Friday, July 25, 2008
Questions & Answers from the Weekly Tips section at all-battery.com...
The following, within quotes, is one of the Questions & Answers from the Weekly Tips section at all-battery.com...
"I am confused about the 28 volt airplane systems. Do they use 28 volt batteries?
Cars and trucks and other ground-based equipment traditionally use the "2 volt per cell" terminology. For example a 6 cell battery is a 12 volt battery even though the open circuit voltage is 12.9 volts and the charging voltage can be above 14 volts. This is because the "average" voltage as a lead acid battery is discharging is about 2 volts per cell.
Aircraft have used a different standard. They typically quote the alternator voltage rather than the battery voltage. This make sense because (even for ground equipment) most of the time the system is running at the alternator voltage, the battery itself never gets discharged very much. The alternator voltage is nominally 13.8 volts for a "6 cell" system and 27.8 volts for a "12 cell" volt system. This is typically rounded to 14V and 28V.
Therefore a 28 volt aircraft electrical bus will have a 24 volt lead acid battery in it.
So the answer is "No, 28 volt aircraft use 24 volt batteries.""
~~
"I am confused about the 28 volt airplane systems. Do they use 28 volt batteries?
Cars and trucks and other ground-based equipment traditionally use the "2 volt per cell" terminology. For example a 6 cell battery is a 12 volt battery even though the open circuit voltage is 12.9 volts and the charging voltage can be above 14 volts. This is because the "average" voltage as a lead acid battery is discharging is about 2 volts per cell.
Aircraft have used a different standard. They typically quote the alternator voltage rather than the battery voltage. This make sense because (even for ground equipment) most of the time the system is running at the alternator voltage, the battery itself never gets discharged very much. The alternator voltage is nominally 13.8 volts for a "6 cell" system and 27.8 volts for a "12 cell" volt system. This is typically rounded to 14V and 28V.
Therefore a 28 volt aircraft electrical bus will have a 24 volt lead acid battery in it.
So the answer is "No, 28 volt aircraft use 24 volt batteries.""
~~
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A Digital LCD Display Universal Charger for only $19.99 with $10 instant discount code "T6278" and several other hot products have 20% off code this week.
Digital LCD Display Universal Smart Charger /Combo from $19.99 --support AA/AAA/C/D/9V
$10 Instant Discount with code "T6278"
Powerful Li-ion 18650 Battery packs 6600mAh Capacity --Specials!
20% off with code "T0721"
Li-Ion 18650 3.7V 2200-2600mAh Rechargeable Batteries with build-in PCBs excellent for flashlights
20% off with code "T0721"
Tenergy Propel Sub C Sc 4500mAh 10C-20C NiMH Rechargeable battery with Tabs
Low Price $5.11/each with code "T0721"
$10 Instant Discount code "T6278" for 6278 Series Cahrgers
20% off of certain items -- 20% off code "T0721", expires July 31
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