Most folks point out that SLA batteries are best *not* drawn down to
their bottom. I'm thinking of using newer LiFePO4 batteries. What's the
draw-down limit, if any, on these items?
...robert
On 6/15/2013 14:06, Michael Babineau wrote:
*Robert : *
*
*
*If you are planning to use Lead-Acid technology (SLA or wet-cell )*
*then, as others have suggested, you should double your calculated
capacity, as you never want*
*to drain a Lead-Acid battery by more than 50% ..*
*
*
*so *
*
*
*10 hr requires 7 Ah*
*20 hr requires 15 Ah *
*etc.*
*
*
*The reality is that you will probably spend somewhat more than 50% of
the time listening and tuning around*
*for stations when you are S&P so the real split may be more like 30% TX
and 70% RX, but 50/50 is probably*
*a good guess. *
*
*
*One further point .. don't discharge a Lead acid battery below 10.5 v.
Repeatedly doing this will shorten*
*its lifespan. Don's suggestion of setting the low voltage indication
on the K2 to 11v is a good idea.*
*
*
*For picnic-table-portable operations, battery booster packs (intended
to jump-start cars) work very well*
*and it is easy to find one with an SLA in the 10Ah to 20Ah range, often
on sale. You can take the plastic*
*case apart to install some fusing and even powerpole connectors to
customize it for your application*
*(I also removed the jumper cables from mine). Some of these packs now
even come with USB ports to allow for impromptu *
*powering/charging of i-Devices. It is often cheaper to buy one of
these than to purchase just the equivalent capacity SLA*
*battery .. so you get a nice carrying case with a handle and other
goodies for free. *
*
*
*Best of luck ...*
*
*
*Michael VE3WMB *
--
Robert G Strickland, PhD ABPH - KE2WY
[email protected]
Syracuse, New York, USA
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