### Specific Gravity

A lead acid battery will have a ration of sulfuric acid and water as the electrolyte. The process of charging forces any sulfate from the battery plates back to the electrolyte which increases it's specific gravity. The specific gravity of pure water is set at 1. By dissolving substances in water makes if heavier per volume. The common amount of acid brings electrolyte specific gravity (SG) to 1.128 approx.

Measuring the SG with a hydrometer can show if the acid is in the plates and they are sulphated.

The two times this would occur is a) in the normal process of discharging and b) in the longer term build up of sulphated plates that do not respond to a normal charge and the battery is termed 'sulphated'

The SG will also vary on the level of electrolyte as the water evaporates. As water evaporates the SG increase along with ration of acid to water. Adding water will lower the SG and show the battery is not as fully charged as it may seemed when the electrolyte was lower than the designed level.

### 02|February

ML>12.69 or Y>1.23K | ML<12.63 or Y<320 | ML<12.39 or Y<199

**28th February**:: ML V=12.52 :: Y=520Wh

**27th February**:: ML V=12.55 :: Y=1.79KWh

**26th February**:: ML V=12.52 :: Y=1.80KWh

**25th February**:: ML V=12.38 :: Y=1.74KWh Left router on all night ??

**24th February**:: ML V=12.54 :: Y=1.58KWh

**23rd February**:: ML V=12.50 :: Y=1.46KWh

**22nd February**:: ML V=12.50 :: Y=1.23KWh

**21st February**:: ML V=12.52 :: Y=1.18KWh

**20th February**:: ML V=12.52 :: Y=360Wh

**19th February**:: ML V=12.37 :: Y=930Wh

**18th February**:: ML V=12.51 :: Y=1.02KWh

**17th February**:: ML V=12.44 :: Y=530Wh

**16th February**:: ML V=12.48 :: Y=150Wh

**15th February**:: ML V=12.44 :: Y=980Wh

**14th February**:: ML V=12.56 :: Y=1.58KWh

**After 9 weeks topped up batteries:** None of the plates were exposed but did use the best part of 5Lt

**EQUALIZING**By setting Absorption and Float to 16v

**EQUALIZING**Although ABS set at 15.64 which was reached around 9:30am by 13:00 v has dropped to <15.4 though set at 16v. Again I am inclined to consider resistance is dropping and undoing some of the sulfation

**13th February**:: ML V=12.51 :: Y=670Wh

Although I reset the mppt after midnight it created two records by 09:20 so I reset it again and noted the ML and consumption

**12th February**:: ML V=12.64 :: Y=220Wh

Updates and Firmware updates were carried out between 16:30 and 16: 50 and there was no recorded yield since.

The values in both columns headed today and yesterday are those of the 12th. I will be resetting the datafile soon to avoid visual errors.

**11th February**:: ML V=12.64 :: Y=610Wh

**10th February**:: ML V=12.43:: Y=830Wh

**9th February**:: ML V=12.43:: Y=550Wh

**8th February**:: ML V=12.52:: Y=160Wh

**7th February**:: ML V=12.50:: Y=760Wh

**6th February**:: ML V=12.63:: Y=750Wh

**5th February**:: ML V=12.63 :: Y=100KWh

**4th February**:: ML V=12.65 :: Y=560Wh

**3rd February**:: ML V=12.54 :: Y=890Wh

**2nd February**:: ML V=12.67 :: Y=1.17KWh

**1st February**:: ML V=12.62 :: Y=410Wh### 01|January

ML>12.69 or Y>1.23K | ML<12.63 or Y<320 | ML<12.39 or Y<199

**31st January**:: ML V=12.55 :: Y=60Wh

**30th January**:: ML V=12.51 :: Y=940Wh

**29th January**:: ML V=12.55 :: Y=100Wh

**28th January**:: ML V=12.56 :: Y=870Wh

**27th January**:: ML V=12.62 :: Y=700Kw

**26th January**:: ML V=12.51 :: Y=160Wh

**25th January**:: ML V=12.60 :: y=460Wh

**24th January**:: ML V=12.60 :: Y=130Wh

**23rd January**:: ML V=12.48 :: Y=570Wh

**22nd January**:: ML V=12.64 :: y=170Wh

**21st January**:: ML V=12.54 :: Y=570Wh

**20th January**:: ML V=12.60 :: Y=450Wh

**19th January**:: ML V=12.39 :: Y=720Wh

**18th January**:: ML V=12.48 :: Y=40Wh

**17th January**:: ML V=12.46 :: Y=1.10KWh

**16th January**:: ML V=12.52 :: Y=200Wh

**15th January**:: ML V=12.52 :: Y=220Wh

**14th January**:: ML V=12.52 :: Y=230Wh

**13th January**:: ML V=12.52 :: Y=280Wh

**12th January**:: ML V=12.56 :: Y=190Wh

**11th January**:: ML V=12.55 :: Y=250Wh

**10th January**:: ML V=12.46 :: Y=750Wh

**9th January**:: ML V=12.48 :: Y=1.25KWh

**8th January**:: ML V=12.42 :: Y=700Wh

**7th January**:: ML V=12.39 :: Y=160Wh

**6th January**:: ML V=12.54 :: Y=60Wh

**5th January**:: ML V=12.55 :: Y=180Wh

**4th January**:: ML V=12.39 :: Y=570Wh

**3rd January**:: ML V=12.43 :: Y=110Wh

**2nd January**:: ML V=12.48 :: Y=400Wh

**1st January**:: ML V=12.30 :: Y=460Wh### 12|December

[b]Legend:[/b]

