[C320-list] interstate SRM-4D Batteries

[Graeme Clark]

Danny

You can buy a low voltage cut-out - they are very common in auto-applications such as vehicles with ancillary electrical services such as a tail-lift to prevent run down of the battery.  I believe the fridge auto cuts out at about 10.? V but thats too late to protect your battery.

Google low voltage disconnector and look in ‘shopping’ results. Purpose made units or ones you can get from eBay where you cans et the voltage.

I was told never to discharge below 50% which is approx. 12.2v; however that is steady state voltage-  if the current is being drawn when voltage is being measured you  will get a much lower reading. I guess I’d set it to about 11.8v maybe if I had one, but that is a guess - others may know better

Graeme
#366, Jaskar
On 8 Sep 2015, at 17:30, danny jensen <danny at jensenshouse.com> wrote:

> Dear Group,
> I just killed off a set of interstate SRM-4D Batteries after about 4 years.
> It is very likely I caused these to die after a ran them down to 0 when I
> lost shore power and had my refrigerator on. Also I believe one battery had
> low water and it looked like the battery was deformed during charging.
> 
> I have been running a balmar 100A alternator / MC-614 regulator an pulling
> about 75A at anchor. Normal running it is configured in small engine mode
> pulling max 35A. My balmar MC-614 has temp sensors on one of the batteries
> the 2 SRM-4D are wired in parallel making one 268AH (234 x 2 per Warren's
> Calc's). I have a xantrex link lite battery monitor and never take the
> batteries down more than 80 percent ( one should use Warrens calculation
> -5% first year and -3% thereafter). I shore charge with a xantrex 40A
> charger. I spend 5 night offshore 10 times a year.
> 
> The batteries started their life as 2 separate banks of 268 batteries then
> I joined them in parallel 2 years ago on my boat rewire project per Jeff's
> notes. My guess is that one battery failed and killed the other battery in
> parallel. Maybe I abused on battery before I paralleled them?
> 
> I was able to install these myself. But I was at my limit.
> 
> Question:
> 1. Is 4 years reasonable for flooded batteries
> 2. Is there some sort of smart breaker I can apply to my Adler-Barbour
> refrigerator
> to idot proof not running my refrigerator when my batteries are say less
> than 12.2vdc.
> 3. I'm running Bulk charging for at 14.4 volts for at least 1 hours under
> from by balmar. Much has been written about this topic so I just like to
> get your take on this Warren, Jeff... others
> 
> Battery Supplier for Interstate SRM-4D:
> General Truck Supplies
> Cost : $445 each
> Next day delivery to store
> 1515 Anaheim Street
> Wilmington, CA 90744
> 310 952-1040
> 
> Danny
> #972