ralf2
Well-Known Member
just purchased a halfords inverter battery booster,the battery capacity is 20ah and it has a 300w inverter .How long could i expect it to run a lcd 40w tv for, any ideas???thanks all
halfords inverter/battery booster
- Thread starter ralf2
- Start date
Talbot
Well-Known Member
will almost certainly run it for much longer using the DC and a DC/DC converter.
To get some idea, you need to know the power requirements of the TV. If the battery capacity is 20 amp/hrs, then you can only use 10 of those at the most without risking damage to the battery.
To get some idea, you need to know the power requirements of the TV. If the battery capacity is 20 amp/hrs, then you can only use 10 of those at the most without risking damage to the battery.
BAtoo
Well-Known Member
40W @ 12V draws about 3.5A per H therefore not to exceed 10AH you have around 3 Hours
VicS
Well-Known Member
You can afford to run the battery well down if it is a deep cylce one but any battery should be recharged promptly and not left in a discharged state.
Remember that no inverter is 100% efficient. I wonder if a 300watt inverter just used for 40 watts is going to be considerably less than 100% efficient.
Remember that no inverter is 100% efficient. I wonder if a 300watt inverter just used for 40 watts is going to be considerably less than 100% efficient.
Richard10002
Well-Known Member
There is a noisy fan when the inverter is in use. It maymake watching TV unbearable?
I used mine to run my laptop and IIRC it didnt last long.. maybe a couple of hours.
I used mine to run my laptop and IIRC it didnt last long.. maybe a couple of hours.
davidpbo
Well-Known Member
I presume the LCD you are using is mains voltage and does not have an external power supply. If it does it may be more efficient to find a converter which will convert the voltage from your battery to that required directly. I used to power my laptop via inverter and power supply. I now power it using a DC to DC converter which steps the voltage up to 19V. I have been less successful in finding something similar which will give me the range of voltages used by small electrcal equipment e.g. 9,6,4.5 & 3V.
davidpbo
Well-Known Member
CPC (cpc.co.uk) do a range of !2V converters for laptops which do not have fans if that is of any use. I use one made by Trust. if you want the order code PM me and I will try to dig it out.
David
David
pappaecho
Well-Known Member
My 40 watt TV is driven from an external mains transformer and runs perfectly on the 12 volt service battery. As the battery bank is 200 amp, and the unit uses say 3.5 amps per hour mine would last for days.... but if you are stepping up the juice from 12 to 240 and then back down again it will depend on the efficiency of the invertor - I would assume 50% unless someone knows other wise.