My friend has just got up and running with a Mac motor from Paul at emissions-free, using 12S LiPo.
He doesn't want to fork out for a Cycle Analyst, but obviously does need to monitor his voltage.
He's got balance lead devices already, but the batts are located behind his saddle so he needs something that can dispaly on his handlebars.
Is there a cheap voltmeter which is easy to rig up to this setup?
Cheers,
Kudos
Cheap Voltmeter?
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Cheap Voltmeter?
by kudos » Wed Jul 04, 2012 6:37 am
Build 1A Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 49V : 31mph
Build 1B Gary Fisher Wahoo Hardtail : Mac 10T 30A 49V : 27mph
Build 1C Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 82V :
Build 2 Mountain Cycle Fury FS : Mac 10T 30A 49V : in progress
Build 1B Gary Fisher Wahoo Hardtail : Mac 10T 30A 49V : 27mph
Build 1C Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 82V :
Build 2 Mountain Cycle Fury FS : Mac 10T 30A 49V : in progress
- kudos
- 100 W
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- Location: Guernsey, Channel Islands, UK
Re: Cheap Voltmeter?
by hjns » Wed Jul 04, 2012 6:46 am
Henk
High speed commuter w/ modified Lyen 18 FET 4110, 12AWG traces, extra Caps, beefed up shunt, modified Cromotor w/ thermistor, 10AWG phase wires. CAv3B22 with power-throttle limited to 8kW and 130oC motor winding temp, w/ GPS-enabled CA analogger. 20S 13.5Ah Lipo Zippy pack. Fusion FS frame, Fox RL rear shock, Fox F100 front fork, Schwalbe Fat Bob tires, HALO SAS 26inch rims with custom 12G(r) and 14G(f) black Sepim spokes from JRH and laced myself.
Commuter Cromotor build
High speed commuter w/ modified Lyen 18 FET 4110, 12AWG traces, extra Caps, beefed up shunt, modified Cromotor w/ thermistor, 10AWG phase wires. CAv3B22 with power-throttle limited to 8kW and 130oC motor winding temp, w/ GPS-enabled CA analogger. 20S 13.5Ah Lipo Zippy pack. Fusion FS frame, Fox RL rear shock, Fox F100 front fork, Schwalbe Fat Bob tires, HALO SAS 26inch rims with custom 12G(r) and 14G(f) black Sepim spokes from JRH and laced myself.
Commuter Cromotor build
-
hjns - 100 kW
- Posts: 1065
- Joined: Sat Aug 20, 2011 11:05 pm
- Location: Basel, Switzerland
Re: Cheap Voltmeter?
by kudos » Wed Jul 04, 2012 6:51 am
Hmm, thanks Henk but this display requires it's own separate power supply.
Not sure how that would work...
Kudos
Not sure how that would work...
Kudos
Build 1A Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 49V : 31mph
Build 1B Gary Fisher Wahoo Hardtail : Mac 10T 30A 49V : 27mph
Build 1C Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 82V :
Build 2 Mountain Cycle Fury FS : Mac 10T 30A 49V : in progress
Build 1B Gary Fisher Wahoo Hardtail : Mac 10T 30A 49V : 27mph
Build 1C Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 82V :
Build 2 Mountain Cycle Fury FS : Mac 10T 30A 49V : in progress
- kudos
- 100 W
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- Joined: Tue Aug 02, 2011 12:56 pm
- Location: Guernsey, Channel Islands, UK
Re: Cheap Voltmeter?
by hjns » Wed Jul 04, 2012 7:12 am
3 AA batteries in series? You wanted "cheap", remember... 
Henk
High speed commuter w/ modified Lyen 18 FET 4110, 12AWG traces, extra Caps, beefed up shunt, modified Cromotor w/ thermistor, 10AWG phase wires. CAv3B22 with power-throttle limited to 8kW and 130oC motor winding temp, w/ GPS-enabled CA analogger. 20S 13.5Ah Lipo Zippy pack. Fusion FS frame, Fox RL rear shock, Fox F100 front fork, Schwalbe Fat Bob tires, HALO SAS 26inch rims with custom 12G(r) and 14G(f) black Sepim spokes from JRH and laced myself.
