Hi
On APC model Sc620 I have a 30A automotive fuse inside. Right were the leads from the battery or batteries connect to the logic board. Once, when I replaced the batteries that fuse failed. At initial connection of the battery pack you could get a quite high momentarily current spike and that's what killed my fuse. I replaced and no problems.
Check if you have one inside the unit.
Alex.
Alex.
-------- Original message --------
From: manuel wolfshant via Nut-upsuser <[email protected]>
Date: Wed, Feb 8, 2023, 03:05
To: nut-upsuser Mailing List <[email protected]>
Subject: Re: [Nut-upsuser] Question about Tripp-Lite UPS life span
On 2/7/23 14:28, Larry Fahnoe via Nut-upsuser wrote:
> Thanks Greg & Wolfy for your encouraging replies!
>
> I did check the momentary power switch yesterday and it is working properly; a good thread to read through though.
>
> Will pull it apart again today & put the old batteries back in--sometimes I just need that extra set of eyes on the puzzle so as not to overlook a good test. Can certainly verify polarity but I don't think I have anything on hand to do a load test. If the UPS wakes up with the old batteries then the new ones go back & I'll lean on the store for a load test. I'm guilty of not questioning my assumption that the new batteries were good!
I'd say that expecting "new" ( as in recently purchased ) products to be
in perfect shape ( unless ebay or made from chinesium, that is ) is a
fair assumption. Practice teaches us that not all fair assumptions are
also true :)
Now, in the event that the UPS will refuse to come up even with the old
batteries, I suggest a careful inspection of the electronic board, of
the cables and especially of capacitors and places where the cables are
soldered. Capacitors DO age with time and a bad connection ( maybe a
cable just got loose ) may prevent proper functioning.
wolfy
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