andrew9484

Item: @ Bluenova Batteries. One 8k one 16k Age: 6 years Price: R1,300.00 per KWH Payment Method Accepted: Cash, EFT Warranty: N/A Packaging: N/A Condition: Good. One owner. Usually not below 50% SOC Location: Port Elizabeth Reason: Could not get same spec units to extend current pack capacity so replacing entire system. Best suited to someone with Bn battery wanting to extend, Shipping: Buyer to arrange at own cost Collection: Port Elizabeth Link:

PE

Hi. Does anyone have Axpert inverter settings for BlueNova Lithium battery? I have 2 Axperts and a 52V Cell. I am having a problem with battery kicking off due to voltage too high. This is when the battery is around 97% and 54V. Inverters, BVM, BlueNova all showing same voltage +-0.2v.

I have 6 x New (2 month old) OPZV2-490 2V Cells for sale. Also available: 19 x second hand (24 months old) OPZV2-490 Rack for 24 x OPZV2-490 and connecting bars etc. Make me an offer. Andrew 082655549 / [email protected]

i already have a BMV712 so that is not an issue

what i like is the fact that they are local. in my mind this will help for support and also warranty repair transport costs (should it be necessary)

Hi All, interested to hear your experience if you are using Bluenova Lithium cells (especially if you have used for considerable time). I have had bad experiences with AGM cells and then VRLA cells. i am considering going to Bluenova in the hopes that it will be a reliable solution for a long time. Any comments would be appreciated.

thank you all for your feedback!

Hi, I am mostly off grid (or at least should be). At the moment i have 490AH @ 48V. I started with AGM cells. They failed after a year and then decided to change to VRLA's. The specs of the VRLA's indicated that for my usage i could expect 16 years. I did not expect 16 years but did expect them to last a few years. After a year I already started getting failures. The supplier does not seem to be interested despite all of the information I gave them. I am considering going Lithium and i wanted to ask others about their experiences with Lithium? I have spent a lot on batteries and i dont want to spend more and end up in same situation in a years time. if you are using Lithium; how is your experience and how long have you been running on them? Will they be the final solution to my problems?

I have Ritar OPZv2-490's. Based on my use and the specifications they should last 16 years. I have had failures after a year. So far i have replaced 5 cells.

Hi Pilotfish, thanks for the detailed breakdown. I am not keen on having parallel strings again. The OPz look good apart from the price. I was wondering about the Trojan L16 435AH. Would work out to approx 45k based on online prices. The mantech price on OPz is ex VAT from what i could see.... so would be looking at R73k

Great - thank you

Thanks Chris. Any luck with price on Trojans? I was looking at the OPzV2 as well but after some online price calculations it looks like it will be significantly more expensive option. probably better to go for the cheaper option now and then hopefully prices will drop and specs will improve by time i need to replace.

I see in your image that you have used bars to connect batteries. Did you buy these or have them manufactured?

Hi. Thank you for the detailed response! I am using system in very similar way - also 1 day autonomy. And all off grid excluding Geysar, oven. Pool pump is on but i usually change over to mains if cloudy. At the moment I am considering the batteries that you are using and Trojans. what are your thoughts between the 2 options?

Hi. How are your batteries going - still all ok? Are you using as off grid system?

Hi. thank you fro the response. Yes - 75% SOC

Hi. Thank you for the feedback. Batteries are usually fully chargedby 12h30 so still another 3-4 hours of production. Well below max charge rate of batteries. I will look into the issue you mentioned using axpert to switch. Any thoughts on OPZV2-490 that were also mentioned on this forum?

Hello, I have a system consisting of 16 x 320W panels; 16 x 100AH Vision batteries (data sheet attached) and 2 x 5000VA Axpert inverters. I also have a victron battery monitor. I know that the 4 strings of batteries is not ideal - it is result of upgrades. My system has been running since Feb 2017. I am 'close' to running off-grid. I have not been having a good experience with the batteries. I replaced 3 of them a few months ago. I have now had to exchange another 4. Not a good record! And the results are still not desirable (battery monitor still showing up to 2% deviation at times). I only discharge to about 75% on most days. I set the charge current to a max of 10A per string. It is only a matter of time before i have more problems. the agent feels that the battery issues are as result of the charge current being too low. The newly replaced batteries will only carry warranty from the original purchase date; meaning i will have to look at replacing all in 6 months at this rate of failure. 1) My expectation was that the lower the charge current the longer the batteries would last. Is my thinking flawed? Maybe high current is needed for some chemical process. Should i set charge current to max? 2) Should i give in now while i have 4 brand new batteries to sell off? and then replace? If so; what battery technology should i change to considering my configuration and intended use to be off grid? Many Thanks Andrew 6FM100-X.pdf

great! thank you

Thank you all! Next question... i would like the pump to only run when sun is shining strong (so it will not drain batteries). I have searched for some type of controller that works on light intensity but found nothing. any other ideas?

Sorry for late response... no this is single phase

Hi, I would like to put my standard pool pump onto my 2x 5kva Axperts in parallel. The documentation states that the Axpert can operate appliances with motors but i don't see any detailed specifications. The pump will run during the day so on most days should run directly from solar panels. Has anyone done this yet? if not do you foresee any problem?

Ok. that is not a good sign! I informed the supplier and they say I can take them back and they will test. So hopefully they will replace them (although it may seem they are fine when tested separately. I will be away few a few weeks but will take them in once i am back and send you an update.

I did as per your suggestion. Midpoint now mostly between 0.2 and 0.5% but i have not tested at significant discharge yet. I have vision 6FM100-X batteries