Make output limit dependent

[Cniemand]

Haha. How cool. 

Ahh the things that could be done with 8 kW of panels... Panel Envy. (2 kW)

[ClassicCrazy]

A nice feature for charging lithiums would be for the Classic to be able to disable charging if the battery temperature is below freezing ( or close to that ) .  I just got some lithiums for a new system. My lead acids I just leave out in the shed and let the Classic temp compensate them. But with lithium I understand it isn't good to charge them below freezing.

Larry

[Cniemand]

You are right, Larry! A temp compensation to switch off the input entirely on a 32F and below LFP bank would be a useful feature. Although this year, I do not let my cabin interior temps fall that low!

[boB]

Hmmmm....  Well, there is a setting to turn off charging when the Batt Temp goes ABOVE a certain temperature
but now below.  Didn't think about Lithiums.  Usually you WANT a cold battery to get warmer, but that would be
for a Lead Acid.

These types of things are reasons for adding a separate micro to fine-tune your control I guess...

boB

[Cniemand]

Usually that is the case, boB :however, LFP cells create little shorts inside the cells when you try to charge them up below freezing. Something to do with how the lithium atoms inter-chelate in the structure.

[Halfcrazy]

Yes this is a feature we need to add to both controllers. (Low temperature limit) on the charging. I have asked Mario to look at adding it when you select lithium on setup on the kid.I will talk to Mario about adding it to the Classic as well.

[Cniemand]

Thank you!

[ClassicCrazy]

Yes this is a feature we need to add to both controllers. (Low temperature limit) on the charging. I have asked Mario to look at adding it when you select lithium on setup on the kid.I will talk to Mario about adding it to the Classic as well.

Thank you Ryan - That would be great !

Larry

[binkino]

and what about output limit dependent on max charge amps of the batteries?

[Halfcrazy]

Actually the Classic JUST last night got Current limit based on WBjr in the code. I will be testing over the next few days to a week and releasing it as Beta

[binkino]

Hi,

some news?


Now I have my Renault Twizy (a small french electric car) and now it would be great, to have a chance to influence (right word?) the output of the Classic.

So I can charge the drive battery a little bit, before I start driving to work.
If sun stands over the house, I have so much energy and can put it in the car.
But in maximum power it can take, this would mean about 50 amps in 48 volt side.

So if the classic must limit the output because the setting, I would lose energy.
(sorry my english is terrible today)
If the classic could meassure the needed energy, it could increase the output, @^# long it is needed.

thanks
Andy

[binkino]

Have now measured the load of the car charger, it sucks 8,2 Amps on AC line (230 V)  ("TRMS" with a "clamps" instrument)
... calculating ... this is on 48 Volts ~ 40 Amps

The Classic is limited at 30 Amps (23 Amps for Battery charging maximum + some Amps for the inverter and my home)

So I need a way I can switch between the setting, if it can not do it automatic  ...

Changing the setting in the MLP, makes no change effect.
I change the max. Amps from 30 to 40, but nothing happens minutes long.
I repeat change the setting, nothing happens. After a long time, some time, it changes.
That is just not a useful option to do the business with it ...

Any suggestions?

[tecnodave]

Binkino,

This has to do with the basic way that a computer works. A computer can do only one thing at a time, just because you change a value in a register does not mean that the program will go off and read that register right now. There is a list of things to do in order of importance to the task at hand. The program may wait some time until it needs to read that register again........

I have noticed this behavior  in my Classic but it does indeed record that value and does within a reasonable time change operation to that value.....it has never been a problem......we can talk and chew gum....a computer can't

Dave

Edited for iPad's spelling attempts!

[tecnodave]

Andy,

Don't know of that electric car, I would think of maybe a solar system dedicated to that purpose.
1 kW is a tad bit small to charge an electric car

Dave

[binkino]

Andy,

Don't know of that electric car, I would think of maybe a solar system dedicated to that purpose.
1 kW is a tad bit small to charge an electric car

Dave

Hi Dave

it is not a really "car" ... it is classified as a "Quad" or "quadbike".
cheap in insurance an very easy to handle.
You can use it as a daily "car"


The charging power is about 1800-1900 Watts
(measured the Amps ... so I have here ...  line: 230V * 8.2A = 1886VA ...
calculating in 48V it is about 40 Amps
(the 48V is system voltage, it is higher while charging and so a bit less Amps, plus the lost in converting the energy, we still don't want to give a notice. viewed over the thumb, it is the needed power)
no problem for my PV, if sun is above the house


My problem still is, that I have to limit the power output in the Classic to 30 Amps because the max. charge Amps for the AGM batteries.
(OPZ are in planing, but are in the future)
There is much more energy I could use.
And build an extra PV ... no, then better charging from grid.


Some days it will be neccessary to recharge a little bit before driving to work, for let's say 30 minutes.
That's enough for a lot extra range.
The Twizy can drive about 80-100 km, and my way is 2 x 38km.
Some days I will have to recharge from grid, some days I want to recharge from PV.
Dependend from weather / sun / ... and how much I have to drive


You can see this fancy car here:
https://www.google.de/search?q=renault+twizy
Renault is still in progress to bring it to the States, labeled as a Nissan:
http://cleantechnica.com/2015/11/02/renault-twizy-comes-to-us-as-nissan-new-mobility-concept/
but limitet to 30 mph Vmax (like the 45km/h Version hiere in Europe, young people can drive - or only need insurance like a scooter)

Has a regular plug ... so you can charge on any wall plug

Andy