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From: Robin Brueckner (no email)
Date: Sat Feb 02 2008 - 16:20:14 EST
"..So, the refinement I would like to implement is a faster charge, since my
new AGMs can take it. Not sure how best to do that...."
To charge AGM's faster, you need to either run like chargers/regulators in
parallel or charge different AGM banks from different chargers. Of course you
can always ditch the existing charger and double or triple it's size with a
single new one.
If you try to run different (brand) chargers together, in parallel, it's very
likely one will take over and suppress the other....Some work together, some
don't.
So adding another charger/regulator of the brand you now use is a logical
choice...you can always query the manufacturer to see if they work well in
parallel.
I run three Statpower 40 AMP chargers in parallel and they work well
together...only at the final stage of charging does one take over a
bit...which is fine...Arild noted in past posts that Xantrex has tested two in
parallel, not three, but I have found they work ok.
If I run the three Statpowers and a 130 AMP Freedom (Also Xantrex)
charger/inverter ALL together, 250 amps theoretical maximum, I sometimes get
to 170 maybe 190 or so amps briefly but my wet cells don't need that for
long...I don't let them get below about 50% maximum discharge....these
different units work together "bulking" ok but after perhaps twenty minutes
the Freedom begins to suppress the three Statpowers....I run my gen no more
than an hour daily to run a refrigerator, a bit over an hour when running a
frig plus a separate freezer on a second compressor.
I have six 8D's charging..in theory I designed for: 20% x 6 x 220 amp hours or
264 amps amps maximum bulk charge. (I figured 250 was close enough.) In fact,
they never take that 250 amps max ...maybe if I discharged them considerably
more they would, but that's not good for battery life. (Now I read wetcells
might take 25% but that seems unnecessarily high to me.)
No one should HAVE to run a genny FOUR hours daily for battery charging unless
they are powering a BIG, BIG frig and freezer in tropical temperatures along
with other accessories. Either the battery bank is too small, the batteries
old and tired, or your charging system is undersized. For occassional use
perhaps it's not worth the trouble and expense to fix; for frequent travelers
away from dockside, it's a worthwhile upgrade.
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