Loadsharing
07-03-2003 | 07:11 AM
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From: Trondheim, NORWAY
Loadsharing
Dear Emory,
I have an 36% Extra where the servo's + receiver is powered by 1 pcs 1900 mAh and 1 pcs 3600mAh through individual 6,0 V regulators and connected to the servo's/receiver through a 3W power bus. The 3W powerbus will constantly through some kind of diode connection switch between the two packs supplying the servo's/receiver with power from the batterypack that has the at any time highest voltage.
The intention was to use two 2800 mAh packs but you where out of these at time of order, therefore the uneven sizes.
My problem is as follows;
As it seems like the power drain is (at least in the beginning) equal between the two packs, following 5 flights the 1900 mAh shows 7.15V and the 3600 mAh shows 7.5V under 1 A load. If the 1900mAh pack drops under the 6.0V regulator voltage the 3600mAh pack will take over all load.
My concern is that as the difference between the 6.0 V regulator voltage and the battery damage voltage of 5.5V is only 0.5V I can experience damage to the 1900 mAh pack before the 3600 mAh is taking over all load.
Will this be a real problem with uneven duralite plus packs with regulators and powerbus systems?? Or, will it balance as the smaller pack's voltage will drop more in transients (perhaps under 6.0V) as it weakens and therefore the bigger packs will supply these transients and in the end they will be completely discharged at the same time?
And, what do you mean by safe to fly at 7.1V/1A. Is 7.1V/1A in the "flat" region of the discharge curve? Is fex. 7.0/1A then at the end of the discharge curve? Is the discharge curve of the Duralite Plus available (can not find it at your web page)?
best regards
Kato
I have an 36% Extra where the servo's + receiver is powered by 1 pcs 1900 mAh and 1 pcs 3600mAh through individual 6,0 V regulators and connected to the servo's/receiver through a 3W power bus. The 3W powerbus will constantly through some kind of diode connection switch between the two packs supplying the servo's/receiver with power from the batterypack that has the at any time highest voltage.
The intention was to use two 2800 mAh packs but you where out of these at time of order, therefore the uneven sizes.
My problem is as follows;
As it seems like the power drain is (at least in the beginning) equal between the two packs, following 5 flights the 1900 mAh shows 7.15V and the 3600 mAh shows 7.5V under 1 A load. If the 1900mAh pack drops under the 6.0V regulator voltage the 3600mAh pack will take over all load.
My concern is that as the difference between the 6.0 V regulator voltage and the battery damage voltage of 5.5V is only 0.5V I can experience damage to the 1900 mAh pack before the 3600 mAh is taking over all load.
Will this be a real problem with uneven duralite plus packs with regulators and powerbus systems?? Or, will it balance as the smaller pack's voltage will drop more in transients (perhaps under 6.0V) as it weakens and therefore the bigger packs will supply these transients and in the end they will be completely discharged at the same time?
And, what do you mean by safe to fly at 7.1V/1A. Is 7.1V/1A in the "flat" region of the discharge curve? Is fex. 7.0/1A then at the end of the discharge curve? Is the discharge curve of the Duralite Plus available (can not find it at your web page)?
best regards
Kato
07-03-2003 | 03:32 PM
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From: Daytona Beach , FL
Loadsharing
Kato,
First we will trade your 1900mah and 3600mah packs for two-2800mah packs that you originally wanted; that will alleviate the situation.
The Stop Fly voltage is in the “Flat” region of the discharge curve. If you use our Stop Fly voltage you will have sufficient power available before the curve starts.
Please give me a call to discuss options in more detail.
This month we will introduce our new POWER BOX 40/24 designed to use with Lithium-ion and Lithium-Polymer batteries. This new POWER BOX has been designed and manufactured by the Team at MODELLBAU – DEUTSCH. The regulators will be included in the system.
Thanks,
Emory
386-255-0202
First we will trade your 1900mah and 3600mah packs for two-2800mah packs that you originally wanted; that will alleviate the situation.
The Stop Fly voltage is in the “Flat” region of the discharge curve. If you use our Stop Fly voltage you will have sufficient power available before the curve starts.
Please give me a call to discuss options in more detail.
This month we will introduce our new POWER BOX 40/24 designed to use with Lithium-ion and Lithium-Polymer batteries. This new POWER BOX has been designed and manufactured by the Team at MODELLBAU – DEUTSCH. The regulators will be included in the system.
Thanks,
Emory
386-255-0202
