1000W 240V pure sine wave AC power inverter for 24V battery

Lenny HB

LIFE MEMBER
Oct 18, 2007
32,267
60,471
On the coast in West Sussex
Funster No
658
MH
Hymer B678 Dynamic Line
Exp
Since 2008 & many years tugging
Inverters that run off 24v are common used in truck cabs as trucks are 24v.
Most of us with inverters have 1000-2000 watt inverters running ogf that size battery bank, mostly not used for long but at full power 1000 w one would take about 90amps.
 
Aug 18, 2017
224
694
Warwickshire
Funster No
50,050
MH
Eldiss AutostratusCK
Exp
3 years and still learning
@ShiftZZ .... thanks for posting that link :)
I was looking for a 300W - 12V Pure Sine Wave Power Inverter to run my laptop when no ehu.
They have one on sale for £68 which is good for pure sine wave.

Subscribers  do not see these advertisements

 

Mr Chrysalis

LIFE MEMBER
Jul 8, 2016
2,308
171,651
Lincolnshire
Funster No
43,982
MH
Rapido 890F A Class
Exp
Since 2016, caravans before that, folding Caravan, tents before that
https://www.sunshinesolar.co.uk/pro...5yPXGRq9xd9ZvkoTmlZnCh4pgv7kMLNcaAqZ1EALw_wcB


Just seen this...

24v? How would you wire that up in a Motorhome..

How long would 2 x 110amp batteries last pushing out 1kw?
Well, I guess IN THEORY, you would connect the two 12V batteries in series to give you the 24V supply needed, but as they are normally connected in parallel to 12V inputs and outputs, it’s probably not practical. I guess a series of relays could simultaneously make the 24V circuit whilst breaking all the 12V ones. Sounds like a good question for a Physics O level paper!
 
Jan 28, 2008
8,323
12,589
walthamstow east london
Funster No
1,353
MH
renault burstner delphin
Exp
7 years campers before that
Well, I guess IN THEORY, you would connect the two 12V batteries in series to give you the 24V supply needed, but as they are normally connected in parallel to 12V inputs and outputs, it’s probably not practical. I guess a series of relays could simultaneously make the 24V circuit whilst breaking all the 12V ones. Sounds like a good question for a Physics O level paper!
no need to break any circuits you can run 24 and 12v of the same pair of batteries we used to run race cars that way only using the 24v for the starter

Subscribers  do not see these advertisements

 
Apr 27, 2016
3,654
3,683
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
How long would 2 x 110amp batteries last pushing out 1kw?
One 110amp-hour battery (12 volts) holds 12 x 110 = 1320 watt-hours = 1.32kWh

So obviously two of them will hold 2.64 kWh.

In theory they would push out 1kW for 2.64 hours, but in reality (a) the conversion is usually less than 90% efficient, (b) you won't want to drain the batteries much below 50% and (c) at high amp rates the capacity is reduced from the advertised value. So I wouldn't use it more than half an hour on a regular basis.

But that's OK for hairdryer, microwave, that kind of thing. Not much good for extended loads like air-conditioning or heating.

24v? How would you wire that up in a Motorhome..

24 volts? Just don't go there! Sure, it's possible. But Unless you're doing it for the entertainment value, it's cheaper to throw a 24 volt inverter away and buy a 12 volt version. Unless of course you have one of those massive rigs that has truck-style 24 volt electrics already.
 
Apr 27, 2016
3,654
3,683
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
no need to break any circuits you can run 24 and 12v of the same pair of batteries we used to run race cars that way only using the 24v for the starter
How do you do that? Do you leave all the 12V circuits connected to one battery, and disconnect the second battery to hook it up in series?
 
Aug 18, 2017
224
694
Warwickshire
Funster No
50,050
MH
Eldiss AutostratusCK
Exp
3 years and still learning
just get a 12v charger for the laptop about £20

My high spec Dell laptop requires a 19.5volt 130 watt power supply. I asked advice from the techies at Dell and was told not to use 12v chargers. They recommended the pure sine wave inverter.
 
Aug 6, 2013
10,970
13,946
Kendal, Cumbria
Funster No
27,352
MH
A Class
Exp
since 1999
How do you do that? Do you leave all the 12V circuits connected to one battery, and disconnect the second battery to hook it up in series?
No. 12v can be taken from the link between the batteries meaning only one of them is used to supply 12v. It's an old wagon drivers trick to run 12v CB radios in their trucks. And it really doesn't work long term because it unbalances the load on the batteries causing early failure of the one used to supply 12v. For @mitzimad s racing car use imbalance is irrelevant because of the way they'd be maintained and charged.

This sort of discussion simply generates lots of posts and lots of confusion. The simple (and correct) answer is that 24v inverters (or any 24v equipment) can only be used on vehicles with 24v electrics. 12v inverters (or any 12v equipment) can only be used on vehicles with 12v electrics. If there is a particular need to operate equipment from a supply that is outside its design voltage range there are DC-DC converters available.

Subscribers  do not see these advertisements

 
Last edited:
Top