Dave Simmo
Junior Member
Recovering from Surgery. Shoulders had to be rebuilt. End Stage joint damage
Posts: 76 
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Post by Dave Simmo on Jul 8, 2018 15:00:04 GMT
Hi Folks on the Old Form I asked a question on how may AMPs at 12volts would the old Harbor freight Pittsburgh Heavy duty Battery Cutoff Switch handle.At Continuous I think it was 500 amps. HF used to have the data in their question and answer area. I am expanding and have a bench stock of these. My Bad I did not keep the data. Old timers do any of you remember???
HF no Longer Sells these anyone know where I can find the data??? Help
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Dave Simmo
Junior Member
Recovering from Surgery. Shoulders had to be rebuilt. End Stage joint damage
Posts: 76
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Post by Dave Simmo on Jul 12, 2018 15:10:27 GMT
The Official Statement From HF
Thank you for your recent inquiry.
The following information is directly from our technical notes on this item.
MAXIMUM VOLTAGE: 32 VDC
SURGE: 1000 AMPS FOR 10 SECONDS @ 12V
MAX. CONTINUOUS CURRENT: 150 AMPS @ 12V
Thank you,
Data Research from Multiple sites
One Site has stated 500 amps Maximum for 24 volt usage. Another site states 250 amps Maximum for 36 volt usage. One Site says 70 Amps.
I am Surprised I am slamming 280 amps into the switch since 2013. I guess the handel has gotten loose. Thats it. I have ordered a high Price switch that at 12 volts will handel 1500 amps.I am still trying to expand.
Ray
I Miss the old web site
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Dave Simmo
Junior Member
Recovering from Surgery. Shoulders had to be rebuilt. End Stage joint damage
Posts: 76
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Post by Dave Simmo on Jul 19, 2018 21:10:09 GMT
Just a update I cot a call from the folks who Make the 1500 amp at 12 volt continuous and 2500 amp surge. It arrived here and looking to replace the HF Switch with it. Worth the cash for the peace of mind
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Post by noland77 on Oct 18, 2018 1:01:11 GMT
Hey guys, does anyone know how the Wind turbine brakes work? The text below I copied off of the Missouri Wind & Solar site and there is a brake with. But I dont understand if it actually stops the blades or does it just stop generating power? It almost sounds like it reverses the magnets and stops the shaft from turning. Does anyone have one or know anything about this??
Small 3 Phase 50 Amp Wind Turbine Brake Switch
3 Phase Brake Switch
with Short Circuit Brake in a Steel 3 Gang Box
for use with AC or DC output wind turbines
50 amp, 3-phase switch with short circuit brake works with 12 volt to 250 volt systems. Designed for 1500 watt and smaller turbines.
Simple yet perfect for small turbine installations, this 3-phase switch uses a specialized switch to provide both disconnect capability as well as braking by shorting out the 3 wires of the stator. Although designed specifically for 3-phase turbines it works equally well for single phase AC turbines as well as DC turbines. Assembled in the USA using Global Materials.
Switch Positions:
Up: Turbine is connected to the battery or rectifier (switch is closed).
Middle: Turbine is fully disconnected (free spinning).
Down: Turbine wires are shorted together (brake is on).
This switch will handle 2500 watts continuously.
Rated at:
10 Amps at 250 Volts
15 Amps at 125 Volts
25 Amps at 60 Volts
40 Amps at 30 Volts
and 50 Amps at 15 Volts
Documents:
Instructions & Wiring Diagram
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Post by noland77 on Oct 18, 2018 1:03:51 GMT
I was an old member when I first stared messing with solar and you guys helped me so much. I have a cabn in the mountains of CO and I have had great luck with 1.5 KW solar an 600 watt wind turbine. Since 2012 runs fine I have small fridge, lghts,TV Direct TV and all we need. Just need to know about brakes. I have a resistor dump but looking into brakes at least understand them
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Johann
Junior Member
Posts: 56
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Post by Johann on Nov 13, 2018 0:55:12 GMT
A wind generator is basically like a car alternator.
When you turn your wind generator it will produce a 3 phase AC voltage/current. That 3 phase AC voltage/ current is sent to a 3 phase rectifier/diode which will turn the 3 phase AC voltage/current into a DC voltage/current.
Now the DC power is sent to the batteries and the plus and minus is hooked up directly to the batteries. If the battery reaches about 13.8 to 14 volts the dump controller which is basically a voltage controller will send power from the battery to a big resister which acts as a big load and that will drain your battery . When the battery gets below a set voltage the dump controller will disconnect the load/resister and that will charge the battery again.
This is the principal how a wind generator works and how it controls the battery charge.
Now to the braking system.
The breaking system on such system is usually NOT a mechanical system. It is a ' electrical ' break.
The breaking is done by shorting the 3 AC wires/phases between the generator and the 3 phase diodes/rectifiers. This puts a enormous electrical load on the generator and the generator will slow down, but if it is windy the generator/blades will not come to a complete stop since the generator slows down and can not produce enough power to stop the generator all the way....it is the producing power that slows the generator down....
You do not want to disconnect a wind generator unless it is necessary work on it. A wind generator always need a load (battery , short/break etc )attached to it or the generator can run-away meaning over-spin and the blades could break or other damage could happen.
A dump load could be anything..... like a water heater element or room heater or even a secondary set of batteries with an secondary dump controller system.
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