off grid solar system recommendation

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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.
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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.
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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.
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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.
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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.
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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.
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