Charge controller help

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Senior Member

Joined: 01/08/2007
Location: Australia
Posts: 221
Posted: 12:53am 26 Aug 2010      

I just grabbed and IRF840 and stuck a 12volt 21 watt break lamp in as a load. It seems to saturate at about 6-7 volts.

Don't forget your only driving a relay. If its not that bigger relay why not just put in a small NPN transistor and remove the 100k to ground. An IRF 840 is like using a truck to carry a feather if your relay has a 100mA coil current Edited by Robb 2010-08-27