27-02-2012, 10:44 AM
if the headlight lamps are connected straght to the battery the only issue will be having thick enough wire that dont melt ie:not speaker wire!
you only need a relay if the switch your using cannot switch the full load of the lamps
the other issue you will have is the time you need light
il explain
say your battery has a capacity of 55AH, that will supply 55amps for 1 hour
1 std 55w lamp takes 4.6amps so the battery will power 1 lamp for 11.9 hours
2 lamps 9.2 amps so battery will power 2 lamps for 5.9 hours
4 lamps 18.4amps so battery will power 4 lamps for 2.9 hours
ect
the 55ah battery would be a heavy duty diesel type in brand new condition older batterys with smaller ratings will proform a lot less than the lable says
dan your best bet would be to buy a small petol 2.5kw generator and run 4 500w halagon floods you could probably get this for around £100
you only need a relay if the switch your using cannot switch the full load of the lamps
the other issue you will have is the time you need light
il explain
say your battery has a capacity of 55AH, that will supply 55amps for 1 hour
1 std 55w lamp takes 4.6amps so the battery will power 1 lamp for 11.9 hours
2 lamps 9.2 amps so battery will power 2 lamps for 5.9 hours
4 lamps 18.4amps so battery will power 4 lamps for 2.9 hours
ect
the 55ah battery would be a heavy duty diesel type in brand new condition older batterys with smaller ratings will proform a lot less than the lable says
dan your best bet would be to buy a small petol 2.5kw generator and run 4 500w halagon floods you could probably get this for around £100