Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

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300W transformer shuts off after 1-3 hrs (231w: OK w 181 watts)

I have a 300W transformer w 100' of 12 gauge wire. Runs fine with one 20w, one 11w and 3 50w floodlights. Connect another 50w flood and system runs between 1-3 hrs then shuts off w "E" error. Remove 4th flood and everything is ok again. ????? Ray

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1 Answer

The following might apply to your situation, or not.
Malibu recommends matching wattage of bulbs to wattage of power pack.
In your case, you have 181 watts on 300 Watt power pack.
Based on other folks questions to fixya, this condition can burn out the power pack.
Has your power pack overheated and been damaged?
I don't know, but it might be a good suspect.
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack

For more information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:
http://www.fixya.com/support/r8391011-power_pack_not_working

Posted on Feb 28, 2011

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I have (7) 20W bulbs on a newly wired line running on a brand new 200W Malibu transformer, worked fine for 2 days and now it's tripping the reset button - Any suggestions ??


1) Copy following link for malibu power pack tips for longer transformer life:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

2) Two plug choices on each outlet, Plug power pack into other outlet on receptacle.
Inspect for damage on outdoor outlet.
Replace outdoor outlet, and do not use quick connects. Connect wire directly to screws on side of device.
Replace GFCI outlet.

Feb 01, 2013 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

I have a 600w transformer - 300w per side- I ran two lengths of 12 gauge cable. 1st run is 100' with 8 20w lamps. 2nd run is 200' with 7 20w lamps. The 1st run is bright but the 2nd run is dim. I'm not...


Instead of 2 seperate wires run 1 long continuous wire & splice each light into it as you go along.There will be less resistance & the last light will be almost as bright as the first with very little difference in between.

Jan 17, 2011 | Malibu Hardware & Accessories

1 Answer

I have a Malibu ML300RTW transformer with a 50 ft. length of 16 guage cable supporting (4) 20w lights. Can I splice on another 100' of cable and add 4 more 20w lights or is there a cable length limitation?


Usually 50 - 75 ft. is as far as you want to go, especially with 16 gauge wire. What happens is the lights get dimmer as the length of the run increases. If you don't mind the lights getting noticeably dimmer, go ahead and add the other 4 lights. Using a heavier (12 gauge) wire will help a lot. You'll want the 12 ga. to start at the transformer, preferably running the whole length. Also, using a smaller watt bulb will help.

If you have a 120 volt outlet near the approximate middle of the new (total 150 ft.) run, you could relocate the transformer to that location and have two 75 ft. runs in 2 directions.

Nov 28, 2010 | Intermatic Malibu 300W Power Pack...

1 Answer

My lawn lights stopped working, transformer tested ok. What could be the problem?


You checked that power pack is getting electricity.
Scratch a wire across both terminal screws and see if there is spark.
If a bulb burns out, and is not replaced, additional power can burn out other bulbs.
Power pack should be unplugged if bulbs are not burning since that can burn out power pack.
Change out a couple bulbs and then plug-in power pack.
Check connections where lights tie into wire.

My power pack was doing same thing, I bought another power pack from Home Depot to check my lights. All but 2 bulbs were burned out. I replaced bulbs and returned new power pack.. and then power pack quit for good a month later.

I found tips to preserve power packs:
1) Match wattage of bulbs with wattage of power pack
-15 each X 20 watt bulbs = 300 watts, so install 300Watt power pack
2) Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
3) Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
4) When working on bulbs, unplug power pack or it may burn out.
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack

Nov 14, 2010 | Intermatic Malibu 300W Power Pack...

1 Answer

The lights stay on all the time and won't shut off. The front ones work fine but not the back lights. Any idea's? thanks,


Unfortunately when the power pack stops working there is no solution.
Your power pack has electricity so that is not the problem.
The bulbs turn on, so the bulbs are ok.
That means the power pack has malfunctioned, and needs to be replaced.

I did find some tips to help folks preserve their power packs:
1) Match wattage of bulbs with wattage of power pack
-15 each X 20 watt bulbs = 300 watts, so install 300Watt power pack
2) Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
3) Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
4) When working on bulbs, unplug power pack or it may burn out.
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack

Nov 12, 2010 | Intermatic Malibu 121W Power Pack...

1 Answer

I have six 20w bulbs in an 120 system. They used to all work, but now #1, two works, 3,4,5,6 also don't work. I have checked the bulbs and connections to main wire seem fine. Do I have too many on...


There is a break in the main wire between the 2nd and 3rd lights. Has anyone been digging or working in the yard lately?
While the transformer is fully loaded, six 20 watt bulbs won't overload it.

Aug 23, 2010 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Lights come on for about 2 min.and shut off. I turn off transformer for about 15 mins and turn on lights work for about 2 mins.


Unless you have the optional photo cell, I'd imagine you are overloading the transformer. Total up your lamp wattage and be sure it is less than the 300W rating of the transformer. The lights usually range from 10 to 50 watts, so you could have 30-10watt lamps or 6-50 watt lamps. The other possibility is that you have a short in your wiring or fixture. In either case if you overload the transformer it should cycle off to protect from overheating, and when it cools, it will restart. Try connecting just one luminaire to the transformer and see if it works. See link:http://www.malibulights.com

Jul 03, 2010 | Intermatic Malibu 300W Power Pack...

1 Answer

I have a 600w transformer and it have 2 300w circuits. Can I use 600 watts through one line i circular line?


There are two sets of terminals on the 600 watt x-former. If you have two 300 watt circuits, use one 300 W circuit on one output, and the other 300 W circuit on the other output. Use terminals A & B on each side. Each circuit will have 12 volts.

Jun 14, 2009 | Intermatic Malibu 300W Power Pack...

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