Recent content by Ekart

Thanks methods, just a fun project ... and very handy as I used to paddle up river and then the wind would pick up and nearly kill me to paddle into the headwind back to the car... if you don’t mind me asking ..where did you get your yellow battery packs from? Are they lithium , what...

Thanks again Stan for your great info and knowledge on the subject, I really appreciate your help! I will look into those cell packs and do plenty of research before buying. I’m also interested in building my own “power wall battery pack” for my solar panels which will be about 10KW as the Tesla...

Hi Stan thanks for all that great information! Running an alternator at 20,000 rpm you would hear it coming down the street! The RC 24v /80Amp batteries sound good! Where can I get those please? I bought my 1500w 48v controller for the ekart from Aliexpress for AUD$39. Which I thought was...

Yes lithium will be the next step .. and I can also use on my eKart and ebike!! (Other sections in this endless-sphere forum). Lithium would be lighter to carry down to the waters edge also!

Wow thanks Stan, those charts really show the efficiency changes with those field current inputs. Yes the lead acid batteries were a cheap starting point. $50 for the four. But I’m looking at around $3-400 for lithium packs so thats the next step. Even making your own is not cheap .. 18650’s...

Hi guys just wanted to show you my first "E" project 2-3 years ago I made up a transom and attached to my Kayak then added a 34lb thrust WaterSnake (shortened the shaft) 5 speed outboard motor. I use two 12v 18Ah batteries in parallel and this gives me a range of about 10km on the river at up to...

Many thanks Stan...that's great info and saves me wasting my time. I had thought to use it to "kick start" the ekart from standstill but probably not worth the effort and extra weight/cost involved. I will check out "Tucker, the man and his dream".. I appreciate all the great info you guys are...

Hi markz Yes I saw Joker as well.. very “dark” movie, the first of a few I think! The pancake motor is rated at 36v dc and draws about 11.6Amps, so thats 417.6 watts which is just above 1/2 hp roughly, but I had it running on 24v only 2x12v in series, so maybe 1/3 hp realistically. It was ok...

Hey markz, here’s my first project you may like .... an ebike using a printed circuit motor (pancake motor) running off two 12v 18Ah batteries in series. The motor is from a mainframe computer reel to reel tape drive ( from about 1976) I had kept for a rainy day. I used a DC controller for speed...

Hi Stan, thanks for your thoughts and ideas, yes varying the field current on the alternator rotor would be good and I have worked with Arduino quite a bit with multiple sensor types. An inductive sensor could work well to monitor Alternator rpm and adjust current through windings accordingly. I...

Hi markz, yes 12 volt on the rotor windings via a separate battery now. The shaft on the pulley was 5/8" threaded at the outer end to take the Fan and split pulley with lock washer and nut. These were replaced first with pulley and "V" belt and eventually replaced with sprockets and a large...

:bigthumb: hi guys, just an update albeit a few weeks later! The Ekart is working!! I rewired the alternator for “Star” connected and away it went ! Draws about 14Amps at 46v whilst running at about 25 mph.

Yes a rolling start has been tried and same problem..just stops, but will recheck, we've done some changes since then. My son thought of reversing the polarity on the rotor winding battery but have not yet heard of the result.....cheers!

Hi markz, I watched the original idea video again here: https://youtu.be/IKqy3rRWJQE and his battery pack that apparently works is made up of 4 of 12v 12Ah gell cells and ours is 4 of 12v 18Ah gell cells so I’m thinking it should be ok?? Battery sag on full load goes down to 46v and LVC is 42v...

Thanks eee291, I think you have it! I do not know enough about those batteries and how much instantaneous current they can/could provide. We will try better batteries .. I guess you guys use lithium iron cells in a pack? Lighter and able to provide 45amps?? Cheers