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Old 11-26-2019, 09:55 AM   #71 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
Why not run the blower power straight off the battery?
I'm not seeing how this changes anything? All the accessories run off the battery.


Quote:
There's also 7 cell lead acid race batteries.
That 7th cell keeps voltage under load close to what you get with a running alternator. But it needs a specific charger.
Last time I looked into that, I recall the prices being way higher than what this project will cost.

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Old 11-26-2019, 10:00 AM   #72 (permalink)
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Some blower electronics were terribly inefficient. A direct connection may help.
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Old 11-26-2019, 10:01 AM   #73 (permalink)
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Originally Posted by teoman View Post
Put a cardboard box over your printer. That will provide thermal stability to stop warping of the parts.

If you have delamination you may need to up the extrusion temperature.
Thanks for the tips. I actually just finished printing the bottom plate this morning. I lowered the extrusion temperature as much as I was comfortable with, raised the bed temperature a good amount, and used a 10mm brim on it. It looks like it came out pretty good.




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Time to get LED headlights!
I have certainly thought about it. The LEDs I have used in the past have worked okayish. Decent light output, low power use, good low beam, but horrible high beam pattern.
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Old 11-26-2019, 10:03 AM   #74 (permalink)
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I am still a little sad that we did not go the connector route with this project.


And use an arduino to monitor the packs.
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Old 11-26-2019, 01:12 PM   #75 (permalink)
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I still have to read up on how the BMS works. If it's not too hard there may be a V2.0. I still have a bunch of cells left over...
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Old 11-27-2019, 08:41 PM   #76 (permalink)
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I got the top and bottom plate printed up. Assembly is definitely not super easy, but it did go together.

The next step is to cut the bus bars and assemble it with the threaded rod.



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Old 11-27-2019, 11:05 PM   #77 (permalink)
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Adding + and - sings on the print and Voltage info on the print would have been a nice touch.

I suppose you could write it with a permanent marker.
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Old 11-30-2019, 04:55 PM   #78 (permalink)
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I got the latest and I think last trinket for this project, a low voltage disconnect. This circuit monitors the battery pack's voltage and once it hits a programmable set point it disconnects the pack from the load automatically. This will ensure the pack never gets too far discharged and prolongs its life.

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Old 12-01-2019, 01:24 AM   #79 (permalink)
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Be aware that the 20A rating on those may be optimistic.
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Old 12-01-2019, 01:53 AM   #80 (permalink)
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Quote:
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Be aware that the 20A rating on those may be optimistic.
He can always use it to operate a relay/solenoid that can handle more.

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