19 amps at 12 volts for 312 CFM seems pretty high. I've got a Procomp radiator fan rated at 500 CFM that pulls about 5 amps at 12v. Maybe because it's pushing through restricted passages?
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19 amps at 12 volts for 312 CFM seems pretty high. I've got a Procomp radiator fan rated at 500 CFM that pulls about 5 amps at 12v. Maybe because it's pushing through restricted passages?
I think your comparing a Centrifugal fan to a Propeller Fan. propeller fans are more efficient at low pressure.Originally Posted by JRP3
Last edited by frequencydip; 05-18-2012 at 05:17 PM.
Picked my car up today. Didn't overheat, but it wasn't that warm out and didn't take my usual route. Temp was on the last blue bar, though.
One thing they did was to remove the "sump cover" This is a plate the covers the area that had leaves in the photo I posted earlier (here). They want me to monitor the temps and report back to them. I was thinking that area was where the hose from the blower attached to the PEM, but apparently not. Wish I could have been there when they removed the PEM.
> Wish I could have been there when they removed the PEM.
?? So who took that photo of the leaves blocking the vent??
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This is the heat exchanger for the charger. if blocked, you cannot charge at higher rates. mine got stepped down to 27A/44A instead of 60A. Also the fan worked at highest level without getting a proper result.
#421 S32
I had a Roadster stop at my house for some juice yesterday. I've got 70A but his VDS kept dropping to 53A/53A while his PEM felt very warm. It was a bit of a mystery to us but now I think he's got leaves blocking his airflow. I should have looked at his PEM temp on the VDS but didn't think of it. He's got a 2.5 with the new fan.
Mine is also blocked I think (as does the ranger). They should be coming out to clean it and upgrade the fan next week. However, we did a 1100km round trip this weekend to Coimbra (Portugal) from home (Madrid) and the biggest issue we had was when charging yesterday at 32A... It was a hot day (officially 39C) and in the midday charging place OVMS showed the external temp to be 53C!! This made keeping PEM and Battery cool very difficult and the charge current got restricted down to 10A.
As this was going to turn a 6 hour recharge into an 18 hour recharge we came up with a solution (Don't try this at home folks... water and electricity do not mix... but it did work for us)... PEM ice cooling.
We put *sealed*bags of ice on top of the PEM and waited to see what happened (we also put some snacks on top of the ice to cool them too):
While I wouldn't want to put bags of ice on the PEM regularly, on this occasion it worked and we charged at 32A after about 30 mins with the ice packs.
Of course the Model S has this problem covered. Maybe one day one of us will come up with a liquid cooling upgrade for PEM and motor...
Roadster VIN#454EU
ModelS Signature #92
Renault Zoe #87
I think that upgrade might be coming from TM itself.
If it is worth doing, it is worth OVER doing. - Mythbusters
Debunking Pseudoscience is fun!
Arctic White Roadster 2.5 #1200, S Sig Performance Vin# 227
How big of a gesture would that be to replace all the PEMs on the Roadster for free with a liquid cooled one. Won't happen since its expensive.
I suppose there's a chance doing this could cause condensation inside the enclosure.
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