continuous supply of energy for my laptop and a ...
0
votes
1answer
210 views

Can I recharge 12V batteries individually while why are attached in series? [duplicate]

Possible Duplicate: Charging two lead-acid batteries connected in series, separately (with two solar panels) I have 12V Solar Panels and 12V batteries. But my laptop needs 17V to recharge. ...
3
votes
2answers
936 views

Powering 10watt light bulb for 24 hours using solar power

I am a total noobi to solar power and even electricity so I appologies if I am asking a silly question. Imagine I have a 10watt light bulb which I want to leave on for 24 hours a day. Will I just ...
1
vote
4answers
407 views

Charging two lead-acid batteries connected in series, separately (with one solar panel)

I have 2 sets of 2 lead-acid batteries connected in series to produce 48V. They are powering an audio amplifier. I'd like to be able to charge them with ONE solar panel. If I connect the output of ...
3
votes
1answer
1k views

Smart charging circuit for NiMH battery pack

I want to build a solar powered charger for a niMh battery pack to run a microcontroller. What are the fundamentals of building a smart circuit that will not overcharge the battery and will also allow ...
5
votes
1answer
355 views

Charging two lead-acid batteries connected in series, separately (with two solar panels)

I have two lead-acid batteries connected in series to produce 24V. They are powering an audio amplifier. I'd like to be able to charge them while they are powering the amplifier, with solar panels. ...
2
votes
2answers
351 views

charging a lead acid battery

(n00b question) I have a small (6 cell regular bike) leadacid battery and want to charge it via solar sheet of 15V - 0.3A. the voltage solar sheet changes and in cloudy day goes below 10V. does the ...
5
votes
4answers
352 views

Solar cells & Batteries

I was planning on having a couple of solar cells recharging a battery! My question for this is: How can I recharge a battery through solar cells and at the same time let the battery do some ...
4
votes
3answers
191 views

Simple voltage drop question

I am working on an antenna and ATMEGA-based reader. It is powered off of 2 6v deep-cycle marine batteries, and the reader/antenna draws 1 amp at 6 volts. I'm not sure about the amp-hours in the ...
2
votes
2answers
963 views

Solar power egg incubator

I'm going to Africa this summer for a veterinary mission and need an egg incubator. Considering I will not have a steady supply of power I need to find an efficient way to power an incubator ...
5
votes
3answers
3k views

Powering laptop from 12V sources without inverter

This question has two parts: 1) How inefficient is it to boost 12V to 120V and then back to 12V as in using a traditional car power inverter to power a laptop (i.e. the 12V car battery power is ...
4
votes
2answers
297 views

Solar powered water fountain

I am planning of building a solar water fountain which would serve as a bird bath in my backyard this summer. My requirements are simple: The fountain should be powered by solar energy, a small ...
3
votes
1answer
284 views

How can I build a solar powered car charger?

I found 12 solar panels, but they are very thin and fragile. They put out approximately .5V under an incandescent bulb. What would be the best way to turn these 12 panels into a 12V car battery ...