Comments on: Customers Reviews of Coleman Solar 4.5-Watt 12-Volt Deep-Cycle Battery Charger #CL-300

By: paul

paul — Sat, 19 Jun 2010 09:15:26 +0000

HERE IS THE TRUTH!!

Power = Volts x Amps
Therefore

Amps = Power / Volts,

So 4.5W/12v = 0.3A

A car headlamp is typically 60W, thats 5 Amps, a 12v flourescents is about 12w so therefore you need at least 1 Amp.
The maximum efficiency of solar panel is about 7-13%, with cheap ones about 3-5%,
therefore on a sunny day, its about 100W (uk) to 300W (asia) per square meter. Assuming the panel has a 5% efficiency, that makes the solar irradance between 5w and 15W per square meter (maximum possible), so if its perfect conditions you may get 4.5W. They say you get about 50-60% of the claimed power over a year, so lets take 50%, therefore 50% of 4.5W is about 2.25W. The reality is if you use this to charge your car battery, then you need to disconnect all the power cables onto the battery (because there is residual loss, eg clock, alarm etc), and keep it in the sunlight for weeks.
To be realistic you need between 40 – 80 Watt solar panel to get anything usable.
Hope this helps
Paul

By: admin

admin — Thu, 07 Jan 2010 18:46:50 +0000

Please Christian have a look here:

http://www.12voltsolarpanels.net/boat-solar-chargers

and here

http://www.12voltsolarpanels.net/12-volt-solar-powered-battery-chargers

By: Christian

Christian — Thu, 07 Jan 2010 15:45:12 +0000

Dear Solar Charger Users,

I would like to use a deep charge boat battery to provide about 2-3 hours of light a day for my chickens. The battery would be running a timer all the time and 2-3 20 watt bulbs. What type of charger would I need? How much do they cost?

Thanks for the help.

Christian

By: Reader’s Q&A: Looking for a solar unit to keep the battery charged through the winter months

Mon, 15 Jun 2009 17:44:56 +0000

[...] model. If You need a panel good only to charge maintenance and with a cheap price have a look at Coleman Solar 4.5-Watt 12-Volt Deep-Cycle Battery Charger #CL-300 Thanks in advance for your help, and for a wonderful [...]

By: admin

admin — Wed, 18 Feb 2009 06:04:00 +0000

Dear Kellon You can hav a look here: http://www.12voltsolarpanels.net/basics-solar-power-systems-produce-electricity

It’s a guide to calculate the power You need with a solar panel.
Thx!

By: kellon

kellon — Tue, 17 Feb 2009 22:45:21 +0000

this sounds intresting. i want to buy a solar pannel and charger for my solar water heater so when the sun goes down i can use a heater which is 1200w and run it on battery power. what is the specification that will be recommend for the solar pannel and the battery that will be able to complement the heater

By: admin

admin — Fri, 07 Nov 2008 05:52:10 +0000

Thank You Steve, Your feedback was very useful and surely will help others to the right decision.

Please can You share your solar array project?

Thx!

By: Steve Foxs

Steve Foxs — Fri, 07 Nov 2008 01:18:55 +0000

I have purchased two of these 4.5 watt coleman solar panels, i plan on building a solar array two power electronic lighting in my home. i have found out that the battery clips that were provided with my solar panels were reversed, meaning that the color codes on the clips were wrong. i hope that this info may help someone else having problems. stevefox@springfieldgrp.com