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Post by canaldweller on Nov 3, 2016 17:10:56 GMT
We have a Waeco Coolmatic CR-110. Have just checked for volt drop and it is 0.43v. The voltage (fridge off) is 12.9v and (switched on) 12.47v.
It is 8 metres from fridge to batteries. The manual says, for this length, it should be 12mm2 . Does this sound right? I ask because it could be a problem getting that size cable through the boat.
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Post by tonyqj on Nov 3, 2016 17:13:00 GMT
We have a Waeco Coolmatic CR-110. Have just checked for volt drop and it is 0.43v. The voltage (fridge off) is 12.9v and (switched on) 12.47v. It is 8 metres from fridge to batteries. The manual says, for this length, it should be 12mm 2 . Does this sound right? I ask because it could be a problem getting that size cable through the boat. Yup, afraid that's right. You could probably get away with somewhat smaller but if you're going to the trouble of correcting it... Why not double up 6mm 2 if that's easier? |
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Post by canaldweller on Nov 3, 2016 18:02:37 GMT
We have a Waeco Coolmatic CR-110. Have just checked for volt drop and it is 0.43v. The voltage (fridge off) is 12.9v and (switched on) 12.47v. It is 8 metres from fridge to batteries. The manual says, for this length, it should be 12mm 2 . Does this sound right? I ask because it could be a problem getting that size cable through the boat. Yup, afraid that's right. You could probably get away with somewhat smaller but if you're going to the trouble of correcting it... Why not double up 6mm 2 if that's easier? Thanks for that. To be honest I'm not even sure what 12mm cable looks like so I may be fussing over nothing. Shall look at what it looks like and, if it looks too big, go for your double up option. We've had the fridge for well over 5yrs and, the only reason I've checked for volt drop is someone (Smiley Pete?) recently said that too much volt drop was bad for the batteries. |
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Post by Telemachus on Nov 3, 2016 18:09:02 GMT
It's not really bad for the batteries, but it does waste power. The fridge will just take more current to make up for the voltage drop, that means more charge taken out of the batteries.
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Post by tonyqj on Nov 3, 2016 18:10:37 GMT
Yup, afraid that's right. You could probably get away with somewhat smaller but if you're going to the trouble of correcting it... Why not double up 6mm 2 if that's easier? Thanks for that. To be honest I'm not even sure what 12mm cable looks like so I may be fussing over nothing. Shall look at what it looks like and, if it looks too big, go for your double up option. We've had the fridge for well over 5yrs and, the only reason I've checked for volt drop is someone (Smiley Pete?) recently said that too much volt drop was bad for the batteries. Well, it's only bad for the batteries inasmuch as you're wasting power. Any voltage drop is due to warming the cable up which is pure waste. |
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Post by faffer on Nov 3, 2016 18:11:16 GMT
Yup, afraid that's right. You could probably get away with somewhat smaller but if you're going to the trouble of correcting it... Why not double up 6mm 2 if that's easier? Thanks for that. To be honest I'm not even sure what 12mm cable looks like so I may be fussing over nothing. Shall look at what it looks like and, if it looks too big, go for your double up option. We've had the fridge for well over 5yrs and, the only reason I've checked for volt drop is someone (Smiley Pete?) recently said that too much volt drop was bad for the batteries. a good place to look at www.12voltplanet.co.uk/cable.html |
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Post by tonyqj on Nov 3, 2016 18:11:24 GMT
Aww drat, I've gone and agreed with Nick again.
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Post by Telemachus on Nov 3, 2016 18:12:07 GMT
Aww drat, I've gone and agreed with Nick again. But I can type faster... |
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Post by Gone on Nov 3, 2016 19:20:07 GMT
Yup, afraid that's right. You could probably get away with somewhat smaller but if you're going to the trouble of correcting it... Why not double up 6mm 2 if that's easier? Thanks for that. To be honest I'm not even sure what 12mm cable looks like so I may be fussing over nothing. Shall look at what it looks like and, if it looks too big, go for your double up option. We've had the fridge for well over 5yrs and, the only reason I've checked for volt drop is someone (Smiley Pete?) recently said that too much volt drop was bad for the batteries. 2.5mm2 cable has a core diameter of almost 2mm 6mm2 has a core diameter of 2.8mm 10mm2 has a core diameter of 3.6mm 16mm2 has a core diameter of 4.5mm So we are not talking about massive cables here. Add about 3mm for the insulation. |
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Post by tonyqj on Nov 3, 2016 20:15:31 GMT
Thanks for that. To be honest I'm not even sure what 12mm cable looks like so I may be fussing over nothing. Shall look at what it looks like and, if it looks too big, go for your double up option. We've had the fridge for well over 5yrs and, the only reason I've checked for volt drop is someone (Smiley Pete?) recently said that too much volt drop was bad for the batteries. 2.5mm2 cable has a core diameter of almost 2mm 6mm2 has a core diameter of 2.8mm 10mm2 has a core diameter of 3.6mm 16mm2 has a core diameter of 4.5mm So we are not talking about massive cables here. Add about 3mm for the insulation. Did you use Mr Pie for that? |
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Post by Gone on Nov 3, 2016 22:12:12 GMT
2.5mm2 cable has a core diameter of almost 2mm 6mm2 has a core diameter of 2.8mm 10mm2 has a core diameter of 3.6mm 16mm2 has a core diameter of 4.5mm So we are not talking about massive cables here. Add about 3mm for the insulation. Did you use Mr Pie for that? Yep, though I could have used Mr Google instead. |
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