Saturday, Mar 07, 2009 at 10:33
Rick
using your own "idea" it makes sense to use a 620 CCA Exide Extreme, they (as do many batteries) have their plates 'locked' at top and bottom too. They have an excellent 2 year warranty, but this drops to only 6 months when used as a 'cycling' battery, reason being they as also your 600 CCA Marine cranking battery are not designed for the heavy use associated with running a fridge, the plates are different as is the chemical compound.
As you say you have posted "your ideas" however I would suggest there would not be one *qualified* person or company that will recommend in writing, using a Cranking battery over a Deep Cycle battery to power a high drain product like a fridge on a long term basis as when on a holiday.
Yes, for sure on the weekend away, where the vehicle is constantly used it will work, because the battery will be constantly charged, cranking batteries won't take being discharged as low as DC's will,
when the owner takes his vehicle away for a few weeks holiday and does not drive it for most of the time, he will be facing ruining a good cranking battery simply because of sulphation of the plates due to the constant low discharge by the fridge.
Yes a battery cut-out device will disconnect the fridge from the battery when it gets to this position so the battery is not constantly damaged, but the food is spoiled because the battery is disconnected from the fridge.
I've previously searched and can't find any battery retailer/manufacturer website that recommends Cranking batteries over DC's for running high drain products like a fridge on long term basis!
If I've missed one somewhere, I expect it will show up here and I will stand corrected.
Mainey . . .
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