Commuter Cromotor build
High speed commuter w/ modified Lyen 18 FET 4110, 12AWG traces, extra Caps, beefed up shunt, modified Cromotor w/ thermistor, 10AWG phase wires. CAv3B22 with power-throttle limited to 8kW and 130oC motor winding temp, w/ GPS-enabled CA analogger. 20S 13.5Ah Lipo Zippy pack. Fusion FS frame, Fox RL rear shock, Fox F100 front fork, Schwalbe Fat Bob tires, HALO SAS 26inch rims with custom 12G(r) and 14G(f) black Sepim spokes from JRH and laced myself.
Commuter Cromotor build
-
hjns - 100 kW
- Posts: 1065
- Joined: Sat Aug 20, 2011 11:05 pm
- Location: Basel, Switzerland
Re: Cheap Voltmeter?
by dogman » Wed Jul 04, 2012 7:20 am
That will work that way, but keep hunting. Thanks to a link from others, I just bought two voltmeters that run on just two wires, for 15 bucks for both. I'll look for a current sale on it from the same seller in a minuite here.
The other cheep option is the harbor freight or other multimeter. Often on sale for 5 bucks at HF, I actually just got one for free when I bought a pack of zip ties.
Can't get cheeper than that. Cut the leads, and splice into the controller input wires.
The other cheep option is the harbor freight or other multimeter. Often on sale for 5 bucks at HF, I actually just got one for free when I bought a pack of zip ties.
Can't get cheeper than that. Cut the leads, and splice into the controller input wires.
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.
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dogman - 100 GW
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- Location: Las Cruces New Mexico USA
Re: Cheap Voltmeter?
by dogman » Wed Jul 04, 2012 7:26 am
Link to one like the one I bought. No telling what seller I got mine from.
http://www.ebay.com/itm/Digital-Voltmet ... 3f195273d3
Link to my thread, when I got mine.
viewtopic.php?f=14&t=40616&p=593442&hilit=0+99v+voltmeter#p593442
http://www.ebay.com/itm/Digital-Voltmet ... 3f195273d3
Link to my thread, when I got mine.
viewtopic.php?f=14&t=40616&p=593442&hilit=0+99v+voltmeter#p593442
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.
-
dogman - 100 GW
- Posts: 22026
- Joined: Sat May 17, 2008 12:53 pm
- Location: Las Cruces New Mexico USA
Re: Cheap Voltmeter?
by kudos » Wed Jul 04, 2012 8:25 am
Thanks guys, I think one of these should work.
Kudos
Kudos
Build 1A Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 49V : 31mph
Build 1B Gary Fisher Wahoo Hardtail : Mac 10T 30A 49V : 27mph
Build 1C Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 82V :
Build 2 Mountain Cycle Fury FS : Mac 10T 30A 49V : in progress
Build 1B Gary Fisher Wahoo Hardtail : Mac 10T 30A 49V : 27mph
Build 1C Gary Fisher Wahoo Hardtail : Crystalyte HS3540 40A 82V :
Build 2 Mountain Cycle Fury FS : Mac 10T 30A 49V : in progress
- kudos
- 100 W
- Posts: 254
- Joined: Tue Aug 02, 2011 12:56 pm
- Location: Guernsey, Channel Islands, UK
Re: Cheap Voltmeter?
by d8veh » Wed Jul 04, 2012 8:58 am
I got the same ones as Dogman. Perfect for the job. No external power supply needed and supposedly waterproof. I haven't soaked mine yet, so I can't confirm the waterproof bit.
All my present bikes that I built can be seen here: http://www.pedelecs.co.uk/forum/members/d8veh.html
- d8veh
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Re: Cheap Voltmeter?
by dogman » Wed Jul 04, 2012 11:40 am
Got one wet last night, not real bad, but rained on some. Kept on working fine. The backside was kept dry with some tape I had wrapped around it.
