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  1. L

    Parallel packs feedback.

    Thanks, that makes sense, yes I can put a single fuse between the disconnect switch and the 2 parallel positive leads.
  2. L

    Parallel packs feedback.

    This is a schematic as to how I understand a parallel packs single BMS setup could work, but the big question mark for me is how do the balancing leads work, effectively the BMS would need to be able to handle 40S? Alternatively the BMS just balances the 2 packs as 2 x 72v cells which means...
  3. L

    Parallel packs feedback.

    Thanks everyone really helpful. I realise I was a bit light with my detail, I should have said, both packs will be "identical" as in newly built with new cells etc. J Bjork, yes that is my ideal scenario as the BMS would balance all the P groups and charge through a single common port, my...
  4. L

    Parallel packs feedback.

    Hello all, I have been plodding away with a conversion project for an old Lambretta for a while. As was expected the challenge has been packaging everything within the space available. I have a battery layout i would like to put up here for any thoughts and feedback. The preferred specification...
  5. L

    Lambretta conversion

    Sorry I didn’t realise you had posted! I really need to proof read my posts, I meant resistor not relay doh and that’s poor grammar on my part about the cable, what I meant to say was the BMS is a common port and has pairs of cables for B- and P- so I was going to use both P- cables to carry...
  6. L

    Lambretta conversion

    That integrated pre charge/ disconnect is a nice solution. I think as you say I should try to build in as much headroom as I can sensibly into the system wherever there is a component choice that will allow that. I am incorporating a switch, just to provide the option for swapping batteries, or...
  7. L

    Lambretta conversion

    Well, I don’t think I have ever received such a comprehensive explanation in reply to a question. Thank you for taking the time to set all this out. I have to be very honest and admit that it will take a bit of repeat reading for me to fully appreciate the detail of your answer, but the salient...
  8. L

    Lambretta conversion

    I have an ASI controller that I want to protect from in rush when connecting the battery. To do this the manufacturer recommends using a 250 ohm 30watt resistor wired in parallel with a circuit breaker. So with the circuit breaker open the battery can be connected, the resistor prevents a sudden...
  9. L

    Lambretta conversion

    Two very different but both awesome bikes! I bet your crew enjoys that. Thanks for your thoughts, i think it is all a compromise between space, weight, cost, power, range etc, I just need to work out what I want to prioritise. I have a more refined layout designed around the NESE housings, I...
  10. L

    Lambretta conversion

    Yes I just did a basic calculation using the Samsung 40t cells, just using equivalent overall cost as the denominator a 16p 20s pack built around 40t would offer 64Ah and 560A and not much extra cost, although an extra 5kg of weight. Alternatively if I want to stay at 15kg, 12p 20s is still a...
  11. L

    Lambretta conversion

    I think I see what you’re saying here, if I look at it with perhaps less focus on max voltage and a more balanced equation, why not look at 21700 cells with a higher energy density which would allow for higher peak draws from the battery and also provide the same wattage of power output at lower...
  12. L

    Lambretta conversion

    This is my initial attempt at a pack design, I would be interested in any thoughts regarding the general layout and very definitely the correctness of the theory. The green and brown colours are simply to show that each pair of NESE modules is a 16P cell. The middle row of modules is raised up...
  13. L

    Lambretta conversion

    Thanks for your thoughts. I think I should point out that I am learning to walk while at the same time resisting the urge to enter the 100m sprint final, it's just enthusiasm on my part! That is why I am so keen to get as much input and feedback as I can as I iterate the design. I have been...
  14. L

    Lambretta conversion

    Just a quick investigation of 3 possible battery configurations using NESE modules by Agniusm. Looking at 3.6v Li - Ion cells in different combinations of the NESE parallel modules to give a range of Ah and Amps. These parallel modules would be connected in 20 series to give 72V I have also...
  15. L

    Lambretta conversion

    Hi I have spent a little while finalising the packaging of the components. I found some original frame drawings for the Lambretta and in combination with my own measurements have been able to rough out the envelope that I have to work in. Short of 3d scanning the body work (why didn't I get the...
  16. L

    Lambretta conversion

    As a direction of travel, bearing in mind that at this stage I haven't even dropped the motor out of the scooter:) I am going to go with the Sur ron / Sur ron based solutions as this gives me an ecosystem for headlights, 'throttle' control, brake lights etc as well as several options for motors...
  17. L

    Lambretta conversion

    Unfortunately not, as the mounts that attach the case to the frame are cast in at this location so removing so much of the casting here would leave little or no attachment. I did look at using an outrunner there due to the narrowness of them but I'm not convinced at all that it would be suitable.
  18. L

    Lambretta conversion

    Thank you all for your replies. Although the hub option is the practical one, I really want to preserve as much as possible the aesthetic of the scooter and to me the lovely cast aluminium transmission / swingarm and rear hub are very much part of that. I agree that room is limited in a scooter...
  19. L

    Lambretta conversion

    I have got a bit further with working out the basic spec and mounting options for this conversion. Below are 6 very simple plan views, the first shows the existing engine, gearbox and surrounding body work and the dimensions of the available space, the 5 others show different options for...
  20. L

    Lambretta conversion

    Hello everyone, new member first time posting to introduce myself, serial tinkerer and restorer of old things, coffee machines, houses, computers and scooters. Literally zero technical knowledge of anything but a keen student of specialist forums to gain the answers and ideas to undertake the...
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