September 18, 20187 yr Question: 24v system Biggest amps panels I can get. Smallest battery bank possible. Grid tied. Make sense?
September 18, 20187 yr 8 minutes ago, The Terrible Triplett said: Smallest battery bank possible. Lead acid or LFP? 8 minutes ago, The Terrible Triplett said: Grid tied. You mean hybrid, right? Otherwise "batteries" makes no sense :-) Smallest Victron LFP battery around 60Ah, can charge at 2C, or 120Amps. So largest array size would be 120*26 (nominal) ~= 3kw. Remains best to design safety into it than to rely on a software limiter. For lead acid my feeling remains at least 200Ah batteries and no more than 2kwp of PV. That leaves you with a 40% (of Ah capacity) recharge rate sans any software limiters, which is a tad above the limit but probably safe enough (with temperature sensors and placed outside the house). Scale as appropriate. Edited September 18, 20187 yr by plonkster
September 18, 20187 yr 11 minutes ago, plonkster said: hybrid, right Damn, yes, my mistake. Hybrid. Jip, I am with you. 2.4kw would be my largest on 225ah lead acid bank. I have a spare controller ... just waiting for panels. ;-) But data first. Am interested in Erastus view on 350w panels on a hybrid system with small battery bank on a MPPT.
September 18, 20187 yr Author @ Erastus Have you received permission to be a net producer? In Mossel Bay your are not allowed to be a net producer of electricity so you cannot use the grid as a battery. Also, they seem to be quite strict on the 3.5 kVA maximum size for domestic installations.
September 27, 20187 yr On 2018/09/18 at 6:12 AM, Erastus said: Simple a bigger than normal lawnmower engine from Talisman +/- R3000 a second hand 100amp alternator from scrap yard. a pulley or 2 an you have a nice 5Kwatt generator. P = I X E 50V X 100A = 5000W hi there always loved this idea but where's the 50 v come from what mods do you do cheers
September 27, 20187 yr 1 hour ago, maxomill said: always loved this idea but where's the 50 v come from Close voltage to 48V and makes the math easier I assume :-) For LFP batteries its pretty common to do math using 50V because they spend most of their life above 50V.
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