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.
-
dogman - 100 GW
- Posts: 22026
- Joined: Sat May 17, 2008 12:53 pm
- Location: Las Cruces New Mexico USA
Re: Cheap Voltmeter?
by wesnewell » Wed Jul 04, 2012 12:47 pm
If he's using a 48V controller most have LVC set to 42V which is about a perfect cutoff for 12s lipo at 3,5V per cell. It will protect from over discharge, but if you want to see remaining voltage, this one works great. Hook up to controller side so it goes off with controller.
http://www.ebay.com/itm/Waterproof-Digi ... 0900779903
http://www.ebay.com/itm/Waterproof-Digi ... 0900779903
Mongoose 26" FS MTB bike $99, yescomusa.com 48V 1000W rear hub kit $276, Hua Tong 72V 40A controller $35, 10ah 24s lipo $275=40+mph, range=45 miles @20mph
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wesnewell - 100 MW
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Re: Cheap Voltmeter?
by ddk » Wed Jul 04, 2012 1:57 pm
dogman wrote:...The other cheep option is the harbor freight or other multimeter. Often on sale for 5 bucks at HF, I actually just got one for free when I bought a pack of zip ties.
Can't get cheeper than that. Cut the leads, and splice into the controller input wires.
been using one of my HF meters on the same set of batteries since 2007. The other since March this year.
They're "on" about two hours daily.
"Au contraire, mon frere"
"The more you pay for a bicycle part, the harder it is to install" Mr Contrary, formerly known as "wishey-washy-wobbly"
"The more you pay for a bicycle part, the harder it is to install" Mr Contrary, formerly known as "wishey-washy-wobbly"
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ddk - 100 kW
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Re: Cheap Voltmeter?
by hjns » Fri Jul 06, 2012 12:27 am
torqueon wrote:Celllogs from hobby king $15 each
Hmm. These will unbalance your cells with continuous use. Therefore, I prefer to use my Cellogs only momentarily to get a detailed snapshot of my cells.
Henk
High speed commuter w/ modified Lyen 18 FET 4110, 12AWG traces, extra Caps, beefed up shunt, modified Cromotor w/ thermistor, 10AWG phase wires. CAv3B22 with power-throttle limited to 8kW and 130oC motor winding temp, w/ GPS-enabled CA analogger. 20S 13.5Ah Lipo Zippy pack. Fusion FS frame, Fox RL rear shock, Fox F100 front fork, Schwalbe Fat Bob tires, HALO SAS 26inch rims with custom 12G(r) and 14G(f) black Sepim spokes from JRH and laced myself.
Commuter Cromotor build
High speed commuter w/ modified Lyen 18 FET 4110, 12AWG traces, extra Caps, beefed up shunt, modified Cromotor w/ thermistor, 10AWG phase wires. CAv3B22 with power-throttle limited to 8kW and 130oC motor winding temp, w/ GPS-enabled CA analogger. 20S 13.5Ah Lipo Zippy pack. Fusion FS frame, Fox RL rear shock, Fox F100 front fork, Schwalbe Fat Bob tires, HALO SAS 26inch rims with custom 12G(r) and 14G(f) black Sepim spokes from JRH and laced myself.
Commuter Cromotor build
-
hjns - 100 kW
- Posts: 1065
- Joined: Sat Aug 20, 2011 11:05 pm
- Location: Basel, Switzerland
Re: Cheap Voltmeter?
by HypnoToad » Fri Jul 06, 2012 8:29 pm
hjns wrote:http://www.ebay.com/itm/0-99-9V-DC-Digital-Display-Panel-Voltmeter-Three-Bit-Red-0-36-LED-Voltage-Meter-/160835859769?pt=LH_DefaultDomain_0&hash=item2572907539
Cheap enough?
I use one of there, just use a 9v pp3 battery to power it and you're good to go.
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HypnoToad - 100 W
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