Search found 37 matches

by neilg
Mon, 15 Jan 2018, 12:47
Forum: Other
Topic: Pipistrel electric aeroplane - in Perth!
Replies: 6
Views: 202

Re: Pipistrel electric aeroplane - in Perth!

A report by my son on the first flight. The following is some extracts of his report (photos and the report to be attached later). This report makes interesting reading as it shows the differences between Electric vs ICE propulsion such as running and maintenance costs, pre flight preparation and ge...
by neilg
Mon, 08 Jan 2018, 21:52
Forum: Other
Topic: Pipistrel electric aeroplane - in Perth!
Replies: 6
Views: 202

Re: Pipistrel electric aeroplane - in Perth!

My son has booked to FLY the plane early next Saturday so I hope to be able to give you a second hand account of the plane, it's handling and his general impression of it.
by neilg
Thu, 17 Nov 2016, 06:15
Forum: Mitsubishi
Topic: Noises on!
Replies: 14
Views: 699

Noises on!

While I was in Florence recently I noticed quite a few electric vehicles (mainly taxis) roaming the streets and often they would manually turn on a slow beeper or some other sound when pedestrians were in front of them. Florence near the El Domo is full of narrow one way streets and a very popular t...
by neilg
Wed, 29 Jun 2016, 06:14
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

100 Wow so I thought I had better check for memory usage on the Uno for V3. Can do 120 cycles (uses 74% dynamic memory) but after that you will start to get "Low memory available, stability problems may occur." warnings up to around 180 cycles when you will run out of memory. The extra memory usage ...
by neilg
Tue, 28 Jun 2016, 22:52
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Hello Mr jonescg I have updated the CellTester to v3.0 to implement current sensing. It will now take input from a Jaycar XC-4610 and log this along with the voltage. I have added time info to the log to show how long the charge or discharge has been running. It will now calculate the Ah capacity fo...
by neilg
Sun, 26 Jun 2016, 06:38
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

I think I have the solution for your current monitoring. Jaycar have a 30A Current Sensor Module (XC-4610) which is Arduino compatible and it is isolated and bi directional so that you can measure both charge and discharge currents. Costs $9.95 and outputs 66mV/A and is powered from 5v. I looked at ...
by neilg
Thu, 23 Jun 2016, 06:32
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Re the 2 relays operating together. Had a look at the tech spec for the Uno and all I can suggest is to try using Digital I/O 3,5,6 or 9 as 10 to 13 are used for SPI (Serial Peripheral Interface) and MAY be affecting the relays. Also 13 has a LED on it but again this shouldn't affect anything. Don't...
by neilg
Wed, 22 Jun 2016, 06:17
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

I have rearranged the code so it finishes with a charge cycle. You will need to modify the code as shown in blue below       case STATE_CHARGING:         cellVolts = readVoltage();      // Do a read         Serial.print("Charge Voltage = ");        // Logging         Serial.println(cellVolts);      ...
by neilg
Mon, 20 Jun 2016, 05:50
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

In the readVoltage() function simply change the last line to: "return temp/4;" You would then need to adjust the pot so the wiper is at 4.2v (assuming that is what V_MAX is set to) when the battery is at it's max value. You shouldn't need to change V_MIN. Looks like 20 cycles isn't going to take too...
by neilg
Sun, 19 Jun 2016, 23:32
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Congratulations, now you can hours of fun.

I can't see any reason why both relays are on together.
I'll have to have a think about that one.

neilg
by neilg
Sun, 19 Jun 2016, 21:22
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Re the voltages - my bad, I had set single cell voltages as you said but forgot about the 2:1 divider, so yes 8400 should work.

Just had a look at my scaling logic and I got it wrong but by changing the voltages it should work.

Glad you are getting there.
neilg
by neilg
Sun, 19 Jun 2016, 20:15
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

If you moved A0 and A1 to A2 and A3 did you also change these in the code?
Did you implement the logging to see the voltage and does this change when altering the pot?

neilg
by neilg
Sun, 19 Jun 2016, 18:44
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Hi again jonescg Have been thinking about the relay problem. When the cpu is reset all digital pins are set as inputs and I suspect that weak pullups are turned on. This is enough for the transistor driver on the relay board to turn on and operate the relay. Easy fix - just put a resistor of about 4...
by neilg
Sun, 19 Jun 2016, 06:55
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Hi jonescg. You really need to put a resistor in series with the top of the pot to prevent the analogue input exceeding 5v if ever you crank the pot up full. I think that when you tested this without the Uno powered up, the internal protection diode on the analogue input (inside the cpu) made the 5v...
by neilg
Wed, 15 Jun 2016, 05:52
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

