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smoke
Starting Member
Netherlands
3 Posts |
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agrifabs
New Member
United Kingdom
76 Posts |
Posted - 25/01/2008 : 15:14:28
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hi smoke, the motor doesnt tell you how many rpm it does at 130v,
if for example it stated in the description that it runs at 1500rpm at 130v then we would divide 1500 / 130 = 11.5 rpm per 1v then we would times 11.5 x 13v (thats what voltage we need to charge a 12v battery) = 149 rpm, any motor that will create about 13v in under 350rpm is a good motor for wind turbine applications,
hope this helps you,
ps, email the seller and ask him the rpm, then let us all know! |
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Del
Junior Member
United Kingdom
369 Posts |
Posted - 25/01/2008 : 15:21:40
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Hi Greetz,
What you need to calculate is the rpm needed for a motor to turn at in order to provide approximately 13v. This is around the point that the volts from the generator will exceed those in the battery and at this precise point current will flow from the generator into your batteries. Ideally this rpm point will be as low as possible so that current is flowing as often as possible.
In order to calculate this point you need two pieces of information from your potential generator: that of the voltage and the rpm. The motor you are asking about is 130v and from what I can see on the label it looks like 4750 rpm, but I can't quite see it properly so I'd ask the seller. Anyway, 4750 divided by 130 gives you the rpm for a single volt, in this case it's 36.5. You simply multiply this figure by 13 to give the rpm for 13 volts. So 36.5 x 13 = 475rpm. This is a bit high really. I think you would want something no more than 400rpm maximum, unless you live in a particularly windy area.
Hope this helps
Del. |
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fungus
Moderator
296 Posts |
Posted - 25/01/2008 : 15:31:24
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| If you read the forum you would see it's been discussed in the next topic down , its a 4500rpm motor. |
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what would this one do...
Posted - 25/01/2008 : 14:50:37
