12VDC-240VAC Converters.

TheBigRedDog

Are they worth it and how long would a standard battery last on a 1500W one hypothetically?:)

auto electrical

worth it ??? if you want to run 240v in the car they are great but always have the car running when using them for any ammount of time or you will be walkin J. (Auto Electrical Concepts)

Dirty_Diesel

Running 1500w on a standard (48Ah) battery it would last around 20mins or so. However, if you got another battery or two and have them on a split charging system, then it should last a good bit longer. An even if they do go dead you can start the car off your own battery

5500

I wouldnt be using one without the engine on for sure,even with a split charge system if your running a big current draw over prolonged time your just going to eat the batteries.

If your intent on running without a constant recharge look for a drycell battery (likes of optima or stinger) they take better to constant discharge and charge but there not cheap.

TheBigRedDog

ok so is there any way of taking power from the alternator b4 it goes into the charging system so that it doesnt need/wear out the battery. what sort of watts does an alternator produce at standby rpm?

derry

really forget it

1500 watts at 12volts means ~ 150 amps

To supply 150 amps per hour correctly requires 1500 amp hour battery

Eg 1/10 the drain on the total capssity of battery in order not to exceed 1/10 of the capassity rule hwere if exceeded will break batteries fast as in low cycle life
1500 amp hour is roughly 30 of the typical medium sized car 50 amp hour batteries and would take up the whole boot of a big car and being lead break the shocks and cost about 30*80 euros ~ 2600 euros


Alternator of 200 amps (big truck type) through a fairly big battery such as 200 amp or minimum 150 amps would do the job a lot cheaper and lighter but engine has to rev at least 1,200 RPM to give the full 200 amps

At slow tick over like 900 RPM alterantors don't produce much power


Best is go to Aldi and buy a 2600watt generator for 400 euros if its only small use like the odd weekend

If you intend to do it lots like every day forget cheapo generators they last crap time and go for 1200 euro Honda 2000 watt generator thatr last years

If you still need too ( brain dead unless its for sensitive electronic items ) pass through a 12 volt battery and then hike it back to 240 volt there is lots of losses so 1500 watts will be tight on a 2000 watt generator expect more like 1200 watts as first you got to tranform 240 to 12volts and then invertpor back from 12 volts to 240 volts

The solution is realy dependent on what you want to use with 1500 watts like drills are easly done but some electronik items have issues with generators

Derry

Electricsail

what you are looking for is an inverter. We use them on vehicles, and fit them too. The length of time you can run one for from a battery has nothing to do with the size of the inverter, it is to do with the amount of energy, in Watts, you are using. If the inverter is connected to the battery with nothing running off it, it will last a few days, only using a few watts to run the electronics. If you are running say a charger for a battery drill, using 100Watts, = 8.3 Amps and you have a typical battery of 45Ah, it will last about 5 hours, it does not matter whether it is a 300Watt or 1500Watt inverter. However, all inverters are not created equal, some are known as quasi-sine wave or modified sine-wave inverters and often burn out the equipment attached to them. You will also need a true deep cycle battery to run the inverter from, the standard car battery is for engine starting and is not suitable for deep cycle use. See www.marineelectrics.ie for more info