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Author Topic: Dump load Resistor  (Read 4206 times)
merkland
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« on: April 03, 2012, 02:30:59 PM »

I have acquired a grid-tie inverter which lists in its specification that it requires a 3 ohm/250 watt Dump Load Resistor, have looked on the Maplins and RS components web sites but cannot see anything that I can identify as suitable.
Can anybody point me towards something suitable that I could use?

merkland.
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Justme
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« Reply #1 on: April 03, 2012, 02:41:11 PM »

Er why?

Unless it is for wind & is just in case the grid goes down.
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HalcyonRichard
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« Reply #2 on: April 03, 2012, 02:49:49 PM »

Hi Merkland,
                  I suppose it's the 3 Ohm/250 watt combination that causes the problem. There are plenty of 50 watt metal clad resistors. If you put 5 x 15 Ohm in parralell and bolt them to a decent heatsink/metal plate it should work.  Don't forget the working voltage required and safety. (250 watts is 1/4 of a 1 bar electric fire).

Regards Richard
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billi
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« Reply #3 on: April 03, 2012, 03:06:02 PM »

Perhaps this   helps
http://www.windynation.com/printpdf/articles/grid-tie-inverters/wind-turbine-grid-tied-divert-load-sizing

you should find those "dump load resistor" on ebay UK   
« Last Edit: April 03, 2012, 03:13:36 PM by billi » Logged

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merkland
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« Reply #4 on: April 03, 2012, 09:43:55 PM »

Justme,
It is for a 24v wind turbine.

Merkland.
« Last Edit: April 03, 2012, 09:46:41 PM by merkland » Logged

200w wind turbine grid tied, 1x175w PV grid tie or to batteries,
2x55w PV to batteries, 24vx440ah battery bank. 3.5Kw grid tie (14xSanyo 250w facing 160degrees at 80 degrees inclination, Aurora 3.6 inverter), 2xflat panel water heating (for over 30 years )
guydewdney
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« Reply #5 on: April 03, 2012, 10:21:19 PM »

look at sauna heaters - very cheap and tough.
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ecogeorge
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« Reply #6 on: April 03, 2012, 10:34:28 PM »

I have 2 brand new 100w 5ohm resistors bought for a grid tie wind inverter  Wink
If connected in parallel they would give 2.5ohms 200w , - is that close enough?
PM me if interested, -10 post free if you want them.
rgds George.

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johnrae
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« Reply #7 on: April 03, 2012, 10:50:19 PM »

If it's only temporary and you are in a hurry you could always use a collection of truck headlamp bulbs

I frequently use 20w and 50w 12volt halogen bulbs as high power test resistors.
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