Batteries

I have been looking at the amount of Amps moving in and out of my batts for that last few weeks and one thing I noticed is that on Charge the peak I got was 50a (I assume that was on a cloudy day) and on the draw side 30a max . The question is , if you peak charge is 50 a then should your fuse not be about 60a (+20%) ? and if you use 60a fuse will that put a resistance on the line? I currently have a 150a fuse and it seems a bit big for my consumption. Any thoughts? Regards Paul

Hi Everyone Next question. I think that I understand the Charging side of things. I will write it out as I understand it. Please correct me if I am wrong. I use the Trojan T105. 2 Banks of 8. According to the data sheet from Trojan.com I should 1: Bulk Charge at 59.3Volt (My Infini can only handle 58.4V) 2: Float charge at 54Volt (Infini set to 54V) As for charge rate, I gathered from some other discussions on the forum that the best charge rate is between 10% and 13% of 20H rating of battery. With 2 banks in parallel I am sitting at 450ah so my Max charge rate is limited at 50A. Is this correct and acceptable? As for SOC , I can figure …

Hi All, I am looking for 8 X Trojan T105's for my 5KVA Axpert. Who has the best prices now. I am in Centurion, Pretoria. Also, does anyone know where i can get the HydroLink single-point watering system? I think TTT could at some stage? Thank You,

One of my recent projects, the battery cooler box. The temperature in my garage easily reaches 35°C in summer - on average it is in the lower 30's. According to the T105RE's datasheet, any lead-acid battery should be kept at 25°C or lower and an increase of 10°C halves the expected life of the batteries. Therefor I decided to keep them cool... The box is constructed from 50mm coldroom panels and is attached to a plywood base fitted onto an angle-iron frame with castors. The inside of the box is watertight and coated with stone-chip - the stuff used to coat the chassis of trailers and caravans. The compressor assembly is from an old ice-machine The tempe…

Hi guys dont find this onsite but wanted to know is it worth it to spend R100K for a 48v bank made of 12x2v@900ah Compared to R50k 48v bank made of 16x12v@230ah (920ah) Thanks Sent from my GT-I9500 using Tapatalk

Hey guys, I purchased 4 x 100Ah Lithium batteries about a year ago, and since then I stopped having weekly power cuts. So I purchased them for nothing, as the 4 x 100Ah DC Gel batteries are working just fine. I would end up using the Lithium's at some point ( going off the grid on one phase when electricity prices start getting more steep), so for now I need to know where I can give my batteries a boost charge OR maybe I can just buy one. Can someone please kindly point me in the right direction. TIA !

I have noticed that the first battery on the negative side of the inverter corrodes more than the others. Is this normal?

Hi All Just a post as info. A while ago I went and helped @Manie to install a fuse and isolator on his battery bank, Manie mentioned that he was worried about a high midpoint reading, I disconnected all the batteries (4) and tested them separately. He has a older string, and a more recent string connected in parallel. The voltage of the 2 batteries in the older string were identical, as were the voltage of the 2 batteries in the new string. The combined voltage of the 2 old batteries were lower than the combined voltage of the 2 new batteries, so I thought that would be the reason for the midpoint difference. I forgot that the voltage of the 2 strings, when con…

A 48 volt Li battery is rated at 6.5 Kwh and can be discharged to 80%DOD. This means that it has an effective maximum capacity of 5.2 Kwh or 108AH. It is also rated for 5000 cycles and costs R50K. 8* 200AH (12volt in a 48volt configuration) Gel batteries at 30%DOD gives an effective capacity of 120AH (equiv 5.76 Kwh). They are rated for 3000 cycles and cost R6k each for a total cost of R48K. The cost and capacity of each of these options is almost the same but the cycles for the Li battery are much much better. Is it a no brainer or have I missed something out?

Hi, I wonder if anyone has attempted to install a single BMV 702 on several batteries banks, connected into a larger bank? In this particular setup I'll have 24x 12V batteries in 3 banks. My thinking is that it would be fine, but since the BMV only has one set of wires, I would have to make up another two sets of identical length + thickness ( or, rather, match impedance) as close as possible. BUT, if anyone has done this, did you run into irregular readings?

Hi, I wonder if anyone has attempted to install a single BMV 702 on several batteries banks, connected into a larger bank? In this particular setup I'll have 24x 12V batteries in 3 banks. My thinking is that it would be fine, but since the BMV only has one set of wires, I would have to make up another two sets of identical length + thickness ( or, rather, match impedance) as close as possible. BUT, if anyone has done this, did you run into irregular readings?

