my cheapo off grid system
Collapse
X
-
-
the only money i need to spend that i can think of right now is 8 x terminal lugs $40 and maybe a 100amp fuse for the +ve inverter lead. that should be safe enoughComment
-
Batteries in parallel, each should be fused, so if 1 goes bad, the rest of the bank doesn't dump it's power into the bad one
Standard fuses are not made to handle mega amp interruptions, you need high quality fuses like these from BLUE SEAS
Easily and economically satisfies ABYC 7 circuit protection rule by mounting on a 3/8 battery post, battery switch or bus bar.
Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
-
Smoke on the water. I would not be showing this to anyone if I were you. It could be used against you in court if a fire starts. If you insurance carrier knew about it they would not pay you a penny.MSEE, PEComment
-
fixed the lugs straight away, but now have some thoughts about fusing. i have these batteries in series pairs , the pairs are then paralled so need to think about where to place the fuses. should the inverter cable be fused? actually this has convinced me to build a weatherproof box and place this battery bank and inverter / charge controllers outside near the fence with the panels. then i wont worry about fuses, doesnt matter if it goes bang near the fence. i will save some power losses that i currently get running 32v dc through 10meters of 25 amp cable. can cut that down to 2 meters. run 240v ac from the panels to the house DSCN0007.JPG
Comment
-
Unbelievable.
Why don't we start at the very beginning again ... don't know why I didn't spot the white-elephant sooner:
MOW YOUR LAWN.
Or at least elevate those panels above the shadows from the grass!
Now, throw out everything but ONE battery and have a re-think.
Comment
-
Comment
-
Because he believes he can achieve FREE power.
The quest to achieve this so call FREE power may come at the cost of him losing his eyesight or having major burns if one of those batteries blows up while hes leaning over it checking the SG.
With the poor quality terminals and wiring and so many miss matched batteries there is a good chance of a spark from some where, even the inverter or CC may do it, I dont think they are exactly quality items.
Comment
-
i have achieved free power bala, these car batteries are free and in unlimited supply. and safety is an issue i am taking seriously, the terminals have been fixed. i am moving the system outside and away from the house. pnjunction that pic with long grass was taken 6mnths agoComment
-
dont want the expense of fusing so moved the system outside DSCN0015.JPG
DSCN0012.JPG
made 6 pairs of 12v batteries in series for 6 x 24v paralled with equal length cable to 2 terminals for charge controller and inverter. so now if it burns no harm doneComment
-
dont want the expense of fusing so moved the system outside [ATTACH=CONFIG]n300036[/ATTACH]
[ATTACH=CONFIG]n300037[/ATTACH]
made 6 pairs of 12v batteries in series for 6 x 24v paralled with equal length cable to 2 terminals for charge controller and inverter. so now if it burns no harm done
So think about at least to install the proper fusing, terminations and safety interlocks to make your system less of a hazard.Comment
-
ok thanks ,i now understand that each pair of series 12v batteries paralled, (there are 6 x 24v in parallel) need their own isolation fuse. also from reading elsewhere the inverter needs to be fused. the terminals are ok now. what is a safety interlock? also this thread is 8 months old and until now no one told me to fuse my system. i will post some pics of my wiring later. this is the wiring Scan0005.jpgComment
-
here are the pics of the wiring including the bus bar. the cables to the bus bar are 25amp. i figured this would be enough since max load is 2000w at 24v about 85amps or 160amps surge. divided by 6 is about 14amps max constant. so 30amp isolation fuses for the 6 x parallel batteries? the total reserve capacity rating for these car batteries is 800 RC , multiplied by 0.42 gives 330 AH. after i have tested the 6 x 30amps fuses for the 6 parallel batteries i will add another 4 sets of parallel batteries bringing the total to 20 car batteries giving approx 500 AH DSCN0383.JPG
Comment
-
have fused the 6 groups of parallel batteries with 50 amp fuses. but now my lights a pulsing? why is this? would an earth lead from the inverter to a star stake in the ground suffice as an AC earth? DSCN0422.JPG
Last edited by almac; 01-21-2016, 03:07 AM.Comment
-
so backup inverter dead, 12v system now only have a 12v 600w modified inverter left. this one runs the fridge strangely enough. DSCN0430.JPGComment
Comment