Recent content by bertramh

Thanks.

Wendee, Could you shed some loght on how you computed the hydrogen concentration in the room based on EN standard? I have some battery rooms and there is this question that keeps poping up as to weather we need to put hydrogen sensors that activates the exhaust fans.

Folks, I am having trouble finding any information on the internal resistance of the GNB Absolyte IIP's 100A 27 to 33 Batteries, I have looked on their web site but to no avail. I am using the Alber cellcorder with over 3000 batteries testing and need this information to assist in trending analysis.

Gentlemen it's the same findings I had from the start of this thread, the batteries just go bad in batches. Since then I have switched battery manufacture on my two large ups systems. My conclusion is there is some defect with this brand of batteries since the supplier was unable to give me a...

Davemarz the UPS is five years old and it suppose to be monitoring the batteries but the UPS shows one hundred percent capacity but the batteries keeps exploding and I have since removed three strings from the system and it's still showing 100% capacity.

Alehman, What type of testing do you do twice a year.

Alehman, No when the top is blown the battery case is fractured and they are usually hot and swollen. there are batteries as low as 9V. the UPS is manufactured by Powerware. jbhartos, The batteries with the blown top are hot.

I discovered this in a 3KVA UPS last year and in June it happened in two 160KVA UPS operating in a parallel redundant system.

DanDel, No there are no ignition source in the cabinet, it contains 400 batteries and five fuses making up five strings at fourty each. Busbar, with the failure of the battery and the low cells voltage of some the charging current has increased to compensate for this low voltage. Alehman, No...

Hi I am having a problem with some Power brand batteries, they are located in a cabinet supplying UPS feed but they are blowing their covers and this is happening only in UPS with Power battery. Does anyone have an explaination or have the experience of seeing this happen.

Thanks much for all the assistance and guide lines is has been an enlightining one. You know what amazes me, the fact the vendor used his method of determining the good batteries and putting them in service and conducting a load test the 440V instantly disappeared from the fluke. It appeares the...

No the batteries failed while there was a "brown out". The float voltage is calibrated as per spec. and they are C&D Dynasty VRLA batteries. The room temperature is 77deg.F and all other conditions are acceptable, I was told by one vendor that this is a good battery but judging from...

Hi I have a 40KVA ups and it's been three years since installation,the batteries are ten year design but they have failed instantly. The specs. on the are 90AH 12V in a serise combination giving 420VDC. I measured the ripple current and voltage and they are as follows 1.9A ac and 3.9V ac, IS...