(1 November 2013, 16:05)River Song Wrote: OK - I am going put to buy a deep cycle battery thingy.
Now can anyone give me a (blonde) answer
The one Im looking at £89 is a 125 AH battery
I guess this refers to Amp Hour. I know what an hour is
and I can get a definition of an 'amp' but it makes it no clearer.
Is 125AH good? If so why? How long would it last before it needs recharging if it was connected to a 1KW or 2KW inverter.
If I connected two together would that double the time?
Can it keep my Harveys Bristol Cream chilled or my Hair Straighteners hot :-) :-)
It means it should put out a maximum of 125 amps for an hour. If you use all of the 1KW from the inverter this should be around 4 amps output if my calculations are correct (1000 watts / 240 volts = 4.16 amps). Which means your battery should last about 30 hours (125AH / 4 amps = 31.25). However this is seldom the case as there is a degree of redundancy involved so it's best to take off about 30%. Therefore your 125AH battery is really about 87.5AH (87.5AH / 4 amps = 21.875), so in reality it should last about 20 hours. One thing though is you shouldn't really completely discharge to battery and it should not be allowed to go down below about 30% before recharging, so taking taking that 30% off as well we have - 61.25AH / 4 amps = 15.31 hours, so you will need to recharge the battery after about 15 hours use at a maximum of 1 KW (4 amps).
LAC
(1 November 2013, 17:48)LawAbidingCitizen Wrote: (1 November 2013, 16:05)River Song Wrote: OK - I am going put to buy a deep cycle battery thingy.
Now can anyone give me a (blonde) answer
The one Im looking at £89 is a 125 AH battery
I guess this refers to Amp Hour. I know what an hour is
and I can get a definition of an 'amp' but it makes it no clearer.
Is 125AH good? If so why? How long would it last before it needs recharging if it was connected to a 1KW or 2KW inverter.
If I connected two together would that double the time?
Can it keep my Harveys Bristol Cream chilled or my Hair Straighteners hot :-) :-)
It means it should put out a maximum of 125 amps for an hour. If you use all of the 1KW from the inverter this should be around 4 amps output if my calculations are correct (1000 watts / 240 volts = 4.16 amps). Which means your battery should last about 30 hours (125AH / 4 amps = 31.25). However this is seldom the case as there is a degree of redundancy involved so it's best to take off about 30%. Therefore your 125AH battery is really about 87.5AH (87.5AH / 4 amps = 21.875), so in reality it should last about 20 hours. One thing though is you shouldn't really completely discharge to battery and it should not be allowed to go down below about 30% before recharging, so taking taking that 30% off as well we have - 61.25AH / 4 amps = 15.31 hours, so you will need to recharge the battery after about 15 hours use at a maximum of 1 KW (4 amps).
LAC
Meant to also say you can increase the size by wiring the batteries together in parallel (positive to positive and negative to negative) so 125AH wired together in parallel would be added together as 250AH.
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