amps volts and whats?

[woodywormfarm]

Hi everyone, having read a few forums recently this looks like the one offering the best advice.Clearly a lot of us are here because we have a problem we cant figure out and need some help and i am no exception. Some months ago i fitted a system to my camper in the uk and then took a 28 day european tour and ended up in Cyprus where i live.I installed 2x120 watt panels in series through a 30 amp charge controller to 3x110 amp hour deep cycle 12v batteries. I added a 2000 watt (4000 peak) mod.sine wave inverter,fused at 40w between the batteries and the inverter. This allowed me to power the fridge/microwave etc.
The sun index is quite good out here (over 5)and gives an input peak of between 10 and 13 amps so the batteries are always fully charged when not using a load.My problem is i tried to power my swimming pool pump and the 40w fuse blew after about 10 seconds. The pump is rated at .55kw/230v/4.5amps. am i expecting too much from my system or is this achievable? Many thanks for any advice in advance,Woody

 

[poheZ]

Your pump will have a high start up current and may need an over current device that allows for this

 

[pmac10]

i agree with above, but could you confirm the type of fuse as i dont know of 40w fuse?

 

[woodywormfarm]

Its a larger type fuse taken from a saab,after all it is a 12v system.

 

[telectrix]

but what is the amperage of the fuse? 5A,10A,15A??

 

[woodywormfarm]

It is 40 amps, is the load drawing lots of amps to the inverter because the voltage is only 12 or 13?
hence the title reference to the relatio between amps,volts and watts?

 

[telectrix]

yes at 12v the current will be 20 x the current at 240v, i.e for 2A load at 240v, the 12v current will be 40A. if you got a surge in start up, you need to fit an anti-surge fuse. just looked back at your original post. if the pump is 4.5A, then at 12v, that will be 90A. and that's not allowing for the inverter loss!