BenBB

Hi Guys Proves my point from all the above replies. Sintech sell batteries not suitable for the application. They give wrong advice to make a sale and then not willing to honour warranty when batteries fail even after looking after them. Batteries are meant to store energy and release it according to a spec sheet. What is the point of a battery data sheet if you cannot use as battery according to its spec. Useless.. You say 14.7v to high.. well its printed in bold on the side of OPR60 batteries. Charge at 8A; 10A recomended. 14.3 to 14.7v cyclic use and 13.8v standby... BUT this differ from the data sheet! Charge at 14.1v.. CC... I sacrificed a dead OPR60 battery and cut it open... I was surprised. The plates were pristine.. no damage to the lead grid; Pos and Neg plates; inner membranes were still white and shows no deterioration. I went one step further took some dead batteries and topped somenwith distilled water and some with VERY mild sulfuric acid mix.. have some 99.8% acid. Made some 5% mix. Topped some up with that mix I also drilled some batteries and put screws in the plate connectors.. this way I could access all 6 cells individually. I also charged them individually to 2.35v.. I went as far as buying a variable load/battery load tester from Amazon. It ended up that after my above techniques I revived a dead AGM capable of delivering less than 1Ah to 5Ah.. surprisingly these "revived" batteries can deliver extremely high constant current for shorter periods like 20A.. @12v stable. And then suddenly deplete. This correlates to the renewed state of 5Ah compared to the pre dead state of 1Ah.. However NOTHING I did so far could revive a dead AGM back to 60Ah !!!! I'm trying to get my mind around what happens to the battery chemically when it dies. And why even after "replenishing" electrolite does it still not accept charge even if physically there is no damage to the cells. And none dead.. it tells me that something is amiss with the chemicals inside the battery. I would like to know where Omnipower batteries are made and what their QC is like. They look expensive but is it really AGM?? Or mabe cheaper membranes being used or even the pyrogenic silica mix... OmniPower-OPR60-Datasheet-1.pdf

Good for you that they honored that; but there you go Omnipower 240Ah failing after 2 years !! Supposed to have lasted 10years... so be ready to replace them again in 2 years.. they will fail again..

Yes agree.. Omnipower batteries are crappy to say the least and Sintech is not a company I will ever use again. Poor service; bad response warranty avoiders and that from the CEO!! And they are making bags of money selling loadshedding systems by the dozens and not carring about the projects failing because of poor quality batteries!

I thought I would add this to the forum as people are being mislead and no one is doing anything about it. I'm an electronic engineer and have 30+ years experience in electronic design of many types. Specializing in microcontrollers mixed with analogue designs and the like. From concept to final product. A couple of years ago I did a solar camera installation for a farmer in Limpopo. Long story short; I used Royal 45Ah and 65Ah lead acids as the battery of choice. Then after 2 years they started failing. They couldn't hold current anymore. The solar is only 140w 7.7A 18v panels. My charger is a self designed circuit based on the LT3790. Capable of delivering all 7.7A of current at 14.7v. I then went to sintech in 2020 (will NEVER use them again) and bought 9 new batteries; they analyzed my design and recommended Omnipower 60Ah 12v Agm/VLR batteries. So I bought them. 6months later they started to fail. Could not even deliver 20Ah (or 1.5A for 14Hrs) I took some back and they accused me of exposing the batteries to high temperatures of 45degrees... WHAT! I took the OPR60 data sheet and showed them that at a constant temp of 60degees C they say the battery must last 2years.. at 25 degrees at leat 10 years!! They therefore did not want to honor the warrentee.. I also bought x2 100Ahr batteries and installed that in my garage on a 1500KVA UPS. At a constant temp of around 25degrees in a 19inch rack. They too are now starting to fail. 1 year down the line; Being charged by the UPS and doubled with solar. There is a fundimental issue with omnipower batteries. And I think I know what the issue is. Nothing to do with Temperature but all to do with charge current!! But Sinetech refused to honor the warranty; even when they advised me on the batteries and now DENY EVERYTHING flat out. They never knew my application.. really.. I'm in the process of making a consumer goods council case against them. I bought temperature loggers and logging battery temperatures. I also cut some batteries open to see if the batteries are dried out as this is the tell tale of high heat.. I'm also buying a battery analyzer to test the batteries I believe there is a fundamental flaw in these batteries and if NOT charged in lab conditions will deteriorate Very quickly!! So be warned. Omnipower batteries are NOT worth it. Communica also buys them from sintech and I bough one from communica which also started to fail. I will post my results of the tests as I go along. Even trying some desulfication techniques on the dead batteries NOW 1year old