A friend of mine has build his own solar system about three years ago. Not getting proper help in this area, he made a couple mistakes while designing his system. His system consists of the following: 2 X Victron Phoenix 3000 watt 12Volt Inverters 2 x Victron 150/80 MPPT (1 with 11 x 140Watt panels and 1 with 11 x 135 watt panels ) 25 x Discover 105Ah batteries paralleled. 2625Ah All here knows this is a total recipe for disaster. He came to me and ask me advice on the batteries as some mornings after the nights usage the battery voltage will be at 12.2- 12.3 volts, and then 1 day in a week it will sit at 10.2V with load and 10.3V without…

I recently acquired my first "blue product" but now I'm scratching my head. She doesn't turn on 4 x 12v 150aH batteries in a 24v config. Volt meter reads 24v at the positive and negative terminals and, the common reads 12v. Wired the meter in exactly the same way (except I only have 4 batteries).

Hi Found my 3 month old BMV 702 like this earlier tonight. Looking at the monitoring software, the unit still seem to work fine. Question 1: Anybody with an Idea what could be the reason and or cause of this? Question 2: Does anyone know of a configuration tool that is available that I can use to program this unit in the future. With the display not working I can not make any changes? Dont want to buy a new one just because the display is shot.

Hi Powerforumites I am looking for Omnipower 260ah Batteries to start building my battery bank. I like that the maintenance free. Any suggestions of? where to get them at a good price?

Has anyone done or is there a link to a cost analysis of batteries available in South Africa based on a Rand/kWh/cycle basis as per this example I found on a European website? Watt it all comes down to.

Now I assume that this has been asked but just for fun Ill ask it again. I was always under the impression that to get the best value for money out of your batteries you must run them at 20% soc. But then I had a chat this morning with someone and it I did some calculations after wards by the look of things you should get better value if you run them at 70% soc per cycle. I used the T105-RE for the calculation and I did a price per khw. So to start here is my formula that I used Battery price / ((V x A x Cycles x(SOC/100)) /1000) = give you the price per kwh ( IS THIS THE CORRECT WAY TO CALCULATE) Below is the Answers that I got. Just for …

Hi everyone I'm in need of replacing my batteries 8x 66Kg so looking for a company that will buy them for the lead. In Gauteng (Jhb/PTA)area, thanks

These are nice 1st Trojan-RE 12 volt with smart carbon tec http://www.trojanbattery.com/product/J200-re/ Im thinking of getting 2 of these to replace my 4 X 100AH strides, problem is it looks like its not available locally yet

As with all of you, I am super keen to find new battery tech that works and is feasible... Has anybody here got experience with these guys? http://bluenova.co.za/residential-products.html From the pricelists I get: BN52V-144-7.4kHC R 72 080 (that's a 52V bank @144ah, 7.4kwh usable) guarantee of something like 10 years at this level of use. This compares to about 450ah LA batteries roughly around R30-40 000. If they do last at least twice longer it could start to look worth it...? What i also want to know - the settings needed on your MPPT are as below (if i look at it the Axpert SCC should work!?) - what you guys think? if one can use one's existing c…

A Random question... Seeing that just about every thing around here is about batts , I though someone might have a contact somewhere: I am looking for replacement batts for my Cordless Makita drills. I know you can repack them and I have even opened them up to check but I can really find suppliers for the sells. Regards Paul

Howdy ladies and gents! Are there any 48v li-ion battery chargers available in S.A? Can't seem to find any, my google-fu is weak! I want to convert a lead acid driven golf cart to li-ion. Less weight + same capacity = better range

Hozid guys I know this was definitely asked somewhere but I cant find it. I am slowly getting my system running smoothly and everybody is just about trained. The last three weeks or so my batts has not gone below 87% soc and I read somewhere that it might not be a good thing , something to do with only the "top" part of the plates working and they can calcify or something. Should I discharge the batts deeper from time to time and if so how deep and how often?

https://www.victronenergy.com/batteries/peak-power-pack I really want to know what this is going to cost. I use 5X35Ah Lead crystals in my portable power system that i charge up with a panel or a BP-IP22 charger. its an awesome little mobile generator but it is blooming heavy. Something like this might just work for me, or maybe i'm just a blue fan.

HI guys Here is another one for you that like to fiddle with the data. Is there a way to change the 702 cycle count from 50 to 80%? I have looked around but I can find to much info on the matter. Regards Paul