deep battery discharge [RE-wrenches]

[Allan Sindelar]

Ron,
Not certain, but you may need a higher voltage to "wake up" the SB50.
Certainly the batteries will accept a charge. Try bypassing the SB (both +
and -) and leave it that way until voltage rises.

Also, a single SB50 is a poor choice in this situation, as it can't handle
750 watts at 12V. Blue Sky suggests a maximum of 40A input, as that allows a
20% boost to 50A output, and current is limited to 50A output at whatever
battery voltage you have. 50A at 12V is 600W of array. Any more than that is
only going to help in early/late charging hours and overcast skies. I don't
know the degree of overcurrent protection built into the controller; it may
have been damaged by consistent overloading. Try bypassing the input
directly to the batteries, while leaving the battery connection in place; if
it doesn't wake up after the voltage rises, it may be the toast.

At a C/30 rate (750/12 = 62.5; 1900/62.5 = 30), his array is too small for
those batteries anyway. It can't fill them completely or equalize them.

Allan at Positive Energy

----- Original Message ----- 
From: "Ron Young" <solareagle at solareagle.com>
>
> Hi all,
> I've got a client who inadvertently discharged his relatively new set
> of 1900 a/h lead acid batteries (left a light on that was directly
> wired for about three weeks). The voltage reading is 10.5v, I can't
> even get a reading on a hydrometer so it looks like the electrolyte is
> pretty much water. The 750 watt 12v array is only registering .4 amp in
> bright sun -through an SB50L -is this because the batteries can't
> accept a charge now? Are they toast or can they be recovered?
>


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