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Author Topic: Battery monitor  (Read 1247 times)
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« on: December 25, 2012, 01:05:36 PM »

I have just downloaded & installed a prog called battery bar V3.5.5 on to my & my partners laptops (different makes).

As soon as it was running it was able to tell me that my battery had 23.7% wear from its original status & what its new actual capacity was. For my partner it recognised that it was a new battery & had only lost 0.6% whilst in storage (it arrive at 80% SOC).

That made me wonder if it was possible to apply what ever it does to other batteries / systems. However I also wondered how much if its info was dependant on the hardware in the laptop.

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« Reply #1 on: December 29, 2012, 06:10:33 PM »

However I also wondered how much if its info was dependant on the hardware in the laptop.

Thats certainly probable as any monitor just taking a voltage reading without measuring the voltage vs load over a significant amount of time and through several charging / discharging cycles are unlikely to be accurate.

My Sunny Island gives both State of Charge (SOC) and State of Health (SOH) of my battery bank.

SOC is a simple % charge of the battery along with a % of uncertanty which gets larger if the batteries dont get a full charge for a while. It does this by counting Ah's in and out of the battery but also re-calculates occasionally by measuring the voltage verses load if the battery has been under a constant load for a long time. It also seems to reset itself at 100% if the batteries have been given a really good charge.

SOH gives an estimate of the current capacity (when full charged) as a percentage of the original capacity of the batteries as manually entered (in Ah's @ C10) when the batteries were new. The manual says it needs several cycles to give an accurate reading of this. Interestingly this has only been as high as 96% even when my batteries were new but this could be because I had to make an estimate of capacity @ C10 as I only had the spec @ C20. After 7 months of use the reading is currently 95% so a loss of only 1% during this time is quite reassuring for me.
« Last Edit: December 29, 2012, 06:13:47 PM by nowty » Logged

12kW+ of PV installed and 57+ MWh's generated.
Home battery storage of 50+ kWh's.
Hot water storage of 15+ kWh's.
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EV BMW i3 (another 30+ kWh's of storage).
270,000+ litres of water harvested from underground river.
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