redline2097 Posted April 25, 2015 Report Share Posted April 25, 2015 (edited) Where I see or check the limit of the hvc? Can it hold 7s lipo? And If I buy Kelly Controller, 10s lipo pack is this charger enough: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6792 or need I this: http://www.hobbyking.com/hobbyking/store/__6609__iCharger_1010Bplus_300W_10s_Balance_Charger.html? Which is the cheapest good charger for 2x 10s packs? Or is it wiser to get 4x 5s lipos and 4x charger? and what voltage controller from hobbyking you could recommend? Edited April 25, 2015 by redline2097 Quote Link to comment Share on other sites More sharing options...
gwhy Posted April 25, 2015 Report Share Posted April 25, 2015 No I dont think it will be a option to remove the hvc as there will have to be a fair few other modifications that would have to be done to the controller .. ( the hvc will be there for a reason ) .. you could look for a after market 36v or 48v controller something like this http://kellycontroller.com/kds72100e100a24v-72v-mini-brushed-controller-p-761.html or even sometihng like this may be ok to try if you want it in a hurry and cheap :-) http://www.ebay.co.uk/itm/36V-800W-Speed-Controller-Box-Electric-Bike-Scooter-Brushed-/251638297450?pt=LH_DefaultDomain_3&hash=item3a96cfb36a .. I have no idea on how this controller will perform but for the price it may be worth a punt. 8s of lifepo4 will be equivalent to 24v sla as regards the voltage , but will give you much better performance and it will work on your 24v controller .. there will be very little voltage say ( unlike sla ) so you will have a higher top end anyway and this will also mean that you will have more power. the 10s charger will be ok for any voltage upto 42v for lipo or 24v lifepo4.. you will need to have a variable voltage psu to test the hvc of the controllers .. I think if I were in your position I would opt for the 8s lifepo4 and the 10s charger this will work with the exsiting controller and may be enough of a performance boost but if you are still want higher performance then you can upgrade the controller and just buy another 4s lifepo4 to make the voltage upto 36v and a additional 6s 50w controller. Quote Link to comment Share on other sites More sharing options...
redline2097 Posted April 27, 2015 Report Share Posted April 27, 2015 (edited) Lifepos are too expensive for my budget. What about purchasing 6s lipos now and later adding 3s lipos to them? So now it would be 25.2v hot off the charger. I would like to have 20000 mah so I have to buy 4 x 5000 mah 6s lipos and add them parallel. Is it okay to purchase parallel charge board and charge all lipos at once with this charger: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=58216and how long charging would last? Later i would purchase another cheaper charger to 3s lipos and charge them separately. I would use my 500w ATX power supply, which gives 34 A to 12v line. Can I run 3s and 6s charger simultaneously with it? Thanks for the advices. Edited April 27, 2015 by redline2097 Quote Link to comment Share on other sites More sharing options...
gwhy Posted April 27, 2015 Report Share Posted April 27, 2015 yes lifepo is a little more expensive but... may work out cheaper in the long run.. for a 8s2p (24v nominal) and 28.8 hot 8.5ah lifepo will work out around £120 and for a 6s (22.2v nominal) and 25.2 hot 10ah lipo will work out around £95 http://www.hobbyking.co.uk/hobbyking/store/__14074__ZIPPY_Flightmax_8400mAh_4S2P_30C_LiFePo4_Pack.html http://www.hobbyking.co.uk/hobbyking/store/__9518__Turnigy_5000mAh_6S_30C_Lipo_Pack.html the chargers are the same to charge either type of battery so that will be a fixed cost yes as long as the batterys are all the same capacity and voltage then you can use a parallel board. if you P'ed 2x6s 5000mah packs then with that charger it will take approx a 1 hour charge (the charger will charge a 6s pack with a max of 10A ) so if it was a 20ah pack it will take approx 2 hours. but I would recommend only charging at a 5A rate max. ( charge times will take longer if balance charging ) yes your ATX psu should be fine powering that charger at its full capacity .. but remember that atx psu are not rated for continuous max output .. so again another reason to only charge at a max of 5A Quote Link to comment Share on other sites More sharing options...
redline2097 Posted April 27, 2015 Report Share Posted April 27, 2015 Using 4x turnigy 5000mah 6s 20c pack I get 25.6v 20ah for just £114 so pretty cheap instead of Lifepos. So charging four of them simultaneously it would take 4 hours. Quote Link to comment Share on other sites More sharing options...
redline2097 Posted April 27, 2015 Report Share Posted April 27, 2015 Change to the plans, I just got 6v battery measured 6,45v and I added it to series with fully charged original batteries and backwheel SPINNED! So I guess I will try to find exact HVC with adjustable dv power supply. It would be amazing if 8s lipo would be ok so I don't need to buy Kelly Controller to bike. So it was now around 32v and 8s lipo is hot off the charger 33,6. I try it tomorrow with power supply. Quote Link to comment Share on other sites More sharing options...
