AEVA Forums

I wonder if using the supply we are measuring might affect the readings? If the reference voltage is changing will the measurements change or will the voltage regulator fix that? Another option Paul is 2 of these http://www.ebay.com/itm/282004999037 or for lifepo4 http://www.ebay.com/itm/14168869746...

Yes I was thinking of putting the nanos inside. Could the response of the first be added to the string of the second so only one comm channel? On another note, I've been researching arduino lifepo4 monitoring. There are many people discussing how it could be done, but none actually saying "this work...

Question: Since I have a bunch of 3.2v cells on the way, and my old PIP-812HS (12v 1kw) is in storage with 1kw of 12v panels.... I wonder what the max battery voltage could be. To use lifepo4 would require a firmware update anyway. It's pwm model so between 13v and 20v is wasted. So why not make it ...

Time to reassess Lifepo4 When I was writing the code for my soc monitor I had to enter several variables. The first was charging efficiency of lead acid, which many say is 80% while some others say 70%. Let's use 80%. The second is the peukurt effect which we will average to 90%. By contrast, Lithiu...

Was offered this clone from China. Shell is identical. Supposedly 60A mppt 4kva model. Let's play spot the difference.... http://forums.aeva.asn.au/uploads/4186/downloadWwFile.jsonwidth=872&height=611&size=827281&md5hash=97a1c6bf0296ffb6d2427df4b7fc2a08&ftsid=456908660820212265&suffix=.png&fromid=en...

Well this was interesting https://www.hackster.io/muhammadomer/power-up-a7dacb So for the past week I've spent quite a few hours relearning arduino coding and building a few sketches. Achieved : -Built soc calculator which takes into account things like puekurts law and the efficiency of lead acid. ...

I spent many hours looking into how I could control the SCR with arduino. Complex circuits, resistors & relays, opto-isolators....ugh.
Eventually I stumbled across this arduino controlled triac and at 4A per channel I can control a 16A element much more simply

Came across http://arduino.stackexchange.com/questi ... o-arduinos and since my distance is about 15m between arduinos I think it will be fine.

paulvk wrote: if you put the rs232 interfaces on them you can talk between the arduino's over hundreds of meters on cat6 cable

Does that mean I need more than 1?

I have the MPP remote, so rj45 cable already run.
I've ordered those extra bits. Cheers

I have a 16x2 display already but just ordered a 20x4 display with adapter.

I don't have a desktop computer so no serial port. Can I solder a male network plug on to the comms pins or is there some reason that won't work?

Correction - the other arduino boards are nano (5pc), not uno

I did state above but I think you missed it. It's a mega, though I also have some uno's. I also have a 16 relay board if required. Yes I think you are right - arduino is better suited for the job. The mega has 8 comms pins so assume I don't need a network shield? The SD card socket and sensor +3m ar...

This measuring voltage method maybe isn't best if using Arduino. Instead, I could use a shunt and measure the 0-75mv to see what current is going into the battery. Then make the Arduino decrease the resistance across the SCR (how?....are we just increasing current? Can Arduino control current?), whi...

I have written a lot of code for use in the AVRs (chip in Arduino) I write in Bascom its much more stable than the Arduino it has even passed space flight testing! Working on web server system to control my systems at the present so I am solving the interfacing problems now if your interested. Yes ...

Or simpler, just measure across one battery?

I have arduino mega. One issue stopping me from using thus far is the input voltage limited to about 18v. I need to measure 48-56v. Anyone know a solution or if pi can do it?

Here is a cheap 12v contactor . No extra set of contacts though

48v contactor with N.C contacts

reads in next days weather forecast < when running from batts at night, voltage level based on next days weather i.e. if you know its gonna be sunny and get a good charge, why not use more battery or less if its gonna rain etc This may be the thing I've been looking for. I've been running my SCR wa...

Assume it is a bigger case? Is it possible to mod a pip to add a second cc?

OK so a review of the coulumb meter http://s.aliexpress.com/Uvq6Bfaq So I had the pip remote next to the new meter. I was wasting a lot of time clicking to the screen I wanted on the pip. The new meter is more accurate than the pip. It is faster to respond and updates in real time and has better res...

So a while back I asked how I could have a bypass switch to quickly go to utility and back. I have a remote unit and just took it apart to see what the switch at the bottom is connected to http://forums.aeva.asn.au/uploads/4186/Studio_20160224_123400.jpg seems the switch is normally open with 2 wire...

For those considering the coulometer from a few pages back, I have one. Its been monitoring my lifepo4 for around 7 months now and appears to be very accurate. I asked for a 150a shunt and they were very obliging. Just received mine. Seems to work well. Except....I can't seem to access the menu. In...

What type LA do you have? I was thinking of adding lifepo4 to my agms but thought it would be impossible. Might be possible to balance using those voltage relays

Yes I understand the firmware mod, but why stop at 16? Why not 17-18-19 or more? Why was it necessary to change to 16 cells? (Other than out of the voltage ranges for the pip, which was fixed with firmware) Why did you choose those particular cells? other cells are better on ah per $ basis. I just c...

2 questions : 1. A lot of people using LifePo4, but what cells are you using? I see there is a new 42120 cell, 12.5aH. Seems to be best ah/$. I was looking at 38120 which were 10th. 2. Why stop at 15 cells? What are the voltage limits of the pip? The MPPT seems to be 60A limit so why not maximize th...

3. They are cycled once a year if they are lucky and spend 99.99% of the time not charging
4. There are fans constantly pushing air through