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New Powerwall in Romania
#21
Welcome. Note that you need a decent size battery to start. To mnay start with to small battery and Wear Them out. Pip 5kw need atleast 14s120p to cope with the load properly. Ie design wise.
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#22
The stats on the panels

(Pmax) : 280W
(Vmp): 31.83 V
(Imp): 8.76 A
(Voc): 38.85 V
(Isc): 9.33 A
60 cells (6 * 10) polycristaline



(01-17-2020, 11:45 AM)Korishan Wrote:
(01-17-2020, 07:12 AM)cat23 Wrote: I have two questions
1. The panels - I have in mind some 280W panels, but i am unsure about this max 80V MPPT - 105V max PV input. Sould I go with 2 panels in series or 3 (38,85V open circuit, 31,814 Vmp).
2. BMS - i want to use the Batrium, in the first months i'd rather not spend 500-600 eur on it. The packs are matched quite well, buit in 2018, harged, let to rest. After one year, the voltages are in .07 V range of each other. Is advisable to use them without Batrium this summer?

Welcome back

1) What are the other stats on the panels?
2) That's really nice to only have that small of a drift. At least you know you don't have any self dischargers. I would still recommend a BMS of some sort, even if a cheap one. But at least monitor voltages on a daily basis. Perhaps use those led volt meters on each pack to make that easier.
It's one thing for them to not drift while resting and back/forth current flow. It's another to start moving current around. You're making them work now so they may drift a little more.


So Batrium it is Big Grin

(01-17-2020, 12:18 PM)daromer Wrote: Welcome. Note that you need a decent size battery to start. To mnay start with to small battery and Wear Them out. Pip 5kw need atleast 14s120p to cope with the load properly. Ie design wise.


I have those packs already built, but i have cells for another 14-15 60p packs, too busy (lazy) to  assemble them. Probably the second set will be 80p and used in parallel with the first one.
I want to use AZ_tekkie s 3d printed mounts, so it is very flexible in this matter.
https://www.thingiverse.com/thing:2572115


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