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Forum Index : Windmills : reg for ni cad batts

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Pt w/field Matt

Senior Member

Joined: 24/02/2006
Location: Australia
Posts: 105
Posted: 11:28am 19 Nov 2006
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hi a dude gave me some supper old steel case ni cads in 32v form and just wondering what type of voltage reg/voltage they require for connection to my 36w solar panel? tried the single phrase m/cycle rectifier/regulator that i use on the same panel but on a car batt that shuts off at 14v but goes way past that on these ni cads,any ideas
matt down south
 
davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499
Posted: 09:28am 20 Nov 2006
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How many volts does the PV panel put out? 17-20 Volts. This won't charge a 32 Volt battery.

Search for "SMPS inverter" maybe with MPPT to get a good match between the PV panel and getting the most into your battery.

Also, suggest some research into issues with charging Ni-Cad versus lead acid, ie constant current/constant voltage charging.

Good luck
 
Pt w/field Matt

Senior Member

Joined: 24/02/2006
Location: Australia
Posts: 105
Posted: 11:31am 20 Nov 2006
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hi davef   the batteries are in a 12volt string i just want to know the charge voltage
matt down south
 
makourain

Senior Member

Joined: 19/04/2006
Location:
Posts: 111
Posted: 10:23pm 20 Nov 2006
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it doesnt really matter what sort of battery it is, if its 12 volts the charging voltage will always be the same, between 13 and 14 volts roughly.
 
RossW
Guru

Joined: 25/02/2006
Location: Australia
Posts: 495
Posted: 09:45am 21 Nov 2006
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  makourain said   it doesnt really matter what sort of battery it is, if its 12 volts the charging voltage will always be the same, between 13 and 14 volts roughly.


Oh, perfect advice to offer someone - if you want them to toast their batteries!

Most manufacturers specify VERY SPECIFIC and voltages. Mine for example are 2.28V per cell. Cook them at 2.4V/cell and they will be ruined. Undercharge them at 2.2V/cell and you will ruin them.

To the original poster: check with the manufacturer for those SPECIFIC cells. NiCad cells can be quite fussy.

The voltage also varies with cell temperature.
 
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