off grid solar system recommendation

New to renewable energy? Have questions? Here's a great place to ask them and view information about wind and solar power basics.

Re: off grid solar system recommendation

Postby angusjones8 » Tue Feb 07, 2017 8:47 pm

Got onto EV works and bought 16x BMS-CBM400 balancers, BCU-RAPS-16c battery control unit and a CHG-A-16C25A charger.
Think all I need now is a decent fuse disconnect and some cable.


What sort of baseline settings should I start with on the FM80?

I also rang Latronics about increasing the LVD and they said it's a bit of a major, he said it can be done but it will raise the HVD (I think) by 3 volts.

Should start putting things together in a week or 2.
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Re: off grid solar system recommendation

Postby Gordon-Loomberah » Tue Feb 07, 2017 9:01 pm

I had mine modded before it left the factory, to 49V, although the only time it has been activated, from memory I think it was a bit under 48V.
I'd suggest Vabsorb of 55V, and Vfloat 53.5V, and you'll need to work out your absorb time by watching net charging current, and it will depend on how fully charged you want to take the battery.
If you need to get the battery charged faster, then a higher Vabsorb will work better, but I wouldn't go over 56V for an extended period, particularly in summer.

Use a good quality multimeter to check your voltage set points, don't rely on the FM80's display.
http://gunagulla.com Loomberah weather and astronomy including live solar radiation intensity and UV + Gunagulla aquaponics, organic eggs and cherries
User avatar
Gordon-Loomberah
Community Moderator
 
Posts: 5431
Joined: Thu Sep 24, 2009 9:41 pm
Location: Loomberah NSW Australia

Re: off grid solar system recommendation

Postby angusjones8 » Wed Feb 08, 2017 7:54 pm

Thanks heaps for that.
I want to be kind to the batteries so I'll keep on the safe side.
I got a new fluke multimeter coming, my old $9 is on its last legs.
Sounds like a few weeks of monitoring is in order which sound like fun.
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Re: off grid solar system recommendation

Postby angusjones8 » Mon May 22, 2017 12:53 pm

Well I'm all up and running!
I only have 3.2kw of panels wired up so far and it's plenty enough.
I find I'm drawing the battery down more than I would have liked over night but it seems to be only charging up to 53.2v every day so this could be an issue I need to look at.
During the day I have more power than I know what to do with and I still have 6 more panels to wire up, I think I'll put them on the western side of the roof for some afternoon sun.
I'd like to tidy up the DC side of the wiring a bit but that can wait.
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Re: off grid solar system recommendation

Postby Gordon-Loomberah » Mon May 22, 2017 1:03 pm

angusjones8 wrote:...it seems to be only charging up to 53.2v every day so this could be an issue I need to look at.


Absorb voltage set too low? You wont get near fully charged at that voltage at this time of year- the days are not long enough.
http://gunagulla.com Loomberah weather and astronomy including live solar radiation intensity and UV + Gunagulla aquaponics, organic eggs and cherries
User avatar
Gordon-Loomberah
Community Moderator
 
Posts: 5431
Joined: Thu Sep 24, 2009 9:41 pm
Location: Loomberah NSW Australia

Re: off grid solar system recommendation

Postby angusjones8 » Mon May 22, 2017 5:24 pm

My absorb voltage is 55v I think and the BMS says 100%.
I'll do a bit more research on the bms side.
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Re: off grid solar system recommendation

Postby angusjones8 » Sat Aug 26, 2017 1:03 pm

Just an update. Have been living with my system for 4 months and everything is going great. We use more power now than when we were on the grid and I'm loving every minute of it!
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Re: off grid solar system recommendation

Postby Gordon-Loomberah » Sat Aug 26, 2017 2:00 pm

Good news :)

Did you put the extra panels on the W roof?
http://gunagulla.com Loomberah weather and astronomy including live solar radiation intensity and UV + Gunagulla aquaponics, organic eggs and cherries
User avatar
Gordon-Loomberah
Community Moderator
 
Posts: 5431
Joined: Thu Sep 24, 2009 9:41 pm
Location: Loomberah NSW Australia

Re: off grid solar system recommendation

Postby angusjones8 » Wed Sep 13, 2017 12:28 pm

Yeh I did so now have 18. Prob don't need them but got sick if tripping over them!
Thank you so much for all your help!
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Re: off grid solar system recommendation

Postby angusjones8 » Wed Sep 13, 2017 12:31 pm

Just read it properly. I ended up putting 3 panels on the western side of the roof, we use a bit of power in the arvo cooking tea ect so it probably helps a little.
It's amazing how little light is required to start making power in the mornings and on overcast days. We had a long weekend where it rained for 4 days and we were fine.
angusjones8
Solar Supporter
Solar Supporter
 
Posts: 16
Joined: Tue Nov 29, 2016 8:52 pm

Previous

Return to Q&A - wind and solar power basics

Who is online

Users browsing this forum: No registered users and 2 guests

new solar power specials