Adding wind power to a solar system

Jan 1, 2009 05:43 pm
Adding wind power to a solar system

Hello,

I'm thinking of adding a small wind turbine to an existing solar system (off grid with a battery bank).  Can I add an additional charge controller designed for wind power and tie it directly to the battery bank?

Thanks, Steve
 
578 Posts
Jan 2, 2009 10:05 am
Re: Adding wind power to a solar system

it depends on the turbine.  some turbines will come with controllers, (either built in) or in an enclosure.  if that is the case, follow the manufacturer's instructions.

if you choose a turbine that does not come with a controller, you will likely have to use a diversion load controller setup.  this is different than a pv controller because it does not go in between the turbine and the batteries like a solar controller does.  the turbine goes to the batteries, and the controller does as well, but not in between.  the diversion load controller closes a circuit to a diversion load when the battery hits a pre-set voltage point.  this way it prevents overcharging of batteries without removing all loads for the turbine.  removing all loads from the turbine without shorting it usually will wreck the turbine as it will spin itself to failure.

cheers,

james
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Jan 2, 2009 10:32 am
Re: Adding wind power to a solar system

Thanks James;
I'm thinking about the SouthWest air x.  It looks to be self regulating.  I'm wondering if it will shut off when it sees a solar input at the batteries.

Steve
 
578 Posts
Jan 2, 2009 11:12 am
Re: Adding wind power to a solar system

any battery will read higher instantaneous voltage while under charge, so in that sense, sure the air-x controller could be fooled.  so can a diversion load controller though.  it depends on a few factors, including state of charge, rate of pv charging, temperature. 

so it wont "see" solar input, but if there is input, the voltage will be rising, so the likelyhood of the turbine regulating is higher, to the best of my knowledge.

james
altE staff

AltE
"Making Renewable Do-able"
http://www.altEstore.com/

Tel: 877.878.4060 x107  or +1.978.562.5858 x107
Fax: 877.242.6718  or +1.978.562.5854
 

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