Re: Battery charging with intermittant power source
- From: Jan Panteltje <pNaonStpealmtje@xxxxxxxxx>
- Date: Sat, 10 Jan 2009 11:02:08 GMT
On a sunny day (Fri, 9 Jan 2009 17:19:12 -0800 (PST)) it happened
"miso@xxxxxxxxx" <miso@xxxxxxxxx> wrote in
<eee196ea-c924-47f7-bde8-575098a4eadd@xxxxxxxxxxxxxxxxxxxxxxxxxxx>:
Any particular reason why you just don't buy a charge controller?
For an intermittent source, you need to insure your load is serviced
by undervoltage lockout hardware. I bought some surplus NEMA box
basically for the box, i.e. not what is inside. However, the box
contents were instructional since I've never built this kind of
outdoor gear for a living. The box had a DSC LBCM. DSC is the company,
Digital Security Controls. LBCM stands for Low Battery Cutoff Module.
I haven't tracked down a manual, though the thing is just a relay and
a dozen discretes on a two layer board. Certainly reverse
engineerable. Presumably they limit the battery to a minimum of 10V.
Exactly.
I just did one, there is a flashing alarm when the battery drops below 10.7 V,
and a switch off, using power MOSFET, when 10.0 V is reached, also with alarm.
There is current limit and voltage limit on the charger.
There also a a time limit on the charge (24 h for sealed lead acids).
Also the Ah hours is calculated from the current.
I guess I could make some assumptions, and limit charge on Ah hours too,
but then would need to monitor temp as well.
You can get as sophisticated as you want with a PIC :-)
.
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