[C320-list] Batteries Volts

[Greg Flanagan]

Just a caution. Estimating state of charge by voltage is very dicey. You either need a proper amps in/amps put gauge or something like the Smartgage to accurately measure SOC. The former is a complicated install and needs periodic recalibration. An example: I have been anchored in Squirrel Cove, Desolation Sound for three days. Yesterday SOC was 80% and voltage was 12.9. This morning SOC is 75% and voltage is 12.7.  


Greg 

Hoop Dancer #1076

> On Jul 6, 2017, at 1:17 AM, Graeme Clark <cg at skyflyer.co.uk> wrote:
> 
> 12.8v would be about fully charged and 12.2v represents 50% but these voltages need to be measured when there has been no load on the battery for a good 15 minutes or so.
> Even a small load will quickly drag the voltage down (temporarily)
> 
> Graeme
> 
> Sent from mobile: please excuse typos etc.!
> 
> 
>> On 5 Jul 2017, at 23:30, Greg Flanagan <greg.flanagan at shaw.ca> wrote:
>> 
>> 12.5 sounds low. My float voltage is 13.3. 
>> I use the Balmar Smartgauge. Pricey but easy to install and sophisticated enough to adapt to battery ageing. Shows capacity as percentage and voltage for main battery and voltage for the starter battery. 
>> 
>> Hoop Dancer #1076
>> Greg Flanagan 
>> Sidney, BC 
>> 
>>> On Jul 5, 2017, at 3:18 PM, Ted Harrison <tharrison at innovations-plus.com> wrote:
>>> 
>>> Two new 4 d batteries installed in parallel. 
>>> 
>>> Each battery has a positive cable to the charger. The charger is a ProMariner 12 / 30 P
>>> 
>>> Charged for the first time last night. It went through conditioning mode, then charging mode and now sits at ready mode. 
>>> 
>>> Have not install the battery monitor nor the echo  trickle charger for the starter battery. Starter battery sitting on shelf ready to connect. 
>>> 
>>> What volts should the batteries read ? Currently they read 12.5 on the volt meter.
>>> 
>>> What battery monitor system would you recommend? 
>>> 
>>> Thanks for all your help to get me this far on my project. 
>>> 
>>> Ted Harrison
>>> Hull 424
>