If ML<12.63 or Y<320 then background is

If ML<12.36 or Y<199 then background is

**31st December**:: ML V=12.32 :: Y=50Wh

**30th December**:: ML V=12.36 :: Y=120Wh

**29th December**:: ML V=12.39 :: Y=60Wh

**28th December**:: ML V=12.55 :: Y=120Wh

**27th December**:: ML V=12.40 :: Y=800Wh

**26th December**:: ML V=12.31 :: Y=400Wh

**25th December**:: ML V=12.34 :: Y=80Wh

**24th December**:: ML V=12.40 :: Y=70Wh

**23rd December**:: ML V=12.46 :: Y=80Wh

**22nd December**:: ML V=12.39 :: Y=430Wh

**21st December**:: ML V=12.48 :: Y=80Wh

**20th December**:: ML V=12.48 :: Y=490Wh

**19th December**:: ML V=12.40 :: Y=430Wh

**18th December**:: ML V=12.39 :: Y=10Wh !!!!!!!!

**17th December**:: ML V=12.30 :: Y=250Wh

**16th December**:: ML V=12.50 :: Y=60Wh

**15th December**:: ML V=12.52 :: Y=20Wh !!!!!!!!

**14th December**:: ML V=12.23 :: Y=220Wh

**13th December**:: ML V=12.43 :: Y=90Wh

**12th December**:: ML V=12.48 :: Y=100Wh

**11th December**:: ML V=12.48 :: Y=140Wh

**10th December**:: ML V=12.51 :: Y=420Wh

**9th December**:: ML V=12.51 :: Y=730Wh

**8th December**:: ML V=12.52 :: Y=70Wh

**7th December**:: ML V=10.01 :: Y=690Wh

**6th December**:: ML V=11.30 :: Y=30Wh !!!!!!!!

**After 12 weeks topped up batteries:** Topped up is not the right word as all cells were bad. Hardly a few had fluid above plates and many needed over 200ml added. Luckily it had rained !_O_!

**5th December**:: ML V=12.54 :: Y=30Wh

**4th December**:: ML V=12.74 :: Y=220Wh

**3rd December**:: ML V=12.51 :: Y=480Wh

**2nd December**:: ML V=12.48 :: Y=60Wh

**1st December**:: ML V=12.64 :: Y=100Wh### 11|November

**30th November**:: ML V=12.71 :: Y=950Wh

**29th November**:: ML V=12.50 :: Y=290Wh

**28th November**:: ML V=12.44 :: Y=40Wh

**27th November**:: ML V=12.67 :: Y=80Wh

**26th November**:: ML V=12.75 :: Y=990Wh

**25th November**:: ML V=12.40 :: Y=490Wh

**24th November**:: ML V=12.70 :: Y=80Wh

**23rd November**:: ML V=12.82 :: Y=460Wh

**22nd November**:: ML V=12.55 :: Y=550Wh

**21st November**:: ML V=12.51 :: Y=490Wh

**20th November**:: ML V=12.63 :: Y=740Wh

**19th November**:: ML V=12.66 :: Y=330Wh

**18th November**:: ML V=12.39 :: Y=1.09KWh

**17th November**:: ML V=12.52 :: Y=750Wh

**16th November**:: ML V=12.71 :: Y=180Wh

**15th November**:: ML V=12.64 :: Y=220Wh

**14th November**:: ML V=12.66 :: Y=420Wh

**13th November**:: ML V=12.79 :: Y=620Wh

**12th November**:: ML V=12.79 :: Y=360Wh

**11th November**:: ML V=12.83 :: Y=640Wh

**10th November**:: ML V=12.26 :: Y=270Wh

**9th November**:: ML V=12.86 :: Y==200Wh

**8th November**:: ML V=12.66 :: Y=260Wh

**7th November**:: ML V=12.66 :: Y=450Wh

**6th November**:: ML V=12.87 :: Y=200Wh

**5th November**:: ML V=12.85 :: Y=290Wh

**4th November**:: ML V=12.87 :: Y=160Wh

**3rd November**:: ML V=12.91 :: Y=130Wh

**2nd November**:: ML V=12.71 :: Y=410Wh

**1st November**:: ML V=12.74 :: Y=1.34KWh### Victron MPPT 75|15