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Thread: Team MedBots

  1. #341
    2 Bosch 400 @12V is 80A nominal and about 200A stall.

    A 3 or 4S LiPo 8000mAh 30C will do nicely.
    And for about £40 @ Hobbyking you can't go that wrong.

  2. #342
    Max's Avatar
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    Quote Originally Posted by maddox10 View Post
    2 Bosch 400 @12V is 80A nominal and about 200A stall.
    That's overall right, not 80A nominal per side?
    I also think if I go lipo I will get 2/3 lipos around 4000mah that way I can wire them in parallel so have 3 times the wires so hopefully they won't get too hot.

  3. #343
    Max's Avatar
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    Just tested it with a 12v car battery and it doesn't seem to do anything at all, the connector doesn't spark at all when connected unlike when the other SLA is used. I checked the battery and connector with a multi-meter and got a voltage so I'm stumped why it doesn't work. Anyone any ideas?

  4. #344
    If a SLA is "empty", it still can give V, but not A. Did you measure during and after linking up?

    And of course, wires and connectors can come lose

  5. #345
    Max's Avatar
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    Have finally managed to get the heavy driving! See video bellow:


    It still cuts out from time to time, I think this is still the battery voltage dropping too low, I have another SLA so will charge them both up and put them in parallel and hope they can provide enough current without the voltage dropping too much.

  6. #346

  7. #347
    Max's Avatar
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    They are bosch 400 motors running off 12v, they are a lot cheaper than the bosch 750s but not as powerful.
    They were custom gearboxes but where relatively simple to make but I did use a milling machine with a digital readout to drill the holes to ensure the hole spacing was correct. I think there is a video of just the gearboxes earlier in this thread.

  8. #348
    Max's Avatar
    Member

    Tried again with the pair of SLAs in parallel but it still kept cutting out
    Other than buying a set of lipos all I can think of is putting the batteries in series then setting the travel adjusts to 58% to give 14v so hopefully it won't drop so low the esc cuts out.
    Anyone got any other ideas?

  9. #349

  10. #350
    I've got some NIH bot packs for sale, 3 x 24v, 3000mAh packs if you're interested.

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