Hi If you are headed into a “cost is no object” sort of battery backup bank for the lab / shelter / cave there are some interesting options out there. The RV world is very slowly waking up to the fact that big heavy lead acid batteries may not be ideal. For a ghastly amount of money, you can now get 12V 100AH “drop in” (no they are not drop in) Lithiums with fully integrated BMS systems in them. They *appear* to be safe and come with cute things like 10 year warranties . Be aware that you can buy a nice 5065 on eBay for what a couple of them will set you back …..
In return for your massive cash outlay, you get a battery that does not outgas or have the need to be watered along with the plants. It has a much flatter discharge voltage curve than a lead acid. Their peak current vs voltage generally is better than a lead acid. The BMS may impact this if it is an issue in your setup. They also is a *lot* lighter / smaller for the same amount of useful capacity. The built in BMS *should* take care of all of the fiddly little issues that might burn the house down. Lots to like other than the absolutely giant hole in the wallet …. Bob > On Mar 8, 2019, at 6:43 AM, ew via time-nuts <[email protected]> wrote: > > For my frequency stand alone setup opposite the rest of the lab I have a 100 > A 12V AGM/Inverter/Resonsnt Transformer that will power the setup for 10 > hours, but like you I like remove the HP 5065A powered up. Did consider a > similar system for the HP 5061B but have not and most likely will not touch > it.I am concerned about fire but I have more than 10 in one form or the other > Li Ion batteries in the house. The Battery is inside the frame that comes > with the unit. Starting with a quality product, slow charging and dual max > voltage control and dual low voltage shut out risk is very low. Changing the > Zener in the 65 reduces the output from 33V to 29.5V. The 65 cut out of 21.5V > is perfect for 7 batteries. Charging will be close to C/20. Most problems > out there seem to be do to over charge and temperature rise. Multiple tests > will be done with the pack outside the unit to allow close monitoring.The > main reason for my posting is the pile of junk batteries and finding a > reliable source.in the US. > Bert Kehren > In a message dated 3/7/2019 8:24:09 PM Eastern Standard Time, [email protected] > writes: > > Bert, > > I'm interested in your quest. > > I'm interested in batteries for not only the 5065A but also the 5061A and B. > I was thinking of an SLA for the 5061's. I like the idea of being able to > move the units without having to also move a separate battery backup system > simultaneously. > > What have you come up with and how have you addressed the potential for > catastrophic failure of a Lithium Ion battery? > > Hope all is well. > > Joe > > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of ew via > time-nuts > Sent: Thursday, March 07, 2019 3:37 PM > To: [email protected] > Cc: ew > Subject: [time-nuts] Li Ion Battery for HP 5065A > > > > Having recently acquired a HP 5065A with clock I decided to put a battery in > it. My choice is 5000 mA Lithium Ion. Having in the past very good experience > with a Florida vendor, was first choice. Sadly he is going out of business. > 90+% out there is junk, have 26650s with 1800 mA. Last week finally located a > reliable vendor, purchased seven 21700 Samsung B50s, reasonable price. 21700 > is a better fit in the 50 X 65 X175 mm battery frame. After extensive dialog > with vapah.inc and bench tests of all seven 4800 to 5200 mA, I am convinced > that I found in the US a very viable source. No commercial or any other > interest, now my only problem is how to get rid of the other junk. > > > Bert Kehren > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