I realise using a gain stage is the best solution for measuring current but I was only going on the original circuit in the first post which shows the shunt input going directly to an analogue input and the limitations of this needed to be pointed out. Also my suggestion for using Ohms Law was for t...
by neilg
Tue, 14 Jun 2016, 06:23
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

If you know the load resistance and the voltage then you can work out the discharge current. Using the analogue input with a 50mV shunt will only give you a count of 0 - 10 for whatever the rating of the shunt is. i.e a 50mV 10A shunt will give a resolution of about 1A. 50mV @ 20A = 2A. I think usin...
by neilg
Mon, 13 Jun 2016, 23:52
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Jonescg: Here is the CellTester Arduino project for you to play with. I have had a bit of fun writing and testing this. Anyone is free to use and modify it as they like. There is a description at the top of the file and it is fairly well commented so should be self explanatory. I developed this on a...
by neilg
Mon, 13 Jun 2016, 05:55
Forum: Batteries, charging, management and monitoring
Topic: Arduino cell cycle tester project
Replies: 59
Views: 3380

Arduino cell cycle tester project

Jonescg said "Oh, and the big problem - programming" As no one has piped up to offer you some assistance, I would like to offer some help in the programming department. I've been playing with Arduinos for a year or so now and been programming for about 40 years. I have knocked together a quick sketc...
by neilg
Fri, 06 May 2016, 06:57
Forum: The Lounge
Topic: PIP-4048MS inverter
Replies: 1940
Views: 188157

PIP-4048MS inverter

Northland wrote: One issue stopping me from using thus far is the input voltage limited to about 18v. The 18 volts is the maximum power supply voltage on the power connector. ALL input and output pins on the Arduino Mega are a maximum of 5 volts. The CPU internal analogue reference voltage is a max ...
by neilg
Sat, 23 Jan 2016, 06:41
Forum: Nissan Leaf
Topic: Chademo
Replies: 18
Views: 2365

Chademo

Quote: "You might be able to buy variacs still. Nothing on Ebay" If you (or anyone else) is interested I have a open frame 3 phase variac made by Warburton Franki which came out of a large welder many years ago. I can't find any specs on it on line or from WF. All windings are intact but the slip ri...
by neilg
Mon, 04 Jan 2016, 05:47
Forum: Batteries, charging, management and monitoring
Topic: Dual output DC/DC query...
Replies: 9
Views: 395

Dual output DC/DC query...

Jonescg I think you have the connections to the 13k resistor from the voltmeter reversed. The negative of the voltmeter should be to the negative of the battery and the positive goes to the junction of the 13k and 1.3Meg resistor. You then have the -ve of both meters going to the same point (-ve of ...
by neilg
Sun, 06 Dec 2015, 05:19
Forum: Mitsubishi
Topic: Home Wall Chargers?
Replies: 59
Views: 2370

Home Wall Chargers?

Originally posted by zzcoopej zzcoopej wrote: I did look at undoing but I'd have to buy a tool. Its a star shape screw but only 3 ie one less than philips head(4). You can get driver bit sets (32/33 pieces) from Altronics or Jaycar for around $11 or $15 which have the tristar plus Philips, slot, tor...
by neilg
Wed, 19 Aug 2015, 05:29
Forum: Batteries, charging, management and monitoring
Topic: Two Chargers Simultaneous Charging
Replies: 55
Views: 3190

Two Chargers Simultaneous Charging

Sorry for confusing you. "The existing charger is a “InPower” 96volt 12 amp charger,....." I don't know the charger but you quoted the above so I assumed it was set for 96 volts. Seeing it can charge to 124.3v then it will charge at the full 12A and the current will gradually reduce as it nears 124....
by neilg
Tue, 18 Aug 2015, 06:21
Forum: Batteries, charging, management and monitoring
Topic: Two Chargers Simultaneous Charging
Replies: 55
Views: 3190

Two Chargers Simultaneous Charging

I don't think you will get the charge current (30A) you expect. Once the battery voltage exceeds the InPower voltage (96v) it will think the battery is "full" and stop producing current, leaving the TC charger to put 18A into the battery. So you will get 30A to 96v then 18A to 122.4v Even adjusting ...
by neilg
Wed, 01 Jul 2015, 05:44
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 58
Views: 10486

Weber & Coulomb's LyteFyba BMS

The reverse current of the LED maybe similar to the leakage of the LM334 and keep the LED to <6v but I would err on the side of safety and put a reverse protection diode in. You wouldn't want it failing!

Neilg