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pricey
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sean Downsizer Moderator
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NeathChris
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Cathryn
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Rob R
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bingo
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dougal
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Blacksmith
Joined: 25 Jan 2005 Posts: 5025 Location: Berkshire
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dougal
Joined: 15 Jan 2005 Posts: 7184 Location: South Kent
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Posted: Tue Mar 04, 08 8:57 pm Post subject: |
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Quote: |
So, do I need a 30 amp/hour battery for 10 hours running ? |
Yes - or rather, at least that, plus a bit...
Lead/acid batteries generally don't like being drained flat. Everytime you do it, you lose a bit of capacity.
"Leisure" batteries are a bit better able to put up with the abuse of being drained flat-ish.
"Traction" batteries (as used on 'mobility scooters' and such) are even better - but even more expensive!
Ordinary car batteries don't like going flat AND they are primarily designed to deliver a brief (but massive) current to the starting motor - rather than a steady (lower) load.
The amp hour rating varies depending on the rate of discharge. The manufacturer might even have a curve to define the relationship. Generally, the slower you drain it, the more you get out! 30 amp hour @ 1 amp might be less than 20 amp hours at 3 amp discharge rate.
So, I'd go for something like a 40 amp hour leisure battery, AND probably carry an old (but charged) car battery just in case you needed 'a little bit more' - being professional means being prepared! With some jump leads on board, the prime battery could be topped up a bit while the clunker keeps things moving for a few minutes...
And for transport, you should have the batteries solidly secured... and the terminals insulated... |
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Blacksmith
Joined: 25 Jan 2005 Posts: 5025 Location: Berkshire
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resistance is fertile
Joined: 24 Oct 2008 Posts: 1534 Location: The heart of North Devon
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Blacksmith
Joined: 25 Jan 2005 Posts: 5025 Location: Berkshire
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