Not Enough Battery?
I've got a Wattage Cobalt 400 mated to the Wattage 2.25:1 planetary gearbox spinning an APC 10x5 E prop. I'm using a 10-cell 1100 mAh NiMH pack of Hecell batteries that is supposed to be able to supply up to 16 amps. With a freshly charged pack, I'm seeing on my Wattmeter 125W with a 12 amp draw and it displays a voltage of 9.4 volts. One club buddy said if the pack was putting out properly, I should be seeing at least 10 volts. He thinks the setup is taxing the pack. The pack is a bit over a year old, but has never been used. It has been cycled 5 or 6 times to bring it up to max, but it has been sitting for 3-4 months. Will a couple of new cycles bring it back to full potency? Or are the numbers listed above reasonable for this setup? Any thoughts? Carlton Campbell
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RE: Not Enough Battery?
Well, some of the NiMh`s tends to go to sleep after some weeks needing some cykles to work properly again. But I think your voltage readings is low. Measure the pack after charging, but load it by running the motor for some seconds and remove the load and do the measuring. I think you should read appr 13Volt then (OK, I`m not too experienced on NiMh...) If you measure ex 11Volt you sure have a dead cell in the package. And if you don`t load the batteries you could read as much as 15volt when fresh charged.
Maybe you have to try to measure each cell, and maybe the batteries are out of date. |
RE: Not Enough Battery?
125W divided by 12A = >10v. The readings don't tally. Also, 10-cells x 1.2v = 12v (Maybe you can get a bit more as a resting HOC voltage, but not 15v!) I can't see how you can expect readings of 15v even hot off the charger. If you are pulling ~12A from a pack of 1100mAh cells, you can expect voltage under load to drop considerably - to 9-10v.
Cheers, Phil |
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