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Outdoor & Recreation
Campers, Vans & 4WD's
safety for gas fridges
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<blockquote data-quote="condor22" data-source="post: 292625" data-attributes="member: 1932"><p>A portable 3 way fridge typically uses a 150W element. Divide that by 12V = a current draw of 12.5amps. So on a cooler night it might cycle at about 25% so 3.1 AH, but on a warmer night it will cycle nearer 60% = 7.7 AH.</p><p></p><p>A 100AH AGM auxiliary would last between a day at best and just about overnight at worst. But in saying that an AGM should only be cycled between 25 and 50%, so cut those times in 1/4 to 1/2 and it won't be enough.</p><p></p><p>A 3 way is meant to be used;</p><p></p><p>On 240VAC for initial cool down, or if mains are available i.e. a caravan park,</p><p>On 12 VDC only when driving so that the charging keeps up with the demand (alternator or DC to DC charger),</p><p>On LPG when no mains available and camped up, but always in a well ventilated area and never when driving.</p></blockquote><p></p>
[QUOTE="condor22, post: 292625, member: 1932"] A portable 3 way fridge typically uses a 150W element. Divide that by 12V = a current draw of 12.5amps. So on a cooler night it might cycle at about 25% so 3.1 AH, but on a warmer night it will cycle nearer 60% = 7.7 AH. A 100AH AGM auxiliary would last between a day at best and just about overnight at worst. But in saying that an AGM should only be cycled between 25 and 50%, so cut those times in 1/4 to 1/2 and it won't be enough. A 3 way is meant to be used; On 240VAC for initial cool down, or if mains are available i.e. a caravan park, On 12 VDC only when driving so that the charging keeps up with the demand (alternator or DC to DC charger), On LPG when no mains available and camped up, but always in a well ventilated area and never when driving. [/QUOTE]
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Outdoor & Recreation
Campers, Vans & 4WD's
safety for gas fridges
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