Great comprehensive answer from Larry, with all the reasons why. My thought also, "you can use a bigger battery for the regulation circuitry that is looking to manage a much smaller amps". Power regulating transistors don't like that. Buy APC brand UPS for the specs you need. My place had one the size of a large suitcase., keeps everything, servers, communications and security, running for an hour, but backup generators normally kick in within 5 seconds. UPS smooths the power.
Larry Ng Aug 19, 2021
UPS are not the same in all countries due to rules on AC power,
this is a very old UPS, and is tiny 600va , home type, or for POS point of sale terminals (as seen at taco bell?)
well you modified, the UPS did'nt you. called HACKING
and when you to that , it confused the UPS charger (vastly) and the inverter too. or is this normal (it is)
200vac is in spec, did you RTM read your manual, (USP spec) not your needs or you GEAR needs (loads)
why do that?
if you need longer run times you buy a UPS that does allow external battery banks of many sizes.
and when you to it must be configured first so it can function with larger battery banks.
this 600 AVR uses 12vdc 7 or 9AH, amp hour battery only, period. (common used in emerg. lighting)too.
when you remove the internal battery and then jury rig in (hack) any external battery
that does 2 things
huge increases of AH it can not deal with (many not) AH is good , more is good but is it allowed,?
and changes the batteries internal resistance, huge. and confuses it all.
or the UPS needs service (seem not)
why not first put the UPS back as it came new with the correct new battery see if it works now.
if yes you learned not to hack UPS.
the manual is terse. (ours not 230vac but your has same error spec !)
the manual shows regulator is CRUDE on this cheap UPS (a toy grade for sure)
math, 230 -15% is 195vac. (so 200vac is in SPEC)
did you read your manual page 11
i will try to find the African manual version but can be hard for me 10,000 miles away.. and failed me.
I did see a data sheet and is same %
maker claims EOL end of life and no support. (too old)
you need to upgrade the UPS (newer UPS are far batter ) like APC brand,
some brand can do , output Regulation to +-5% and have sine wave out far better.
business grade are best.
also some UPS models have strap inside for 200, 220,230,240vac outputs for more country support
or your UPS is the wrong UPS for your country, all the maker and ask? MGE
where did you buy this UPS, from Canada.
south africa is 230vac and 50Hz so make sure yours is both,
here is one that does, 3 outputs and 5% reg +/-
UPS as a product are complex on the world stage and by features and regulation of output.
for sure sinewave UPS, that lots more things, and noise on the output lines on some are horrible
the above does 50Hz too and is top grade.
if you expect cheap made , home USP to have tight output regulation that will not happen.
wrong UPS for country
hacking battery is not authorized nor expected to work
battery is bad.
ups charger or inverter inside is bad.
or expecting, home UPS to work like good commercial/business is not going to happen.
top FEATURES are vast , here is my short list
watts (VA rating)
voltage in and out., and Hz.
cords/plug matching your countries wall jack, vast.
internal or external batteries, even huge banks of batteries.
line out regulation, 5% possible if have the cash to buy top grade.
Sine wave out not cheap chopper class inverter seen on cheap home UPS that make huge noise on the line.
brown out protection , input voltage can go real low and UPS works no problem.
Power surge protection
and RUN time (see battery options)
use industry standard batters not soom ODD BALL batteries only THEY sell. and costs huge.
rack mount or floor mounts.
efficiency ratings,. Green + low carbon foot prints (less)
to buy a UPS< tell what your loads are, first and ask for recommendations.
some things have no trouble at all at 200vac (230 country) nothing told yet. by you.
here in USA 120vac 60Hz, we have some gear that runs down to 90vac ok,
that be near 180vac there, but no needs stated,
my guess 1 PC?
you posted a UPS to COMPUTERS so I guess is used for 1 PC.?