redline2097 Posted April 30, 2015 Report Share Posted April 30, 2015 (edited) Just one quick question. My friend has pretty new 36v 20ah Lifepo kit with bms willing to sell to me ~£300. It would be awesome, but can the 500w motor handle hot off the charger voltage (43,8v)? It's XIANGYANG XYD-131 http://www.china-xiangyang.com/en/Img.asp?/b-31-pp-0-c-133.html There it says 24-48v. Or can I limit the current via Kelly Controller. That battery would just be so good, because when we are buying oset 16" 36v, it would fit it too. Edited April 30, 2015 by redline2097 Quote Link to comment Share on other sites More sharing options...
gwhy Posted April 30, 2015 Report Share Posted April 30, 2015 (edited) the motor should be fine as long as the controller can handle the voltage.. you may want to gear down the bike a little and turn down the current on the controller to tune the the bike for your needs and to keep the motor in the sweet spot. before buying this battery ask what is the max current the bms can supply as it need to be at least 40A constant for the smaller osets. Edited April 30, 2015 by gwhy Quote Link to comment Share on other sites More sharing options...
gilles Posted April 30, 2015 Report Share Posted April 30, 2015 Hey guys, Maybe share some pics on how you'll fitted them RC batteries on the OSET? So we can exchange ideas. also found this post : http://www.trialscentral.com/forums/topic/55299-oset-charger-battery-upgrade/?hl=oset Boost bike?? Greetings Gilles Quote Link to comment Share on other sites More sharing options...
redline2097 Posted May 1, 2015 Report Share Posted May 1, 2015 (edited) Sadly the 20ah lifepo pack didn't fit to my son's Oset. So I am ordering 8s lipo pack from hobbyking. Is there on hobbyking a voltage meter that can measure whole pack voltage and I just charge it when it hits 8 x 3.2v = 25.6v.I think I don't need invidual cell voltages because I am planning to balance check/charge every week or two. Or is invidual cell meter better and which one I should get? Is this ok: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=42751I would put it on side of my pack so it would be easy to check on to go. If I use now 4x 4s 5000 mah batteries to get 8s 10ah, is it okay to later add 2 x 2s 5000 mah batteries to series totaling 10s 10ah? Can different voltage batteries be added to series when amps match. Edited May 1, 2015 by redline2097 Quote Link to comment Share on other sites More sharing options...
gwhy Posted May 1, 2015 Report Share Posted May 1, 2015 I use a small volt meter to meter the total voltage of the pack that is wired into the main bike wiring on my bikes, and as long as you disciplined enough to stop riding at the conservative lvc then there should be no problem... I always balance charge my battery's every charge as this prevents the battery's being over charged if you have a couple of rough cells in your total pack. also the charger will prevent the battery being charged if any of the cells are below the safe level. a conservative lvc would be 3.4v per cell as the cells don't always discharge at the same rates. Yes you can add battery's in series as long as they are the same capacity. The volt meter you linked to only reads upto 30V and 30A which is not enough.. I use these http://www.ebay.co.uk/itm/led-Voltmeter-Battery-Panel-Meter-Car-Motor-Waterproof-15-120V-dc-/251611817412?pt=LH_DefaultDomain_3&hash=item3a953ba5c4 for my bikes they are small, cheap and water proof.. Quote Link to comment Share on other sites More sharing options...
redline2097 Posted May 2, 2015 Report Share Posted May 2, 2015 Where you wire that so it's off when bike is? Quote Link to comment Share on other sites More sharing options...
gwhy Posted May 2, 2015 Report Share Posted May 2, 2015 I always unplug the batterys from the bike when not in use so the voltmeter is permanently wired into the bikes wiring and comes on when the battery is plugged in.. I also never charge my battery's while they are still on my bikes .. as it much easier to put the batterys in a fire safe place when charging rather than having to put the complete bike in a fire safe place. Quote Link to comment Share on other sites More sharing options...
redline2097 Posted May 3, 2015 Report Share Posted May 3, 2015 Just for the info, oset 12.5" original motor controller cuts off exactly 32.1V, so 7s Lipo is maximum for that. Quote Link to comment Share on other sites More sharing options...
redline2097 Posted May 3, 2015 Report Share Posted May 3, 2015 Finally made decision and ordered: -6x 5000 mah 4s turnigys, so total pack is 42v/15ah -Icharger 106b and parallel board so I can charge all packs once -Using atx power @12v -Kelly KDS48100E with cables and waterproof -0.4" led Voltmeter -Lots of wires and connectors and Lipo safe pack Now waiting for delivery. Totaling ~£370 Quote Link to comment Share on other sites More sharing options...
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