 Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT
1 edit | battery backup lights I thought about doing this a few years ago but now I'm getting a bit more serious about it, one thing I can't remember is how do you get the lights (in this case LED's) to stay off until the power fails? I was thinking 350 mA should be enough for the hallway and dining room area. At the time being I was thinking about using a 17 Ah battery with a 350 mA driver powering 3 LED's in series.
I have two of these here:
»www.ledsupply.com/creexre-rb.php
and a single 3-Up neutral white which the LED's still work but something fell on the dies while curing on a heatsink.
»www.ledsupply.com/07007-pw740-l.php |
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 SparkChaserPremium
join:2000-06-06
Downingtown, PA
kudos:3 | anything from a simple relay to a opto coupler would provide an isolated signal that the power is on. When that signal changes state you've lost power.
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | I'm sure a relay would be a bit more simple, I can't figure out how long of a runtime I would get.. I would guess around maybe 19-22 hours? |
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lutful... of ideasPremium
join:2005-06-16
Ottawa, ON Reviews:
 ·TekSavvy DSL
| said by Subaru:can't figure out how long of a runtime I would get.. I would guess around maybe 19-22 hours? Typical 3 LED setup will be consuming about 350mAh each hour.
With a new fully charged 17Ah battery, maximum run time would be about 40 hours but you should really implement a cut off to prevent battery voltage from dropping below 10V.
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | Heh I was off a bit on that :P Not too sure if I would be 40 hours without power.. the hurricane sandy was different.. normal storm stuff it's maybe 5 hours at best..
So for an AC relay I would be looking for a N/O relay? |
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 shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | An normally closed relay on the power connected to an AC source. When power is lost, it closes and turns on the power to the LED's. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | So something like this would be ok?
»www.mouser.com/ProductDetail/Omr···nUCcPAza
10A should be more then enough rated
and I was thinking about building this charger.. i'd just need the IC and jack and that's about it.. I have the rest here.
»www.instructables.com/id/DIY-Lea···Charger/
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It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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SparkChaserPremium
join:2000-06-06
Downingtown, PA
kudos:3 | reply to Subaru
Yes, that relay would work. You use the NC contacts as shdesigns  said. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | said by SparkChaser:Yes, that relay would work. You use the NC contacts as shdesigns said.
I was looking in the data sheet something like this..
SPST-NO Semi-sealed G2R-1A
SPDT Semi-sealed G2R-1
I would assume that G2R-1 would be NC since it does not list anything right?
--
It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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SparkChaserPremium
join:2000-06-06
Downingtown, PA
kudos:3 | A SPST would not have a normally closed contact. It has to be SPDT. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | said by SparkChaser:A SPST would not have a normally closed contact. It has to be SPDT.
got it, now I just need to find a driver that I have left over.. not sure if royal blue would be great for the hallway since the wavelenth is 450nm.. I had them in the kitchen for awhile and everything florescent was glowing  |
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 Sc0ttKneedraggerPremium
join:2000-11-13
Stockholm, NJ | reply to Subaru
if you want an easy out, they're only about $20 online.
for that cheap, it may be fun just to grab one and modify it to your liking. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | Cheap way out too easy only a few things I need to order, I would be using a small aluminum bar as a heatsink. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | reply to Subaru
ah poo can't find the 1 amp driver, I can at least I can start with the sla charger. I saw two.. one being a bit more in-depth.. and the other one is simple. Having said that the simple one does not seem to trickle charge? I haven't messed too much with SLA but I know the charge rates are low but is it safe to keep a charge on it long term? Complex charger circuit » www.talkingelectronics.com/proje···SLA.htmlsimple » www.instructables.com/id/DIY-Lea···r/#intro--
It's NOT Ni-kon It's NE-KON!
LG is NOT Lifes Good It's Lucky Goldstar!
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shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | I have one I used:
»shdesigns.org/gcellchg.html
I set it to 13.4V. Will charge fast for the the first 75% then ramps down to 0.
It is what is called a "float charger".
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Scott Henion
Embedded Systems Consultant,
SHDesigns home - DIY Welder |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | That design looks good and the LED is a nice touch so after I get my battery (might use one I have already) I just find what the charge settings are and just set it to that? |
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shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | Yes, see what the OEM says for float charge voltage. |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | I will have a check, I hope it's listed on the battery, btw nice use of off the shelf parts, I have everything listed but the heatsink and the N22222A
My project box may be a little small but I have at least 3 sizes laying around |
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shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | Nearly any general purpose NPN transistor will do.
Will need a heat sink. I used a box about the size of a biz card and 1" tall. I replaced the cover with an aluminum plate that doubled as a heat sink.
Works best with about 16V in, higher is just wasted as heat. I use it with a solar panel to keep my riding mower batt charged.
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Scott Henion
Embedded Systems Consultant,
SHDesigns home - DIY Welder |
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Subaru1-3-2-4Premium
join:2001-05-31
Greenwich, CT | did you take any measurements of the heatsink? I don't know if I have any spare transformers but say it had a 15-17 Vout voltage.. trying to get an idea if that's too hot to run in a case without a aluminum plate but with a heatsink on it..
if it's really bad I could add a small 40 mm fan to the case |
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