What 12v inverterdo I need?

[emjaiuk]

I hope posting here is ok, I dont seem to be able to post in the Technical Forum.

I've got a Pro-Rider E-Tourer bike, 36v, 10amp, which I'm very happy and satisfied with. My charger is marked up 240v/1.8amp input, and 42v/1.8amp output.
What size and type inverter do I need to recharge the battery from my MH 12v leisure batteries? I only intend to use it whilst driving.

I'd also be interested to know how to calculate the answer.

Malcolm

 

[emjaiuk]

Anyone know?

 

[averhamdave]

I'm sorry your posts seemed to have been missed. This sort of question is usually dealt with speedily.

Your charger needs an inverter of a minimum of 432w. This is calculated simply by the formula: watts = volts x amps. So 240v x 1.8amps = 432w.

I've tried a whole array of inverters from China in my motorhome and usually without success. You would think a Chinese inverter marked "500w" would do the job for you but I'd predict it won't - it'll either have the overload buzzer screaming at you or it'll simply burn out.

I'd buy a 600w inverter from a reputable supplier in the UK and just buy once, which is what I did in the end (in my case I bought a 1000w unit).

If you follow the morotorhome scene, you'll know people like RoadPro and Vanbitz etc who'll sell you good gear with a warranty.

 

[emjaiuk]

Many thanks for that. I presume it doesn't have to be a pure sine wave invertor?

Malcolm