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Charge & Lighting Controllers | 34 SES Flexcharge Solar Single or Dual Battery Charge Controllers | 35 Thin-Lite ballast replacement installation guide | 36 Solar Converters Special Solar and Battery Charging Equipment | 37 TriMetric Battery System Monitors and Deltec Co. shunts | 38 Timers,Linear Current Boosters,Photoswitch,Voltage Controlled Switches | 39 Battery Desulphator by Solar Converters, Inc. | 40 Solar Converters, Inc. 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Lighting Tips | 55 Your On-Line Privacy | 56 Electric Vehicle and Alternative Energy Battery Disconnects | 57 Power Distribution & Splicer Blocks | 58 Cable and Butt Splices & Connectors | BATTERY POST & TERMINAL CONNECTIONS, ADAPTERS AND BATTERY ACCESSORIES | 59 Battery Post Marine Conversions & Terminal Extensions | 60 Battery Post Connectors Conversions Adapters Repair | 61 Battery Terminal & Post - Cable Lug Covers & Protectors | 62 Heat Shrink Tubing & Cable Lugs by QuickCable | 63 Compression Connectors - Lugs | 64 Heavy Duty Cast Copper Connectors - Lugs | 65 Copper Connectors - Lugs by Quick Cable - MAX | 66 Magna Lug Heavy Duty & Fusion Lugs by QuickCable | 67 Anderson SB Connectors | 68 Anderson SB Connector Accessories | 69 Anderson SB Connector Parts | 70 Thin-Lite LED and Fluorescent Comparisons | 71 Overview of Our Photovoltaic Systems | 72 Iota Engineering Battery Chargers / Converters | 73 SAE Connectors, Plugs, Sockets & Cords | 74 Electric Vehicle Power Supplies Converters by IOTA Engineering | 75 DC to DC Voltage Converters & Dimmers by Solar Converters | 76 Universal Generator Starter switch by Solar Converters | 77 Stranded vs Solid Wire in low voltage systems | 78 IOTA Engineering Power and Lighting products | 79 open page | 80 Wire & Cable Gauges and Information | 81 TriMetric 2030 and SC-2030 Wiring Layout | 82 DC to DC Voltage Converters | 83 TriMetric 2030 Battery Monitor Features | 84 IOTA Engineering DLS Battery Charger Features | 85 Lighting Systems | 86 Practical Alternative Energy Applications | 87 Portable and Emergency Power Systems | 88 Custom Cables | 89 Our Customers Systems | 90 Resources for Disaster & Emergency Preparedness | 91 PowerMax Transfer Switch Views and Schematics | 93 | 94 Battery Wiring Diagrams | 95 Battery Condition and State of Charge Charts | 96 Order Form | 97 Backup Power? | 98 Energy Expectations | 99 Power Needs Worksheet | 100 Efficiency | 101 Wire Loss Chart | 102 Solar Insolation Map / Chart | 103 Utility Inter-tie | 104 About Us | 105 Statement of Policy & Warranty/Returns | Contact Us | MPPT Charge Controllers - FAQ | Battery Equalizer/DC Autotransformers - FAQ | Constant Voltage Pump Drivers - FAQ | Linear Current Boosters - FAQ | Information | 1 | 2 | 3 | 4 | 5 | 6 | 7 | NEWS-info links | Home Power Articles | R | P | A | B | C | D
95 Battery Condition and State of Charge Charts
Always wear eye protection when working
near batteries.
Even a small battery stores a great deal of
energy which can be released during a
short circuit.
The electrolyte contained in batteries is
corrosive.
The following information is courtesy of Ralph Heisy of
Bogart Engineering.
Battery voltage will vary for the same state-of-charge depending on whether
the battery is being charged or discharged and what the current flow is in
relation to the size of the battery.
The chart below will give you an idea of state-of-charge for various battery
conditions in flooded cell lead-acid batteries.
Voltage varies with temperature.
While charging, a lower temperature will increase battery voltage.
Full charge voltage on a 12 volt battery is 0.9 volts higher at 32 deg. F.
While discharging, a higher temperature will increase battery voltage.
There is little temperature effect while a battery is standing.
The following information is courtesy of
AEE Solar.
A hydrometer is very accurate at measuring battery state-of-charge if you measure
the electrolyte near the plates.
Unfortunately, you can only measure the electrolyte at the top of the battery.
When a battery is being charged or dis-charged a chemical reaction
takes place at the border between the lead plates and the electrolyte.
During charging the electrolyte changes from water to sulphuric acid.
The acid becomes stronger and the specific gravity rises as the battery charges.
Near the end of the charging cycle gas bubbles rising through the acid stirs the
fluid to mix it.
It takes several hours for the electrolyte to mix so that an accurate reading can
be taken at the top of the battery.
Always try to take readings after a period of no charge or no discharge.
