Thanks. I feel better now. :-)
But I've also discovered another 12 volt SLA battery that's gone bad...
the 2.3 AH one used in my Quantum Turbo clone. But I think this one is
truly toast. It measures about 6.4 volts and doesn't cause the charge
amp meter on the auto charger to even twitch when connected.
Fortunately, it's just a Panasonic VHS style camcorder battery and
they're not very expensive.
Chuck Norcutt
Jez Cunningham wrote:
> Just doing a few back-of-envelope calculations for fun...
> Two Bees at 360Ws = 720Ws
> They recharge in 3s so they draw 720/3=240W - at 12V that's 20A
> Now take some guesses at efficiency of the inverter and the Bees, say 80%
> each and now we're approaching an average 30A. But they'll charge
> exponentially such that the AVERAGE is 30A, starting with an initial peak
> that will be several times larger (limited by the internal resistance of the
> battery, the connecting leads and the inverter circuitry) and decaying
> towards zero.
>
> It's gonna be hard to test what the battery could deliver: a 55W headlamp
> bulb will take 4-5A so you'd need quite a bank of them to load it at
> 30-100A!
>
> I think your tests show it's not in bad shape, but having the spare is
> always good!
>
> Jez
>
> On Fri, Sep 18, 2009 at 12:51 PM, Chuck Norcutt <
> chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>
>> I finally checked the specs on the
>> inverter and found that the low voltage warning is issued at 10.5 volts
>> so obviously the two lights (which, together, recycle in about 3 seconds
>> from a full dump) are putting a large drain on the battery and drawing
>> the voltage way down.
--
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