ROAL Forums

48 VDC LED input

2011-07-05T23:14:44-05:00

Hello,

I live in a solar powered off grid home. My battery bank is 48 VDC. The lighting in my house is a mixture of 48 VDC and 110 VAC (powered through my Xantrex inverter). In my kitchen I have two light fixtures that take as input a direct feed from my batteries: 48 VDC, powering from one to three DC CFL lamps. I have the wiring in place for two additional 48 VDC fixtures, but I have yet to either build or buy the appropriate units. I’d love to have LED fixtures here instead of CFL. So either I need a LED fixture that can take 48 vdc (which ranges from 44 vdc up to 60 vdc during the solar charge cycle) directly, or a driver that takes the nominal 48 vdc as input and outputs 12 vdc to power a more standard 12 vdc LED fixture. Can ROAL help with this?
Thanks!
Peter Clark

Maximum Tropo RLDD015L-1250 Loads per 600w/1000w Triac dimmer ?

2011-05-23T12:24:08-05:00

My church has purchased qty-172 ELITE RL630-14W-120V-DIM-FL-30K-W-WH
recessed ceiling LED lighting for whole-church retrofit. The ELITE RL630 uses
the ROAL Tropo RLDD015L-1250 per 14-watt LED light fixture.

What is the *maximum* quantity of RLDD015L-1250 LED-drivers (rated 15watts)
that can be used per 600-watt dimmer and per-1000-watt dimmer ?
Can I use simple power-division calculation: 600/15w=40; 1000/15w=66.7 ?

The www.iuseeliteled.com web-site Dimmer Matrix web-page restricts
*MAXIMUM* fixtures per 600-watt dimmer to qty-4; and only 7 per
1000-watt dimmer. This seems to be reverse of ROAL application
notes for Tropo dimmers, which suggest that triac-dimmers require
a *MINIMUM* load of 40-watts per 600-watt dimmer = approx. 4 LED
Tropo-driven fixtures.

My technical suspicion is that since ROAL Tropo LED-drivers use a
switched-mode power-supply, that the power/current-spike during
high-frequency switching conduction might be quite large: therefore
possibly limiting maximum Tropo LED-drivers per 600watt dimmer
to a quantity less than 40 (40*15=600-watts)...!?!?!?

Thanks for any technical direction.

Bob B.

Roal Tropo model RLDD015L-700 and the LED flickers

2010-12-22T19:38:45-05:00

I am using a Roal Tropo model RLDD015L-700 and the LED flickers when dimming. What can I do to correct this?