[RE-wrenches] Low wattage 120vac to 24vdc transformer for LED's

Dana dana at solarwork.com
Thu Jan 29 11:14:31 PST 2015


IOTA chargers; 120 vac/24 vdc are super efficient but probably larger than
you need, 15 amp at 24 vdc is the smallest unit. I have used them for
Sunfrost refrigerators when the utility came in and they wanted to keep the
freezer or frig. IOTA chargers essentially turn off when there is no load
and only use power proportional to the load when on.

 

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Dana Orzel 

Great Solar Works, Inc -  NABCEP # 051112-136

E - dana at solarwork.com  - Web - solarwork.com 

O - 970.626.5253  C - 208.721.7003 - No FAX Line

"Responsible Technologies for Responsible People since 1988"  

P Please consider the environment before printing this email.

 

 

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of Dave
Sent: Thursday, January 29, 2015 11:58 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Low wattage 120vac to 24vdc transformer for LED's

 

We are renovating a 25 yr old off grid house and one of things being done is
to change some 24vDC circuits to 120vac. The only problem that I'm having is
finding a low wattage 120vac to 24vdc transformer for a few strings of 24v
LED night lights (a few watts each string) that are built into some nice
hardwood trim in the bedrooms.

I just tested the following device and found that it uses 29 Watts to power
a 3W LED. Not an acceptable load for this house. It is labeled as LED
Magnetic Transformer by National Specialty Lighting part #
TR24L20DC-M20L24DC-AR Input: 120vac, Output 24vdc, Maximum 20W

Is there anything else available that will do this job and use a lot less
power than 29 Watts?

 

Thanks,

Dave

 

David Palumbo 

Independent Power LLC

462 Solar Way Drive

Hyde Park, VT 05655

802-888-7194

 

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