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Easy to recharge
Is allowed by current regulations to be an aux. battery (Li-ion not allowed)
Allows for 45 mins of debugging time at full LV load (80W). 80W is our target LV load, not yet measured.
5000mAh X 12V = 60Wh
60Wh / 80W = 0.75h = 45mins
Allows for ~ 208 mins of operating time for the horn (5mins) and the fans
5000mAh X 12V = 60Wh
60Wh - 10Wh (fan) = 50Wh
50Wh / 14.4W = 3.472h = 208.3mins
Aux Battery Capacity
Required loads:
4 fans, 8 hours driving = 0.3A * 12V * 4 fans * 8 hours = 115.2Wh
Horn, 5 minutes = 4.5A * 12V * 0.0833 hours = 4.5Wh
Total Energy stored in battery: 115.2Wh + 4.5Wh = roughly 120Wh
We should give some headroom here, so aim for at least 150Wh of energy storage, or limit the fans to a lower current draw. We should check how much room we have for the fans, and also check with Adrian to see if we should be using smaller ones.
This means we will need at least a 10S2P of the NiMH C size cells, but 3P would be preferable.
Product Specifications:
Voltage | 1.2 each |
Capacity | 5Ah |
Maximum Discharge Rates | 10C constant - 50A 15C burst - 75A |
Chemistry | Ni-MH Rechargeable |
Weight | 70g each |
Dimensions | 44mm X 23mm X 23mm |
Total Price for Pack (inc. shipping) | $96.88 CAD |
Other sources for cells: Amazon